Western Australia in January 2019: warmest January on record; a dry month

The mean maximum temperature for Western Australia was the highest on record for January, while the mean minimum temperature ranked the equal fifth-highest in January on record . Rainfall was below average for many areas, making it the driest January since 2005 when averaged across the State.

Below average rainfall for much of western and southern WA

  • For Western Australia as a whole, rainfall was 41% below average and the driest January since 2005
  • Little or no rainfall was recorded in the west Pillara, Gascoyne and most of the southern half of the State; with several sites near the southern coasts and the Goldfields had their driest January for at least 20 years
  • A late start to the northern wet season saw inland Kimberley received below average rainfall; a number of sites had their driest January since 1998
  • A tropical low, which later developed into Tropical Cyclone Riley, produced isolated very heavy rainfall to the northwest Kimberley coast including 132.0 mm at Troughton Island on the 23rd
  • An unseasonal cut-off low pressure system produced moderate to heavy daily rainfall in the far southwest on the 23rd, with Cape Leeuwin and Witchcliffe having their highest January daily rainfall on record

Warmer than average temperatures across WA away from the west coast and far north

  • For WA, the mean maximum temperature was 2.33 °C above average, the highest in January on record
  • For WA, the mean minimum temperature was 0.86 °C above average, the equal fifth-highest in January on record
  • For WA, the mean temperature (average of maximum and minimum temperature) was 1.58 °C above average, the second-highest on record and highest since 2008
  • Dry and hot conditions in the north saw many inland Pilbara sites having long runs of consecutive days with temperature over 40 °C from the mid-December till late January, while several locations in the Kimberley recorded their highest January temperature on record in early January before the offshore Tropical Cyclone Riley brought cooler conditions
  • Daily maximum temperature reached the high 40s in the State's southeast in early and late January, including a January record of 48.6 °C on the 23rd at Eucla with 100 years of records; 49.1 °C at Red Rock Point on the 23rd, and at Marble Bar on the 13th was the highest temperature of the month for WA
  • Further information about the heatwaves that have affected large areas of the country can be found in the Special Climate Statement 68-Widespread heatwaves during December 2018 and January 2019
  • Hot daytime temperatures followed by cloudy conditions had a number of sites in inland Pilbara and Gascoyne recording daily minima over 33 °C in the first half of the month; Meekatharra Airport's 33.0 °C on the 15th was its all-time highest daily minimum temperature on record
  • In terms of mean maximum temperature, several sites in the State's southeastern quarter had their warmest January on record or warmest for at least 20 years; Giles Meteorological Office's mean 40.6 °C was also its all-time highest on record
  • In terms of mean minimum temperature, several sites in the inland Pilbara and the State's southeast had their warmest January on record; Telfer's mean 28.4°C was not only its January record, but was also its second-highest for any month
  • Surrounded by cooler than average sea surface temperatures, and rare occurrences of late seabreeze onset, a number of sites near the west coast either had their coolest January on record or coolest for at least 20 years for either daytime or overnight temperatures

Tropical cyclone Riley

  • A tropical low was first identified on the 22nd to the north of the Kimberley, and was later named Tropical Cyclone Riley early on the 24th when located to the northwest of Broome. Riley remained offshore during its life span and had minimal impacts on the northwest coastal communities except isolated very heavy falls along the northwest Kimberley coast on the 23rd

Further information

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Extremes in January 2019
Hottest day 49.1 °C at Marble Bar on the 13th
49.1 °C at Red Rocks Point on the 23rd
Warmest days on average 43.7 °C at Marble Bar
Coolest days on average 22.2 °C at Albany
Coldest day 16.2 °C at Manjimup on the 24th
Coldest night 3.9 °C at Wandering on the 25th
Coolest nights on average 11.0 °C at Jarrahwood
Warmest nights on average 28.4 °C at Telfer Aero
Warmest night 33.9 °C at Karijini North on the 10th
Warmest on average overall 35.7 °C at Marble Bar
Coolest on average overall 17.9 °C at North Walpole
Wettest overall 456.0 mm at Kalumburu
Wettest day 132.0 mm at Troughton Island on the 23rd
Strongest wind gust 113 km/h at Giles Meteorological Office on the 26th
113 km/h at Marble Bar on the 31st

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 January daily rainfall
New record
(mm)
Old
record
Years of
record
Cape Leeuwin 57.2 on the 23rd 54.9 on the 31st in 1971 113
Witchcliffe 43.8 on the 23rd 27.8 on the 3rd in 2007 20



Record lowest January total rainfall
New record
(mm)
Old
record
Years of
record
Average for
January
Jacup 0.0 1.2 in 1996 25 31.3
Fitzroy Crossing Aero 57.6 63.4 in 2005 22 176.4

Lowest January total rainfall for at least 20 years
Observed
(mm)
Most recent
lower
Average for
January
Eucla 1.4 0.3 in 1986 15.7
Doongan 78.7 35.7 in 1989 299.1
Laverton Aero 1.2 0.2 in 1996 48.8
Cunyu 6.0 1.6 in 1996* 51.4
Dalyup Park 1.8 0.0 in 1998 21.7
Esperance 0.4 0.0 in 1998 26.2
Salmon Gums Res.Stn. 1.4 0.0 in 1997* 26.2

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




Record highest January temperature
New record
(°C)
Old
record
Years of
record
Average for
January
Eucla 48.6 on the 23rd 48.2 on the 3rd in 2013 100 25.9
Eyre 48.5 on the 2nd 47.7 on the 2nd in 2013 31 26.6
Carnegie 47.8 on the 15th 47.7 on the 8th in 2013 29 38.6
Argyle Aerodrome 44.2 on the 12th 42.6 on the 5th in 2003 25 36.3
Fitzroy Crossing Aero 45.7 on the 12th 44.8 on the 6th in 2016 22 37.4
Kalumburu 40.3 on the 7th 40.0 on the 27th in 2002 21 33.8
Norseman Aero 46.5 on the 13th 45.6 on the 28th in 2011 20 32.5



Record lowest January daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
January
Gosnells City 20.0 on the 23rd 20.3 on the 3rd in 2007 26 33.1



Record highest January mean daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
January
Giles Meteorological Office 40.5 40.3 in 1979 62 37.2
Eyre 31.0 30.7 in 2010 59 26.6
Laverton Aero 38.9 38.3 in 2001 27 35.5



Record lowest January mean daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
January
Swanbourne 27.6 27.8 in 2006 25 29.9

Lowest January mean daily maximum temperature for at least 20 years
Observed
(°C)
Most recent
lower
Average for
January
Lancelin 26.5 26.2 in 1987* 29.1

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




Record highest January daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
January
Meekatharra Airport 33.0 on the 15th 32.9 on the 3rd in 2004 69 24.4
Esperance 25.3 on the 21st 23.8 on the 30th in 2007 50 15.7
Hyden 26.5 on the 13th 26.3 on the 5th in 1977 45 15.6
Esperance Aero 25.2 on the 21st 23.3 on the 11th in 2003 28 15.0
Argyle Aerodrome 31.9 on the 30th 30.8 on the 6th in 1998 25 25.7



Record lowest January temperature
New record
(°C)
Old
record
Years of
record
Average for
January
Brookton 6.5 on the 4th 7.0 on the 25th in 2001 52 15.5
Wandering 3.9 on the 25th 4.3 on the 1st in 2006 21 14.3



Record highest January mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
January
Telfer Aero 28.4 28.2 in 1991 44 26.0
Laverton Aero 23.8 23.7 in 2001 27 21.5
Forrest 18.4 18.2 in 2001 25 16.4
Newman Aero 27.9 27.4 in 2008 22 25.0
Paraburdoo Aero 27.8 27.4 in 2010 22 25.9



Record lowest January mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
January
Lancelin 16.1 = 16.1 in 2015 52 17.6
Perth Metro 16.6 = 16.6 in 2007 25 18.1
Bunbury 13.5 13.9 in 2005 23 15.4
Dalwallinu 16.1 16.5 in 2005 21 18.2
Wandering 12.5 = 12.5 in 2003 20 14.3

Lowest January mean daily minimum temperature for at least 20 years
Observed
(°C)
Most recent
lower
Average for
January
Wongan Hills 16.3 =16.3 in 1987* 17.9
Pearce RAAF 14.7 14.3 in 1990 17.0
Brookton 14.4 14.2 in 1994 15.5
Jarrahwood 11.0 =11.0 in 1993* 12.7

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




Record highest January mean temperature
New record
(°C)
Old
record
Years of
record
Average for
January
Eyre 23.4 23.2 in 2011 59 20.9
Laverton Aero 31.4 31.0 in 2001 27 28.5
Newman Aero 35.1 = 35.1 in 2008 22 32.0



Record lowest January mean temperature
New record
(°C)
Old
record
Years of
record
Average for
January
Swanbourne 22.3 = 22.3 in 2006 25 24.1

Lowest January mean temperature for at least 20 years
Observed
(°C)
Most recent
lower
Average for
January
Lancelin 21.3 21.2 in 1987* 23.4

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




Summary statistics for January 2019
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
January
2019
Diff
from
average
Highest for
January
2019
Mean for
January
2019
Diff
from
average
Lowest for
January
2019
Total for
January
2019
Average
for
January
Rank of
January
2019
Fraction of
January
average
North Kimberley (district 01)
Doongan 34.1 +0.9 39.8 12th 23.3 +0.5 21.0 6th 78.7 299.1 v low 26%
Kalumburu 36.4 +2.6 40.3 7th 24.8 +0.2 22.3 10th 456.0 331.6 high 138%
Troughton Island 32.1 +0.3 33.7 18th 26.5 +0.1 22.7 14th 351.2 273.4 average 128%
Truscott 33.2 +1.1 35.9 20th 25.7 +0.4 22.0 13th 354.8 325.0 high 109%
Wyndham Aero 36.9 +0.6 42.6 12th 26.1 -0.1 22.0 2nd 197.0 200.5 average 98%
East Kimberley (district 02)
Argyle Aerodrome 38.0 +1.7 44.2 12th 26.0 +0.3 21.4 4th 74.0 159.9 low 46%
Halls Creek Airport 38.8   44.0 12th 25.2   20.7 28th 82.8
Kununurra Aero 36.4 +0.6 39.9 30th 25.4 +0.3 22.3 4th 149.2 208.4 low 72%
Warmun 36.7 -0.4 40.7 12th 24.7 0.0 20.3 4th 170.5 181.6 average 94%
West Kimberley (district 03)
Bidyadanga 35.3 +0.9 39.5 14th     25.5 24th 101.0 128.9 average 78%
Broome Airport 34.0 +0.7 38.7 20th 26.8 +0.5 23.1 21st 143.6 190.9 average 75%
Curtin Aero 37.0 +0.7 41.6 12th 25.1 +0.1 21.2 8th 145.2 221.8 low 65%
Cygnet Bay 34.3 +0.7 36.5 21st 26.5 +1.0 22.6 7th 68.0 239.1 low 28%
Derby Aero 36.1 +1.0 39.8 12th 25.9 +0.3 21.8 6th 153.0 203.5 average 75%
Fitzroy Crossing Aero 40.3 +2.9 45.7 12th 25.6 +0.4 21.4 4th 57.6 176.4 lowest 33%
De Grey (district 04)
Bedout Island 33.4 +0.1 35.7 15th 27.2 0.0 25.2 17th
Karratha Aero 36.3 +0.4 40.4 11th 27.8 +1.0 25.1 12th 2.8 47.7 low 6%
Legendre Island 32.3   35.3 21st 27.0   25.0 1st
Mandora 36.9 +0.9 44.7 9th 26.2 +0.8 19.6 9th 65.8 87.4 average 75%
Marble Bar 43.7 +3.0 49.1 13th 27.7 +1.2 23.5 17th 36.4 103.7 low 35%
Port Hedland Airport 37.4 +1.1 43.5 9th 26.8 +1.2 23.8 25th 38.6 63.7 average 61%
Roebourne Aero 39.5 +0.9 46.9 13th 26.9 +0.7 23.8 12th 29.8 74.3 average 40%
Fortescue (district 05)
Barrow Island Airport 33.9 +0.7 39.7 10th 26.1 +0.2 23.4 2nd 16.4 24.7 average 66%
Karijini North 42.5   47.5 13th 27.2   22.5 28th 77.6
Learmonth Airport 39.5 +1.6 46.7 9th 23.1 +0.1 18.2 24th 0 30.5 lowest 0%
Mardie 38.5 +0.6 48.0 10th 26.9 +1.8 24.0 2nd 0.2 38.0 low 1%
Onslow Airport 37.8 +1.4 46.4 10th 25.8 +1.4 22.7 24th 21.4 38.3 average 56%
Thevenard Island 34.2 +1.0 40.8 8th 25.7 +0.3 23.3 24th 12.0 29.8 average 40%
Wittenoom 42.4 +3.0 47.2 13th 27.4 +1.4 22.7 28th 91.6 115.9 average 79%
West Gascoyne (district 06)
Carnarvon Airport 31.9 +0.6 45.3 27th 22.2 -0.4 18.3 24th 2.6 11.6 average 22%
Denham 30.2 -0.5 44.0 27th 21.1 -1.0 18.2 25th 0 7.5 lowest 0%
Murchison 39.8 +0.5 45.8 21st 21.6 -0.9 15.9 24th 0 21.8 lowest 0%
Shark Bay Airport 34.1 +0.1 46.8 20th 20.6 -1.0 17.0 25th 0 8.4 v low 0%
East Gascoyne (district 07)
Newman Aero 42.3 +3.3 46.1 2nd 27.9 +2.9 23.3 26th 23.8 66.9 low 36%
Paraburdoo Aero 43.1 +2.5 46.0 13th 27.8 +1.9 22.0 12th 64.0 55.6 average 115%
Murchison (district 07A)
Meekatharra Airport 41.0 +2.7 46.0 12th 26.1 +1.7 17.4 24th 0.8 29.7 low 3%
Mount Magnet Aero 39.6 +1.7 46.1 12th 23.5 0.0 15.3 24th 0 26.8 lowest 0%
Paynes Find 38.6 +1.2 44.9 12th 20.5 -0.5 13.9 4th 0 20.9 lowest 0%
North Coast (district 08)
Dalwallinu 35.6 +0.4 43.8 21st 16.1 -2.1 11.4 4th 0 24.1 lowest 0%
Geraldton Airport 31.0   45.1 20th 16.8   12.1 25th 0
Kalbarri 33.0 -0.2 44.0 27th 19.3 -0.3 15.0 3rd 0.1 5.4 average 2%
Morawa Airport 37.7 +0.4 44.9 21st 17.8 -2.1 12.6 4th 0 23.1 lowest 0%
Mullewa 36.9 +0.1 44.3 20th 18.2 -1.3 11.9 4th 0 13.7 lowest 0%
North Island 26.5 -1.1 34.0 28th 20.2 -1.1 18.2 4th 0.2 2.8 average 7%
Wongan Hills 35.0 +0.4 43.2 20th 16.3 -1.6 10.5 4th 0 15.3 lowest 0%
Central Coast (district 09)
Badgingarra Research Stn 33.9 -0.7 44.0 20th 15.6 -1.5 10.7 4th 1.2 11.0 average 11%
Bickley 29.7 -0.9 40.4 20th 14.7 -0.7 8.4 4th 13.8 20.8 average 66%
Garden Island HSF 24.6 -2.8 33.0 31st 18.0 -1.0 13.7 25th 1.0 15.6 average 6%
Gingin Aero 31.9 -1.2 44.1 20th 14.3 -2.2 8.6 4th 3.6 16.3 average 22%
Jandakot Aero 30.1 -1.3 42.0 20th 15.0 -1.8 6.8 4th 4.0 16.5 average 24%
Jurien Bay 28.9 -1.1 38.6 19th 16.4 -0.8 11.1 25th 1.0 8.1 average 12%
Lancelin 26.5 -2.6 36.5 28th 16.1 -1.5 10.7 25th 6.8 11.1 high 61%
Millendon (Swan Valley) 32.2   43.9 20th 15.0   8.5 4th 9.6
Pearce RAAF 33.1 -0.4 44.4 20th 14.7 -2.3 10.0 12th 3.8 10.6 average 36%
Perth Airport 31.3 -0.5 42.9 20th 15.8 -1.3 7.0 4th 6.2 11.1 average 56%
Perth Metro 30.5 -0.7 42.1 20th 16.6 -1.5 10.0 4th 7.2 19.7 average 37%
Rottnest Island 24.9 -1.6 35.4 20th 18.1 -1.0 14.1 25th 4.8 16.6 average 29%
Swanbourne 27.6 -2.3 37.7 20th 17.1 -1.2 11.3 25th 5.0 20.3 average 25%
South Coast (district 09A)
Albany 22.2 -0.6 27.0 20th 15.3 +0.1 10.6 27th 14.6 23.8 average 61%
Albany Airport 24.3   31.9 20th 12.7   6.0 27th 15.6
Bridgetown 29.7 -0.3 40.4 20th 11.2 -2.0 4.5 26th 6.8 16.7 average 41%
Bunbury 28.6 -1.2 35.1 6th 13.5 -1.9 7.2 4th 10.6 12.1 average 88%
Busselton Aero 29.4 -0.8 37.2 20th 13.0 -1.3 8.3 4th 21.6 15.3 high 141%
Cape Leeuwin 22.4 -0.7 24.7 19th 16.4 -0.6 13.8 24th 64.8 16.7 v high 388%
Cape Naturaliste 25.2 -0.3 33.2 19th 13.8 -1.4 9.9 30th 22.8 11.0 high 207%
Collie East 30.6 -0.2 40.5 20th 11.7 -1.8 5.3 4th 7.6 20.9 average 36%
Donnybrook 30.2 -0.4 40.0 20th 13.3 -0.8 8.0 4th 7.7 12.7 average 61%
Dwellingup 29.9 +0.2 39.9 20th 13.5 -0.8 7.0 4th 14.4 17.1 high 84%
Esperance 26.4 +0.2 41.8 21st 16.3 +0.6 11.0 27th 0.4 26.2 v low 2%
Esperance Aero 28.9 +1.1 43.4 21st 14.9 -0.1 8.9 27th 2.2 27.0 low 8%
Hopetoun North 24.7 -0.6 32.5 20th 15.5 +0.2 9.5 12th 2.2 35.9 low 6%
Jarrahwood 30.1 +0.4 41.0 20th 11.0 -1.7 4.7 26th 12.0 17.1 average 70%
Mandurah 27.8 -1.7 35.5 19th 17.6 -1.4 13.2 25th 4.2 18.4 average 23%
Manjimup 27.0 -0.2 40.4 20th 12.2 -0.9 8.8 4th 16.4 20.0 average 82%
North Walpole 23.0 -1.4 27.8 19th 12.9 -1.6 8.2 27th 16.0 27.3 average 59%
Rocky Gully 27.0 -0.5 41.8 20th 11.5 -1.2 5.3 27th 9.4 19.2 average 49%
Shannon 25.2 -1.3 37.0 20th 11.5 -1.3 6.8 27th 27.2 17.0 high 160%
Witchcliffe 25.1 -1.4 33.0 20th 12.3 -1.7 7.9 12th 54.6 13.1 v high 417%
North Central (district 10)
Bencubbin 35.0 +0.5 44.0 21st 17.9 -0.3 13.7 4th 1.0 17.2 low 6%
Cunderdin Airfield 35.4 +0.6 44.3 21st 15.6 -1.7 11.3 4th 0 25.1 lowest 0%
Merredin 35.2 +1.3 44.2 21st 18.0 +0.2 13.1 25th 0.6 14.9 low 4%
Northam 34.6 +0.4 44.6 20th 16.2 -1.0 10.1 4th 1.0 12.0 average 8%
York 34.4 +0.2 44.2 20th 15.3 -1.2 8.5 4th 0 31.5 lowest 0%
South Central (district 10A)
Beverley 34.8 +0.5 44.2 20th 15.3 -1.0 8.8 4th 0.4 13.0 low 3%
Brookton 32.9 -0.1 43.1 20th 14.4 -1.1 6.5 4th 0 13.5 lowest 0%
Corrigin 33.2 +0.6 43.1 21st 15.2 -0.7 10.4 25th 0 17.6 lowest 0%
Hyden 35.0 +1.3 45.8 21st 15.1 -0.5 8.1 4th 0 20.1 lowest 0%
Jacup 29.1 +1.3 42.9 20th 12.0 -1.1 5.9 4th 0 31.3 lowest 0%
Katanning 30.2 +0.1 42.2 20th 12.6 -1.1 7.4 4th 1.0 22.5 low 4%
Lake Grace 32.0 +0.9 42.8 21st 14.2 -1.2 8.5 25th 0 35.5 lowest 0%
Narembeen 35.1 +1.1 44.5 21st 15.8 -0.8 10.1 4th 0 17.5 lowest 0%
Narrogin 31.2 +0.2 41.6 20th 13.8 -0.4 7.5 25th 2.0 13.1 average 15%
Newdegate Research Station 32.1 +0.9 43.6 21st     5.7 25th 0 19.2 lowest 0%
Pingelly 32.5 +0.6 42.3 20th 14.5 -1.0 8.9 25th 1.3 11.4 average 11%
Ravensthorpe 29.8 +0.8 41.5 21st 14.5 +0.4 8.3 27th 5.8 24.6 low 24%
Wagin 31.1 0.0 42.3 20th 13.7 -0.9 6.5 25th 1.1 12.9 average 9%
Wandering 31.9 -0.2 43.0 20th 12.5 -1.8 3.9 25th 2.4 16.7 average 14%
Eucla (district 11)
Balladonia 32.7 +1.4 44.7 22nd 14.5 -0.2 10.4 20th 2.1 20.2 low 10%
Eucla 29.3 +3.4 48.6 23rd 18.2 +1.5 10.6 28th 1.4 15.7 low 9%
Eyre 31.0 +4.4 48.5 2nd 15.9 +0.6 8.0 7th 2.1 17.4 low 12%
Forrest 35.3 +2.2 47.5 23rd 18.4 +2.0 11.3 5th 0 24.3 lowest 0%
Red Rocks Point 27.7 +2.6 49.1 23rd 18.8 +0.5 12.7 28th 1.2 24.4 v low 5%
South East (district 12)
Bulga Downs 40.1 +2.3 46.2 13th 23.0 +0.6 15.3 24th 0 30.0 lowest 0%
Laverton Aero 38.9 +3.4 46.9 13th 23.8 +2.3 17.5 5th 1.2 48.8 v low 2%
Leinster Aero 40.2 +3.0 46.9 13th 25.2 +2.0 18.5 24th 0.8 38.1 low 2%
Leonora Aero 39.3 +2.4 46.9 13th 23.9 +1.1 18.4 24th 3.8 47.8 low 8%
Munglinup West 29.5 +0.6 42.2 21st 13.9 -0.6 8.1 27th 3.4 39.7 low 9%
Norseman Aero 34.9 +2.4 46.5 13th 16.0 +0.1 10.4 5th 1.2 36.5 low 3%
Salmon Gums Res.Stn. 32.5 +1.9 44.4 13th 14.2 +0.3 5.1 27th 1.4 26.2 low 5%
Southern Cross Airfield 36.2 +1.5 44.1 21st 17.3 -0.6 13.3 4th 3.0 31.3 low 10%
North East (district 13)
Carnegie 41.6 +3.0 47.8 15th 25.4 +1.5 17.5 28th 12.9 34.5 average 37%
Giles Meteorological Office 40.5 +3.3 45.3 3rd 25.4 +1.9 19.3 28th 27.2 32.5 average 84%
Telfer Aero 42.9 +2.6 46.7 13th 28.4 +2.4 24.2 28th 14.2 62.0 low 23%
Warburton Airfield 40.9 +3.0 47.2 15th 26.1 +3.0 18.9 28th 7.2 30.3 average 24%
Wiluna 40.8 +2.8 46.0 2nd 25.6 +2.7 21.0 29th 16.2 37.2 average 44%
Wiluna Aero 41.2   47.1 13th 25.9   19.8 29th 10.4
Offshore Islands (district 200)
Adele Island 31.3   32.8 20th 26.8   22.6 14th
Browse Island 30.1   31.9 20th 27.0   21.8 2nd
Rowley Shoals 29.7   31.6 20th      
Varanus Island 31.9 0.0 36.7 10th 26.2 +0.1 24.7 2nd 9.6 33.3 average 29%

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 10 am on Friday 1 February 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.

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