Monday, 2 September 2019 - Monthly Climate Summary for Greater Perth - Product code IDCKGC11L0

Greater Perth in August 2019: a wet finish; mild days

Mean maximum temperatures were above average across the Greater Perth. Mean minimum temperatures were generally below average. A wet and wintry finish to August had lifted monthly rainfall totals to average.

Near average rainfall across Perth

  • Monthly rainfall totals were mostly in the 90-120 mm range, up to 170-200 mm in the Perth hills
  • Perth Metro recorded a monthly rainfall total of 114.2 mm, which was near average though the driest August since 2015
  • Perth Metro recorded 510.4 mm for year to date (January-August) and around 89% of the average

Above average daytime temperatures and below average night-time temperatures

  • Mean maximum temperatures were above average; mean minimum temperatures were mostly below average
  • Perth Metro's mean maximum temperature was 20.2 °C, which was 1.2 °C  above average, and warmest August since 2014 (21.6 °C)
  • Perth Metro's mean minimum temperature was 7.7 °C, which was 0.6 °C below average and coolest August since 2010 (6.3 °C)
  • It was a spring-like day on the 28th with temperatures in the high 20s to low 30s across the coastal pain sites, and several sites had their highest August temperature on record
  • Perth Metro's temperature climbed to 30.0 °C at 2:17pm (WST) on the 28th, which not only exceeded the site's previous August record of 27.2 °C set on 26 August, but also exceeded the city's previous August record of 27.8 °C on 21 August 1940 at the old Perth Observatory

Perth Metro

  • Total rainfall for Perth Metro was 114.2 mm, which is 91% of the long-term average of 125.5 mm
  • The warmest day was 30.0 °C on the 28th, and the coolest day was on the 8th when the temperature reached 15.8 °C
  • The coldest morning was 3.1 °C on the 18th, and the warmest morning was on the 30th when the minimum temperature was 13.8 °C

Thunderstorms and severe wind gusts

  • A strong cold front produced thunderstorms over Perth, with small hail were reported in Perth's northwestern suburbs on the 5th
  • A strong cold front followed by a cold southwest airmass produced damage winds in Perth on the 16th and 17th. Ocean Reef recorded a westerly wind gust of 107 km/h in the evening on the 16th; Rottnest Island recorded a southwesterly wind gust of 100 km/h early morning on the 17th

Further information

Media
(03) 9669 4057
Enquiries

Extremes Maps Records Summaries Daily observations Important notes the top

Extremes in August 2019
Hottest day 30.2 °C at Swanbourne on the 28th
Warmest days on average 20.2 °C at Perth Airport and at Perth Metro
Coolest days on average 16.9 °C at Bickley
Coldest day 12.3 °C at Bickley on the 17th
Coldest night 1.3 °C at Jandakot Aero on the 24th
Coolest nights on average 7.1 °C at Jandakot Aero
Warmest nights on average 12.5 °C at Rottnest Island
Warmest night 16.5 °C at Rottnest Island on the 3rd
Warmest on average overall 15.6 °C at Rottnest Island
Coolest on average overall 12.1 °C at Bickley
Wettest overall 212.2 mm at Bickley
Driest overall 48.2 mm at Midland
Wettest day 50.8 mm at Karragullen North on the 30th
Strongest wind gust 107 km/h at Ocean Reef on the 16th

Extremes Maps Records Summaries Daily observations Important notes the top


Record highest August temperature

New record
(°C)		 Old
record		 Years of
record		 Average for
August
Perth Airport 29.9 on the 28th 28.3 on the 26th in 1998 76 18.6
Karnet 27.0 on the 28th 25.0 on the 15th in 2015 54 15.9
Jandakot Aero 29.4 on the 28th 27.0 on the 15th in 2015 30 18.7
Bickley 26.6 on the 28th 24.7 on the 25th in 1994 26 16.0
Perth Metro 30.0 on the 28th 27.2 on the 26th in 1998 26 19.0
Swanbourne 30.2 on the 28th 28.0 on the 15th in 2015 26 18.9


Extremes Maps Records Summaries Daily observations Important notes the top

Summary statistics for August 2019

Maximum temperatures
(°C)		 Minimum temperatures
(°C)		 Rainfall
(millimetres)
Mean for
August
2019		 Diff
from
average		 Highest for
August
2019		 Mean for
August
2019		 Diff
from
average		 Lowest for
August
2019		 Total for
August
2019		 Average
for
August		 Rank of
August
2019		 Fraction of
August
average
Bickley 16.9 +0.9 26.6 28th 7.4 -0.2 3.8 24th 212.2 176.8 high 120%
Garden Island HSF 19.0 +0.9 25.9 28th 11.2 0.0 7.4 19th 94.0 95.8 average 98%
Jandakot Aero 19.9 +1.2 29.4 28th 7.1 -0.1 1.3 24th 132.4 129.1 average 103%
Mandurah 18.7 +0.7 23.9 28th 10.8 -0.2 7.2 7th 98.2 97.7 average 101%
Millendon (Swan Valley) 20.0   28.5 28th 7.4   2.2 18th 119.8


Pearce RAAF 20.0 +1.6 29.0 28th 8.4 +0.2 2.8 18th 102.4 106.1 average 97%
Perth Airport 20.2 +1.6 29.9 28th 7.8 -0.3 1.9 18th 115.8 118.9 average 97%
Perth Metro 20.2 +1.2 30.0 28th 7.8 -0.5 3.1 18th 114.2 125.5 average 91%
Rottnest Island 18.7 +0.8 24.1 12th 12.5 +0.1 9.3 24th 86.4 87.9 average 98%
Swanbourne 20.0 +1.1 30.2 28th 10.3 +0.2 5.9 24th 121.6 119.2 average 102%

Extremes Maps Records Summaries Daily observations Important notes the top

Daily maximum temperatures for August 2019

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Bickley 17.4 21.1 19.8 15.1 14.7 13.8 13.2 13.0 15.1 15.2 18.9 21.2 16.6 14.5 14.6 14.0 12.3 15.2 16.5 20.1 20.7 22.6 12.3 13.6 17.4 17.6 20.6 26.6 17.6 14.9 16.6
Garden Island HSF 20.7 23.6 21.4 19.3 19.1 15.1 15.1 16.3 15.2 18.4 21.9 23.7 19.5 16.6 16.7 18.5 14.8 16.2 18.1 20.1 22.9 22.7 14.9 15.6 17.2 19.6 22.5 25.9 21.1 18.3 18.2
Gosnells City
25.3 22.5 19.2
16.5
17.1 18.2 19.4 22.6 25.0
18.0
18.4 15.2
20.2 24.0 24.0 26.0 15.5 17.1 21.1 21.5

21.5 19.1 20.0
Jandakot Aero 20.5 24.8 22.0 19.4 17.7 15.9 15.6 15.4 17.0 17.8 22.2 24.7 19.8 17.2 17.5 18.0 15.7 17.9 19.5 22.9 23.5 25.4 15.7 16.8 20.6 20.6 23.7 29.4 21.2 19.1 18.8
Karnet 18.8 22.1 18.4 16.2 16.0 13.3 13.6
15.1 15.3 19.4
17.5 15.3 14.6 14.6 12.8 15.5 17.8 20.5 21.4


17.5 18.4
27.0


Mandurah 20.6 23.0 19.6 18.8 18.3 15.4 15.6 15.5 15.7 19.4 21.9 21.4 19.2 17.1 17.2 17.9 14.9 17.1 17.7 18.6 20.4 20.5 14.9 16.5 18.8 20.4 22.7 23.9 19.9 17.9 18.4
Millendon (Swan Valley) 20.1 24.5 23.7 19.0 17.4 17.3 16.5 16.3 18.8 18.4 22.0 23.9 20.1 17.4 17.9 17.7 15.8 18.5 19.4 22.6 22.3 25.3 16.3 16.5 19.6 19.9 23.3 28.5 21.6 18.9 19.2
Pearce RAAF 20.5 24.9 23.5 19.7 17.7 17.3 16.2 16.3 17.7 18.3 22.7 24.3 20.1 17.8 17.4 18.1 16.3 17.9 19.1 22.6 22.9 25.6 16.3 16.1 19.5 19.7 23.9 29.0 22.2 18.8 19.1
Perth Airport 20.9 25.0 22.8 18.8 18.4 17.4 16.4 16.1 17.6 19.0 22.4 24.9 20.3 17.8 17.9 17.7 15.9 18.6 19.7 23.2 23.7 26.7 16.0 16.4 19.9 20.6 23.5 29.9 21.9 18.6 19.1
Perth Metro 20.8 24.9 22.3 19.6 18.0 16.4 16.5 15.8 18.0 19.0 22.5 24.7 20.3 17.3 17.6 17.9 16.1 18.6 19.5 22.8 23.5 26.4 15.8 16.9 20.2 20.7 23.3 30.0 21.5 19.6 19.2
Rottnest Island 20.0 24.0 21.8 19.2 19.1 15.4 15.8 16.6 14.8 17.3 21.1 24.1 19.6 17.2 17.4 18.9 15.6 16.5 19.0 20.3 22.4 21.7 15.3 15.4 17.5 18.7

20.8 18.7 18.8
Swanbourne 21.2 25.4 20.9 19.4 18.1 15.3 15.7 16.4 16.9 18.9 22.9 25.5 19.9 17.5 17.0 18.1 16.0 17.4 20.3 22.3 24.5 24.3 15.8 16.9 20.4 20.7 23.3 30.2 21.1 18.7 19.0
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 2019

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Bickley 5.2 6.5 11.2 10.6 10.4 6.4 4.2 5.7 6.1 6.0 6.3 7.1 11.3 9.7 4.8 7.3 5.3 5.2 5.4 5.8 7.2 9.4 7.6 3.8 5.5 5.5 5.6 9.5 14.3 10.1 9.8
Garden Island HSF 10.7 11.9 13.8 15.2 15.2 10.0 9.3 10.1 9.9 9.0 11.3 12.6 15.3 12.2 9.6 12.3 9.5 7.9 7.4 8.4 10.4 10.5 12.2 8.7 9.8 9.9 9.5 13.1 12.3 14.6 13.7
Gosnells City 9.5

14.9 13.0
5.5
6.2 6.8 10.1 13.1 12.0
5.2
7.0 4.5
4.5 13.8 7.5 10.0 6.0 7.7 10.5 8.5

12.5 12.2
Jandakot Aero 6.2 6.1 9.5 12.9 12.4 7.0 2.6 4.6 4.2 3.7 10.7 10.5 9.7 9.9 3.2 6.5 6.2 1.9 3.3 3.5 6.3 6.6 11.1 1.3 5.2 5.6 5.3 8.3 10.6 13.1 12.4
Karnet 6.5 7.5 11.2 10.5 9.2 7.7 2.3 3.0
5.0 6.8 11.5
6.8 2.5
8.4 2.3
3.2 8.3 6.9



5.2
10.4

Mandurah 9.1 11.7 13.5 14.7 14.9 11.3 7.2 9.3 9.3 7.5 10.9 13.4 14.3 11.6 7.6 10.7 8.5 7.7 7.2 8.0 10.8 13.3 12.3 7.3 9.0 9.1 9.3 12.3 15.6 12.8 13.1
Millendon (Swan Valley) 5.3 8.0 11.4 12.8 10.3 6.9 5.0 3.3 3.3 4.7 9.8 11.8 8.8 10.8 3.5 4.7 5.3 2.2 2.6 4.6 8.3 8.5 7.9 2.8 5.4 8.2 6.1 12.3 10.9 13.2 11.8
Pearce RAAF 5.6 9.2 13.1 13.5 11.6 7.7 6.0 3.9 4.4 5.8 11.3 13.4 10.0 12.3 4.2 5.3 6.4 2.8 3.3 5.1 9.3 9.4 9.2 4.9 6.2 8.1 7.0 15.7 11.3 13.3 11.4
Perth Airport 8.5 9.0 12.0 12.8 11.6 7.4 3.9 3.6 3.5 4.5 10.1 11.3 10.6 11.0 3.2 6.7 5.7 1.9 2.5 4.3 9.8 4.2 9.0 3.4 5.2 7.2 5.9 14.5 12.1 13.8 12.2
Perth Metro 5.7 6.1 12.1 12.8 12.1 8.2 5.5 6.4 5.5 4.7 10.2 10.2 11.4 10.9 5.0 7.7 6.7 3.1 3.3 4.6 6.2 7.7 10.3 3.6 5.5 5.0 6.0 9.1 11.1 13.8 12.3
Rottnest Island 12.7 13.7 16.5 14.4 14.5 12.0 11.3 10.6 10.9 11.2 11.3 14.7 16.1 13.4 11.5 13.0 9.8 11.4 11.7 11.7 14.4 14.7 11.6 9.3 10.7 11.7 12.2

13.1 11.1
Swanbourne 8.1 10.8 15.8 14.7 13.5 9.3 7.5 9.0 7.7 7.3 10.9 11.8 13.5 12.4 7.8 10.6 9.0 6.9 6.4 7.6 10.2 11.6 11.7 5.9 7.2 8.1 9.2 14.4 15.3 12.9 12.8
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 August 2019

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Anketell - - - 1.8 3.8 14.4 1.4 - 1.4 - - - 5.0 6.6 3.0 - 21.2 0.2 - - - - 19.2 0.4 - - - - - 40.8 10.2
Araluen - - 3.8 2.4 27.0 - - - 2.4 - - 10.2 8.4 4.0 - 31.0 - - - - - 35.6 4.0 - - - - 0.2 36.7 17.6 0.8
Bickley - - - 5.6 1.6 26.2
0.2 0.4 0.4 - - 13.2 9.4 2.0 - 47.4 - 0.2 - 0.2 - 43.6 1.6 - - - - - 43.6 16.6
Bungendore - - - 2.8 3.6 27.2 1.2 - 1.8 0.2 - - 7.4 10.6 4.0 - 24.0 0.2 0.2 - 0.2 - 37.6 1.0 0.2 - - - 0.2 39.2 20.8
Chidlow - - - ? 4.6 4.2 1.2 - - - - - 6.2 15.6 2.6 - 22.0 - - - - - 16.2 2.6 - - - - - 36.2 17.8
Garden Island HSF - - - 9.8 - 11.6 1.2 - 1.4 - - - 4.0 13.0 2.2 - 13.4 0.6 - - - - 15.2 0.4 - - - - - 15.0 6.2
Gidgegannup - - - 4.0 0.4 4.0 0.6 0.2 0.2 0.2 - - 4.8 20.8 8.0 0.2 24.4 0.2 0.2 - - - 24.6 0.8 0.2 - - - - 35.0 16.2
Gosnells City - - - 1.2 - - - - - - - - 8.7 ? 1.4 ? 26.0 0.4 - - - - 23.0 8.0 - ? ? ? ? ? 10.8
Huntly - - - 2.0 3.0 36.2 1.4 0.2 2.0 - - - 6.0 3.0 4.6 - 40.0 - - - - - 25.0 2.2 - - 0.2 - - 28.2 13.6
Jandakot Aero - - - 0.4
25.2 1.2 - 0.6
- - 8.2 8.6 2.2 - 25.6 0.2 - - - - 27.4 0.6 - - - - - 21.2 11.0
Jarrahdale 0.2 - - 10.4 0.8 28.6 1.0 0.2 0.6 0.2 - - 7.0 11.6 3.2 0.2 28.2 0.2 0.2 0.2 0.2 - 26.0 1.0 0.2 0.2 0.4 - - 50.6 10.6
Karnet - - - 10.4 1.2 10.8 0.9 - ? 0.4 - - ? 2.0 2.9 - 36.8
0.2 - - - - - - - - - -

Karragullen North - - - 3.6 - 31.4 1.2 - 1.6 - - - 9.2 9.4 3.6 - 35.6 - - - - - 26.8 1.8 - - - - - 50.8 16.4
Maida Vale - - - 3.0 2.8 32.6 1.6 - - - - - 6.0 8.6 1.6 - 30.6 0.4 - - - - 18.4 2.8 - - - - - 31.6 11.8
Mandurah - - - - 2.8 25.0 2.8 - 2.6 - - - 3.4 12.4 1.4 0.6 15.8 0.4 - - - - 12.8 0.8 - - - - - 10.8 6.6
Midland - - ? ? 8.4 - - - - ? ? 6.0 - 16.0 - - - - - - - - 17.0 ? ? 0.8 -



Millendon (Swan Valley) - - - 3.4 1.8 5.4 1.0 0.2 0.4 0.2 - - 3.8 16.0 4.4 - 22.6 - 0.2 - - - 20.6 0.4 0.2 - - - - 24.8 14.4
Mount Solus - - - 9.8 1.2 19.2 0.6 - 0.8 0.2 0.2 - 6.4 3.4 2.4 - 35.0 - - - - - 19.2 2.4 - - - - - 48.8 19.8
Muchea - - - 5.8 1.0 4.8 1.0 0.2 1.4 - 0.2 - 3.0 5.2 4.0 - 16.6 - - 0.2 - - 17.0 0.4 0.2 - - - 0.6 20.6 11.2
Mundaring - - - 3.8 1.0 7.0 - 0.2 0.2 - - - 8.0 12.6 5.6 0.2 24.8 - - - - - 27.4 4.6 - - - - - 30.6 15.8
Pearce RAAF - - - 7.8 0.4 11.2 1.4 0.2 2.0 0.2 - - 1.8 5.4 2.6 - 18.0 - 0.2 - - - 14.6 - 0.2 - - - - 25.6 10.8
Perth Airport - - - 2.0 0.6 11.2 0.6 - - 0.2 - - 4.6 10.2 3.0 - 23.2 - 0.2 - - - 20.8 1.8 - - - - - 25.0 12.4
Perth Metro - - - 1.6 0.2 14.4 1.0 - 2.6 0.2 - - 4.2 4.8 2.4 - 26.6 - - - - - 18.8 0.2 - - - - - 28.0 9.2
Pinjarra Refinery - - - 1.4 7.0 10.0 2.0 0.2 2.2 - - 0.2 3.2 4.4 2.6 0.8 29.0 - 0.3 - - - 19.8 0.6 - - - - 2.2 23.8 8.4
Pinjarra South - - - 0.8 1.4 17.6 0.8 - 0.2 - - - 2.8 8.8 2.2 0.4 25.0 - - - - - 18.4 0.2 - - - - - 20.2 8.4
Roleystone - - - 4.0 2.2 31.0 1.2 - 0.7 - - - 10.0 13.2 - - 30.0 - - - - - 35.8 - - - - - - 36.8 17.4
Rottnest Island - - - 1.2 0.2 7.0 1.0 0.2 7.4 - - - 1.6 10.4 4.4 - 18.4 0.4 - - - - 12.0 0.6 - - -

14.4 7.2
Serpentine - - - 19.4 - 22.8 1.4 - 1.0 - - - 5.4 8.2 2.6 - 20.4 - - - - - 14.6 0.6 - - - - - 27.6 11.2
Subiaco Treatment Plant - - - 2.0 0.2 24.6 1.8 - 2.0 0.2 - - 9.0 6.2 1.4 - 11.2













Swanbourne - - - 6.2 - 32.4 1.6 - 1.0 0.2 - - 9.6 9.8 1.4 - 14.2 0.2 - - - - 16.0 0.4 - - - - - 20.0 8.6
Tamala Park (Mindarie) - - - 6.0 0.2 3.6 4.0 - - - - - 12.2 22.8 1.8 - 14.0 1.0 - - - - 16.8 3.0 - - - - - 26.0
Wanneroo - - ? ? 6.0 ? 5.3 - 0.8 - - - 9.6 35.0 4.4 - ? ? 15.2 - - - 17.4 ? ? 2.6 - - - 24.6
Werribee - - - 9.8 0.4 5.8 0.8 - 0.2 0.4 - - 2.8 13.0 6.8 - 18.2 - - 0.2 - - 13.4 1.6 0.2 - - - - 28.0 13.4
Whiteman Park - - - 4.2 0.8 10.0 - - 4.2 - - - 6.2 20.4 9.6 - 17.8 0.2 - - 0.2 - 24.8 0.4 - - - - - 27.0
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

Extremes Maps Records Summaries Daily observations Important notes the top

Notes

The Monthly climate summary, generally published on the first working day of each month, lists the main features of the weather in Greater Perth 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 Perth “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 7 pm on Sunday 1 September 2019. 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
Enquiries

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