Greater Sydney in December 2021: cool days and relatively wet

Daytime temperatures in December were 1 to 2 degrees below average across much of Greater Sydney. Night-time temperatures were close to average. December rainfall was generally above average, with severe thunderstorms on several days.

Above average rain

  • December rainfall was 10 to 40% above average across much of Greater Sydney.
  • Parts of Western Sydney were much wetter than usual, with Penrith Lakes and Badgerys Creek both receiving monthly totals more than 70% above their December average.
  • Observatory Hill and three nearby inner Sydney sites had their highest total December rainfall since 1992.
  • Thunderstorms affected parts of Greater Sydney on the 3rd and the 7th.
  • The heaviest rainfall occurred during the passage of a deep surface trough from the 8th to the 10th.
  • Daily totals of over 50 mm in the 24 hours to 9am on the 10th were recorded in the Central Coast area of Greater Sydney, with widespread falls of 15–40 mm elsewhere.
  • The highest daily total was 71.0 mm in the 24 hours to 9am on the 11th at Campbelltown (Kentlyn), also the highest December daily rainfall on record for that site.

Relatively cool days

  • Daytime temperatures were relatively cool in December across Greater Sydney.
  • Mean maximum temperatures were 1–2 °C below average away from the coast, but generally within 0.5 °C of the average at coastal sites.
  • The warmest days were on the 18th and 19th ahead of a cold front, with December's highest temperature of 38.9 °C being recorded at Holsworthy Defence AWS on the 18th.
  • Mean minimum temperatures were generally within 0.5 °C of their average across Greater Sydney.

Sydney (Observatory Hill)

  • Total rainfall for Sydney (Observatory Hill) was 132.8 mm which is 172% of the average over all years at the former Observatory Hill site, or 182% of the average over recent decades.
  • The mean daily maximum temperature for Sydney (Observatory Hill) was 26.1 °C, which is 0.9 °C above the average over all years at the former Observatory Hill site, or 0.4 °C above the average over recent decades.
  • The warmest day was 34.6 °C on the 19th, and the coolest day was on the 5th when the temperature reached 19.7 °C.
  • The mean daily minimum temperature for Sydney (Observatory Hill) was 17.9 °C, which is 0.3 °C above the average over all years at the former Observatory Hill site, or 0.5 °C below the average over recent decades.
  • The coldest morning was 13.9 °C on the 10th, and the warmest morning was on the 19th when the minimum temperature was 21.4 °C.
  • Severe thunderstorm affected the Northern Beaches

    • A strong cold front crossed Greater Sydney on the 19th, bringing damaging winds and storms.
    • A severe thunderstorm with strong winds impacted the Northern Beaches area, damaging houses and bringing down trees.
    • The State Emergency Service received almost 600 requests for assistance.
    • A gust of 100 km/h was recorded at Mount Boyce.

    Further information

    Media
    (03) 9669 4057

    Extremes in December 2021
    Hottest day 38.9 °C at Holsworthy Defence AWS on the 18th
    Warmest days on average 28.1 °C at Penrith Lakes AWS
    Coolest days on average 21.8 °C at Mount Boyce AWS
    Coldest day 10.1 °C at Mount Boyce AWS on the 10th
    Coldest night 5.6 °C at Mount Boyce AWS on the 10th
    Coolest nights on average 11.4 °C at Mount Boyce AWS
    Warmest nights on average 18.7 °C at Norah Head AWS
    Warmest night 23.0 °C at Norah Head AWS on the 21st and the 23rd
    Warmest on average overall 22.4 °C at Norah Head AWS
    Coolest on average overall 16.6 °C at Mount Boyce AWS
    Wettest overall 181.0 mm at Wyong (Mount Elliot)
    Wettest day 71.0 mm at Campbelltown (Kentlyn (Georges River Roa on the 11th
    Strongest wind gust 100 km/h at Mount Boyce AWS on the 19th

    Record highest December daily rainfall
    New record
    (mm)
    Old
    record
    Years of
    record
    Campbelltown (Kentlyn (Georges River Roa 71.0 on the 11th 68.8 on the 9th in 1970 42



    Highest December total rainfall for at least 20 years
    Observed
    (mm)
    Most recent
    higher
    Average for
    December
    Randwick (Randwick St) 159.4 180.4 in 1992 76.8
    Sydney Botanic Gardens 163.3 205.4 in 1992 82.4
    Centennial Park 144.0 144.1 in 1992* 83.4

    * 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 2021
    Maximum temperatures
    (°C)
    Minimum temperatures
    (°C)
    Rainfall
    (millimetres)
    Mean for
    December
    2021
    Diff
    from
    average
    Highest for
    December
    2021
    Mean for
    December
    2021
    Diff
    from
    average
    Lowest for
    December
    2021
    Total for
    December
    2021
    Average
    for
    December
    Rank of
    December
    2021
    Fraction of
    December
    average
    Badgerys Creek AWS 27.1 -1.5 37.5 18th 15.3 -0.2 11.2 14th 96.6 56.5 high 171%
    Bankstown Airport AWS 26.9 -0.6 38.2 18th 16.9 +0.1 13.0 14th 69.0 67.3 average 103%
    Camden Airport AWS 27.2 -1.4 37.0 18th 15.3 0.0 10.8 14th 74.8 57.5 average 130%
    Campbelltown (Mount Annan) 27.0 -1.4 37.1 18th 14.9 -0.4 10.2 12th 76.6 59.3 high 129%
    Canterbury Racecourse AWS 25.4 -1.3 34.5 19th 16.7 -0.2 12.8 30th 89.2 65.1 high 137%
    Cooranbong (Lake Macquarie AWS) 26.2 -1.3 34.9 18th 16.4 +0.4 11.6 15th 105.0 88.8 average 118%
    Gosford AWS 25.4   35.2 19th 17.0   12.2 6th 150.6
    Holsworthy Aerodrome AWS 26.6   38.0 18th 15.9   11.3 14th 60.4 56.2 average 107%
    Holsworthy Defence AWS 26.2   38.9 18th 15.1   10.9 14th 107.6
    Horsley Park Equestrian Centre AWS 26.7 -1.7 37.4 18th 15.9 -0.3 11.9 14th 78.8 66.2 average 119%
    Katoomba (Farnells Rd) 22.0 -0.5 30.7 21st 11.6 -0.2 7.0 29th 143.7 121.6 average 118%
    Mangrove Mountain AWS 26.9 +0.4 35.7 18th 14.9 -0.5 10.9 10th 73.0 90.2 average 81%
    Mount Boyce AWS 21.8 -0.9 29.3 18th 11.4 -0.3 5.6 10th 129.4 85.9 high 151%
    Norah Head AWS 26.2 +1.1 34.2 19th 18.7 +0.2 14.5 10th 96.8 70.4 high 138%
    Parramatta North (Masons Drive) 26.4 -1.2 37.2 18th     13.0 29th 66.8 72.7 average 92%
    Penrith Lakes AWS 28.1 -1.6 38.2 18th 16.6 -0.5 12.2 10th 114.2 65.0 high 176%
    Richmond RAAF 26.9 -2.1 36.1 18th 15.4 -0.8 10.1 12th 75.4 69.6 average 108%
    Sydney (Observatory Hill) 26.1   34.6 19th 17.9   13.9 10th 132.8
    Sydney Airport AMO 25.6 -0.3 35.8 19th 17.8 +0.2 14.3 10th 81.2 72.9 average 111%
    Sydney Harbour (Wedding Cake West) 23.1 -0.5 34.4 19th 18.6 -0.3 14.4 11th
    Sydney Olympic Park AWS (Archery Centre) 26.4 -1.4 37.8 18th 17.1 -0.5 12.8 10th 63.8 77.8 average 82%
    Terrey Hills AWS 24.1 -1.5 34.0 19th 16.3 -0.4 12.2 10th 121.4 91.0 average 133%

    Daily maximum temperatures for December 2021
    12345678910111213141516171819202122232425262728293031
    Badgerys Creek AWS27.929.329.821.818.822.228.320.225.819.921.323.926.627.732.926.227.137.531.932.933.929.027.628.232.928.423.122.524.728.429.9
    Bankstown Airport AWS27.428.429.122.820.421.730.520.725.021.421.423.324.726.332.825.726.538.234.730.831.627.328.128.031.927.624.022.624.127.229.1
    Camden Airport AWS27.530.129.821.619.521.928.219.924.319.422.024.227.328.733.526.026.837.032.932.135.129.527.728.333.326.824.122.024.828.430.6
    Campbelltown (Mount Annan)26.829.229.921.519.021.429.120.725.019.722.323.826.627.733.326.227.037.132.332.434.228.527.727.633.026.924.022.124.428.530.0
    Canterbury Racecourse AWS26.026.729.021.819.422.228.320.623.022.221.621.722.224.329.224.225.233.934.528.528.325.427.326.129.626.122.421.623.526.027.3
    Cooranbong (Lake Macquarie AWS)24.625.630.822.121.622.529.222.524.924.021.023.124.424.928.424.425.534.934.530.131.728.026.527.328.828.422.122.523.625.527.3
    Gosford AWS25.425.430.020.920.022.229.220.123.922.420.421.523.224.429.124.424.935.035.228.329.827.225.626.428.826.921.720.623.125.426.7
    Holsworthy Aerodrome AWS26.827.729.521.819.221.429.220.324.920.921.122.424.426.333.125.425.938.033.530.431.927.127.428.032.227.523.723.323.427.429.5
    Holsworthy Defence AWS26.328.929.119.918.121.229.619.723.520.120.821.025.425.633.823.525.738.932.631.833.327.126.826.632.925.722.420.922.827.629.3
    Horsley Park Equestrian Centre AWS26.928.529.622.918.521.828.220.525.320.921.422.625.926.333.425.426.837.432.932.132.827.727.127.732.327.422.521.024.028.229.1
    Katoomba (Farnells Rd)21.024.027.021.019.714.922.914.712.015.019.323.024.627.021.722.830.024.026.730.728.023.923.026.021.614.514.819.023.025.0
    Mangrove Mountain AWS24.026.131.222.219.122.325.826.632.624.724.835.733.229.935.329.828.027.531.028.119.720.222.125.327.3
    Mount Boyce AWS22.724.626.823.012.314.121.215.619.210.113.919.522.924.226.523.124.029.322.825.928.928.925.025.327.923.413.615.418.822.824.8
    Norah Head AWS27.226.428.320.920.626.225.820.923.123.420.421.024.225.928.426.427.028.534.229.328.828.129.128.030.629.922.123.724.228.829.3
    Parramatta North (Masons Drive)25.028.330.019.019.421.727.020.524.320.321.522.825.026.234.025.826.537.234.730.032.327.026.827.531.626.724.021.024.427.530.6
    Penrith Lakes AWS27.730.331.721.918.322.229.220.426.521.421.425.428.729.034.127.828.838.234.234.335.131.228.429.733.628.123.522.925.529.431.3
    Richmond RAAF27.129.030.421.717.820.827.519.424.820.820.623.326.828.233.126.527.436.133.532.933.930.427.328.932.327.623.121.024.627.929.6
    Sydney (Observatory Hill)26.827.427.323.119.723.326.920.124.722.722.623.624.825.828.025.726.430.934.629.131.528.527.028.129.427.322.822.523.827.228.1
    Sydney Airport AMO27.327.328.021.020.523.428.719.222.322.120.220.822.124.329.924.726.231.935.829.229.226.627.426.430.324.521.721.323.926.829.4
    Sydney Harbour (Wedding Cake West)22.622.323.820.219.521.521.819.621.120.519.419.721.221.925.222.422.927.534.426.126.324.124.424.725.424.321.320.622.823.824.2
    Sydney Olympic Park AWS (Archery Centre)27.227.229.621.819.722.128.620.524.222.321.622.524.225.231.125.726.337.834.529.331.026.928.027.231.226.823.022.124.226.528.6
    Terrey Hills AWS24.325.227.920.018.420.426.318.722.620.420.120.821.322.928.122.723.632.334.026.728.925.224.425.527.824.920.719.421.724.525.9
    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 2021
    12345678910111213141516171819202122232425262728293031
    Badgerys Creek AWS18.814.814.717.114.713.714.916.614.911.912.911.414.511.212.916.316.515.519.716.316.819.519.018.716.918.415.914.211.611.713.0
    Bankstown Airport AWS19.416.116.617.816.514.916.617.716.313.414.013.216.013.014.418.818.017.321.319.020.020.520.619.318.819.017.415.413.613.615.6
    Camden Airport AWS18.615.115.016.715.013.814.916.815.311.613.211.114.810.812.816.217.015.419.715.517.318.319.418.917.218.316.014.612.410.912.7
    Campbelltown (Mount Annan)18.814.614.816.814.713.814.416.415.210.511.510.214.110.712.515.616.515.419.415.816.617.219.418.316.717.515.613.911.111.613.0
    Canterbury Racecourse AWS18.915.916.317.916.014.416.217.316.113.414.014.616.012.913.819.617.916.221.117.819.421.020.819.418.718.118.115.813.912.814.7
    Cooranbong (Lake Macquarie AWS)17.517.314.419.015.715.216.816.715.812.515.514.512.512.311.619.318.114.420.818.221.722.321.217.217.416.217.815.714.813.112.7
    Gosford AWS18.216.616.618.617.012.217.216.916.613.715.715.115.613.413.520.218.916.221.218.621.522.121.218.918.618.117.915.614.413.414.7
    Holsworthy Aerodrome AWS19.115.615.817.215.514.615.917.015.712.211.712.214.811.313.416.616.520.417.818.119.820.018.717.719.716.814.913.012.014.3
    Holsworthy Defence AWS18.314.415.116.114.413.815.115.914.811.611.811.113.810.912.816.216.215.819.316.515.619.019.317.717.517.915.614.011.811.813.8
    Horsley Park Equestrian Centre AWS18.816.116.117.314.613.115.116.915.212.013.413.215.111.913.417.417.216.120.117.218.920.519.718.417.818.915.813.913.012.614.3
    Katoomba (Farnells Rd)11.913.914.07.57.69.812.611.07.67.59.210.313.613.710.112.215.513.614.816.115.014.614.214.49.57.67.09.211.5
    Mangrove Mountain AWS16.215.915.316.813.111.415.416.114.510.913.411.410.911.312.417.515.714.919.017.218.519.919.316.917.416.014.513.711.411.812.4
    Mount Boyce AWS13.511.714.514.37.87.610.712.410.25.66.96.79.110.514.114.010.212.514.612.915.015.815.314.713.615.09.67.67.58.711.7
    Norah Head AWS19.119.118.618.817.917.018.617.816.714.516.015.315.315.516.720.320.119.121.421.223.022.523.021.021.321.119.518.015.317.219.2
    Parramatta North (Masons Drive)19.019.017.014.013.013.515.0
    Penrith Lakes AWS19.116.616.918.115.314.916.217.915.812.213.112.715.613.214.718.117.217.120.817.717.921.520.420.319.019.916.914.312.514.015.0
    Richmond RAAF18.614.615.517.114.313.615.116.415.011.113.110.114.411.713.217.516.915.619.816.717.120.919.518.618.018.215.713.310.711.813.0
    Sydney (Observatory Hill)19.318.318.517.916.816.717.517.516.213.914.115.116.214.916.320.018.419.021.420.421.221.321.019.820.720.418.416.114.915.717.6
    Sydney Airport AMO18.619.019.117.516.416.217.917.016.014.314.415.515.915.717.219.717.619.521.320.321.021.219.420.520.316.114.816.118.7
    Sydney Harbour (Wedding Cake West)18.919.119.018.216.717.318.617.616.714.614.415.916.816.618.020.619.119.921.721.122.221.920.820.321.021.819.417.615.816.219.1
    Sydney Olympic Park AWS (Archery Centre)19.316.717.918.115.814.716.317.616.212.814.214.716.313.515.119.618.517.320.918.320.421.521.019.519.218.918.415.613.214.115.5
    Terrey Hills AWS18.016.517.316.614.413.915.915.714.812.212.913.414.412.914.718.416.817.021.019.519.819.520.018.119.218.816.314.112.514.416.9
    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 2021
    12345678910111213141516171819202122232425262728293031
    Abbotsbury (Fairfield (City Farm)) - - - - - - - 1.0 4.0 41.0 9.0 - - - - 3.0 - - 6.0 - - - 7.0 - 1.0 - - 9.0 - - -
    Abbotsford (Blackwall Point Rd) 0.2 - - 0.4 3.0 0.4 - 17.0 6.0 15.0 30.0 - - - - 4.0 - - 7.0 0.4 - - 2.0 0.4 - - 1.1 13.8 1.0 1.0 -
    Audley (Royal National Park) 1.0 - - 1.0 2.0 - - - 4.0 8.0 47.0 - - - - 5.0 - - 8.0 - - - 1.0 16.0 - - - 16.0 - - -
    Badgerys Creek AWS 0.2 - - - 1.0 - 0.4 4.0 4.6 43.4 6.0 0.2 - - - 2.2 0.2 - 12.0 - 0.2 - - - - 7.8 0.4 13.8 0.2 - -
    Bankstown Airport AWS 0.2 0.2 - - - - - - 5.8 20.6 13.2 - - - - 3.6 - - 9.6 - - - 1.4 0.2 - - - 13.6 0.4 0.2 -
    Baulkham Hills Eucalyptus Ct - - - 0.5 1.0 0.5 - 1.0 9.0 23.0 6.0 - - - - 3.0 - - 3.5 0.5 - - 1.5 2.0 - - - 18.0 - - -
    Belrose (Evelyn Place) 1.6 - - - 2.0 1.2 - 2.6 11.8 29.2 9.0 0.4 - - - 1.6 - - 1.2 7.6 - - 10.0 5.8 - - 3.6 29.0 27.8 2.0 -
    Bilpin Post Office 1.0 - - 3.0 - 12.0 1.6 8.6 17.2 - 12.2 - - - - - 10.2 - - 2.2 - - 11.2 7.8 - - 2.2 - 28.8 - -
    Blackheath (Wombat Street) 1.0 - 3.0 - 8.0 10.0 2.0 3.0 21.0 32.0 7.0 - - - - 1.0 2.0 - 13.0 3.0 - - 3.0 2.0 - 11.0 5.0 13.0 - - -
    Box Hill (McCall Gardens) - - - 1.0 1.0 2.0 - 2.0 12.0 21.0 3.0 - - - - 1.0 - - 10.0 1.0 - - - 5.0 - - - 8.0 - - -
    Bringelly (Maryland) 1.0 - - 1.0 - - - 2.0 3.0 43.0 11.0 - - - - 1.0 - - 9.0 - - - - - - - - 5.0 - - -
    Camden (Brownlow Hill) 1.2 - - 1.2 - - - 0.8 4.2 13.0 2.0 - - - - 2.6 - - 1.6 2.2 - - - - - 11.0 1.7 5.8


    Camden Airport AWS 1.0 - - 5.0 - - - 0.2 4.2 30.4 14.4 - - - - 4.0 - - 2.4 2.2 - - - - - 0.6 1.4 9.0 - - -
    Campbelltown (Kentlyn (Georges River Roa - - - 2.0 - - - - 3.0 29.0 71.0 - - - - 7.0 - - 3.0 - - - 6.0 - - - - 9.0 - - -
    Campbelltown (Mount Annan) 0.4 0.2 - 4.2 0.2 - 0.4 - 3.6 21.2 24.4 - - - - 6.2 0.2 - 5.0 0.8 - - 1.4 - - - 1.0 7.4 - - -
    Canterbury Racecourse AWS 1.4 0.2 - - 0.4 0.2 - 0.6 5.4 18.8 21.0 0.2 - - - 4.4 - - 11.2 - - - 1.6 0.4 - - 1.0 17.4 2.6 2.4 -
    Castle Cove (Rosebridge Ave) 1.8 - - 0.5 1.2 1.0 - 4.0 8.0 23.0 9.0 - - - - 2.5 - - 5.0 5.0 - - 8.5 3.5 - - 2.5 21.0 33.0 8.5
    Centennial Park 1.6 - - 0.4 1.0 - - 12.0 8.0 26.2 18.0 1.8 4.6 - - 0.6 - - 2.4 0.2 - - 24.4 11.6 - - 6.0 11.2 14.0 - -
    Chatswood Bowling Club 1.0 - - - 1.0 1.0 - 1.0 10.0 18.0 8.0 1.0 - - - - - - 3.0 - - - 6.0 - - - 3.0 17.0 9.0 3.0 -
    Collaroy (Long Reef Golf Club) 2.4 - - - 1.4 1.6 - 1.8 8.4 8.8 5.4 - - - - 0.4 1.2 - 4.8 5.2 - - 20.2 6.8 - - 0.8 7.2 9.6 1.2
    Colo Heights (Mountain Pines) 0.4 2.6 - - 8.2 6.4 1.4 26.4 30.0 32.2 2.4 0.4 - - - 5.6 2.4 - - 2.0 - - 0.2 10.0 - - 1.0 19.8 6.0 - -
    Concord (Brays Rd) - - - 0.2 3.6 0.4 - 7.0 6.8 18.2 22.6 - - - - 2.8 0.2 - 8.2 0.2 - - 1.8 0.4 1.0 13.8 0.8 0.8
    Concord Golf Club - - - - 2.8 - - 7.2 4.0 22.0 17.2 - - - - 4.2 - - 20.6 - - - 1.0 - - - 1.0 14.4 - 0.6
    Cooranbong (Avondale) - 1.0 - - 1.0 - - 5.0 10.0 21.0 - - - - - - - - - 2.0 - - 3.0 7.0 - - 18.0 28.0 4.0 - -
    Cooranbong (Lake Macquarie AWS) - 0.8 0.2 - 1.2 0.4 - 5.4 10.0 21.8 - - - - - 0.2 0.8 - - 2.0 - - 3.0 7.0 - - 18.2 29.0 5.0 - -
    Darkes Forest (Kintyre) 1.0 - - 2.0 8.0 1.0 - - 5.0 19.0 20.0 - - - - 6.0 - - 2.0 - - - 5.0 - - 6.0 1.0 59.0 - - -
    Dover Heights (Portland St) 3.1 - - - 2.8 0.2 - 9.6 9.4 28.6 19.6 2.6 - - - 3.4 - - 3.4 - - - 14.4 18.4 - - 3.4 13.4 7.0

    Erskine Park Reservoir - - - - 1.0 - - 4.0 6.0 33.0 6.0 - - - - - - - 10.0 - - - - 1.0 - - - 15.0 - - -
    Faulconbridge (Great Western Hwy) 1.0 - - 17.0 3.0 5.0 - 5.0 10.0 34.0 1.0 - - - - 2.0 1.0 - 3.0 1.0 - - 2.0 2.0 - - 2.0 26.0 - - -
    Faulconbridge (St Georges Crescent) 1.4 - - 8.2 2.6 3.6 0.8 6.0 9.2 19.2 1.2 - - - - 3.0 1.8 - 3.0 0.6 - - 2.2 2.6 - - 2.4 20.4 - - -
    Gears (Wyong River)


    - 1.0 - - 4.0 7.0
    - - -












    3.0 13.0 5.0

    Gosford AWS 0.8 - - - 0.4 - - 12.0 5.6 52.6 0.2 0.4 - - - 2.8 - - 0.6 - - - 9.4 16.4 - - 13.8 22.6 13.0 - -
    Holsworthy Aerodrome AWS - - - 0.8 - - - - 2.0 19.8 26.6 - - - - 1.6 - - 1.6 - - - 2.4 - - - - 4.8 - 0.8 -
    Holsworthy Defence AWS - 0.2 - 8.0 - - 0.2 - 3.2 28.2 38.0 - - - - 3.4 0.2 - 4.6 - 0.2 - 11.2 - - - - 9.8 0.2 0.2 -
    Hornsby (Swimming Pool) 1.4 - - 0.2 1.2 0.2 0.2 3.2 15.2 25.4 6.0 - - - - 1.6 - - 2.6 2.0 - - 2.6 14.4 - - 5.8 16.2 2.4 0.4 -
    Horsley Park Equestrian Centre AWS 0.4 - - - 0.2 - - 0.6 4.8 28.0 8.2 - - - - 4.0 - - 9.4 - - - 6.4 1.2 - - - 15.6 - - -
    Katoomba (Farnells Rd) - - - 6.0 17.2 11.0 1.0 1.4 10.2 6.4 0.9 - - - - 13.8 - 8.4 1.0 - - 0.4 10.4 - 7.4 10.4 37.4 0.4 - -
    Kurrajong Heights (Bells Line of Road) 3.0 - - 7.4 3.6 8.8 - 23.0 18.6 1.6 0.3 - - 3.2 - 1.2 0.5 - - 22.0 0.7 - - 1.0 27.4 0.2 - -
    Lucas Heights (ANSTO) - - - 2.0 - - - - - - 30.8 0.4 - - - 3.5 - - - - - - - - - - 4.0 14.0


    Mangrove Mountain AWS 4.2 - - 1.0




    13.8 0.2 - - - - 2.4 0.2 - 17.6 0.6 - - - - - - 8.8 12.4 11.8 - -
    Marrickville Golf Club - - - - 1.0 - - 1.0 5.0 17.0 13.0 - - - - 5.0 - - 12.0 - - - 7.0 - - - 1.0 25.0 4.0 - -
    Menangle Bridge (Nepean River) 1.0 - - 14.0 - - - - 7.0 25.0 17.0 - - - - 8.0 - - 2.0 - - - - - - - 2.0 6.0 - - -
    Mona Vale Golf Club 2.0 - - - 1.0 2.0 - 2.4 10.8 11.0 1.6 0.6 - - 0.2 1.4 0.2 - 0.4 1.6 0.2 - 28.6 4.2 0.2 - 5.4 17.6 8.4 - -
    Mount Boyce AWS 0.2 0.8 3.0 - 7.0 9.6 1.8 2.4 18.2 34.0 5.0 - 0.2 - - 1.6 0.8 0.2 10.6 1.4 - - 3.2 0.8 0.2 11.6 4.4 11.8 0.2 0.2 0.2
    Mount Wilson (Clarine) - - - 2.4 9.0 10.8 2.8 4.8 12.2 18.0 1.2 - - - - - 3.8 - 3.0 - - - 8.6 22.0 - 24.0 7.0 22.0 - - -
    Norah Head AWS 0.2 - 0.2 0.2 0.4 - - 33.6 11.2 15.4 0.2 2.4 1.2 - - 1.8 0.2 - 2.8 0.2 0.2 - - - - - 15.8 6.8 4.0 - -
    North Parramatta (Burnside Homes) - - - 0.5 1.5 0.5 - 1.0 9.0 19.5 10.5 - - - - 2.5 - - 2.5 - - - 0.5 1.0 - - 0.5 17.0 - - -
    North Rocks (Muirfield Golf Club) 1.0 - - 1.5 2.5 - 0.5 1.0 8.0 25.5 8.5 - - - - 1.5 - - 7.0 - - - 0.5 1.0 - - 0.5 11.5 0.5 - -
    North Ryde Golf Club 1.0 - - - 1.0 - 1.0 1.0 11.0 18.0 13.0 - - - - 2.0 - - 7.0 - - - 4.0 1.0 - - 1.0 11.0 2.0 - -
    Palm Grove (Lyrebird Lane) 2.0 - - 4.0 2.0 2.0 - 9.0 22.0 10.0 1.0 - - - - 2.0 - - - 1.0 - - 9.0 2.0 - - 4.0 20.0 15.0 1.0 -
    Parramatta North (Masons Drive) 0.4 - - 0.2 1.6 0.6 - 1.0 9.2 20.6 11.0 - - - - 2.8 - - 3.6 0.4 - - 0.8 1.2 - - 0.6 12.2 0.6 - -
    Peakhurst Golf Club - - - - - - - - 4.0 12.0 13.0 - - - - 1.0 - - 2.0 - - - 1.0 4.0 - - - 23.0 1.0 1.0 -
    Penrith Lakes AWS - - - 13.2 1.2 0.4 - 15.6 11.4 35.8 8.4 - - - - 2.0 - - 12.4 - - - - 1.8 - - - 12.0 - - -
    Prospect Reservoir - - - - - - - 1.0 7.0 45.0 7.0 - - - - 4.0 - - 8.0 1.0 - - 5.0 1.0 - - - 17.0 - - -
    Putty (The Gibba) - - - 2.0 4.0 4.0 1.0 3.0 14.0 3.0 - - - - - 1.0 1.0 - - 1.0 - - 1.0 1.0 - - 1.0 18.0 3.0 - -
    Randwick (Randwick St) 3.0 - - 0.6 1.8 - - 9.0 11.6 28.0 14.6 2.4 - - - 5.6 - - 2.0 0.6 - - 21.0 25.8 - - 5.4 14.2 11.2 2.6 -
    Richmond RAAF - - - 8.8 0.4 2.0 0.2 1.2 12.2 13.4 3.4 - - - - 1.8 - - 7.8 1.2 - - 6.2 7.0 - - - 9.8 - - -
    Rose Bay (Royal Sydney Golf Club) 3.1 - - - 3.0 0.1 - 8.2 13.8 25.1 16.8 3.0 - - - 4.2 0.2 - 4.2 - - - 14.2 10.3 - - 3.4 14.8 7.2 2.0 -
    Rossmore (South Creek) - - - - - - - 1.0 3.0 40.0 32.0 - - - - 3.0 - - 8.0 - - - 5.0 - - - - 13.0 - - -
    Sans Souci (Public School) 1.0 - - - - - - - 2.0 16.0 8.0 - - - - - - - 3.0 - - - 2.0 30.0 - - - - - - -
    Seven Hills (Radio FM 103.2) - - - - - - - 1.0 8.0 26.5 6.0 - - - - 0.5 0.5 - 4.5 - - - 1.5 1.5 - - - 13.5 - - -
    Shanes Park (South Creek Road) - - - 5.2 1.4 - 0.2 14.2 10.6 16.8 10.0 - - - - 0.6 - - 12.0 - - - 1.6 1.8 - - - 12.0 - - -
    Sydney (Observatory Hill) 1.0 - 0.4 0.2 0.4 1.0 - 15.4 14.2 18.4 10.0 0.4 - - - 6.2 - - 3.4 0.2 - - 18.0 10.6 - - 5.0 18.0 5.4 4.6 -
    Sydney Airport AMO 1.2 0.2 - - 0.8 0.6 - 1.4 2.6 17.2 10.8 - - - - 4.0 0.6 - 3.4 0.2 0.2 - 5.0 3.2 0.2 - 2.6 15.4 7.6 4.0 -
    Sydney Botanic Gardens 1.8 0.4 0.2 0.2 1.2 - 14.8 14.4 14.8 23.0 10.8 1.0 - - - 5.8 - - 4.3 0.4 - - 18.1 7.8 - - 5.3 22.0 7.8 9.2 -
    Sydney Olympic Park AWS (Archery Centre) 0.2 0.2 - - 0.8 0.2 - - 5.8 19.8 8.8 - - - - 3.0 - - 8.0 - - - 1.4 1.0 - - 0.2 13.8 0.4 0.2 -
    Terrey Hills AWS 1.4 - - - 2.4 3.0 - 1.6 10.6 29.4 6.0 0.4 - - - 1.2 - - 0.6 3.4 - - 8.0 2.0 0.2 - 6.8 27.8 16.0 0.6 -
    Wahroonga (Ada Avenue) 1.4 0.2 - 0.8 1.4 - 0.4 2.8 15.6 29.2 9.6 - - - - 0.8 - - 2.4 2.0 - - 3.6 13.0 - - 4.2 18.2 4.4 1.2 -
    Warragamba - - - 3.0 1.0 2.0 - 5.0 5.0 14.0 2.0 - - - - 1.0 - - 4.0 - - - - 2.0 - - 3.0 8.0 - - -
    Wedderburn (Booalbyn) 2.0 - - 1.0 - - - - 7.0 29.0 30.0 - - - - 4.0 - - 2.0 - 1.0 - - 1.0 - 1.0 - 11.0 - - -
    Wyong (Kulnura (Jeavons)) 2.0 1.0 - - 1.0 2.0 1.0 5.0 11.0 14.0 - - - - - 1.0 - - 5.0 - - - - - - - 8.0 14.0 13.0 - -
    Wyong (Mount Elliot) 1.0 - - 1.0 1.0 1.0 - 6.0 8.0 52.0 - - - - - 2.0 - - 1.0 - - - 17.0 24.0 - - 11.0 40.0 16.0 - -
    Wyong (Olney Forest) 4.0 1.0 - - 5.0 4.0 1.0 2.0 12.0 26.0 - - - - - - 1.0 - - 1.0 - - - 6.0 - - 3.0 29.0 9.0 - -
    Yarramalong (Lewensbrook) 3.0 - - - 1.0 0.4 1.0 6.0 7.0 15.0 - - - - - 0.4 - - 1.0 - - - - 1.0 - - 5.4 19.0 11.6 - -
    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 2 pm on Wednesday 5 January 2022. 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

    Media
    (03) 9669 4057

Climate