Western Australia in July 2020: very warm and dry

July 2020 was a very warm and dry month for Western Australia, and it mirrored the conditions experienced 12 months ago in July 2019 for most of the state. Mean maximum temperatures were very much above average for most of WA, including an area of warmest on record in the state's northwest. The statewide mean maximum temperature was the second-highest in July on record, and not far behind the record warmth of July 2019. July rainfall was below average for most of WA. The first 7–months of the year were the fifth-warmest January–July period on record for Western Australia as a whole.

Below average rainfall for most of WA

  • For Western Australia as a whole, rainfall in July 2020 was 56% below average.
  • Year-to-date rainfall was just 7% below for the January–July period average for Western Australia.
  • For the South West Land Division (SWLD), July rainfall was the eleventh-lowest on record, after rainfall in July 2019 at the tenth-lowest, with comparable rainfall records commenced in 1900.
  • For the SWLD, it has been the sixth-driest year-to-date, after fifth-driest January–July period in 2019; it was also the fourth-driest southern wet season so far (April–July).
  • A cold front and a pre-frontal trough brought widespread moderate rainfall in the west and southwest of the state on the 17th; daily rainfall totals ranged from 25–50 mm in the southwest Gascoyne, the northern and western parts of the SWLD and an area around Esperance, to 10–15 mm in the eastern parts of the SWLD.
  • Useless Loop in the Gascoyne coast recorded 49.4 mm on the 17th, which was its wettest July day on record
  • An area in the central Pilbara saw above average July rainfall, largely due to moderate to heavy daily rainfall between 20–60 mm on the 19th from the passage of a low pressure trough; the highest daily rainfall of the month was 63.0 mm at Warambie (southeast of Karratha).

Very warm days for most of WA

  • Mean maximum temperatures were well above average for most of WA, including an area of warmest on record in the northwest.
  • The mean maximum temperature in July 2020 was 2.52 °C above average, which was the second-highest on record, just slightly below the record warm July 2019 for Western Australia as a whole.
  • Many sites along the northwest and west coasts, including Cape Leeuwin and Cape Naturaliste with over 100 years of record, had their warmest July on record in terms of maximum temperatures.
  • Very warm days with temperatures in the high-20s to low-30s were observed in the west Pilbara and west Gascoyne at the start of July between the 3rd and 5th, and a number of sites had their highest July temperature on record.
  • Carnarvon Airport recorded 3 consecutive days of 30 °C or above between the 3rd and 5th, and 32.5 °C on the 3rd was its new July record.; prior to 2020, the highest count of such days in July was 2 in 1977.
  • Very warm days with temperatures in the mid-20s were observed in parts of the SWLD on the 27th and 30th, and some sites had their highest July temperature on record.
  • The mean minimum temperature in July 2020 was 0.55 °C above average for WA as a whole.
  • The statewide mean temperature for the year-to-date (January–July) was the fifth-highest on record.
  • The statewide mean maximum and minimum temperature for the year-to-date was the third-highest and ninth-highest on record respectively.

Strong winds

  • On the 27th, the passage of a moderate cold front produced strong winds and some damage in the South West Land Division (SWLD). Strong northwest winds ahead of the front caused blowing dust through eastern parts of the SWLD. Both Gnowangerup and Manjimup recorded a 83 km/h (45 knot) wind gust, and Cape Leeuwin recorded a gust of 96 km/h (52 knot). Damage was reported from Busselton where a group of 6 units lost its tin roof.

Further information

Media
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Extremes in July 2020
Hottest day 35.8 °C at Kalumburu on the 2nd
Warmest days on average 33.3 °C at Kalumburu
Coolest days on average 15.2 °C at Katanning
Coldest day 10.7 °C at Rocky Gully on the 17th
Coldest night -3.5 °C at York on the 12th
Coolest nights on average 3.0 °C at York
Warmest nights on average 22.6 °C at Troughton Island
Warmest night 24.6 °C at Troughton Island on the 13th
Warmest on average overall 25.9 °C at Troughton Island
Coolest on average overall 10.5 °C at Newdegate Research Station
Wettest overall 248.8 mm at Witchcliffe
Wettest day 63.0 mm at Warambie on the 19th
Strongest wind gust 102 km/h at Busselton Jetty on the 13th

Maps
ObservedAnomalyDecile rank
Total
rainfall
Map of Rainfall totals Map of Percentage of normal rainfall Map of Rainfall deciles
Mean
daily
maximum
temperatures
Map of Mean maximum temperature Map of Anomaly in mean maximum temperature Map of Decile rank of mean maximum temperature
Mean
daily
minimum
temperatures
Map of Mean minimum temperature Map of Anomaly in mean minimum temperature Map of Decile rank of mean minimum temperature

Click on a map to show it full size in a pop-up window


Record highest July daily rainfall
New record
(mm)
Old
record
Years of
record
Useless Loop 49.4 on the 17th 42.0 on the 17th in 2016 36



Record highest July temperature
New record
(°C)
Old
record
Years of
record
Average for
July
Narrogin 23.0 on the 27th 22.2 on the 18th in 1976 100 14.6
Albany 23.3 on the 22nd 22.8 on the 21st in 1921 76 15.8
Carnarvon Airport 32.5 on the 3rd 30.9 on the 30th in 2015 74 22.4
Hyden 24.5 on the 27th = 24.5 on the 18th in 2007 48 16.5
Wagin 22.7 on the 27th = 22.7 on the 19th in 1976 47 15.4
Paynes Find 27.9 on the 30th 27.5 on the 29th in 2001 41 18.6
Denham 29.0 on the 4th = 29.0 on the 6th in 2006 32 21.8
Murchison 30.0 on the 30th 29.8 on the 29th in 2016 30 21.1
Mount Magnet Aero 28.4 on the 30th = 28.4 on the 29th in 2016 26 18.9
Newdegate Research Station 22.7 on the 27th 22.3 on the 29th in 2001 25 15.3
Cunderdin Airfield 24.9 on the 27th 24.6 on the 8th in 2006 24 17.0
Dalwallinu 25.3 on the 30th 25.2 on the 18th in 2007 24 16.9
Hopetoun North 26.4 on the 27th 25.7 on the 27th in 2007 24 18.0
Lake Grace 23.5 on the 27th 23.0 on the 29th in 2001 24 15.6
Morawa Airport 28.9 on the 5th 26.8 on the 18th in 2017 24 18.7
Southern Cross Airfield 26.0 on the 27th 24.5 on the 20th in 2002 24 16.7
Shark Bay Airport 30.3 on the 5th 29.3 on the 18th in 2007 21 22.7
North Island 26.6 on the 27th 25.6 on the 18th in 2007 20 21.1



Record highest July mean daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
July
Cape Leeuwin 18.0 17.9 in 2018 123 16.4
Cape Naturaliste 18.3 18.0 in 2007 116 16.4
Narrogin 16.3 = 16.3 in 1977 99 14.6
Dwellingup 16.7 16.6 in 2012 82 15.1
Mullewa 21.5 21.4 in 1994 74 18.9
Carnarvon Airport 26.1 24.8 in 1977 73 22.4
Meekatharra Airport 23.4 22.4 in 1977 70 19.2
Mardie 30.5 30.0 in 1994 64 27.8
Onslow Airport 29.1 27.9 in 2017 54 25.5
Kalbarri 24.4 24.3 in 2007 45 21.8
Learmonth Airport 27.3 26.5 in 2017 45 24.3
Jarrahwood 17.5 = 17.5 in 2018 37 16.5
Denham 23.5 23.2 in 1992 31 21.8
Jandakot Aero 19.1 19.0 in 2007 30 18.0
Murchison 23.8 23.4 in 2017 29 21.1
Laverton Aero 21.4 21.1 in 2018 28 18.5
Bickley 16.1 15.9 in 2012 26 15.1
Leinster Aero 22.1 21.1 in 2002 26 18.9
Bunbury 18.1 = 18.1 in 2014 24 17.3
Paraburdoo Aero 27.8 27.2 in 2002 24 24.9
York 18.2 18.1 in 2018 24 17.1
Morawa Airport 21.0 20.5 in 2007 23 18.7
Newman Aero 25.3 25.1 in 2019 23 23.1
Thevenard Island 27.0 26.4 in 1992 22 24.9
Barrow Island Airport 25.3 24.6 in 2019 21 23.8
Shark Bay Airport 25.0 23.9 in 2019 20 22.7

Highest July mean daily maximum temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
July
Beverley 18.3 19.2 in 1977* 16.9
Brookton 17.4 18.1 in 1977* 16.1
Donnybrook 18.1 =18.1 in 1977* 16.5
Lancelin 21.0 21.4 in 1977* 19.2
Wagin 16.5 16.6 in 1977* 15.4
Pearce RAAF 19.4 19.6 in 1994 17.9
Badgingarra Research Stn 18.8 20.4 in 1994* 17.6
Gingin Aero 19.6 21.3 in 1996 18.3
Rocky Gully 15.5 =15.5 in 1999* 14.7

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




Record highest July daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
July
Meekatharra Airport 17.7 on the 6th 17.1 on the 21st in 2002 71 7.4
Leinster Aero 16.1 on the 17th 16.0 on the 26th in 2011 27 6.1
Swanbourne 16.0 on the 27th 15.8 on the 16th in 2017 27 9.7
Barrow Island Airport 22.4 on the 1st 22.3 on the 2nd in 2016 22 17.5
Varanus Island 24.0 on the 3rd 22.7 on the 4th in 2016 22 19.8



Record highest July mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
July
Esperance 9.4 = 9.4 in 1996 51 8.3



Record highest July mean temperature
New record
(°C)
Old
record
Years of
record
Average for
July
Cape Naturaliste 14.9 = 14.9 in 1992 116 13.4
Carnarvon Airport 19.1 18.7 in 1949 73 16.7
Meekatharra Airport 16.1 15.8 in 2007 70 13.3
Mardie 22.3 21.8 in 2019 63 19.8
Onslow Airport 21.9 20.9 in 2019 54 19.2
Learmonth Airport 19.8 19.6 in 1996 45 17.9
Paraburdoo Aero 19.5 19.2 in 2019 24 17.4
Thevenard Island 22.6 = 22.6 in 1992 22 21.1
Barrow Island Airport 21.6 21.4 in 2007 21 20.7
Shark Bay Airport 18.4 17.9 in 2007 20 16.6

 


Summary statistics for July 2020
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
July
2020
Diff
from
average
Highest for
July
2020
Mean for
July
2020
Diff
from
average
Lowest for
July
2020
Total for
July
2020
Average
for
July
Rank of
July
2020
Fraction of
July
average
North Kimberley (district 01)
Doongan 29.8 0.0 32.1 11th 9.1 -1.7 4.8 29th 0 0.6 lowest 0%
Kalumburu 33.3 +1.0 35.8 2nd 11.6 -2.4 5.7 31st 0 1.4 lowest 0%
Mount Elizabeth 29.1 +0.5 32.0 2nd 6.0 -2.0 1.8 30th 0 3.1 lowest 0%
Troughton Island 29.2 +0.9 31.0 12th 22.6 +0.4 21.1 20th 0 2.6 lowest 0%
Truscott 31.1 +0.3 33.4 12th 17.8 -0.7 14.6 15th 0 1.9 v low 0%
Wyndham Aero 32.1 0.0 34.8 2nd 14.4 -0.9 9.6 15th 0 2.5 lowest 0%
East Kimberley (district 02)
Argyle Aerodrome 30.3 +0.4 33.8 3rd 15.6 -0.3 11.6 14th 0 1.4 lowest 0%
Halls Creek Airport 27.8   31.9 3rd 10.5   4.9 15th 0
Kununurra Aero 31.0 +0.2 33.9 3rd 13.0 -1.9 8.8 15th 0 1.4 lowest 0%
Warmun 29.9 +0.3 34.0 2nd 15.3 +2.6 11.0 14th 0 5.1 lowest 0%
West Kimberley (district 03)
Bidyadanga 31.6 +1.9 34.0 2nd 14.5 +0.4 10.0 31st 0 8.0 lowest 0%
Broome Airport 30.5 +1.5 33.5 4th 13.4 -0.3 8.4 31st 0.2 6.5 average 3%
Curtin Aero 31.5 +0.4 33.6 2nd 15.7 +0.3 10.3 17th 0 7.6 lowest 0%
Cygnet Bay 28.4 +0.2 30.3 4th 14.6 -0.2 11.0 30th 0 10.4 lowest 0%
Derby Aero 31.8 +0.9 34.1 4th 13.8 -0.9 9.5 30th 0 7.6 lowest 0%
Fitzroy Crossing Aero 31.1 +0.1 34.2 3rd 10.8 -1.5 6.3 15th 0 5.5 lowest 0%
Yampi Sound (Defence) 32.8   35.1 3rd 9.3   4.8 16th 0
De Grey (district 04)
Bedout Island 25.5 +0.4 27.4 9th 20.4 +0.8 17.5 20th
Karratha Aero 27.9 +1.5 31.5 4th 15.0 +1.2 11.6 28th 56.0 14.6 v high 384%
Legendre Island 25.6 +0.8 27.2 9th 19.5 +1.5 17.1 19th
Mandora 31.0 +2.0 33.7 4th 12.0 -0.5 6.0 17th 0 8.6 lowest 0%
Marble Bar 29.3 +1.8 31.6 4th 12.6 +0.4 7.2 13th 0 14.2 lowest 0%
Port Hedland Airport 30.0 +2.7 33.6 3rd 13.5 +1.1 8.8 28th 0.2 10.4 low 2%
Fortescue (district 05)
Barrow Island Airport 25.3 +1.5 27.5 10th 17.9 +0.4 14.5 28th 1.0 14.4 average 7%
Karijini North 26.6   28.9 31st     6.9 26th 22.0
Learmonth Airport 27.3 +3.0 31.3 4th 12.1 +0.7 8.3 27th 2.6 21.8 low 12%
Mardie 30.5 +2.7 33.3 4th 14.1 +2.2 10.8 29th 1.2 13.7 average 9%
Onslow Airport 29.1 +3.6 31.9 3rd 14.7 +1.7 11.0 29th 0.2 19.5 low 1%
Thevenard Island 27.0 +2.1 29.0 24th 18.1 +0.7 13.7 29th 0.6 17.2 low 3%
West Gascoyne (district 06)
Carnarvon Airport 26.1 +3.7 32.5 3rd 12.1 +1.2 8.4 20th 27.4 42.7 average 64%
Denham 23.5 +1.7 29.0 4th       30.0 39.3 average 76%
Murchison 23.8 +2.7 30.0 30th 6.3 -0.1 1.5 11th 15.4 27.4 average 56%
Shark Bay Airport 25.0 +2.3 30.3 5th 11.7 +1.2 8.2 20th 35.2 30.1 average 117%
East Gascoyne (district 07)
Newman Aero 25.3 +2.2 28.8 31st 7.4 +1.0 0.3 13th 0 14.4 lowest 0%
Paraburdoo Aero 27.8 +2.9 30.7 30th 11.2 +1.4 6.7 30th 0 13.6 lowest 0%
Murchison (district 07A)
Meekatharra Airport 23.4 +4.2 29.1 31st 8.7 +1.3 4.0 18th 1.2 20.4 v low 6%
Paynes Find 21.0 +2.4 27.9 30th 5.6 +0.1 -1.2 11th 20.8 34.6 average 60%
North Coast (district 08)
Dalwallinu 18.9 +2.0 25.3 30th 6.3 +0.4 1.6 11th 29.2 47.9 average 61%
Geraldton Airport 21.9   27.9 5th 9.7   4.8 24th 43.2
Kalbarri 24.4 +2.6 29.5 5th 10.5 +0.8 5.4 24th 54.9 69.2 average 79%
Morawa Airport 21.0 +2.3 28.9 5th 6.6 +0.5 2.9 9th 21.6 43.2 v low 50%
Mullewa 21.5 +2.6 28.2 5th 8.1 +1.1 4.3 18th 38.1 58.8 low 65%
North Island 22.5 +1.4 26.6 27th 16.2 +0.9 12.8 26th 28.0 64.2 v low 44%
Wongan Hills 18.7 +1.6 24.8 27th 6.5 -0.1 1.6 10th 29.0 69.1 v low 42%
Central Coast (district 09)
Badgingarra Research Stn 18.8 +1.2 23.9 27th 8.4 +1.1 4.7 18th
Bickley 16.1 +1.0 21.5 27th 7.9 +0.7 4.1 11th 132.2 215.1 low 61%
Garden Island HSF 18.6 +0.8 22.5 27th 12.0 +0.8 8.2 10th
Gingin Aero 19.6 +1.3 25.0 27th 7.0 +0.6 0.6 10th
Jandakot Aero 19.1 +1.1 24.0 27th 8.3 +1.4 3.3 25th 107.0 171.7 low 62%
Karnet 16.6 +1.1 21.6 5th 7.1 +0.8 3.1 10th 182.8 217.0 low 84%
Lancelin 21.0 +1.8 25.9 4th 10.8 +0.9 5.1 11th 57.9 119.0 v low 49%
Millendon (Swan Valley) 19.3   24.6 27th 8.6   3.3 24th 59.4
Pearce RAAF 19.4 +1.5 24.9 27th 9.2 +0.8 3.1 24th 68.2 132.8 v low 51%
Perth Airport 19.4 +1.4 25.1 27th 8.6 +0.6 3.6 2nd 70.0 154.2 v low 45%
Perth Metro 19.4 +1.0 24.4 27th 9.1 +1.2 4.3 2nd 83.4 142.3 low 59%
Rottnest Island 18.6 +0.8 22.5 27th 12.9 +0.5 8.9 18th 55.0 111.0 v low 50%
Swanbourne 19.1 +0.7 23.5 5th 10.9 +1.2 6.2 10th 75.2 147.0 v low 51%
South Coast (district 09A)
Albany 17.3 +1.5 23.3 22nd 9.6 +1.4 4.6 12th 133.0 142.6 average 93%
Albany Airport 17.1   22.5 22nd 8.0   0.0 12th 99.2
Bridgetown 16.5 +0.8 20.9 27th 5.3 +0.7 -1.1 11th 125.6 127.8 average 98%
Bunbury 18.1 +0.8 21.8 27th 7.6 +0.5 0.1 12th 129.0 140.1 average 92%
Busselton Aero 17.4 +0.6 20.7 27th 7.1 +0.2 1.3 10th 99.6 131.9 low 76%
Cape Leeuwin 18.0 +1.6 20.4 21st 11.8 +0.5 6.7 11th 138.8 179.2 low 77%
Cape Naturaliste 18.3 +1.9 21.5 22nd 11.5 +1.0 6.6 10th 95.4 159.2 v low 60%
Collie East 17.5 +1.2 21.8 22nd 4.5 +0.5 -2.3 12th 100.2 127.2 low 79%
Donnybrook 18.1 +1.6 22.4 4th       174.8 185.9 average 94%
Dwellingup 16.7 +1.6 21.6 5th 6.5 +1.0 1.4 12th 176.6 233.1 low 76%
Esperance 18.7 +1.5 24.9 30th 9.4 +1.1 4.2 12th 92.2 95.6 average 96%
Esperance Aero 17.3 +0.8 23.0 30th 8.0 +0.4 4.1 12th 66.8 76.8 average 87%
Hopetoun North 18.9 +0.9 26.4 27th 8.1 +0.3 0.8 12th 65.4 66.5 average 98%
Jarrahwood 17.5 +1.0 21.0 27th 5.5 +0.6 -1.2 11th 158.4 179.3 average 88%
Mandurah 18.1 +0.6 20.5 26th 11.2 +0.5 6.9 11th 85.6 115.2 low 74%
North Walpole 16.8 +0.8 21.8 22nd 9.5 +0.6 3.8 11th 199.8 180.1 high 111%
Rocky Gully 15.5 +0.8 20.9 22nd 7.3 +0.8 2.4 11th 83.2 104.0 low 80%
Shannon 15.4 +0.6 20.3 22nd 7.5 +0.9 2.1 11th 176.8 177.7 average 99%
Windy Harbour 17.3 +0.5 21.5 4th 9.6 +1.1 1.0 11th 202.4 196.6 average 103%
Witchcliffe 16.8 +0.4 20.3 22nd 8.6 +0.4 0.9 11th 248.8 192.6 high 129%
North Central (district 10)
Bencubbin 18.2 +1.8 25.0 30th 6.4 +0.4 1.4 11th 27.4 45.0 low 61%
Cunderdin Airfield 18.5 +1.5 24.9 27th 4.9 +0.2 -1.1 11th 14.2 48.9 v low 29%
Merredin 17.9 +1.5 24.1 27th 6.5 +1.0 0.5 10th 35.9 50.1 low 72%
Northam 18.7 +1.8 24.6 27th 4.7 -0.7 -1.5 12th 29.4 81.5 v low 36%
York 18.2 +1.1 23.0 27th 3.0 -0.8 -3.5 12th 40.8 70.3 v low 58%
South Central (district 10A)
Beverley 18.3 +1.4 24.0 27th 5.0 -0.1 -1.8 12th 26.0 76.6 v low 34%
Brookton 17.4 +1.3 23.4 27th 4.5 0.0 -0.5 12th 30.0 84.1 v low 36%
Jacup 16.9 +1.2 23.2 27th 5.7 +0.1 2.4 12th 40.6 49.5 average 82%
Katanning 15.2 +0.5 21.4 27th 6.4 +0.4 1.7 11th 53.8 61.2 low 88%
Lake Grace 16.8 +1.2 23.5 27th 5.5 +0.2 -0.1 11th 20.0 36.0 low 56%
Narembeen 18.4 +1.8 24.5 27th 6.2 +0.8 0.8 10th 26.8 49.1 low 55%
Narrogin 16.3 +1.7 23.0 27th 6.0 +0.8 0.6 10th 34.6 85.5 v low 40%
Newdegate Research Station 16.4 +1.1 22.7 27th 4.6 +0.4 -1.3 12th 28.2 47.4 low 59%
Pingelly 16.5 +1.1 20.6 30th 5.9 +0.4 1.6 18th 30.8 80.6 v low 38%
Ravensthorpe 18.0 +1.6 24.0 30th 7.7 +0.9 4.0 20th 34.1 47.0 average 73%
Wagin 16.5 +1.1 22.7 27th 5.9 +0.3 -0.6 11th 35.0 69.5 low 50%
Wandering 16.5 +0.7 22.1 27th 4.9 +0.9 -0.2 25th 51.8 93.2 low 56%
Eucla (district 11)
Balladonia 19.3 +1.6 27.6 16th 5.0 +0.2 -0.4 25th 8.7 20.4 low 43%
Eucla 19.7 +1.7 28.0 31st 7.4 +0.3 3.7 23rd 8.6 24.8 low 35%
Eyre 20.3 +2.0 30.4 31st 4.1 -1.6 -3.4 4th 22.9 34.3 average 67%
Forrest 20.3 +1.5 27.8 31st 4.5 -0.5 0.0 23rd 0.6 14.2 lowest 4%
Red Rocks Point 19.6 +1.0 29.5 31st 7.7 +0.1 3.3 23rd 0 34.2 v low 0%
South East (district 12)
Bulga Downs 22.0 +2.6 28.2 16th 4.5 -0.3 -0.8 12th 13.4 23.3 average 58%
Kalgoorlie-Boulder Airport 19.0 +2.2 25.8 16th 6.5 +1.4 1.1 25th 18.2 24.1 average 76%
Laverton Aero 21.4 +2.9 28.6 31st 6.5 +0.7 0.2 11th 1.0 15.2 low 7%
Leinster Aero 22.1 +3.2 28.6 31st 6.7 +0.6 1.1 11th 0 16.0 lowest 0%
Leonora Aero 21.7 +2.6 29.0 31st 6.2 +0.3 -0.2 12th 0.8 15.0 v low 5%
Munglinup West 17.9 +1.2 25.8 27th 7.0 +0.4 2.5 12th 38.2 41.1 average 93%
Norseman Aero 18.7 +1.4 24.9 16th 4.4 +0.4 -0.9 12th 20.2 21.5 average 94%
Salmon Gums Res.Stn. 17.7 +1.6 24.1 30th 5.6 +1.0 -1.4 12th 38.0 36.3 average 105%
Southern Cross Airfield 18.6 +1.9 26.0 27th 4.2 +0.6 -1.5 11th 22.8 34.6 low 66%
North East (district 13)
Carnegie 23.4 +2.0 28.5 31st 5.8 -0.2 0.8 13th 1.0 11.6 average 9%
Giles Meteorological Office 21.6 +1.4 25.8 29th 7.0 +0.1 1.4 12th 1.8 10.6 average 17%
Telfer Aero 27.1 +1.6 30.3 4th 11.5 +0.8 6.7 27th 1.6 11.5 average 14%
Warburton Airfield 22.2 +1.3 27.0 31st 7.1 +1.4 1.0 26th 3.2 12.0 average 27%
Wiluna Aero 23.3   29.5 31st 4.8   -0.1 26th 0
Offshore Islands (district 200)
Adele Island 27.4   28.7 4th 22.7   21.1 16th
Browse Island 28.4   29.3 12th 25.3   24.2 15th

Notes

The Monthly climate summary, generally published on the first working day of each month, lists the main features of the weather in Western Australia 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 11 am on Monday 3 August 2020. 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