Perth in August 2016: Cool days and nights; above average rain days

Most sites in Perth recorded near average rainfall in August 2016, though an above average number of rain days was observed. Both mean maximum and mean minimum temperatures were below average.

Mostly near average rainfall

  • Monthly rainfall totals across Perth exceeded 110 mm and reached 220 mm in the hills
  • It was the wettest August for three years for most sites, including Perth Metro
  • Nineteen or twenty rain days were recorded for most sites, with four days being the longest break between rainfall events
  • Moderate to heavy rainfall occurred on the 7th-8th, 17th-18th, and 27th-28th

Cooler days and nights

Further information

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Extremes in August 2016
Hottest day 22.9 °C at Pearce RAAF on the 14th
Warmest days on average 17.9 °C at Gosnells City
Coolest days on average 14.4 °C at Bickley
Coldest day 10.7 °C at Bickley on the 8th
Coldest night -0.5 °C at Karnet on the 1st
-0.5 °C at Karnet on the 24th
Coolest nights on average 5.2 °C at Karnet
Warmest nights on average 11.4 °C at Rottnest Island
9.4 °C at Swanbourne
Warmest night 14.5 °C at Rottnest Island on the 17th
14.0 °C at Swanbourne on the 17th
Warmest on average overall 14.2 °C at Rottnest Island
13.4 °C at Swanbourne
Coolest on average overall 10.1 °C at Karnet
Wettest overall 228.0 mm at Jarrahdale
Driest overall 116.0 mm at Garden Island HSF
Wettest day 58.0 mm at Jarrahdale on the 27th
Strongest wind gust 94 km/h at Rottnest Island on the 17th
94 km/h at Swanbourne on the 17th

Highest August total rainfall for at least 20 years
Observed
(mm)
Most recent
higher
Average for
August
Rottnest Island 125.4 126.2 in 1986* 86.1

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




Record lowest August mean daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Bickley 14.4 14.7 in 2004 22 16.1
Swanbourne 17.4 = 17.4 in 2004 22 19.0

Lowest August mean daily maximum temperature for at least 20 years
Observed
(°C)
Most recent
lower
Average for
August
Perth Airport 17.5 17.4 in 1992 18.6



Record lowest August temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Gosnells City 2.2 on the 1st = 2.2 on the 21st in 2000 24 9.0



Record lowest August mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Rottnest Island 11.4 = 11.4 in 1992 26 12.5



Record lowest August mean temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Bickley 10.4 10.6 in 2004 22 11.9

Lowest August mean temperature for at least 20 years
Observed
(°C)
Most recent
lower
Average for
August
Perth Airport 12.5 11.8 in 1986 13.3
Rottnest Island 14.2 14.1 in 1992 15.2

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




Summary statistics for August 2016
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
August
2016
Diff
from
average
Highest for
August
2016
Mean for
August
2016
Diff
from
average
Lowest for
August
2016
Total for
August
2016
Average
for
August
Rank of
August
2016
Fraction of
August
average
Bickley 14.4 -1.7 19.8 14th 6.4 -1.3 1.7 24th 220.0 172.5 high 128%
Garden Island HSF 16.8 -1.5 19.7 26th 10.3 -1.0 7.1 24th 116.0 92.4 high 126%
Gosnells City 17.9 -1.6 21.9 14th     2.2 1st 144.9 126.1 average 115%
Jandakot Aero 17.4 -1.3 20.9 26th 7.0 -0.1 0.2 1st 141.0 126.5 average 111%
Karnet 15.1 -0.9 20.0 13th 5.2 -1.1 -0.5 1st 205.1 186.0 average 110%
Medina Research Centre 17.7 -1.2 21.4 14th 7.3 -0.9 0.9 1st 143.0 113.9 high 126%
Pearce RAAF 17.5 -0.9 22.9 14th 7.5 -0.7 1.8 1st 134.2 104.5 high 128%
Perth Airport 17.5 -1.1 22.3 14th 7.5 -0.6 1.1 1st 120.2 117.6 average 102%
Perth Metro 17.7 -1.4 21.9 14th 7.9 -0.4 1.6 1st 123.2 133.0 average 93%
Rottnest Island 17.0 -1.0 19.1 26th 11.4 -1.1 8.9 24th 125.4 86.1 v high 146%
Swanbourne 17.4 -1.6 21.2 26th 9.4 -0.7 4.0 1st 139.0 116.2 high 120%
Note: Observations for “Perth Metro” are taken from the current site at Mount Lawley (Bureau number 009225).
Comparisons are made against combined data from the current site (which opened in early 1993) and the previous site at Perth Regional Office (009034), which ran from 1876 to early 1992.

Daily maximum temperatures for August 2016
12345678910111213141516171819202122232425262728293031
Bickley12.814.514.812.113.315.914.210.712.214.816.014.917.119.816.116.412.811.712.915.515.013.113.613.715.918.613.012.714.814.414.4
Garden Island HSF15.817.117.015.215.917.616.814.615.917.318.716.017.318.018.418.917.814.616.116.817.414.516.216.919.019.716.714.915.217.615.6
Gosnells City16.817.817.916.117.018.318.815.216.518.819.317.919.621.919.820.515.116.417.818.916.717.517.219.421.015.515.717.418.217.7
Jandakot Aero16.317.417.815.516.517.817.214.616.417.818.917.119.420.819.619.415.915.415.918.117.915.916.616.519.020.917.216.016.917.517.0
Karnet13.715.515.012.814.616.414.012.014.515.116.220.018.715.617.013.811.815.615.515.513.113.514.916.518.914.013.014.515.5
Medina Research Centre17.118.417.715.318.014.316.218.819.617.520.021.418.820.017.014.616.017.018.115.817.017.419.221.017.016.317.017.9
Pearce RAAF15.517.517.915.816.218.917.514.816.717.318.517.218.722.920.019.316.615.416.218.018.316.116.116.218.820.417.216.517.317.617.1
Perth Airport15.717.317.215.516.518.217.414.416.717.719.317.719.122.318.920.015.615.317.017.818.016.516.716.718.820.716.816.117.717.917.7
Perth Metro15.817.317.815.916.717.717.715.117.018.419.317.919.721.919.619.916.215.415.917.918.516.316.817.118.721.517.016.517.618.217.2
Rottnest Island15.317.318.215.515.517.617.115.217.118.018.916.318.517.718.718.717.515.817.217.918.014.714.915.318.419.116.715.815.818.116.0
Swanbourne16.217.918.315.616.518.017.914.917.417.819.917.218.419.619.519.417.114.816.017.618.915.416.916.818.921.217.015.716.717.416.0
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 August 2016
12345678910111213141516171819202122232425262728293031
Bickley2.32.65.99.57.98.77.17.45.96.88.95.06.05.39.86.910.24.75.57.66.14.74.31.73.77.68.57.48.34.78.3
Garden Island HSF7.67.69.813.111.18.411.811.211.010.511.77.78.87.810.410.613.39.510.311.911.610.38.37.19.312.112.412.012.48.912.3
Gosnells City2.25.57.912.67.810.68.69.56.88.411.55.96.64.57.48.26.63.03.46.06.59.012.58.5
Jandakot Aero0.22.63.112.15.68.210.49.89.67.711.13.75.33.26.84.512.64.28.59.26.13.52.54.66.112.110.910.89.03.211.2
Karnet-0.51.94.58.47.36.57.57.04.58.51.86.02.96.84.18.52.43.07.03.05.30.8-0.54.79.19.08.48.51.98.5
Medina Research Centre0.92.24.511.77.17.710.18.812.04.67.43.57.96.012.26.78.87.06.22.93.85.411.711.011.08.43.711.4
Pearce RAAF1.82.66.512.26.110.610.59.68.07.59.85.75.35.07.67.712.06.08.97.87.94.82.23.48.011.411.010.39.34.29.7
Perth Airport1.14.87.112.17.89.69.510.16.08.811.14.96.36.27.57.111.14.28.18.86.64.51.85.74.911.610.910.210.53.510.1
Perth Metro1.62.34.611.87.19.210.310.310.58.611.54.96.44.68.97.412.15.59.59.17.37.53.33.86.212.011.210.911.14.510.9
Rottnest Island9.29.711.713.911.912.110.410.110.310.912.911.212.611.913.612.714.510.111.111.912.19.39.28.910.012.012.210.412.511.212.9
Swanbourne4.04.78.112.58.910.411.310.510.59.112.27.68.57.512.99.114.08.09.611.49.48.55.94.77.411.911.911.210.76.911.4
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 August 2016
12345678910111213141516171819202122232425262728293031
Anketell 2.0 - - 5.2 6.4 - 13.4 8.6 8.0 8.4 0.6 4.6 - - - 6.6 3.8 18.0 1.2 8.8 0.8 10.6 - - - - 36.2 7.0 - - 17.0
Bickley 2.2 0.2 - 5.2 7.0 0.2 11.6 34.6 17.0 9.4 0.4 6.2 - - - 6.2 2.6 32.0 0.2 10.6 0.8 5.4 - - - - 50.8 10.2 0.4 - 6.8
Bungendore 1.8 - - 6.4 4.6 - 8.6 20.6 9.0 7.6 1.8 10.0 - 0.2 - 4.4 1.6 26.6 - 9.8 0.2 14.8 0.2 - - - 51.0 10.4 2.2 0.2 5.0
Chidlow 14.8 - - 2.4 0.6 0.4 35.8 9.2 2.0 - 3.6 - - - 4.0 1.2 30.8 - 3.4 5.2 - - - - 29.2



Garden Island HSF 1.2 - - 5.0 2.2 - 12.4 7.2 5.2 7.0 0.4 5.4 - - - 1.2 4.2 8.8 - 8.4 - 5.4 - - - - 20.4 5.8 - - 15.8
Gidgegannup 3.8 - - 2.6 0.4 - 18.2 18.2 11.2 4.4 - 3.2 0.2 - - 10.8 0.2 26.8 - 3.2 1.0 4.6 - - - - 33.6 6.2 0.2 0.2 3.4
Gosnells City 1.7 - - 4.2 1.0 - 13.2 15.0 5.0 4.8 0.8 7.8 - - - 4.5 18.6 0.3 9.1 3.6 7.5 - - - 35.0 6.8 2.0 - 4.0
Jandakot Aero 1.4 - - 4.4 4.0 - 7.6 16.0 5.0 5.4 1.4 3.0 - - - 3.8 2.0 17.4 0.2 10.2 3.8 6.8 - - - - 33.6 8.0 - - 7.0
Jarrahdale 3.4 1.2 - 8.0 4.6 0.4 17.6 20.6 10.6 9.8 0.8 7.6 0.2 - 0.2 11.8 2.4 28.4 0.2 9.0 0.4 9.4 0.2 0.2 0.2 - 58.0 9.0 0.8 0.2 12.8
Karnet 2.2 - - 6.4 4.0 1.0 22.2 20.6 11.8 1.4 7.8 - - - 5.8 6.0 30.2 0.2 - 6.2 - - - - 53.0 11.6 2.7 - 12.0
Karragullen North 3.8 - - 6.0 3.8 - 14.0 29.3 10.2 7.4 1.4 9.0 - - - 5.4 2.8 28.4 0.1 9.2 1.2 7.1 - - - - 42.8 10.2 0.8 - 4.4
Maida Vale 1.2 - - 5.2 3.2 - 8.0 13.2 9.4 5.0 1.0 7.2 - - - 4.0 2.0 20.8 0.4 8.2 1.8 4.0 0.2 - - - 41.2 6.0 1.0 - 6.0
Medina Research Centre 0.8 - - 6.4 2.4 19.4 6.8 5.8 0.6 4.4 - - 0.6 4.4 6.6 14.6 0.2 10.2 0.4 7.6 0.1 - - - 27.0 5.6 0.1 - 19.0
Midland 8.2 - - 3.4 - 32.2 6.8 3.6 - 4.8 - - - 9.2 3.2 24.2 - 8.2 - - - - 47.1 - 6.4
Mount Helena 3.4

2.8 0.6 0.6 15.4 20.0 12.0 2.8 3.0



7.0 1.4 33.0
7.8 1.0 3.6



34.0 7.8

6.2
Mundaring 3.6 - - 4.4 1.6 - 17.4 14.4 12.8 4.4 - 4.2 - - - 9.6 3.2 29.0 - 9.2 1.6 - - - - - 40.6 10.0 - - 5.8
Pearce RAAF 4.6 - 0.2 2.0 - - 13.2 11.8 5.4 7.4 - 9.6 - - - 14.6 0.2 20.0 - 2.2 1.4 3.4 0.2 - - - 25.2 7.0 - - 5.8
Perth Airport 0.8 - - 3.2 3.4 - 7.4 6.8 7.0 2.6 0.4 4.4 - - - 5.8 1.8 20.0 0.2 9.0 0.4 2.6 - - - - 30.8 5.2 - - 8.4
Perth Metro 0.8 - - 3.0 3.0 - 5.0 12.2 5.2 4.8 0.4 5.4 - - 0.2 4.0 1.6 17.4 - 2.8 1.6 7.4 - - - - 31.0 7.6 - - 9.8
Pickering Brook 3.6

4.4 6.8
13.4 10.2
5.8 1.0 5.6


5.2 3.4 30.0
9.4 1.2 10.2



47.8 9.6

5.0
Roleystone 4.2 - - 6.5 3.6 - 12.6 19.1 8.4 5.9 1.2 5.8 - - - 3.8 2.2 30.8 - 10.6 1.4 8.1 - - - - 44.6 12.1 0.9 - 4.6
Rottnest Island 0.8 - - 4.6 2.8 - 12.4 5.4 2.0 4.6 1.8 6.8 - - - 4.0 11.0 11.0 - 2.4 - 5.0 - - - - 21.2 7.6 - - 22.0
Serpentine 2.2 - - 6.0 3.0 - 14.6 11.2 4.6 10.4 0.2 8.4 - - - 6.2 3.8 21.0 0.2 9.6 - 10.4 - - - - 39.8 4.4 1.2 - 15.0
Swanbourne 1.2 - - 4.8 3.6 - 5.0 8.6 5.4 5.8 2.8 10.8 - - - 4.6 11.2 12.8 - 1.4 3.4 7.6 - - - - 33.6 4.2 - - 12.2
Wanneroo 8.2 - - 2.6 2.4 22.6 2.6 6.6 0.6 8.6 0.2 10.0 1.2 17.4 0.1 16.8 - - - - 39.0 - 9.0
Werribee 1.2 0.2 - 4.2 1.4 0.2 19.0 15.4 6.6 2.6 - 2.8 - - 0.2 13.2 0.2 21.6 0.2 2.4 0.4 3.4 - 0.2 - - 28.2 5.6 - 0.2 1.6
Whiteman Park 1.4 - - 3.6 4.2 0.2 12.6 14.8 6.8 2.5 - - 6.8 - - 6.2 1.0 26.2 - 5.6 4.6 8.0 - - - - 41.0 6.6


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 lists the main features of the weather in Perth 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 10 am on Thursday 1 September 2016. 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.

Observations for “Perth Metro” are taken from the current site at Mount Lawley (Bureau number 009225).
Comparisons are made against combined data from the current site (which opened in early 1993) and the previous site at Perth Regional Office (009034), which ran from 1876 to early 1992.

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