Greater Sydney in December 2020: a wet month

December was a wet month for Greater Sydney with a large number of rain days. Maximum temperatures were below average except near the coast, while minimum temperatures were close to average.

Rainfall above average

  • Rainfall was above average in most parts of Greater Sydney.
  • It was particularly wet on the Central Coast and some northern suburbs, with rainfall in these areas more than double the December average.
  • Near-average December rainfall occurred in some southern and south-western suburbs.
  • The number of days with rain was significantly above average, especially in western Sydney. Richmond had 20 days with rain, about double the December average and the second-highest on record for December after 2007.
  • Rain was especially frequent in the second half of the month, falling on most days at the majority of sites from the 14th onwards, except between the 23rd and 25th.
  • St. Ives (Richmond Avenue) had its highest December daily rainfall on record
  • Some sites on the Central Coast had their highest total December rainfall on record
  • Some sites had their highest total December rainfall for at least 20 years

Cool days in western Sydney

  • Maximum temperatures were well below average at most locations in western Sydney, where it was the coolest December since 2011, and the Blue Mountains, although they were near average at some coastal sites.
  • Minimum temperatures were near average throughout Greater Sydney.

Sydney (Observatory Hill)

  • Total rainfall for Sydney (Observatory Hill) was 119.0 mm, 55% above the average at the former Observatory Hill site.
  • The mean daily maximum temperature for Sydney (Observatory Hill) was 26.1 °C, 0.9 °C above the average at the former Observatory Hill site.
  • The warmest day was 30.8 °C on the 7th, and the coolest day was on the 19th when the temperature reached 19.6 °C.
  • The mean daily minimum temperature for Sydney (Observatory Hill) was 18.1 °C, 0.5 °C above the average at the former Observatory Hill site.
  • The coldest morning was 14.4 °C on the 9th, and the warmest morning was on the 18th when the minimum temperature was 22.2 °C.

Severe thunderstorms early in the month

  • Severe thunderstorms affected Greater Sydney on the 1st, with power outages and some tree damage in high winds. A gust of 106 km/h was reported at Richmond.
  • Heavy rain fell in parts of the Northern Beaches area on the 30th, with localised flash flooding.

Further information

Media
(03) 9669 4057

Extremes in December 2020
Hottest day 38.5 °C at Penrith Lakes AWS on the 1st
Warmest days on average 28.0 °C at Penrith Lakes AWS
Coolest days on average 20.5 °C at Katoomba (Farnells Rd)
Coldest day 13.9 °C at Katoomba (Farnells Rd) on the 11th
Coldest night 5.0 °C at Mount Boyce AWS on the 8th
Coolest nights on average 10.6 °C at Katoomba (Farnells Rd)
Warmest nights on average 18.7 °C at Norah Head AWS
18.7 °C at Sydney Harbour (Wedding Cake West)
Warmest night 22.9 °C at Sydney Airport AMO on the 18th
Warmest on average overall 22.4 °C at Penrith Lakes AWS
Coolest on average overall 15.2 °C at Katoomba (Farnells Rd)
Wettest overall 255.0 mm at Wyong (Mount Elliot)
Wettest day 105.0 mm at Terrey Hills AWS on the 30th
Strongest wind gust 106 km/h at Richmond RAAF on the 1st

Record highest December daily rainfall
New record
(mm)
Old
record
Years of
record
St Ives (Richmond Avenue) 73.0 on the 30th 70.2 on the 11th in 2002 23



Record highest December total rainfall
New record
(mm)
Old
record
Years of
record
Average for
December
Norah Head AWS 172.8 133.8 in 2007 26 69.4
Wyong (Mount Elliot) 255.0 215.0 in 2007 21 89.4
Wyong (Kulnura (Jeavons)) 188.0 175.0 in 2007 20 88.8

Highest December total rainfall for at least 20 years
Observed
(mm)
Most recent
higher
Average for
December
Mona Vale Golf Club 176.4 251.7 in 1970* 71.4
Collaroy (Long Reef Golf Club) 121.1 210.8 in 1970* 69.7
Belrose (Evelyn Place) 219.4 221.8 in 1992 93.3
Colo Heights (Mountain Pines) 189.4 207.4 in 1992 94.0
Faulconbridge (St Georges Crescent) 185.8 235.1 in 1992* 99.2
Springwood (Valley Heights) 210.8 302.2 in 1991* 101.8
Avalon Beach (Avalon (Palmgrove Rd)) 188.6 212.2 in 1992* 89.5

* note: there are gaps in the historical record at this site, so it is possible a higher value has gone unreported







Summary statistics for December 2020
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
December
2020
Diff
from
average
Highest for
December
2020
Mean for
December
2020
Diff
from
average
Lowest for
December
2020
Total for
December
2020
Average
for
December
Rank of
December
2020
Fraction of
December
average
Badgerys Creek AWS 27.0 -1.7 34.4 4th 15.9 +0.4 9.9 9th 89.8 55.0 average 163%
Bankstown Airport AWS 27.0 -0.6 35.1 4th 17.4 +0.7 13.0 9th 67.2 average
Camden Airport AWS 27.0 -1.7 34.9 1st 15.8 +0.5 9.0 9th 79.4 57.1 high 139%
Campbelltown (Mount Annan) 26.9 -1.6 34.4 17th 15.3 0.0 8.9 9th 69.8 58.1 average 120%
Canterbury Racecourse AWS 25.8 -0.9 33.2 4th 17.1 +0.2 12.3 9th 81.6 64.1 average 127%
Cooranbong (Lake Macquarie AWS) 26.2 -1.4 33.3 18th 16.9 +0.9 10.8 9th 220.6 87.6 v high 252%
Gosford AWS 25.1   32.8 18th 17.5   12.2 9th 197.6
Holsworthy Aerodrome AWS 26.4   34.6 4th 16.4   10.7 9th 74.6
Holsworthy Defence AWS 25.9   34.6 4th 15.7   10.9 9th 88.2
Horsley Park Equestrian Centre AWS 26.6 -1.9 35.0 1st 16.2 0.0 11.0 9th 113.6 65.7 high 173%
Katoomba (Farnells Rd) 20.5 -2.0 34.2 1st 10.6 -1.2 5.4 10th 204.8 121.5 high 169%
Mangrove Mountain AWS 25.0 -1.5 35.9 1st 15.7 +0.3 10.0 9th 211.2 90.8 v high 233%
Mount Boyce AWS 21.1 -1.7 33.6 1st 11.3 -0.4 5.0 8th 159.8 84.3 v high 190%
Norah Head AWS 25.3 +0.2 31.7 6th 18.7 +0.2 15.0 9th 172.8 69.4 highest 249%
Parramatta North (Masons Drive) 26.4 -1.2 34.5 4th 16.4 +0.1 11.5 23rd 111.2 72.8 high 153%
Penrith Lakes AWS 28.0 -1.8 38.5 1st 16.8 -0.3 11.7 9th 120.2 63.1 v high 190%
Richmond RAAF 27.1 -2.0 38.1 1st 16.5 +0.3 10.8 9th 122.2 69.3 v high 176%
Springwood (Valley Heights) 25.1 -2.3 34.5 1st 15.1 -0.4 10.9 9th 210.8 101.8 high 207%
Sydney (Observatory Hill) 26.1   30.8 7th 18.1   14.4 9th 119.0
Sydney Airport AMO 26.2 +0.3 34.0 18th 18.4 +0.8 15.0 9th 72.0 72.7 average 99%
Sydney Harbour (Wedding Cake West) 23.5 -0.1 30.9 18th 18.7 -0.2 16.0 8th
Sydney Olympic Park AWS (Archery Centre) 26.6   34.7 4th 17.4   12.8 9th 96.2 79.2 high 121%
Terrey Hills AWS 24.0 -1.7 30.3 18th 16.5 -0.2 12.0 9th 243.0 89.1 v high 273%

Daily maximum temperatures for December 2020
12345678910111213141516171819202122232425262728293031
Badgerys Creek AWS34.424.730.029.625.528.429.623.825.826.526.326.331.233.631.220.125.924.527.026.329.320.425.633.131.720.621.623.1
Bankstown Airport AWS32.524.424.235.126.130.731.023.827.628.623.424.924.724.825.730.333.932.920.624.424.428.325.929.221.125.632.831.021.423.924.2
Camden Airport AWS34.925.423.834.324.629.629.524.828.629.122.324.226.725.426.731.134.332.219.226.224.626.427.029.820.324.833.431.421.422.122.7
Campbelltown (Mount Annan)33.924.523.534.324.329.729.625.028.329.423.424.426.426.225.731.234.432.519.525.124.426.627.329.720.825.133.430.120.622.623.5
Canterbury Racecourse AWS28.322.823.533.225.030.029.822.125.627.621.724.224.724.326.227.931.932.419.923.523.428.024.526.521.525.030.427.420.523.623.5
Cooranbong (Lake Macquarie AWS)30.622.525.928.127.232.431.423.124.427.321.423.223.623.724.529.532.433.320.922.922.429.625.426.523.724.832.030.922.422.822.7
Gosford AWS28.522.422.827.925.331.130.522.023.526.320.523.423.424.024.328.031.032.819.522.722.428.024.326.021.724.227.730.320.020.922.6
Holsworthy Aerodrome AWS32.423.723.634.625.129.829.923.127.627.422.124.524.924.024.928.933.632.020.123.824.026.925.728.821.225.231.329.421.324.224.2
Holsworthy Defence AWS33.022.023.634.623.230.129.822.627.427.820.922.024.423.723.528.534.033.019.023.923.526.124.330.020.823.832.727.120.623.122.7
Horsley Park Equestrian Centre AWS35.023.423.434.625.029.729.525.327.728.922.424.424.925.125.430.133.132.319.624.124.227.226.229.121.524.532.630.519.721.923.1
Katoomba (Farnells Rd)34.220.718.227.223.020.020.724.224.013.916.217.316.019.923.328.725.214.519.317.319.121.124.414.518.827.814.715.015.0
Mangrove Mountain AWS35.921.222.033.624.829.829.523.526.129.318.521.521.723.123.327.831.629.618.020.820.427.023.926.821.423.532.630.619.218.520.1
Mount Boyce AWS33.621.319.726.522.019.119.917.524.523.514.718.319.219.521.124.426.924.515.619.717.718.221.623.816.319.227.427.915.616.317.2
Norah Head AWS27.724.223.226.425.531.730.721.724.026.122.324.223.324.424.527.629.231.120.821.721.928.123.126.724.227.428.530.521.521.322.1
Parramatta North (Masons Drive)33.623.025.034.525.529.829.724.027.228.222.524.223.624.525.029.533.331.219.923.824.027.726.028.521.024.431.830.719.722.524.3
Penrith Lakes AWS38.524.923.536.026.530.630.527.329.331.523.826.326.527.125.533.134.934.019.825.624.229.028.430.421.126.434.134.219.621.623.6
Richmond RAAF38.124.522.834.826.730.029.926.328.130.022.724.725.225.425.631.733.230.119.224.123.628.827.129.621.825.133.833.819.821.223.4
Springwood (Valley Heights)34.522.123.033.227.427.727.925.325.929.020.222.022.523.322.128.931.230.817.322.121.725.925.227.118.322.531.033.317.719.220.6
Sydney (Observatory Hill)28.424.023.030.025.130.730.824.526.727.323.925.127.524.824.827.730.530.319.623.724.527.626.326.921.925.827.430.320.824.024.5
Sydney Airport AMO29.324.123.330.026.231.831.821.825.926.522.225.126.325.026.428.531.934.020.224.223.829.223.828.120.926.030.325.220.824.924.0
Sydney Harbour (Wedding Cake West)25.421.521.723.924.029.529.319.321.622.720.321.222.323.022.523.126.530.919.722.523.027.422.322.120.321.928.127.321.022.222.8
Sydney Olympic Park AWS (Archery Centre)32.523.424.934.725.531.230.923.527.027.822.324.124.124.625.728.934.032.219.924.124.328.525.328.521.425.230.031.320.223.524.1
Terrey Hills AWS20.922.628.522.829.429.220.923.325.320.522.322.822.622.126.230.130.318.021.422.327.423.725.019.822.627.930.219.420.421.6
Values are the maximum temperature, usually in the 24 hours from 9 am on the day indicated,
and typically occurred in the afternoon of that day.
Temperatures coloured according to their difference
from the long-term average for the period
-10.0 -9.0 -8.0 -7.0 -6.0 -5.0 -4.0 -3.0 -2.0 -1.0 0.0 +1.0 +2.0 +3.0 +4.0 +5.0 +6.0 +7.0 +8.0 +9.0 +10.0 °C Grey outline marks highest
and lowest for the period

Daily minimum temperatures for December 2020
12345678910111213141516171819202122232425262728293031
Badgerys Creek AWS16.816.418.710.413.59.913.215.313.712.516.618.019.720.119.616.816.617.516.813.614.817.515.014.817.915.616.116.7
Bankstown Airport AWS18.418.617.118.816.820.213.915.213.015.516.715.914.617.818.920.621.721.318.917.718.017.715.515.717.916.616.219.716.617.116.6
Camden Airport AWS16.317.916.117.516.216.710.113.49.012.215.013.113.317.117.919.620.619.817.816.517.616.713.614.217.314.914.317.615.217.115.7
Campbelltown (Mount Annan)16.617.115.916.315.915.79.512.78.912.415.012.713.216.117.820.020.318.917.316.516.416.610.613.816.815.114.017.314.816.614.3
Canterbury Racecourse AWS17.319.016.816.819.120.313.215.412.314.116.516.213.517.518.920.521.220.619.017.617.417.615.815.017.717.015.719.816.817.215.2
Cooranbong (Lake Macquarie AWS)16.319.818.516.515.619.013.014.510.812.015.814.514.517.118.521.421.320.018.818.318.418.813.714.517.917.415.919.117.216.618.6
Gosford AWS18.519.717.417.519.020.614.415.512.214.415.417.213.817.318.220.621.421.118.618.117.518.414.315.319.117.215.820.917.418.218.4
Holsworthy Aerodrome AWS17.118.116.317.415.218.412.314.310.713.615.515.714.417.418.420.420.620.117.917.317.017.314.314.717.216.215.218.615.516.715.6
Holsworthy Defence AWS16.417.115.417.015.816.412.512.810.913.214.014.514.216.517.619.819.819.616.616.416.416.813.613.615.915.614.618.514.716.214.2
Horsley Park Equestrian Centre AWS16.217.716.116.916.720.013.114.011.013.715.013.913.816.418.220.020.020.417.316.716.816.912.715.217.315.215.218.115.616.117.1
Katoomba (Farnells Rd)12.910.410.710.011.010.35.46.56.48.510.811.414.015.218.111.611.011.811.86.69.710.29.510.710.510.510.610.2
Mangrove Mountain AWS14.417.415.617.017.418.613.712.810.012.413.113.312.215.816.619.520.421.216.816.415.916.912.714.416.315.114.320.315.415.916.1
Mount Boyce AWS10.113.811.212.710.611.510.05.06.410.77.17.39.311.412.115.515.918.112.611.912.713.37.310.611.310.511.816.511.911.310.6
Norah Head AWS19.719.518.818.819.920.417.616.715.017.017.617.519.217.918.721.121.121.119.518.819.518.616.217.518.518.817.721.618.018.519.5
Parramatta North (Masons Drive)15.016.716.617.116.819.015.414.815.213.615.515.812.316.618.020.019.920.018.517.216.817.011.515.817.315.815.517.615.516.016.2
Penrith Lakes AWS17.219.016.618.018.119.815.113.011.714.815.415.713.917.218.419.920.520.917.117.018.117.513.915.817.515.616.018.415.716.516.9
Richmond RAAF16.819.016.818.118.319.613.313.210.813.414.915.511.617.218.319.720.320.417.417.018.017.712.815.817.615.515.918.215.616.116.9
Springwood (Valley Heights)16.017.514.715.716.318.314.512.010.913.412.213.112.414.016.518.118.720.515.414.816.716.114.014.815.313.814.016.014.014.415.2
Sydney (Observatory Hill)19.319.017.218.619.520.918.015.614.416.917.015.516.018.118.720.621.422.219.018.018.817.716.217.218.017.517.319.316.917.218.3
Sydney Airport AMO19.719.016.818.419.520.517.815.515.018.017.416.817.918.218.820.622.022.919.117.518.415.918.317.917.317.622.316.617.319.1
Sydney Harbour (Wedding Cake West)18.820.018.119.220.520.919.416.016.017.918.116.017.518.218.820.421.421.819.418.119.018.517.718.618.217.918.619.617.717.720.4
Sydney Olympic Park AWS (Archery Centre)17.719.017.417.718.619.814.115.812.815.416.216.514.117.519.020.621.121.419.417.818.517.815.515.918.117.016.319.116.917.116.2
Terrey Hills AWS17.517.615.616.418.018.616.513.712.014.315.014.414.216.517.619.420.322.816.616.417.016.912.915.716.416.015.619.915.116.316.9
Values are the minimum temperature, usually in the 24 hours to 9 am on the day indicated,
and typically occurred that morning.
Temperatures coloured according to their difference
from the long-term average for the period
-10.0 -9.0 -8.0 -7.0 -6.0 -5.0 -4.0 -3.0 -2.0 -1.0 0.0 +1.0 +2.0 +3.0 +4.0 +5.0 +6.0 +7.0 +8.0 +9.0 +10.0 °C Grey outline marks highest
and lowest for the period

Daily rainfall for December 2020
12345678910111213141516171819202122232425262728293031
Abbotsbury (Fairfield (City Farm)) - 2.0 1.0 - - 7.0 - - - - - - - - 3.0 6.0 4.0 11.0 - 2.0 - 26.0 - - - 1.0 3.0 - 19.0 5.0 2.0
Abbotsford (Blackwall Point Rd) - 10.0 - - - 5.4 - - - - 0.4 1.0 1.0 3.0 7.0 17.0 0.6 0.6 0.8 5.0 0.6 24.0 - - 0.1 2.0 5.0 - 12.0 6.0 -
Audley (Royal National Park) - 12.0 2.0 - - 3.0 - - - - - - - 2.0 7.0 16.0 - 3.0 6.0 1.0 - 23.0 - - - - 1.0 - 7.0 8.0 -
Avalon Beach (Avalon (Palmgrove Rd)) 0.6 9.4 1.4 - - 14.6 - - - - - 1.0 - 2.6 14.6 20.0 14.0 - 10.2 6.0 4.2 34.6 - - 2.4 4.2 1.6 - 6.2 39.0 2.0
Badgerys Creek AWS - - -

3.2 - - - - - 0.6 - 0.4 7.4 8.4 9.2 2.6 1.0 0.8 0.2 29.6 - - - 0.4 4.4 - 14.6 4.0 3.0
Bankstown Airport AWS - 2.2 0.4 - - 7.0 - - - - - - 3.6 0.8 7.4 7.0 1.8 8.2 0.4 0.6 0.8 0.8 0.4 - - 1.2 3.2 0.2 16.8 2.8 -
Baulkham Hills Eucalyptus Ct - 12.5 - - - 7.0 - - - - - - 1.0 4.0 3.5 6.0 3.0 0.5 3.5 3.5 - 24.0 - - - 1.5 7.0 - 10.0 13.0 0.5
Belrose (Evelyn Place) - 9.4 2.4 - - 14.2 - - - - 0.2 1.2 - 8.6 10.0 30.6 0.2 1.6 6.0 9.8 1.0 28.0 - - 0.6 2.8 3.2 - 9.6 78.0 2.0
Blackheath (Wombat Street) 1.0 4.0 10.0 - - 12.0 - - - - 2.0 2.0 1.0 10.0 12.0 35.0 10.0 1.0 8.0 2.0 - 25.0 - - 1.0 8.0 13.0 - 14.0 22.0 5.0
Box Hill (McCall Gardens) - 12.0 - 1.0 - 6.0 - - - - - - - 1.0 4.0 3.0 5.0 - 3.0 2.0 - 24.0 - - - 5.0 12.0 - 18.0 11.0 -
Bringelly (Maryland) - 3.0 1.0 - - 2.0 - - - - - - - - 4.0 4.0 3.0 3.0 - - - 43.0 - - - - 1.0 - 8.0 2.0 -
Camden (Brownlow Hill) - 9.0 3.2 - - 1.2 - - - - - - - 2.4 2.0 10.4 4.8 1.4 1.4 0.8 - 30.6 - - - 0.6 1.4 - 15.2 0.4
Camden Airport AWS - 8.8 2.4 - - 1.0 - - - - - - - 0.6 3.2 8.2 7.2 1.2 1.6 0.6 - 30.8 - - - 0.4 0.2 - 12.8 0.2 0.2
Campbelltown (Kentlyn (Georges River Roa - 8.0 - - - 3.0 - - - - - - - 2.0 2.0 13.0 2.0 12.0 1.0 - - 28.0 - - - - 1.0 - 11.0 2.0 -
Campbelltown (Mount Annan) - 6.8 2.0 - - 1.8 - - - - - - - 1.2 2.8 9.8 1.4 3.6 1.4 0.4 - 25.2 - - - 1.0 0.4 - 11.2 0.8 -
Canterbury Racecourse AWS - 9.0 0.4 - - 2.2 0.6 - 0.2 - 0.4 - 3.0 3.2 5.0 11.2 - 0.4 0.6 2.4 - 22.6 - - - 0.6 1.6 - 7.8 10.4 -
Castle Cove (Rosebridge Ave) - 9.0 0.5 - - 11.5 - - - - - 2.0 - 4.0 - 23.0 1.0 3.5 3.5 9.0 4.0 25.0 - - - 2.5 5.0 - 9.0 43.0 2.0
Castle Hill (Kathleen Ave) - 9.0 - - - - - - - - - - - 11.0 5.3 4.0 3.4 - 5.4 3.6 24.2 - - - - - 7.9 - 10.3 18.6 0.7
Cawdor (Woodburn) - 4.6 3.0 - - - - - - - - - - 1.6 3.0 11.4 3.8 1.0 5.8 - - 34.0 - - - - - - 14.6 - -
Centennial Park - 7.0 - 1.4 - 7.0 - - - - - 0.2 0.8 2.2 10.1 9.6 0.8 - 0.8 7.0 - 27.0 - - 2.2 1.2 2.6 - 14.0 17.4 -
Chatswood Bowling Club - 7.0 1.0 - - 7.0 - - - - - - 1.0 3.0 7.0 18.0 1.0 - 1.0 9.0 1.0 23.0 - - - 2.0 4.0 - 12.0 31.0 -
Collaroy (Long Reef Golf Club) - 5.8 - - - 11.0 - - - - - - - 1.8 7.2 9.4 - - 3.2 3.4 - 25.6 - - 1.2 4.8 2.5 - 8.0 36.8 0.4
Colo Heights (Mountain Pines) - - 5.0 5.4 - 13.6 - - - - 4.4 1.2 - 3.0 8.4 12.4 33.6 4.0 14.0 9.4 0.8 25.0 - - 5.0 - 2.4 - 22.2 14.8 4.8
Concord (Brays Rd) - 10.2 - - - 5.4 - - - - - 0.4 0.2 4.8 6.0 12.4 0.6 0.6 0.4 3.8 0.6 23.4 - - - 1.6 6.0 - - 5.4 0.2
Concord Golf Club - 10.4 - - - 6.0 - - - - - - 1.8 3.0 6.2 11.6 0.8 - - 5.4 0.6 25.0 - - - 1.6 6.4 - 11.8

Cooranbong (Avondale) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Cooranbong (Lake Macquarie AWS) 0.6 13.0 - 0.2 - 17.2 - - - - 7.2 1.6 - 1.6 19.8 28.2 - - 9.8 11.0 5.2 60.4 - - - - 5.2 - 14.4 4.4 20.8
Darkes Forest (Kintyre) - - 5.0 - - 2.0 - - - - 5.0 1.0 3.0 6.0 3.0 21.0 1.0 3.0 7.0 - - 20.0 - - - 1.0 4.0 - 14.0 8.0 -
Dover Heights (Portland St) - 5.2 0.2 - - 7.4 - - - - - - 2.8 3.0 7.8 4.6 0.4 - 4.6 8.2 1.0 27.8 - - 2.6 8.2 2.0 - 10.0 30.4 -
Erskine Park Reservoir - 3.0 2.0 - - 7.0 - - - - - - - 3.0 6.0 3.0 6.0 - 1.0 2.0 - 26.0 - - - 1.0 8.0 - 15.0 8.0 3.0
Faulconbridge (Great Western Hwy) - 4.0 15.0 1.0 - 6.0 - - - - 4.0 - - 4.0 8.0 47.0 33.0 - 5.0 8.0 - 22.0 - - 1.0 3.0 4.0 - 17.0 19.0 5.0
Faulconbridge (St Georges Crescent) - 3.8 14.6 1.0 - 8.0 - - - - 4.0 0.2 0.4 4.8 7.6 30.8 18.6 0.2 5.0 8.6 0.2 23.6 - - 0.4 4.0 5.4 - 19.4 20.4 4.8
Gears (Wyong River) -
- - -



- 2.0 - - 3.0 14.0 24.0

16.0 2.0 - 16.0 -
- 1.0 3.0 - 11.0 6.0 9.0
Gosford AWS - 15.4 1.4 - - 19.0 - - - - 5.6 - - 3.4 14.4 13.4 - - 7.2 10.4 1.2 45.8 - - - 6.2 1.6 - 9.8 32.4 10.4
Holsworthy Aerodrome AWS - 4.6 0.4 - - 4.6 - - - - - - - 1.8 4.0 8.4 1.8 6.6 0.8 0.6 - 24.8 - - - 1.0 0.8 - 12.2 2.2 -
Holsworthy Defence AWS - 7.0 0.8 - - 3.4 - - - - - - 0.6 1.2 2.4 13.2 2.0 4.6 5.4 0.2 - 26.2 0.2 - - 1.2 0.6 - 18.2 1.0 -
Hornsby (Swimming Pool) - 7.4 2.6 - - 15.0 - - - - 1.2 0.4 0.6 4.2 8.6 24.4 0.8 - 9.2 7.0 0.6 26.4 - - 0.8 5.2 6.0 0.2 8.4 42.0 1.0
Horsley Park Equestrian Centre AWS -
1.4 0.2 - 8.4 0.2 - -
- - 0.4 1.8 5.4 5.4 4.4 14.8 1.2 1.8 0.2 27.6 0.2 - - 0.8 10.0 - 20.6 7.4 1.4
Katoomba (Farnells Rd) 6.6 6.4 0.2 0.2 7.6 - - - - 7.4 0.6 2.8 7.8 9.0 35.4 36.0 1.0 3.0 6.0 0.2 23.2 - - 0.4 6.8 4.0 - 10.8 25.8 3.6
Kurrajong Heights (Bells Line of Road) - 0.8 21.0 - 5.8 - - - - 6.0 0.2 1.2 3.4 9.8 31.8 23.8 2.0 10.0 8.4 1.0 28.2 - - 6.8 1.8 - 21.2 26.2 4.8
Lucas Heights (ANSTO) - 9.4 - - 3.4 - - - - 0.6 0.4 - 1.6 3.4 20.0 1.2 23.4 - - - 1.0 6.0 - - - 1.0
Macquarie Park (Willandra Village) - 8.4 0.6 - - 8.4 - - - - 1.2 0.4 0.2 4.0 6.0 20.0 1.0 0.8 4.2 5.6 1.4 25.4 0.2 - - 2.0 10.0 - 9.8 23.4 0.2
Mangrove Mountain AWS - 9.0 0.4 0.4 - 23.4 0.2 - - - 7.2 1.0 0.2 6.6 12.2 35.2 0.6 0.4 4.8 10.4 1.2 47.0 - - 0.2 3.6 4.4 0.2 20.4 9.8 12.4
Marrickville Golf Club - 10.0 - - - 5.0 - - - - - - - 4.0 9.0 13.0 - - 1.0 3.0 - 23.0 - - - - 1.0 - 10.0 10.0 -
Menangle Bridge (Nepean River) - 6.0 1.0 - - 1.0 - - - - - - 1.0 1.0 2.0 7.0 5.0 14.0 5.0 - - 26.0 - - - - 3.0 - 11.0 - -
Mona Vale Golf Club - 10.0 1.0 - - 16.2 - - - - - 1.6 - 2.0 11.6 18.8 - - 9.4 5.6 - 34.8 - - 3.0 4.0 4.2 - 4.4 47.6 2.2
Mount Annan (Australian Botanic Garden) - 7.4 0.8 0.2 - 1.6 - - - - - 0.2 2.0 0.6 4.0 9.8 2.0 1.8 2.6 4.0 - 23.8 - - - 1.2 0.5 - 11.6 0.9 -
Mount Boyce AWS 0.2 3.0 5.4 0.4 - 9.8 0.2 - - - 5.2 1.0 0.8 8.6 7.8 22.8 11.2 - 6.8 1.6 - 24.2 - - 0.2 4.2 10.8 0.2 13.6 19.6 2.2
Mount Wilson (Clarine) - 2.0 12.8 0.2 - 9.4 - - - - 7.0 2.0 0.8 8.6 9.8 32.4 14.0 9.0 7.0 4.8 - 26.0 3.4 - 1.2 8.4 10.0 - 16.0 22.0 4.4
Norah Head AWS - 5.8 - - - 20.6 - - - - - - - 2.6 10.4 6.4 0.2 0.2 14.2 11.2 2.2 63.2 - - 4.8 2.0 2.4 - 14.8 3.6 8.2
North Parramatta (Burnside Homes) - 10.5 - - - 7.5 - - - - - - 0.5 5.0 6.0 11.5 2.0 - 1.5 4.5 0.5 25.5 - - - 1.5 6.5 - 10.5 10.5 1.5
North Rocks (Muirfield Golf Club) - - - - - 7.0 - - - - 1.0 - - 3.0 4.0 8.0 2.0 2.0 3.5 4.0 0.5 21.5 0.5 - - 0.5 5.0 - 8.0 13.5 2.5
North Ryde Golf Club
5.0 - - - 1.0 -
- - - - 1.0 4.0 6.0 12.0 1.0 - 1.0 7.0 1.0 23.0 - - - 2.0 8.0 - 11.0 17.0 -
Palm Grove (Lyrebird Lane) - 9.0 2.0 - - 20.0 - - - - 5.0 - - 4.0 18.0 29.0 - - 3.0 12.0 1.0 49.0 - - 1.0 4.0 3.0 - 13.0 8.0 16.0
Parramatta North (Masons Drive) - 11.8 0.2 - - 7.2 - - - - - - 1.6 5.0 6.6 11.0 2.4 0.6 1.6 4.8 0.4 24.4 - - - 1.8 7.2 - 12.0 11.0 1.6
Peakhurst Golf Club









- - - 2.0 7.0 10.0 - 1.0 1.0 1.0 - 24.0 - - - 1.0 - - 5.0 6.0 -
Pennant Hills (Yarrara Road) - 7.6 1.6 - - 9.8 - - - - 2.2 1.0 - 6.0 7.0 17.8 1.2 38.6 - - - 3.8 5.8 - 9.2 27.2 1.2
Penrith Lakes AWS 0.2 9.0 6.4 - 0.2 5.0 - - - - - - - 2.0 3.4 14.8 9.6 - 1.4 3.6 0.2 20.6 - - 0.2 1.4 5.4 - 22.0 12.4 2.4
Prospect Reservoir - 8.0 2.0 - - 6.0 - - - - - - - 3.0 6.0 5.0 5.0 16.0 1.0 3.0 - 27.0 - - - 1.0 8.0 - 16.0 9.0 1.0
Putty (The Gibba)




- - - -

- - - - - 32.0 22.0 8.0 4.0 - 34.0 - - - - 7.0 - - - -
Randwick (Randwick St) - 6.6 0.4 - - 7.2 - - - - - 1.6 1.2 2.4 11.4 7.2 0.2 - 1.2 9.8 0.6 28.0 - - 4.2 2.0 0.8 - 12.4 24.4 -
Richmond RAAF - 13.4 3.0 - 0.2 5.0 - - - - 1.0 0.2 0.2 2.8 3.8 9.6 8.0 - 2.6 5.2 0.2 21.0 - - - 3.4 2.2 - 23.4 15.0 2.0
Rose Bay (Royal Sydney Golf Club) - 5.0 0.4 - - 6.8 - - - - - 1.4 - 2.4 8.2 6.4 - - 3.0 8.0 0.8 26.8 - - 1.8 3.0 2.0 - 5.6 20.4 -
Rossmore (South Creek) - 4.0 2.0 - - 1.0 1.0 - - - - - 1.0 1.0 1.0 1.0 - - - - - - - - - - - - - - -
Sans Souci (Public School) - 1.0 1.0 - - 5.0 - - - - - - - - 4.0 4.0 1.0 - 1.0 - - 21.0 - - - 2.0 - - 6.0 5.0 -
Seven Hills (Radio FM 103.2) - 8.5 - 0.5 - 6.5 - - - - - - 0.5 3.5 5.5 3.0 4.0 3.5 2.0 2.5 - 23.0 - - - 0.5 8.0 - 13.5 7.5 -
Shanes Park (South Creek Road)




1.2



- - 0.2 1.2 3.6 11.2 6.6 - 1.8 3.0 0.2 23.6 - - - 2.4 14.8 - 18.8 8.8 2.0
Springwood (Valley Heights) - 6.6 12.6 0.8 - 6.0 - - - - 5.2 - 0.8 5.0 6.8 39.4 40.4 - 4.6 7.0 0.2 21.4 - - 0.2 3.6 6.0 - 20.0 19.0 5.2
St Ives (Richmond Avenue) - 9.4 3.6 - - 14.8 - - - - 0.2 1.8 1.6 11.4 9.6 34.8 1.2 - 7.2 8.6 1.0 28.6 - - 3.0 5.6 4.8 - 8.2 73.0 2.0
Sydney (Observatory Hill) - 6.8 0.6 - - 6.2 - - - - - 1.6 1.6 3.6 11.6 12.2 0.2 - 1.4 7.0 1.6 26.2 - - 0.6 0.8 3.6 - 14.0 19.2 0.2
Sydney Airport AMO - 8.8 0.2 - - 5.2 - - - - - - - 1.0 4.8 6.8 0.4 0.2 1.8 1.6 0.4 20.4 - - 0.6 0.8 0.2 - 7.8 10.8 0.2
Sydney Botanic Gardens - 6.4 0.6 - - 6.5 - - - - 1.6 - 3.2 3.6 12.2 12.4 0.2 - 1.6 6.0 2.2 25.6 - - 0.6 1.8 - - 14.0 20.0 5.0
Sydney Olympic Park AWS (Archery Centre) - 11.4 0.2 - - 6.2 - - - 0.2 0.8 0.4 0.2 6.2 5.8 9.6 0.8 0.6 0.6 3.6 0.6 23.4 - - - 1.4 6.4 - 12.8 4.6 0.4
Terrey Hills AWS - 5.0 4.2 - 0.2 12.6 - - - - 0.2 0.8 0.4 6.8 11.2 28.0 0.2 - 7.6 7.8 0.8 31.6 - - 1.6 5.6 5.4 - 5.2 105 2.8
Wahroonga (Ada Avenue)









0.8 0.8 0.4 9.8 7.8 41.6 1.2 0.2 7.0 11.2 1.2 27.6 - - 1.0 9.8 5.2 - 9.4 37.8 2.0
Warragamba - 6.0 10.0 - - 3.0 - - - - - - - 1.0 7.0 38.0 9.0 19.0 2.0 3.0 - 39.0 - - - 2.0 20.0 - 23.0 10.0 2.0
Wedderburn (Booalbyn) - 2.0 - - - 2.0 - - - - - - 1.0 2.0 3.0 9.0 3.0 7.0 5.0 - - 22.0 - - - - 3.0 - 14.0 - -
Wyong (Jilliby (Jilliby Creek)) - 4.2



- - - - 3.6 1.2 -

















Wyong (Kulnura (Jeavons)) - 14.0 - - - 15.0 - - - - 2.0 1.0 - 8.0 12.0 19.0 - - 16.0 10.0 1.0 51.0 1.0 - - - 4.0 - 15.0 10.0 9.0
Wyong (Mount Elliot) - 8.0 4.0 - - 22.0 - - - - 3.0 - - 7.0 19.0 16.0 - - 5.0 14.0 4.0 60.0 - - 1.0 18.0 2.0 - 12.0 39.0 21.0
Wyong (Olney Forest) - 9.0 1.0 1.0 - 13.0 - - - - 11.0 - - 7.0 23.0 41.0 3.0 - 11.0 11.0 3.0 52.0 - - - 2.0 5.0 - 11.0 7.0 22.0
Yarramalong (Lewensbrook) - 11.4 - 1.0 - 16.4 - - - - 4.4 1.0 - 8.0 14.0 32.6 0.2 - 20.0 8.0 2.0 49.0 - - 1.0 4.0 4.0 - 13.0 6.0 9.0
Most values are the precipitation in the 24 hours to 9 am on the day indicated. Days marked with → are part of a longer accumulation, which is shown on the final day.
Values over 100 mm have been rounded to the nearest whole millimetre.
Days marked with - have a rainfall report of zero; days left blank have no rainfall report (which often indicates no rain fell).
Rainfalls coloured
according to the amount
0 1.0 5.0 10.0 15.0 25.0 50.0 100 150 200 300 400 600 millimetres

Notes

The Monthly climate summary, generally published on the first working day of each month, lists the main features of the weather in Greater Sydney using the most timely and accurate information available on the date of publication; it will generally not be updated. More extensive discussion of significant weather events, along with later information and data that has had greater opportunity for quality control, will be presented in the Monthly Weather Review.

This summary includes data from observing sites in or near the Greater Sydney “Greater Capital City Statistical Area” (GCCSA). The Australian Bureau of Statistics designed the GCCSAs to “include the population within the urban area of the city, as well as people who regularly socialise, shop or work within the city, and live in small towns and rural areas surrounding the city. It is important to note that GCCSAs do not define the built up edge of the city. They provide a stable definition for these cities and are designed for the output of a range of social and economic survey data.

This statement has been prepared based on information available at 11 am on Monday 4 January 2021. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

In some situations, some or all of the rainfall is in the form of hail or snow. In these cases the totals given are for the water equivalent: the depth of liquid water that results from melting any frozen precipitation. There can be significant 'undercatch' of snow in strong winds, meaning the true precipitation can be higher than that reported.

Averages for individual sites are long-term means based on observations from all available years of record, which vary widely from site to site. They are not shown for sites with less than 10 years of record, as they cannot then be calculated reliably.
The median is sometimes more representative than the mean of long-term average rain.

The Rank indicates how rainfall this time compares with the climate record for the site, based on the decile ranking (very low rainfall is in decile 1, low in decile 2 or 3, average in decile 4 to 7, high in decile 8 or 9 and very high is in decile 10).
The Fraction of average shows how much rain has fallen this time as a percentage of the long-term mean.

Where temperature area averages are mentioned, they are derived from the ACORN-SAT dataset.

Further information

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