Thursday, 10 January 2019 - Annual Climate Summary for Western Australia - Product code IDCKGC51R0

Western Australia in 2018: a very warm year

2018 was a very warm year for Western Australia. Mean maximum temperatures were above average across the State, and the state-wide mean maximum temperature was the fourth-highest on record. Mean minimum temperatures were above average for roughly two-thirds of the State but below average in the Kimberley, and the mean minimum temperature was slightly above average for the State as a whole. Annual rainfall was slightly above average for WA as a whole, but with marked regional variation.

The Australian annual climate statement provides a comprehensive summary of Australia's climate during 2018. Information about changes and long-term trends in Australia's climate can be found in State of the Climate 2018.

Dry in the southwest; wet near the west Kimberley coast

  • Annual rainfall was 10% above average for WA as a whole, but drier than 2016 or 2017
  • Annual rainfall was below average for the South West Land Division as a whole, along the west coast and in inland northeast
  • A very wet year near the west Kimberley coast with most of the rain falling in January and February; Broome Airport and Kito Station had their wettest year on record
  • A cloudband associated with ex-tropical cyclone Joyce brought widespread moderate to heavy falls to the State's southwest with daily totals between 50 and 150 mm in the 24 hours to 9am on 16 January, including many annual daily rainfall records
  • It was a very dry autumn (fifth-driest), and September (third-driest on record, and driest since 1939) for WA as a whole, in contrast to a very wet January (fourth-wettest)

Above average temperatures across most of WA

  • 2018 was Western Australia's equal sixth-warmest year on record overall, with the State's mean temperature 0.81 ºC above average
  • Annual mean maximum temperature was 1.27 °C above average for WA, the fourth-highest on record
  • Annual mean minimum temperature was 0.35 °C above average for WA
  • Extreme high temperatures in the north in middle and late December saw several sites in the Kimberley and Pilbara exceeded their previous annual highest temperature records or highest minimum temperature records
  • A frost event occurred in the South West Land Division in mid-September, with sub-zero temperatures including a number of annual low temperatures records reported on 15 September

Further information

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Extremes Maps Records Summaries Important notes the top

Extremes in 2018
Hottest day 49.3 °C at Marble Bar on 27 Dec
Warmest days on average 37.1 °C at Fitzroy Crossing Aero
Coolest days on average 19.7 °C at Albany
Coldest day 8.4 °C at Shannon on 9 Aug
Coldest night -4.6 °C at Eyre on 7 Sep
Coolest nights on average 8.2 °C at Jarrahwood
Warmest nights on average 25.7 °C at Troughton Island
23.1 °C at Truscott
Warmest night 34.0 °C at Wittenoom on 27 Dec
Warmest on average overall 29.3 °C at Wyndham Aero
Coolest on average overall 14.8 °C at Shannon
Wettest overall 1598.4 mm at Broome Airport
Driest overall 87.0 mm at Barrow Island Airport
Wettest day 439.4 mm at Broome Airport on 30 Jan
Strongest wind gust 169 km/h at Derby Aero on 7 Jan

Extremes Maps Records Summaries Important notes the top

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

Monthly maps
Rainfall rankMaximum temperature rankMinimum temperature rank
January Map of Rainfall deciles Map of Decile rank of mean maximum temperature Map of Decile rank of mean minimum temperature
February Map of Rainfall deciles Map of Decile rank of mean maximum temperature Map of Decile rank of mean minimum temperature
March Map of Rainfall deciles Map of Decile rank of mean maximum temperature Map of Decile rank of mean minimum temperature
April Map of Rainfall deciles Map of Decile rank of mean maximum temperature Map of Decile rank of mean minimum temperature
May Map of Rainfall deciles Map of Decile rank of mean maximum temperature Map of Decile rank of mean minimum temperature
June Map of Rainfall deciles Map of Decile rank of mean maximum temperature Map of Decile rank of mean minimum temperature
July Map of Rainfall deciles Map of Decile rank of mean maximum temperature Map of Decile rank of mean minimum temperature
August Map of Rainfall deciles Map of Decile rank of mean maximum temperature Map of Decile rank of mean minimum temperature
September Map of Rainfall deciles Map of Decile rank of mean maximum temperature Map of Decile rank of mean minimum temperature
October Map of Rainfall deciles Map of Decile rank of mean maximum temperature Map of Decile rank of mean minimum temperature
November Map of Rainfall deciles Map of Decile rank of mean maximum temperature Map of Decile rank of mean minimum temperature
December Map of Rainfall deciles Map of Decile rank of mean maximum 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 daily rainfall
New record
(mm)		 Old
record		 Years of
record
Wanneroo 94.6 on 16 Jan 92.0 on 29 Jul 1987 81
Gidgegannup 114.2 on 16 Jan 113.5 on 29 Jan 1990 61
Bakers Hill 92.2 on 16 Jan 75.3 on 10 Feb 2017 53
Culford 110.8 on 16 Jan 109.0 on 29 Jul 1987 52
Karragullen North 138.6 on 16 Jan 111.0 on 30 Jul 2001 52
Roleystone 139.2 on 16 Jan 135.4 on 9 Feb 1992 52
Subiaco Treatment Plant 132.4 on 16 Jan 98.0 on 29 Jul 1987 52
Bickley 139.2 on 16 Jan 137.0 on 30 Jul 2001 50
Karragullen 147.6 on 16 Jan 141.0 on 29 Jul 1987 47
Pickering Brook 131.4 on 16 Jan 126.4 on 30 Jul 2001 43
Kilto Station 252.0 on 30 Jan 239.0 on 29 Jan 1978 42
Karara 70.8 on 15 Jan 65.8 on 27 Jan 1939 41
Warradarge 92.0 on 3 Jul 91.0 on 7 Feb 2008 39
Fremantle 128.4 on 16 Jan 87.0 on 29 Jul 1987 32
Pickering Brook North 134.6 on 16 Jan 115.0 on 30 Jul 2001 31
Rottnest Island 142.2 on 16 Jan 93.8 on 10 Feb 2017 31
Huntly 144.0 on 16 Jan 128.0 on 10 Feb 2017 29
Nunile 96.4 on 16 Jan 92.0 on 13 Jan 2006 28
Swanbourne 138.6 on 16 Jan 97.4 on 10 Feb 2017 26


Record highest annual total rainfall
New record
(mm)		 Old
record		 Years of
record		 Annual
average
Broome Airport 1598.4 1496.6 in 2000 78 628.1
Kilto Station 1524.5 1280.6 in 1997 27 780.8

Highest annual total rainfall for at least 20 years
Observed
(mm)		 Most recent
higher		 Annual
average
Karnet 1345.4 1509.8 in 1991* 1163.2
Bickley 1273.6 1410.3 in 1996 1083.0
Bulong 484.2 531.4 in 1995* 257.3

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



Record lowest annual total rainfall
New record
(mm)		 Old
record		 Years of
record		 Annual
average
Fitzroy Crossing Aero 306.8 494.8 in 2014 20 701.9

Lowest annual total rainfall for at least 20 years
Observed
(mm)		 Most recent
lower		 Annual
average
Chillinup 259.8 259.2 in 1972* 406.2
Argyle Aerodrome 386.4 352.9 in 1992* 742.7
Warmun 493.5 393.9 in 1992* 724.2

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



Record highest temperature
New record
(°C)		 Old
record		 Years of
record		 Annual
average
Marble Bar* 49.3 on 27 Dec 49.2 on 3 Jan 1922 124 41.6
Wittenoom 47.8 on 27 Dec 47.6 on 2 Jan 1998 68 33.0
Derby Aero 45.6 on 21 Dec 44.9 on 1 Dec 2011 34 34.6
Curtin Aero 46.7 on 21 Dec 45.9 on 30 Nov 2015 28 35.5
Fitzroy Crossing Aero 46.7 on 25 Dec 45.7 on 9 Dec 2009 22 36.1
Kalumburu 43.4 on 15 Oct 42.1 on 2 Nov 2003 21 34.3

* note: Combined observations are from Marble Bar(004106) and Marble Bar Comparison(004020)



Record highest annual mean daily maximum temperature
New record
(°C)		 Old
record		 Years of
record		 Annual
average
Giles Meteorological Office 30.9 30.8 in 1991 61 29.4


Record highest daily minimum temperature
New record
(°C)		 Old
record		 Years of
record		 Annual
average
Telfer Aero 33.7 on 25 Dec 33.4 on 4 Jan 2016 45 19.5
Doongan 31.1 on 21 Dec 30.0 on 25 Oct 1996 31 18.5
Argyle Aerodrome 33.2 on 12 Dec 31.8 on 17 Nov 2013 25 22.2
Kalumburu 29.3 on 13 Dec = 29.3 on 3 Dec 2007 21 20.4


Record lowest temperature
New record
(°C)		 Old
record		 Years of
record		 Annual
average
Ongerup -2.2 on 15 Sep -1.8 on 2 Jul 1982 53 9.8
Kununurra Aero 6.1 on 15 Aug 6.3 on 17 Aug 2014 33 21.2
Curtin Aero 4.2 on 16 Aug 6.2 on 8 Jul 2012 28 21.1
Newdegate Research Station -4.3 on 15 Sep -3.8 on 8 Jul 2013 23 8.7


Lowest annual mean daily minimum temperature for at least 20 years
Observed
(°C)		 Most recent
lower		 Annual
average
Warmun 18.7 17.9 in 1994* 20.3

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



Extremes Maps Records Summaries Important notes the top

Summary statistics for 2018
Maximum temperatures
(°C)		 Minimum temperatures
(°C)		 Rainfall
(millimetres)
Mean
for
2018		 Diff
from
average		 Highest
for
2018		 Mean
for
2018		 Diff
from
average		 Lowest
for
2018		 Total
for
2018		 Average
annual
total		 Rank
of
2018		 Fraction
of annual
average
North Kimberley (district 01)
Kalumburu 35.7 +1.4 43.4 15 Oct 20.0 -0.4 6.8 15 Aug 1452.8 1217.8 high 119%
Troughton Island 31.5 +0.4 35.7 17 Apr 25.7 +0.2 19.9 16 Aug 898.2 811.8 average 111%
Truscott 32.8 +0.1 40.5 28 Oct 23.1 0.0 13.8 16 Aug 1229.8 1126.0 high 109%
Wyndham Aero 36.7 +0.7 45.8 12 Dec 22.0 -0.3 8.5 15 Aug 718.4 853.0 average 84%
East Kimberley (district 02)
Halls Creek Airport 34.6   44.3 25 Dec 18.5   2.4 15 Aug 382.6
Kununurra Aero 35.8 +0.8 44.6 20 Dec 20.2 -1.0 6.1 15 Aug 731.4 841.3 average 87%
Warmun 34.2 -0.9 45.2 20 Dec 18.7 -1.6 5.3 9 Aug 493.5 724.2 low 68%
West Kimberley (district 03)
Broome Airport 32.3 +0.1 42.3 22 Dec 20.8 -0.5 5.7 4 Aug 1598.4 628.1 highest 254%
Curtin Aero 35.5 0.0 46.7 21 Dec 20.2 -0.9 4.2 16 Aug 604.8 827.6 low 73%
Cygnet Bay     38.8 24 Dec 21.2 +0.2 8.0 16 Aug 847.5 791.0 average 107%
Fitzroy Crossing Aero 37.1 +1.0 46.7 25 Dec 19.7 -0.5 4.5 15 Aug 306.8 701.9 lowest 44%
De Grey (district 04)
Bedout Island 30.2   37.3 3 Jan 24.2   16.7 16 Aug
Karratha Aero 32.7 +0.3 43.4 28 Mar 21.0 +0.2 8.0 3 Aug 145.6 296.7 low 49%
Legendre Island 29.9   38.1 23 Apr 22.9   14.4 7 Aug
Mandora 34.3 +0.2 47.0 22 Dec 19.2 -0.2 3.2 8 Aug 764.4 380.4 v high 201%
Marble Bar 35.9 +0.3 49.3 27 Dec 20.1 -0.3 5.9 14 Aug 418.2 394.0 average 106%
Port Hedland Airport 34.3 +1.0 45.3 28 Mar 19.8 +0.3 6.6 7 Aug 202.2 317.7 average 64%
Roebourne Aero 35.4 +0.6 48.9 27 Dec 19.7 -0.1 5.1 7 Aug 131.0 283.2 low 46%
Fortescue (district 05)
Barrow Island Airport 29.5 +0.2 40.3 29 Mar 22.2 -0.1 13.4 8 Aug 87.0 286.4 v low 30%
Learmonth Airport 32.6 +0.7 47.1 27 Dec 17.5 -0.2 5.2 13 Aug 161.2 255.0 low 63%
Mardie     47.7 27 Dec 19.3 +0.4 6.8 12 Aug 101.0 277.3 low 36%
Onslow Airport 32.7 +0.7 49.1 27 Dec 19.8 +0.7 8.2 7 Aug 167.6 311.6 low 54%
Thevenard Island 30.2 +0.4 41.1 23 Jan 21.7 -0.1 10.9 8 Aug 88.0 235.6 low 37%
Wittenoom 34.0 +1.0 47.8 27 Dec 20.2 +0.4 6.4 7 Aug 428.0 461.8 average 93%
West Gascoyne (district 06)
Carnarvon Airport 28.0 +0.7 42.9 20 Dec 17.4 +0.2 4.4 12 Aug 105.8 221.4 low 48%
Denham 26.4 -0.4 42.8 23 Dec 17.8 0.0 9.0 16 Aug 201.6 223.3 average 90%
Shark Bay Airport 28.8 -0.3 46.0 25 Dec 16.2 -0.2 5.0 12 Aug 226.0 208.7 average 108%
East Gascoyne (district 07)
Newman Aero 32.9 +0.9 46.7 30 Dec 17.0 +0.6 1.0 12 Aug 206.4 329.5 low 63%
Murchison (district 07A)
Meekatharra Airport 30.3 +1.3 46.0 26 Dec 16.5 +0.6 2.2 6 Aug 215.8 237.9 average 91%
Mount Magnet Aero 29.3 +0.7 44.7 26 Dec 15.5 +0.3 1.6 11 Aug 256.2 255.9 average 100%
Paynes Find 28.5 +0.6 43.2 3 Jan 13.3 +0.4 0.0 11 Aug 289.6 289.0 average 100%
North Coast (district 08)
Dalwallinu 26.4 +0.1 41.9 25 Dec 11.6 -0.2 0.6 15 Sep
Geraldton Airport 26.3   42.6 13 Jan 13.5   2.4 12 Sep
Kalbarri 27.6 -0.1 43.1 13 Jan 15.2 +0.6 2.6 11 Aug 249.0 341.5 low 73%
Morawa Airport 28.3 +0.1 43.6 2 Jan 12.9 0.0 1.4 11 Aug 327.4 288.0 high 114%
Mullewa 28.5 +0.5 43.0 25 Dec 13.6 +0.4 3.1 11 Aug 310.3 333.5 average 93%
North Island 24.6 -0.2 35.2 13 Mar 18.3 -0.3 7.3 12 Jul 182.4 273.8 v low 67%
Wongan Hills 26.2 +0.5 41.0 2 Jan 11.9 -0.1 2.5 30 Jun 399.2 388.3 average 103%
Central Coast (district 09)
Badgingarra Research Stn     41.1 15 Feb 12.0 +0.1 2.7 13 Sep 375.6 539.2 v low 70%
Bickley 22.2 -0.4 37.9 22 Dec 11.2 -0.1 1.4 15 Sep 1273.6 1083.0 high 118%
Garden Island HSF 22.1 -0.6 40.1 14 Jan 15.0 0.0 5.6 19 Aug 635.6 603.4 average 105%
Jandakot Aero 24.5 -0.1 40.5 22 Dec 12.0 +0.5 1.4 12 Aug 844.0 824.2 average 102%
Lancelin 23.7 -0.5 39.0 13 Mar 13.8 +0.2 3.5 16 Sep 554.1 603.9 average 92%
Millendon (Swan Valley) 25.5   41.3 22 Dec 12.0   1.6 16 Sep 648.6
Pearce RAAF 25.8 +0.6 42.1 22 Dec 12.2 0.0 2.5 16 Sep 682.2 655.1 average 104%
Perth Airport 25.1 +0.6 40.9 22 Dec 12.5 +0.3 2.5 10 Aug 737.2 765.2 average 96%
Perth Metro 24.7 -0.1 41.2 22 Dec 13.0 +0.2 2.8 11 Aug 741.6 733.2 average 101%
Rottnest Island 21.9 -0.3 37.9 22 Dec 15.7 0.0 6.8 10 Aug 592.6 573.3 average 103%
Swanbourne 23.3 -0.8 39.0 22 Dec 14.1 +0.2 5.2 11 Aug 817.4 734.0 high 111%
South Coast (district 09A)
Albany 19.7 +0.2 33.2 17 Oct 12.7 +0.9 4.9 16 Sep 701.2 927.1 v low 76%
Albany Airport 20.8   36.2 22 Dec 10.6   1.1 18 Aug
Bridgetown 22.3 -0.1 38.5 14 Jan 8.4 -0.2 -1.7 18 Aug 703.0 720.2 average 98%
Bunbury 23.0 -0.1 40.6 14 Jan 10.9 -0.2 1.8 15 Sep
Busselton Aero 22.7 -0.4 39.8 14 Jan 10.6 +0.3 0.9 7 Nov 664.8 683.1 average 97%
Cape Leeuwin 20.1 +0.3 33.6 6 Mar 14.6 +0.5 7.5 29 Aug 736.0 958.9 low 77%
Cape Naturaliste 21.6 +0.9 36.9 14 Jan 12.8 +0.1 4.1 15 Sep 573.4 800.7 v low 72%
Collie East 23.0 -0.2 38.3 14 Jan 8.3 -0.2 -2.2 15 Sep 716.6 722.5 low 99%
Donnybrook 23.5 +0.4 39.4 14 Jan 10.6 +0.8 1.0 15 Sep 897.2 972.5 average 92%
Dwellingup 22.5 +0.6 38.4 22 Dec 10.0 +0.4 -0.1 11 Aug
Esperance 22.1 +0.2 41.1 17 Jan 12.5 +0.4 4.8 10 Jul
Esperance Aero 22.7 +0.5 41.5 5 Jan 11.4 +0.1 3.8 15 Sep 651.6 573.1 high 114%
Hopetoun North 21.8 -0.3 38.7 22 Mar 11.9 +0.4 2.9 16 Sep 337.2 496.1 v low 68%
Jarrahwood 23.0 +0.4 38.8 14 Jan 8.2 -0.4 -2.7 15 Sep 975.4 935.1 average 104%
Mandurah 23.0 -0.3 40.3 14 Jan 14.6 -0.2 5.7 10 Aug 659.0 666.7 average 99%
Manjimup 21.0 +0.6 37.7 14 Jan 9.9 +0.2 1.7 15 Sep 820.0 990.0 low 83%
North Walpole 20.1 -0.1 35.9 6 Mar 11.6 -0.1 2.7 18 Aug 902.6 1081.6 low 83%
Shannon 20.0 -0.4 36.3 14 Jan 9.6 -0.1 0.5 18 Aug 1034.0 1010.3 average 102%
Witchcliffe 20.9 -0.5 35.5 22 Dec     0.9 18 Aug
North Central (district 10)
Bencubbin 25.4 0.0 41.5 16 Feb 11.9 +0.2 0.4 11 Aug 288.0 315.6 average 91%
Cunderdin Airfield 26.2 +0.2 43.8 16 Feb 10.6 +0.1 -1.9 15 Sep 281.0 306.9 low 92%
Northam     40.9 16 Feb 10.5 -0.4 0.2 30 Jun 469.5 428.2 high 110%
York     40.5 16 Feb 9.5 -0.1 -2.0 16 Sep 423.4 397.6 average 106%
South Central (district 10A)
Beverley 25.9 +0.5 41.2 16 Feb 10.3 +0.1 -1.4 16 Sep 366.7 418.1 low 88%
Brookton 24.7 +0.4 40.3 16 Feb 9.6 -0.1 -1.5 16 Sep 383.7 450.8 low 85%
Hyden 25.6 +0.5 42.8 3 Jan 10.0 0.0 -2.4 15 Sep 328.6 341.9 average 96%
Jacup 22.5 +0.5 37.4 22 Dec 9.2 -0.1 -1.2 18 Aug 286.6 450.4 v low 64%
Katanning 22.3 -0.2 40.7 16 Feb 9.7 +0.1 -0.8 15 Sep
Lake Grace 23.6 +0.1 42.0 16 Feb 10.3 -0.1 -1.8 15 Sep
Narembeen 25.8 +0.5 42.2 16 Feb 11.0 +0.3 -0.4 15 Sep 321.3 333.5 average 96%
Narrogin 23.2 +0.7 40.2 16 Feb 9.7 +0.3 -1.6 15 Sep 500.9 493.6 average 101%
Newdegate Research Station 23.7 +0.3 40.8 16 Feb     -4.3 15 Sep 230.2 370.0 v low 62%
Pingelly 24.1 +0.7 40.5 16 Feb 9.8 -0.6 0.2 6 Jul 407.6 445.5 average 91%
Ravensthorpe 23.3 +0.5 39.0 23 Dec 10.8 +0.3 2.0 12 Aug 299.2 429.6 v low 70%
Wagin 23.1 +0.1 39.8 16 Feb 10.0 +0.2 -1.5 15 Sep 376.8 431.7 low 87%
Wandering 23.6 -0.1 39.6 22 Dec 8.8 +0.3 -2.3 15 Sep
Eucla (district 11)
Eucla 24.0 +1.3 46.0 18 Jan 12.8 +0.6 1.1 16 Sep
Eyre 24.3 +1.3 43.6 26 Dec 10.6 -0.1 -4.6 7 Sep 407.9 316.3 high 129%
Forrest 26.7 +0.4 45.5 18 Jan 11.2 +0.2 -0.3 11 Jul 345.6 227.5 v high 152%
Red Rocks Point 22.7 +0.2 45.4 5 Jan 13.4 +0.3 1.8 20 Aug 427.2 354.2 high 121%
South East (district 12)
Bulga Downs 29.2 +0.4 45.0 5 Jan 13.5 -0.1 -0.5 6 Aug
Kalgoorlie-Boulder Airport 25.9 +0.6 44.0 5 Jan 12.5 +0.8 0.2 6 Jul 327.8 267.7 high 122%
Laverton Aero 27.9 +0.8 44.9 5 Jan 14.1 +0.1 -1.5 6 Aug 340.6 302.8 high 112%
Leinster Aero 28.9 +0.7 45.0 5 Jan 14.6 -0.1 -0.4 6 Aug 227.6 264.5 average 86%
Leonora Aero 28.3 +0.3 45.5 5 Jan 14.1 -0.4 -0.6 6 Jul 320.4 280.8 average 114%
Munglinup West 23.2 0.0 40.5 16 Feb 10.5 -0.1 1.4 15 Sep 378.8 466.1 low 81%
Norseman Aero 25.5 +0.4 43.6 5 Jan 10.1 +0.2 -3.7 18 Aug 265.6 298.0 average 89%
Southern Cross Airfield 25.9 0.0 43.8 3 Jan 10.9 +0.5 -1.1 11 Aug
North East (district 13)
Carnegie 31.0 +0.5 46.5 27 Dec 15.2 -0.1 -0.8 28 Jun 291.5 242.2 average 120%
Giles Meteorological Office 30.9 +1.5 45.1 28 Dec 15.9 0.0 -1.4 3 Aug 296.4 293.1 average 101%
Telfer Aero 34.7 +0.6 47.4 27 Dec 19.4 -0.1 2.6 6 Aug 357.2 370.9 average 96%
Warburton Airfield 31.2 +1.3 47.4 28 Dec 15.6 +0.7 -3.4 6 Aug
Wiluna 30.4 +1.2 47.0 31 Dec     -1.0 6 Aug 307.4 261.7 average 117%
Wiluna Aero 30.5   46.4 31 Dec 15.4   -0.7 6 Aug 236.8
Offshore Islands (district 200)
Adele Island 29.8   33.0 3 Jan     20.8 13 Jul
Rowley Shoals 28.1   34.4 6 Jan     21.6 20 Aug

Extremes Maps Records Summaries Important notes the top

Notes

The annual climate summary 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.

The Australian annual climate statement provides a comprehensive summary of Australia's climate during 2018. Information about changes and long-term trends in Australia's climate can be found in State of the Climate 2018.

This statement has been prepared based on information available at 3 pm on Thursday 3 January 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