Sydney in July 2015: A cool month with snow in the Blue Mountains

Temperatures were below average across Sydney during July, with the coolest mean minimum temperatures at Observatory Hill since 2002. Rainfall was also average to below average, while two cold snaps caused snow in the Blue Mountains.

  • Coolest mean minimum temperatures since 2002
  • Most cold nights since 2002
  • Cold snaps cause snow in the Blue Mountains

Rainfall was average to below average across Sydney during July, with Observatory Hill recording half its historical average rainfall. The rain fell over 13 days, close to the July average of 11 days, but only one day recorded more than 10 mm. The heaviest rain was associated with an east coast low on the 17th, with 17.2 mm recorded at Observatory Hill and 26.4 mm at Canterbury. An east coast low to the south of the city also caused totals of up to 16 mm at Campbelltown on the 12th.

Both these events were associated with very cold conditions and produced snow in the Blue Mountains, with 15 cm of snow reported at Oberon and 19 cm at Blackheath on the 17th. This is the heaviest snow in the Blue Mountains since 15-20 cm fell during an east coast low in October 2012.

Minimum temperatures were below average across the city, with Observatory Hill recording its coolest July nights since 2002. The month was notable for the persistence of cool nights, with Observatory Hill recording minimum temperatures of 8 °C or lower on 18 nights. This is close to the historical average of 16 nights, but the most cold nights since July 2002. There were 11 consecutive nights below 8 °C between the 2nd and 12th, the longest cold spell since 14–24 July 1989.

Maximum temperatures were also below average across most of the city, including the coolest July since 1998 at Richmond. In contrast, maximum temperatures were above average at Observatory Hill, with only four days below 15 °C (average 9 days), notably between the 16th and 18th, while five days reached at least 20 °C (average 2 days). On average there were 6.9 hours of bright sunshine per day during the month, slightly above the July average of 6.6 hours.

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Extremes in July 2015
Hottest day 21.6 °C at Sydney Airport AMO on the 25th
21.6 °C at Sydney Airport AMO on the 26th
Warmest days on average 17.4 °C at Sydney (Observatory Hill)
Coolest days on average 15.1 °C at Springwood (Valley Heights)
Coldest day 10.2 °C at Campbelltown (Mount Annan) on the 16th
Coldest night -2.6 °C at Camden Airport AWS on the 6th
Coolest nights on average 2.0 °C at Camden Airport AWS
Warmest nights on average 8.0 °C at Sydney (Observatory Hill)
Warmest night 11.6 °C at Sydney Airport AMO on the 23rd
11.6 °C at Sydney (Observatory Hill) on the 24th
Warmest on average overall 12.7 °C at Sydney (Observatory Hill)
Coolest on average overall 9.3 °C at Camden Airport AWS
Wettest overall 67.1 mm at Randwick (Randwick St)
Driest overall 22.4 mm at Camden Airport AWS
Wettest day 26.4 mm at Canterbury Racecourse AWS on the 17th
Strongest wind gust 78 km/h at Kurnell AWS on the 13th

Record lowest July daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
July
Canterbury Racecourse AWS 12.0 on the 16th 12.1 on the 2nd in 2003 20 17.5

Lowest July mean temperature for at least 20 years
Observed
(°C)
Most recent
lower
Average for
July
Camden Airport AWS 9.3 8.9 in 1983* 10.1
Prospect Reservoir 10.9 10.2 in 1995 11.5

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


Summary statistics for July 2015
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
July
2015
Diff
from
average
Highest for
July
2015
Mean for
July
2015
Diff
from
average
Lowest for
July
2015
Total for
July
2015
Average
for
July
Rank of
July
2015
Fraction of
July
average
Badgerys Creek AWS 16.2 -1.1 19.8 25th 3.5 -0.7 -1.3 6th 36.0 23.7 high 152%
Bankstown Airport AWS 17.0 -0.2 20.5 26th 4.5 -0.6 0.6 4th 44.8 44.1 average 102%
Camden Airport AWS 16.5 -0.8 20.1 26th 2.0 -1.0 -2.6 6th 22.4 36.8 average 61%
Campbelltown (Mount Annan) 16.4   20.0 26th 2.9   -1.6 4th 28.4
Canterbury Racecourse AWS 16.2 -1.3 19.6 31st 4.6 -1.2 0.2 15th 53.2 57.6 average 92%
Holsworthy Aerodrome AWS 16.4   19.9 25th 4.2   -0.5 4th 34.4
Horsley Park Equestrian Centre AWS 16.4 -0.8 19.7 31st 4.8 -1.1 0.2 4th 34.8 38.3 average 91%
Parramatta North (Masons Drive) 16.8 -0.6 20.2 31st 5.5 -0.7 1.8 4th 37.8 45.5 average 83%
Penrith Lakes AWS 17.0 -0.8 20.4 26th 4.7 -0.7 0.4 6th 33.4 29.8 average 112%
Prospect Reservoir 16.4 -0.4 20.0 25th 5.4 -0.7 1.3 4th 35.5 56.1 average 63%
Richmond RAAF 16.8 -0.8 20.6 26th 3.4 -0.2 -2.5 6th 24.2 28.3 average 86%
Springwood (Valley Heights) 15.1   19.3 30th 5.4   1.5 15th 30.6 55.5 average 55%
Sydney (Observatory Hill) 17.4 +1.1 21.0 31st 8.0 -0.1 5.8 4th 47.0 97.0 average 48%
Sydney Airport AMO 17.2 +0.2 21.6 26th 7.9 +0.7 5.0 4th 45.4 69.6 average 65%
Terrey Hills AWS 15.6 -0.4 19.1 24th 6.5 -1.1 2.6 4th 15.0 60.7 low 25%

Daily maximum temperatures for July 2015
12345678910111213141516171819202122232425262728293031
Badgerys Creek AWS15.315.715.416.417.016.014.816.116.211.918.313.515.916.715.811.813.214.216.417.617.115.117.718.219.818.414.216.217.619.219.7
Bankstown Airport AWS16.216.015.816.517.516.815.015.817.514.119.114.316.816.816.312.314.314.716.617.118.917.718.319.920.320.514.917.617.920.320.0
Camden Airport AWS15.815.415.416.317.916.015.616.216.612.218.014.616.715.915.811.114.415.116.517.518.015.518.518.219.820.114.417.117.419.319.9
Campbelltown (Mount Annan)16.215.615.116.417.515.615.715.916.412.418.113.716.415.715.710.214.515.517.017.417.915.118.317.819.620.014.117.517.418.619.7
Canterbury Racecourse AWS15.815.514.215.317.715.914.314.516.714.818.213.916.516.215.612.013.914.015.215.818.516.317.818.919.419.614.317.017.119.119.6
Holsworthy Aerodrome AWS16.315.615.516.017.216.215.315.216.713.318.214.216.516.215.310.714.014.215.816.918.216.717.518.419.919.614.417.117.619.419.8
Horsley Park Equestrian Centre AWS15.515.815.615.916.816.415.015.816.512.518.313.116.416.415.812.013.414.617.017.017.516.218.419.119.719.714.716.817.219.419.7
Parramatta North (Masons Drive)16.716.216.215.817.516.514.316.217.314.318.813.817.217.316.212.814.014.316.516.919.016.517.319.520.219.815.317.218.019.820.2
Penrith Lakes AWS16.117.115.815.816.016.516.916.517.012.919.215.017.217.615.813.114.615.217.117.018.614.917.720.220.320.415.917.117.920.020.3
Prospect Reservoir15.815.415.215.216.616.114.915.716.413.018.713.815.816.215.712.313.514.316.617.218.116.917.619.220.019.614.617.217.419.819.5
Richmond RAAF15.617.215.514.916.216.716.015.916.611.818.614.617.917.215.812.914.615.717.217.518.715.717.420.620.320.615.917.417.120.020.2
Springwood (Valley Heights)15.015.013.113.515.115.615.114.014.712.317.212.014.815.613.510.712.713.314.515.017.115.816.518.018.518.014.215.615.419.318.1
Sydney (Observatory Hill)17.516.416.216.118.617.314.716.517.616.919.915.116.917.616.813.414.314.616.717.919.316.919.120.020.820.215.717.318.420.521.0
Sydney Airport AMO17.917.214.116.418.517.414.214.617.415.920.015.417.718.016.113.413.813.314.515.620.118.516.220.821.621.616.117.317.020.721.5
Terrey Hills AWS15.314.713.514.716.715.214.313.615.618.017.713.215.915.713.911.311.713.214.814.917.715.517.119.118.618.613.515.415.618.718.7
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 July 2015
12345678910111213141516171819202122232425262728293031
Badgerys Creek AWS6.92.63.8-1.10.0-1.32.92.81.62.30.55.14.82.8-0.15.05.15.04.64.43.34.87.710.77.73.02.02.22.51.84.8
Bankstown Airport AWS8.62.44.00.62.31.03.24.93.12.32.46.16.84.41.46.56.02.45.65.94.35.18.88.26.64.33.71.85.13.67.1
Camden Airport AWS6.31.30.9-2.2-1.2-2.61.2-1.1-0.20.6-0.53.91.63.9-1.04.05.01.62.31.91.63.27.49.36.40.34.71.30.20.82.1
Campbelltown (Mount Annan)8.21.30.5-1.60.0-1.22.81.01.71.40.24.52.75.5-0.45.65.02.13.72.93.34.27.78.68.21.53.31.62.41.72.9
Canterbury Racecourse AWS8.41.94.81.72.40.33.66.42.02.22.25.86.95.60.24.55.45.75.95.43.84.98.38.65.04.56.22.84.83.88.4
Holsworthy Aerodrome AWS8.12.53.9-0.51.40.53.34.52.02.30.75.85.36.11.04.95.12.95.44.83.75.58.88.57.24.56.01.25.12.66.4
Horsley Park Equestrian Centre AWS7.32.64.80.20.71.01.95.43.53.73.26.36.13.81.96.65.05.17.86.93.56.29.19.49.29.31.91.23.63.67.7
Parramatta North (Masons Drive)8.23.03.61.85.03.24.35.34.24.03.85.86.27.83.56.25.24.35.85.34.47.09.79.39.39.73.53.04.34.610.2
Penrith Lakes AWS7.22.35.52.00.90.42.13.63.83.72.54.95.65.41.55.86.14.96.25.65.86.28.711.48.08.22.71.62.63.46.3
Prospect Reservoir7.82.65.61.31.51.73.14.83.93.94.56.66.47.23.26.55.84.06.56.14.47.29.69.89.010.82.92.63.85.28.8
Richmond RAAF7.11.60.80.0-1.2-2.50.21.81.51.82.84.05.95.30.05.76.01.44.54.94.64.98.39.69.35.73.2-0.40.02.36.0
Springwood (Valley Heights)7.92.53.81.63.23.15.34.85.26.25.15.05.97.41.55.83.55.15.45.36.67.29.28.39.28.23.83.95.35.56.2
Sydney (Observatory Hill)10.77.06.25.86.06.07.87.96.67.36.67.18.18.66.28.36.26.67.87.88.29.911.211.610.811.07.36.48.18.210.7
Sydney Airport AMO11.16.16.15.05.45.86.98.46.27.26.27.98.39.25.88.56.26.47.17.87.99.711.611.310.410.78.56.77.58.110.6
Terrey Hills AWS9.03.35.32.63.14.04.96.06.05.97.96.66.07.14.17.24.85.36.76.87.99.79.910.69.09.74.04.85.97.710.2
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 July 2015
12345678910111213141516171819202122232425262728293031
Abbotsbury (Fairfield (City Farm)) 3.0 - - - - - - - - - 2.0 8.0 4.0 - - 1.0 16.0 - - - - - 1.0 - - - - - - - -
Abbotsford (Blackwall Point Rd) 2.0 - - - - - - - - - 3.0 8.0 4.0 - - - 16.0 9.0 - - - - 5.0







Audley (Royal National Park) 1.0 - - - - - - 2.0 1.0 - 1.0 12.0 7.0 - - - 17.0 5.0 1.0 - 1.0 - 4.0 - - - - - - - -
Avalon (Wollstonecraft Ave) 1.0 - - - - - - 1.0 - - 1.0 1.0 -

















Avalon Beach (Avalon (Palmgrove Rd)) - - - - - - - - - - - - - - - - - - 6.8











Badgerys Creek AWS 0.8 - - - - - - - - - 1.6 12.6 1.0 - - 0.4 18.0 0.2 - - - - 1.4 - - - - - - - -
Bankstown Airport AWS 3.4 - - - - - - - - - 1.2 12.2 4.6 0.4 - - 16.6 1.6 - - - - 4.4 0.2 0.2 - - - - - -
Baulkham Hills Eucalyptus Ct 3.5 0.5 - - - - - 0.5 - - 1.5 14.0 4.5 - - 0.5 12.0 0.5 0.5 - - - 5.0 - - - - - - - -
Belrose (Evelyn Place) 1.6 - - - - - - 1.8 - - 1.6 3.2 5.2 0.4 - 0.2 15.0 9.8 0.2 - 0.2 - 3.8 0.2 0.4 - - - - - -
Berowra (Goodwyn Road) 1.8 - - - - - - 1.4 - - - 5.6 5.0 - - - 7.8 - 4.8 - - - - 4.6






Box Hill (Hynds Road) 3.0 - - - - 1.0 - - - - 1.0 12.0 3.0 - - 2.0 9.0 1.0 - - - - 2.0 - - - - - - - -
Camden Airport AWS 0.2 - 0.2 - - 0.2 - - - 0.2 2.6 7.4 0.4 - - - 10.0 0.2 - - - - 1.0 - - - - - - - -
Campbelltown (Kentlyn (Georges River Roa - - - - - 1.0 - - - - 2.0 16.0 6.0 - - - 12.0 1.0 - - - 1.0 1.0 - - - - - - - -
Campbelltown (Mount Annan) 0.4 0.2 - - 0.2 - - - - - 2.4 8.4 1.4 - - - 13.6 0.4 - 0.2 - - 1.0 0.2 - - - - - - -
Canterbury Racecourse AWS 2.2 0.2 - - - - - 0.4 - - 0.8 7.0 5.6 0.2 - - 26.4 5.0 0.2 - 0.6 0.2 3.6 0.8 - - - - - - -
Castle Cove (Rosebridge Ave) - - - - - - - 4.5 - - 1.5 3.5 5.0 - - 2.2 18.0 8.0 0.5 - - - 4.0







Castle Hill (Kathleen Ave) 2.8 - - - - - - - - - 2.0 13.0 4.6

















Chatswood Bowling Club 2.0 - - - - - - 1.0 - - 1.0 3.0 5.0 - - - 16.0 8.0 - - - - 3.0 - - - - - - - -
Collaroy (Long Reef Golf Club) 1.6 - - - - - - 3.6 - - 1.6 - 7.4 1.2 - 0.6 14.8 6.6 1.8 - 8.2 - 2.0







Concord (Brays Rd) 2.0 - - - - - - - - - 1.0 6.4 1.8 0.8 - - 12.4 9.2 0.2 - - - 4.0 2.2 0.2





Concord Golf Club - - - - - - - - - - 1.8 7.2 6.4 - - - 17.8 4.6 - - - - 5.2 0.4






Frenchs Forest (Frenchs Forest Rd) 1.0 - - - - - - 3.0 1.0 - 1.0 4.0 4.0 1.0 - 1.0 12.0 8.0 1.0 - - - 3.0 - - - - - - - -
Glenorie (Old Northern Rd) 3.0








3.0 5.0


5.0


1.0

5.0







Holsworthy Aerodrome AWS 1.0 0.2 - - - - - - - - 1.0 9.4 4.6 - - - 13.4 2.4 - - - - 2.4 - - - - - - - -
Horsley Park Equestrian Centre AWS 3.8 - - - - 0.2 - - - - 2.4 9.0 3.4 - - - 14.2 0.2 - - - - 1.4 0.2 - - - - - - -
Lucas Heights (ANSTO) - - - - - - - 0.4 - - 0.7 11.6 5.6 - - - 20.8 2.0 - - 0.2 - 4.4 0.2 - - - - - - -
Marrickville Golf Club 3.0 - - - - - - 2.0 - - 1.0 6.0 6.0 - - 1.0 21.0 8.0 - - 2.0 - 4.0 - - - - - - - -
Milperra Bridge (Georges River) 3.0 - - - - - - - - - 1.0 8.0 3.0 - - - 11.0 1.0 - - - - 4.0 - - - - - - - -
Mona Vale Golf Club 1.0 - - - 0.2 - - 2.6 - 0.4 4.4 4.2 4.8 0.6 - 0.6 11.0 6.0 1.0 0.2 2.0 - 3.2 - 0.6 - - - - 0.2 -
North Parramatta (Burnside Homes) 3.5 - - - - - - 0.5 - - 1.5 9.0 5.0 - - - 9.5 1.0 - - - - 8.0 - - - - - - - -
North Rocks (Muirfield Golf Club) 2.5 - - - - - - - 0.5 - 1.5 10.0 4.5 - - 0.5 11.0 1.0 - - - - 9.0 0.5 - - - - - - -
Parramatta North (Masons Drive) 3.4 - - - - - - 0.8 - - 2.0 6.0 5.0 - - - 11.4 1.2 0.2 - - - 7.6 0.2 - - - - - - -
Peakhurst Golf Club 4.0 - - - - - - 1.0 - - 1.0 12.0 5.0 - - - 17.0 3.0 - - - 1.0 4.0 1.0 - - - - - - -
Pennant Hills (Yarrara Road) 2.6 - - - - - - 0.6 - 0.2 1.4 5.6 5.4 0.2 - 0.2 14.0 2.2 0.2 - - - 5.4 0.8 - - - - - -
Penrith Lakes AWS 2.0 0.2 - - 0.2 0.2 - - 0.2 - 2.2 11.4 1.4 - - 1.2 12.8 0.2 - - 0.2 - 1.2 - - - - - - - -
Prospect Reservoir 4.6 - - - - - - 0.3 - - 2.0 7.1 5.0 0.1 - 0.2 12.4 0.8 0.2 - - - 2.8 - - - - - - - -
Randwick (Randwick St) 1.4 - - - - - - 14.6 0.8 - 0.6 2.2 4.2 0.8 - 1.8 19.0 11.0 3.4 1.0 4.8 - 1.4 - 0.1





Richmond - UWS Hawkesbury 1.8 0.1 - - - - - - - - 6.6 - - 5.0 7.8 - - - - - 1.2 - - - - - - - -
Richmond RAAF 2.6 0.2 0.2 - - 0.2 - - - - 1.2 5.6 1.0 - 0.2 3.0 8.0 - 0.2 - - - 1.8 - - - - - - - -
Rose Bay (Royal Sydney Golf Club) 0.8 - - - - - -























Rossmore (South Creek) - - - - - - - - 1.0 - 1.0 13.0 2.0 - - 1.0 12.0 - - - - - 1.0 - - - - - - - -
Sans Souci (Public School) 4.0 - - - - - - 4.0 - - 1.0 11.0 5.0 - - 1.0 15.0 6.0 - - 1.0 - 3.0 - - - - - - - -
Seven Hills (Radio FM 103.2) 3.0 - - - - - - - - - 1.5 13.0 3.5 0.5 - 0.5 11.5 0.5 - - - - 2.5 - - - - - - - -
Seven Hills (Collins St) 3.2








1.8 11.6
4.8

11.4 3.0




3.4






Springwood (Valley Heights) 0.4 - - - - - - - 0.2 - 1.6 11.2 0.6 0.2 - 1.2 13.6 0.4 - - 0.2 - 1.0 - - - - - - - -
St Ives (Richmond Avenue) 2.2








2.6 3.0 5.2


14.8 7.0



4.2







Strathfield Golf Club 3.0 - - - - - - - 1.0 - 1.0 9.0 5.0 1.0 - - 18.0 3.0 - - - - 6.0 - - - - - - - -
Sydney (Observatory Hill) 1.0 - - - - - - 5.6 - - 0.8 2.2 4.8 0.6 0.2 0.2 17.2 9.0 0.6 - 3.0 - 1.8 - - - - - - - -
Sydney Airport AMO 2.2 - - - - - - 3.4 0.2 - 0.2 7.4 3.4 0.6 - - 15.6 7.8 0.8 0.2 1.0 - 2.0 0.6 - - - - - - -
Sydney Botanic Gardens 1.0 - - - - - - 9.6 - - 0.8 2.8 6.6 0.4 - 6.2 17.0 1.2 - - 1.6 - 1.8 - - - - - - - -
Terrey Hills AWS 0.2 - - - - - - - - - - - - - -
7.4 3.2 0.2 - 1.4 - 2.2 0.2 0.2 - - - - - -
Turramurra (Kissing Point Road) 2.6





0.8

1.0
6.0 0.3

7.6 8.8 0.2


4.8
0.4




-
Willmot (Resolution Ave) 3.0 - - - - - - - - - 2.0 6.0 1.0 - - 1.0 8.0 1.0 - - - - 1.0 - - - - - - - -
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 lists the main features of the weather in Sydney using the most timely and accurate information available on the date of publication; it will generally not be updated. Later information, including data that has had greater opportunity for quality control, will be presented in the Monthly Weather Review.

A climate summary is generally published on the first working day of each month.

This statement has been prepared based on information available at 8 am on Monday 3 August 2015. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

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.

The ACORN-SAT dataset is used for temperature area averages.

Further information

Media
(03) 9669 4057
Enquiries