Sydney in July 2017: warm and dry, but cold nights in the west

Rainfall was below average across Sydney during July, with Observatory Hill recording its driest July since 1995. With clear skies throughout the month, daytime temperatures were warmer than average, while overnight temperatures were generally below average.

Dry across the city

  • Sydney had its driest July since 1995: Observatory Hill received only 12.6 mm across four days, much lower than the July average of 97.1 mm over 11 rain days
  • Western and northern Sydney were particularly dry, with some sites recording their lowest July rainfall totals on record
  • Parramatta North received only 0.2 mm across one rainday, well below the July average of 46.2 mm over 8.3 days
  • There were few significant rainfall events across the city for July: the highest daily total was 19.0 mm in Randwick on the 13th from coastal showers, much lower than the 116.0 mm which fell in one day in Western Sydney last month
  • The low rainfall totals also meant more sunshine: Sydney Airport recorded an average of 8.5 hours of sunshine per day, above the July average of 6.6 hours

A warm finish to July

  • Maximum temperatures were generally above average for July across the Sydney region: the mean daytime temperature at Observatory Hill was 19.1 °C, 2.7 °C above average and the second-warmest July on record
  • Observatory Hill recorded 10 days above 20 °C, above the July average of three days
  • Warm conditions at the end of the month saw many stations recording their warmest July day on record, including Observatory Hill where a top of 26.5 °C beat the previous record of 25.9 °C set on 24 July 1990
  • Overnight temperatures were closer to average tending to below average across the city, with colder conditions further inland: minimum temperatures for Parramatta North were 1.4 °C below average for the month

Further information

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Extremes in July 2017
Hottest day 28.2 °C at Penrith Lakes AWS on the 30th
Warmest days on average 19.4 °C at Sydney Airport AMO
Coolest days on average 17.2 °C at Terrey Hills AWS
Coldest day 11.4 °C at Penrith Lakes AWS on the 3rd
Coldest night -3.1 °C at Camden Airport AWS on the 23rd
Coolest nights on average 0.9 °C at Camden Airport AWS
Warmest nights on average 8.6 °C at Sydney (Observatory Hill)
Warmest night 15.6 °C at Sydney (Observatory Hill) on the 31st
Warmest on average overall 13.9 °C at Sydney (Observatory Hill)
Coolest on average overall 9.6 °C at Camden Airport AWS
Wettest overall 27.7 mm at Rose Bay (Royal Sydney Golf Club)
Driest overall 0 mm at Abbotsbury (Fairfield (City Farm))
0 mm at Holsworthy Aerodrome AWS
0 mm at Horsley Park Equestrian Centre AWS
0 mm at Milperra Bridge (Georges River)
0 mm at North Parramatta (Burnside Homes)
0 mm at North Rocks (Muirfield Golf Club)
0 mm at Rossmore (South Creek)
Wettest day 19.0 mm at Randwick (Randwick St) on the 13th
Strongest wind gust 81 km/h at Badgerys Creek AWS on the 26th

Record lowest July total rainfall
New record
(mm)
Old
record
Years of
record
Average for
July
Turramurra (Kissing Point Road) 0.4 0.8 in 1970 83 70.7
Pennant Hills (Yarrara Road) 1.4 1.6 in 1946 77 78.3
Chatswood Bowling Club 6.0 9.9 in 1951 28 79.3
Richmond RAAF 0.6 1.4 in 1995 24 28.4
Badgerys Creek AWS 0.4 2.8 in 2013 22 23.6
Penrith Lakes AWS 1.4 4.2 in 2013 22 29.3
Canterbury Racecourse AWS 6.6 10.0 in 2002 21 56.9
Horsley Park Equestrian Centre AWS 0.0 9.0 in 2014 20 37.5
St Ives (Richmond Avenue) 2.6 9.4 in 2013 20 66.7

Lowest July total rainfall for at least 20 years
Observed
(mm)
Most recent
lower
Average for
July
Lucas Heights (ANSTO) 0.4 0.3 in 1970 52.8
Parramatta North (Masons Drive) 0.2 0.0 in 1970 45.3
Bankstown Airport AWS 0.4 0.2 in 1977 43.9
Prospect Reservoir 0.4 0.0 in 1977 55.7
Richmond - UWS Hawkesbury 0.6 0.2 in 1977 44.4
Camden Airport AWS 1.6 0.2 in 1977* 36.2
Peakhurst Golf Club 1.0 0.8 in 1977* 45.9
Campbelltown (Kentlyn (Georges River Roa 1.0 0.4 in 1977* 33.2
Belrose (Evelyn Place) 6.8 3.0 in 1995 76.6
Sans Souci (Public School) 9.0 4.4 in 1995 86.5
Sydney (Observatory Hill) 12.6 5.4 in 1995 96.6
Avalon Beach (Avalon (Palmgrove Rd)) 7.4 1.8 in 1995* 70.3
Castle Cove (Rosebridge Ave) 7.5 3.6 in 1995* 70.4
Springwood (Valley Heights) 0.6 0.0 in 1995* 55.2
Sydney Botanic Gardens 14.8 1.5 in 1995* 97.6
Frenchs Forest (Frenchs Forest Rd) 11.0 3.8 in 1995* 68.1

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




Record highest July temperature
New record
(°C)
Old
record
Years of
record
Average for
July
Sydney (Observatory Hill) 26.5 on the 30th 25.9 on the 24th in 1990 159 16.4
Sydney Airport AMO 27.0 on the 30th = 27.0 on the 22nd in 2016 79 17.1
Prospect Reservoir 27.1 on the 30th 26.5 on the 24th in 1990 53 16.9
Parramatta North (Masons Drive) 26.8 on the 30th 25.9 on the 24th in 1990 51 17.4
Bankstown Airport AWS 26.8 on the 30th 26.7 on the 24th in 1990 49 17.3
Camden Airport AWS 27.0 on the 30th 26.0 on the 22nd in 2016 41 17.3
Richmond RAAF 27.9 on the 30th 25.7 on the 22nd in 2016 24 17.6
Badgerys Creek AWS 27.0 on the 30th 25.7 on the 22nd in 2016 22 17.3
Canterbury Racecourse AWS 26.1 on the 30th 25.5 on the 22nd in 2016 22 17.5
Penrith Lakes AWS 28.2 on the 30th 26.7 on the 22nd in 2009 22 17.7
Horsley Park Equestrian Centre AWS 27.3 on the 30th 25.5 on the 22nd in 2016 20 17.2



Record highest July mean daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
July
Richmond RAAF 19.0 18.9 in 2014 23 17.6



Lowest July mean daily minimum temperature for at least 20 years
Observed
(°C)
Most recent
lower
Average for
July
Bankstown Airport AWS 3.2 =3.2 in 1995 5.2



Summary statistics for July 2017
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
July
2017
Diff
from
average
Highest for
July
2017
Mean for
July
2017
Diff
from
average
Lowest for
July
2017
Total for
July
2017
Average
for
July
Rank of
July
2017
Fraction of
July
average
Badgerys Creek AWS 18.3 +1.0 27.0 30th 2.2 -2.0 -1.4 23rd 0.4 23.6 lowest 2%
Bankstown Airport AWS 18.9 +1.6 26.8 30th 3.2 -2.0 -0.9 23rd 0.4 43.9 v low 1%
Camden Airport AWS 18.2 +0.9 27.0 30th 0.9 -2.1 -3.1 23rd 1.6 36.2 v low 4%
Campbelltown (Mount Annan) 18.3 +0.9 27.1 30th 2.2 -1.7 -1.2 7th 1.4 26.7 v low 5%
Canterbury Racecourse AWS 18.6 +1.1 26.1 30th 4.1 -1.7 0.7 10th 6.6 56.9 lowest 12%
Holsworthy Aerodrome AWS 18.2   26.5 30th 3.2   -1.1 7th 0
Horsley Park Equestrian Centre AWS 18.2 +1.0 27.3 30th 4.8 -1.1 0.2 2nd 0 37.5 lowest 0%
Parramatta North (Masons Drive) 18.8 +1.4 26.8 30th 4.9 -1.4 1.0 22nd 0.2 45.3 v low 0%
Penrith Lakes AWS 18.9 +1.2 28.2 30th 3.9 -1.6 0.5 22nd 1.4 29.3 lowest 5%
Prospect Reservoir 18.4 +1.5 27.1 30th 5.3 -0.8 1.0 22nd 0.4 55.7 v low 1%
Richmond RAAF 19.0 +1.4 27.9 30th 2.0 -1.7 -2.1 22nd 0.6 28.4 lowest 2%
Springwood (Valley Heights) 17.3 +1.4 25.9 30th 6.9 +0.5 3.5 1st 0.6 55.2 v low 1%
Sydney (Observatory Hill) 19.1 +2.7 26.5 30th 8.6 +0.5 5.4 2nd 12.6 96.6 low 13%
Sydney Airport AMO 19.4 +2.3 27.0 30th 8.1 +0.9 4.9 2nd 17.2 69.6 low 25%
Terrey Hills AWS 17.2 +1.2 23.6 30th 7.4 -0.2 3.3 22nd 4.8 59.0 v low 8%

Daily maximum temperatures for July 2017
12345678910111213141516171819202122232425262728293031
Badgerys Creek AWS15.415.913.121.620.417.918.717.117.316.818.116.616.917.718.316.517.022.816.816.716.717.321.520.420.020.717.619.119.127.015.0
Bankstown Airport AWS16.316.414.322.120.317.818.917.917.517.419.316.017.619.918.717.318.223.717.716.817.418.721.820.620.421.219.419.120.226.815.3
Camden Airport AWS16.116.112.821.419.917.718.418.317.117.117.817.017.318.118.516.417.422.716.315.316.618.221.519.620.820.017.718.319.427.014.8
Campbelltown (Mount Annan)16.416.013.821.420.017.618.217.117.017.018.017.017.118.618.416.617.922.316.315.316.917.821.519.620.620.018.118.319.327.114.8
Canterbury Racecourse AWS15.617.214.722.019.917.918.417.717.417.117.415.017.319.918.317.518.323.017.116.716.418.821.720.120.521.118.419.020.226.115.9
Holsworthy Aerodrome AWS15.816.012.721.519.717.618.017.117.217.317.315.617.019.218.416.817.422.317.416.216.717.521.520.420.820.317.918.319.326.514.9
Horsley Park Equestrian Centre AWS15.215.413.421.020.117.316.617.616.516.818.717.916.416.723.016.516.616.317.321.220.319.820.517.518.919.327.315.3
Parramatta North (Masons Drive)16.017.315.521.520.218.418.318.018.016.818.315.717.520.017.717.318.022.817.017.217.318.221.720.820.221.218.319.420.326.815.8
Penrith Lakes AWS16.116.311.421.621.418.319.317.818.717.818.417.017.417.918.616.817.523.818.017.617.018.622.121.920.820.918.020.020.528.215.4
Prospect Reservoir15.215.921.120.017.118.217.217.218.117.017.019.517.816.522.916.016.616.117.321.019.819.718.318.018.527.1
Richmond RAAF15.916.212.422.421.318.019.218.118.417.618.116.717.519.117.316.818.523.518.217.716.619.122.721.820.621.318.020.420.727.915.6
Springwood (Valley Heights)14.214.115.920.119.316.317.115.217.116.415.914.815.418.616.714.016.321.516.015.315.216.420.619.720.418.915.718.219.525.914.9
Sydney (Observatory Hill)16.417.615.821.820.818.219.118.118.017.318.414.817.420.819.818.419.322.917.517.518.019.122.121.320.621.317.519.121.226.516.5
Sydney Airport AMO14.918.017.023.521.219.519.919.118.218.316.714.118.521.518.018.819.924.217.417.615.619.422.921.421.722.217.619.421.327.016.4
Terrey Hills AWS14.315.615.920.118.016.316.816.115.715.116.213.415.917.816.916.017.421.415.215.915.117.220.919.118.519.416.517.818.123.615.7
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 2017
12345678910111213141516171819202122232425262728293031
Badgerys Creek AWS2.3-0.5-1.12.83.91.7-1.2-0.7-0.5-0.60.34.82.80.95.62.21.80.95.02.83.2-1.2-1.43.50.96.61.54.31.14.411.6
Bankstown Airport AWS3.32.30.63.35.53.31.00.20.60.33.55.05.02.36.13.42.71.75.52.12.72.1-0.93.01.95.83.46.32.63.312.4
Camden Airport AWS-0.8-1.5-1.90.92.12.8-1.6-1.9-2.1-1.9-1.63.31.00.35.3-0.10.0-0.65.75.22.8-2.3-3.12.80.51.81.33.3-0.10.18.8
Campbelltown (Mount Annan)1.00.0-0.72.33.03.0-1.2-0.7-0.5-0.60.82.22.50.66.80.01.31.07.23.52.6-0.3-1.24.41.63.85.55.01.33.010.4
Canterbury Racecourse AWS4.42.61.55.26.54.02.00.91.40.73.85.65.43.28.14.03.63.16.24.34.32.51.13.32.36.04.76.42.54.812.9
Holsworthy Aerodrome AWS2.90.5-0.72.85.23.6-1.1-0.40.3-0.14.64.54.23.17.02.71.52.85.84.44.1-0.10.24.32.05.64.36.62.24.812.3
Horsley Park Equestrian Centre AWS4.50.20.56.29.14.01.31.57.35.35.88.24.43.55.25.82.46.40.22.75.03.38.73.48.21.38.212.2
Parramatta North (Masons Drive)3.02.81.86.411.75.32.82.83.84.83.84.85.24.58.33.03.84.28.64.53.31.01.86.03.77.83.76.82.77.412.3
Penrith Lakes AWS3.61.31.74.37.24.31.82.01.81.61.86.34.03.26.23.43.53.27.72.55.30.50.94.92.87.33.25.21.66.011.3
Prospect Reservoir4.21.42.09.74.83.23.53.23.56.44.55.98.94.24.07.44.26.31.02.56.510.24.38.82.59.012.3
Richmond RAAF-1.0-0.81.04.05.22.30.20.30.4-0.1-0.70.91.81.56.41.41.81.66.70.80.1-2.1-2.15.2-0.27.00.85.0-1.15.610.4
Springwood (Valley Heights)3.54.74.19.09.16.75.35.56.16.15.16.76.67.510.85.17.37.28.56.35.03.86.58.56.311.96.48.05.86.912.2
Sydney (Observatory Hill)5.85.45.67.912.29.16.67.07.47.06.67.88.09.612.17.77.99.110.69.37.56.06.510.07.911.09.111.28.210.715.6
Sydney Airport AMO5.94.95.27.612.28.76.16.26.45.86.97.57.57.19.58.07.57.610.58.97.15.76.97.88.712.58.910.77.811.214.6
Terrey Hills AWS4.23.76.19.810.57.15.36.45.06.45.27.06.48.310.36.37.59.78.26.16.53.37.19.77.312.07.19.94.89.713.8
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 2017
12345678910111213141516171819202122232425262728293031
Abbotsbury (Fairfield (City Farm)) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Abbotsford (Blackwall Point Rd) - - - - - - - - - - - - 6.0

















Audley (Royal National Park) - - - - - - - - - - - - 6.0 - - - - - - - - - - - - - - - - - -
Avalon Beach (Avalon (Palmgrove Rd)) - - - 0.6 - - - - - - - 5.2 1.6

















Badgerys Creek AWS - - - 0.4 - - - - - - - - - - - - - - - - - - - - - - - - - - -
Bankstown Airport AWS - - - 0.4 - - - - - - - - - - - - - - - - - - - - - - - - - - -
Baulkham Hills Eucalyptus Ct - - - 0.5 - - - - - - - - - - - - - - - - - - - - - - - - - - -
Belrose (Evelyn Place) - - - - - - - - - - - 0.2 6.0 - 0.4 0.2














Box Hill (McCall Gardens) - 1.0 - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Camden Airport AWS - - 0.2 0.6 - - - - 0.2 - - 0.2 - - - - - 0.2 - - - - 0.2 - - - - - - - -
Campbelltown (Kentlyn (Georges River Roa - - - 1.0 - - - - - - - - - - - - - - - - - - - - - - - - - - -
Campbelltown (Mount Annan) - - 0.2 0.4 0.2 - - - - 0.2 0.2 - - - - - - - - - - - 0.2 - - - - - - - -
Canterbury Racecourse AWS - - - 0.2 - - - - - - - - 6.2 0.2 - - - - - - - - - - - - - - - - -
Castle Cove (Rosebridge Ave) - - - - - - - - - - - - 7.5 - - - - - - - - - - - - - - - - - -
Chatswood Bowling Club - - - - - - - - - - - - 5.0 - 1.0 - - - - - - - - - - - - - - - -
Collaroy (Long Reef Golf Club) - - - 1.0 - - - - - - - 10.6 10.2

















Concord (Brays Rd) - - - - - - - - - - - 4.2 0.2

















Concord Golf Club - - - 0.8


























Frenchs Forest (Frenchs Forest Rd) - - - - - - - - - - - - 10.0 - 1.0 - - - - - - - - - - - - - - - -
Holsworthy Aerodrome AWS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Horsley Park Equestrian Centre AWS - - - - - -



- - - - - - - - - - - - - - - - - - - - -
Lucas Heights (ANSTO) - - - - - - - - - - - - 0.4 - - - - - - - - - - - - - - - -

Marrickville Golf Club - - - - - - - - - - - - 11.0 - - - - - - - - - - - - - - - - - -
Milperra Bridge (Georges River) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Mona Vale Golf Club - - 0.2 0.6 - - - - - - - 3.8 4.6 0.2 0.2 - - - - - - - - - - - - - - - -
Mount Annan Botanic Garden - 0.1 - 0.6 - - - - - - - - - - - - - - - - - - - - - -
- - - -
North Parramatta (Burnside Homes) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
North Rocks (Muirfield Golf Club) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Parramatta North (Masons Drive) - - - 0.2 - - - - - - - - - - - - - - - - - - - - - - - - - - -
Peakhurst Golf Club - - - - - - - - - - - - 1.0 - - - - - - - - - - - - - - - - - -
Pennant Hills (Yarrara Road) 0.8 - - - - - - - - 0.4 - 0.2 - - - - - - - - - - - - - - -
Penrith Lakes AWS - 0.2 - 1.0 - - - - - - - - - - - - - 0.2 - - - - - - - - - - - - -
Prospect Reservoir - - -
0.4 - - - - - - - - - - - - - - - - - - - - - - - - - -
Randwick (Randwick St) - - - 0.2 - - - - - - - 3.4 19.0 - 0.4 - - - - - - - - - - - - - - - -
Richmond - UWS Hawkesbury - 0.2 0.4 - - - - - - - - - - - - - - - - - - - - - - - - - - -
Richmond RAAF 0.2 - - 0.4 - - - - - - - - - - - - - - - - - - - - - - - - - - -
Rose Bay (Royal Sydney Golf Club) - - - 0.2 - - - - - - - 11.6 15.3 - 0.6 - - - - - - - - - - - - - - - -
Rossmore (South Creek) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Sans Souci (Public School) - - - - - - - - - - - - 9.0 - - - - - - - - - - - - - - - - - -
Seven Hills (Radio FM 103.2) - 0.5 - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Shanes Park (South Creek Road) - 0.2 - 0.2 0.2 - - - - - - - - - - - - - - - - - - - - - - - - - -
Springwood (Valley Heights) - - - 0.6 - - - - - - - - - - - - - - - - - - - - - - - - - - -
St Ives (Richmond Avenue) - - - 0.6 - - - - - - - - 1.4 - - 0.6














Sydney (Observatory Hill) - - - 0.2 - - - - - - - 1.6 10.4 - 0.4 - - - - - - - - - - - - - - - -
Sydney Airport AMO - - - - - - - - - - - 1.2 16.0 - - - - - - - - - - - - - - - - - -
Sydney Botanic Gardens - - - 0.2 - - - - - - - 2.2 11.8 - 0.6 - - - - - - - - - - - - - - - -
Terrey Hills AWS - - - 0.4 0.2 - - - - - - - 3.8 - 0.2 - 0.2 - - - - - - - - - - - - - -
Turramurra (Kissing Point Road)


0.4







0.2
0.2














-
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 can indicate that 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 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 statement has been prepared based on information available at 10 am on Tuesday 1 August 2017. 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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