Western Australia in May 2017: Warm and dry

Rainfall in May was below average to very much below average for much of Western Australia extending from the west to central and to the southeast. Mean maximum temperatures were above average across most WA, while below average mean minimum temperatures were evident in the north and east.

Below average rainfall for western and central WA

  • May rainfall for WA was the 13th-driest since comparable records commenced in 1900
  • The northern dry season began with only isolated falls from shower and thunderstorm activity in the west Kimberley at the start of the month
  • Very much below average rainfall was recorded in western and central WA; some sites had their driest May or driest May for over 20 years with rainfall totals less than 10 mm
  • Rainfall averaged across the South West Land Division (SWLD) was below average, though a number of sites near the SWLD coast had their wettest May for at least 20 years
  • A daily rainfall of 43.0 mm at Esperance on the 12th was its third wettest May day on record and wettest day for over two years, since 20 October 2014 when 44.4 mm was recorded

Warmer days across most WA; cooler nights mostly in the north and east

  • The WA mean maximum temperature was 1.6 °C above average, the seventh-highest on record and highest for nine years since 2008
  • The SWLD mean maximum was 1.4 °C above average, the warmest May for five years since 2012
  • A very cold day with daily maxima in the low teens was recorded in the southwest forested areas on the 21st after the passage of a cold front
  • The WA mean minimum temperature was 0.6 °C below average; The SWLD mean minimum was 0.1 °C below average
  • Sub-zero temperatures were recorded in the South West and Southeast Coastal districts in early May, and in the southern Goldfields and Southeast Coastal at the end of May

Further information

Media
(03) 9669 4057
Enquiries

Extremes in May 2017
Hottest day 37.4 °C at Mandora on the 8th
Warmest days on average 35.0 °C at Wyndham Aero
Coolest days on average 18.0 °C at Shannon
Coldest day 11.5 °C at Manjimup on the 21st
Coldest night -0.2 °C at Jarrahwood on the 1st
-0.2 °C at Salmon Gums Res.Stn. on the 2nd
-0.2 °C at Norseman Aero on the 30th
Coolest nights on average 6.1 °C at Collie East
6.1 °C at Yeelirrie
Warmest nights on average 27.2 °C at Browse Island
21.4 °C at Truscott
Warmest night 28.1 °C at Browse Island on the 30th
Warmest on average overall 28.9 °C at Troughton Island
27.1 °C at Truscott
Coolest on average overall 13.0 °C at Bridgetown
Wettest overall 153.5 mm at Huntly
Driest overall 0 mm at multiple sites
Wettest day 55.6 mm at Bremer Bay on the 11th
Strongest wind gust 106 km/h at Browse Island on the 2nd

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 May daily rainfall
New record
(mm)
Old
record
Years of
record
Beaumont West 50.0 on the 12th 37.4 on the 24th in 2010 36



Highest May total rainfall for at least 20 years
Observed
(mm)
Most recent
higher
Average for
May
Denbarker 125.0 175.2 in 1994 85.0
The Duke 86.6 92.0 in 1997 71.9



Record lowest May total rainfall
New record
(mm)
Old
record
Years of
record
Average for
May
Arena 2.6 8.4 in 2000 37 56.8
Mount Gibson 1.6 2.2 in 2008 35 40.2
Waeel 8.4 11.6 in 2009 21 37.9
Cunderdin Airfield 8.8 = 8.8 in 2006 20 31.7

Lowest May total rainfall for at least 20 years
Observed
(mm)
Most recent
lower
Average for
May
Kalgoorlie-Boulder Airport 0.2 0.0 in 1948 25.4
Bencubbin 2.8 0.0 in 1948* 36.6
Hillcroft 6.8 5.3 in 1961* 57.4
Goodlands 2.2 0.5 in 1964 42.3
Moningarin 6.2 2.5 in 1964 41.9
Coorow 6.0 4.4 in 1964* 49.7
Spring Valley 7.0 4.6 in 1966* 39.8
Xantippe 1.2 0.0 in 1964* 35.8
Ardath 9.6 6.6 in 1966* 43.2
Doongin Peak 8.4 5.4 in 1985 41.0
King Rocks 6.0 5.8 in 1985 38.1
Tammin 7.6 4.6 in 1985 42.3
Kalbarri 9.5 2.3 in 1985* 55.2
Coodernuppin 8.4 6.1 in 1992* 36.9
Leinster Aero 0.2 0.0 in 1996* 16.2

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




Summary statistics for May 2017
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
May
2017
Diff
from
average
Highest for
May
2017
Mean for
May
2017
Diff
from
average
Lowest for
May
2017
Total for
May
2017
Average
for
May
Rank of
May
2017
Fraction of
May
average
North Kimberley (district 01)
Kalumburu 34.1 +0.6 36.4 24th 16.7 -0.4 12.5 12th 0 18.9 v low 0%
Troughton Island 31.9 +0.8 33.5 9th 25.9 +0.5 24.1 21st 0 41.4 lowest 0%
Truscott 32.9 +0.7 35.0 24th 21.4 -0.3 18.7 12th 0 26.2 v low 0%
Wyndham Aero 35.0 +0.9 37.3 23rd 18.4 -1.0 13.3 12th 0 12.2 lowest 0%
East Kimberley (district 02)
Argyle Aerodrome 32.8 +0.8 35.3 7th 19.0 -0.2 15.4 16th 0 8.4 lowest 0%
Halls Creek Airport 31.0   34.0 24th 12.7   8.1 12th 0
Kununurra Aero 33.7 +0.8 36.1 23rd 17.3 -1.5 12.0 12th 0 7.1 lowest 0%
Warmun 32.9 +0.6 35.5 24th 15.9 -1.4 10.0 12th 0 10.2 lowest 0%
West Kimberley (district 03)
Bidyadanga 33.9 +1.5 36.4 26th 16.9 -1.6 11.5 20th 0 25.2 lowest 0%
Broome Airport 32.6 +1.0 34.9 25th 17.2 -1.1 12.4 21st 0.4 27.2 average 1%
Curtin Aero 33.0 -0.3 35.3 24th 17.5 -1.6 12.0 12th 1.6 14.3 average 11%
Cygnet Bay     33.0 26th 17.2 -2.0 11.5 31st 22.4 42.1 average 53%
Derby Aero 33.4 +0.5 36.2 25th 16.7 -2.3 12.7 20th 18.2 19.5 high 93%
Fitzroy Crossing Aero 34.2 +1.0 36.8 7th 14.7 -1.5 11.2 20th 0.6 15.4 average 4%
De Grey (district 04)
Karratha Aero 31.1 +1.1 33.8 27th 17.2 -1.1 14.5 23rd 0 28.3 lowest 0%
Mandora 34.2 +2.1 37.4 8th 15.3 -1.6 8.0 20th 0 25.0 lowest 0%
Marble Bar 31.9 +0.9 34.4 27th 15.2 -2.0 11.6 20th 0 13.2 v low 0%
Port Hedland Airport 31.9 +1.3 34.4 26th 16.8 -0.5 13.4 20th 0.4 27.4 low 1%
Roebourne Aero 32.8 +1.2 35.1 8th 15.2 -1.7 12.4 23rd 0 27.4 v low 0%
Fortescue (district 05)
Barrow Island Airport 28.6 +1.2 31.2 9th 21.1 -0.2 19.3 30th 0 54.8 v low 0%
Learmonth Airport 30.4 +1.9 33.8 5th 14.8 -1.3 11.2 22nd 0 42.7 lowest 0%
Mardie 33.1 +1.7 36.0 9th 15.5 -1.5 11.7 23rd 0 37.1 lowest 0%
Onslow Airport 31.7 +2.5 35.9 9th 17.5 +0.1 15.2 24th 0.6 49.0 v low 1%
Wittenoom 29.8 +2.0 32.0 16th 15.6 -0.6 11.3 23rd 0.4 27.5 low 1%
West Gascoyne (district 06)
Carnarvon Airport 28.0 +1.8 35.4 7th 14.1 -0.7 9.8 23rd 0.8 33.5 low 2%
Denham 26.8 +1.2 35.0 7th 15.4 -1.0 12.0 13th 5.4 36.7 low 15%
Murchison     31.0 1st 9.9 -1.4 5.0 23rd 0 17.5 lowest 0%
Shark Bay Airport 28.5 +1.3 34.5 7th 13.4 -1.2 10.3 13th 4.8 23.7 low 20%
East Gascoyne (district 07)
Newman Aero 27.7 +0.7 30.0 27th 11.2 -0.8 6.5 18th 10.6 19.5 average 54%
Paraburdoo Aero 30.1 +1.1 32.8 9th 13.6 -1.2 9.1 22nd 0 18.2 lowest 0%
Murchison (district 07A)
Meekatharra Airport 26.0 +2.2 31.1 9th 11.7 -0.4 7.2 23rd 0 22.4 lowest 0%
Mount Magnet Aero 25.1 +1.3 30.3 9th 10.9 -0.8 5.9 23rd 0.8 17.4 low 5%
Paynes Find 24.6 +1.5 30.7 4th 8.1 -1.4 1.6 28th 1.2 36.7 v low 3%
North Coast (district 08)
Dalwallinu 23.1 +1.1 30.4 7th 8.7 -1.3 3.4 26th 10.2 35.2 low 29%
Geraldton Airport 25.9   34.0 7th 11.4   6.1 11th 29.6
Kalbarri 27.4 +1.5 34.4 2nd 12.4 -0.9 6.0 18th 9.5 55.2 v low 17%
Morawa Airport 24.8 +0.9 31.6 7th 9.3 -1.2 4.3 29th 8.8 37.4 low 24%
Mullewa 25.4 +1.7 31.8 4th 11.3 +0.1 8.1 19th 5.0 46.4 v low 11%
North Island 24.9 +0.6 28.8 7th 18.1 -0.3 12.9 18th 12.6 44.3 v low 28%
Wongan Hills 22.8 +1.3 30.5 7th 9.8 -0.1 6.0 27th 20.0 51.8 low 39%
Central Coast (district 09)
Badgingarra Research Stn 23.8 +1.4 31.9 7th 10.6 0.0 6.9 26th 18.6 69.2 v low 27%
Bickley 19.5 +0.3 27.2 7th 10.3 +0.1 6.2 29th 97.0 131.5 average 74%
Garden Island HSF 21.3 0.0 27.2 3rd 14.1 +0.2 10.2 28th 58.8 77.4 low 76%
Gingin Aero 23.4 +0.7 32.3 7th 8.7 -0.4 2.4 12th 51.4 75.6 low 68%
Gosnells City 23.0 +0.4 30.5 7th 13.2 +1.5 9.5 25th 68.6 104.0 low 66%
Jandakot Aero 22.4 +0.4 29.7 7th 10.2 +0.9 4.1 28th 73.8 107.2 average 69%
Jurien Bay 23.6 +0.4 29.0 1st 11.4 -0.4 4.0 28th 28.4 77.2 v low 37%
Lancelin 23.2 +0.5 28.8 3rd 13.0 +0.6 7.2 28th 40.1 80.7 low 50%
Medina Research Centre 23.1 +1.1 30.1 7th 10.6 +0.1 5.6 29th 66.1 98.2 low 67%
Millendon (Swan Valley) 23.5   31.4 7th 10.3   4.5 28th 55.2
Pearce RAAF 23.7 +1.8 32.4 7th 10.3 -0.4 3.8 28th 41.2 84.3 low 49%
Perth Airport 22.9 +1.2 30.9 7th 11.1 +0.7 4.7 28th 53.6 98.8 low 54%
Perth Metro 22.7 +0.5 30.8 7th 11.0 +0.5 4.9 28th 70.8 116.9 low 61%
Rottnest Island 21.3 +0.2 27.2 7th 15.2 0.0 12.2 28th 56.0 74.9 average 75%
Swanbourne 22.0 -0.2 28.0 7th 12.7 +0.1 7.2 28th 71.0 91.6 low 78%
South Coast (district 09A)
Albany 19.4 +0.8 27.0 3rd 12.1 +1.4 7.8 13th 67.0 115.9 low 58%
Albany Airport 19.8   27.0 3rd 8.9   3.5 13th 59.2
Bridgetown 19.5 0.0 27.1 7th 6.5 -0.4 1.3 1st 56.4 100.8 low 56%
Bunbury 20.9 -0.1 26.0 7th 8.8 -0.6 2.6 29th 63.0 99.0 low 64%
Cape Leeuwin 19.8 +0.6 27.1 7th 13.7 0.0 11.2 22nd 106.0 138.1 average 77%
Cape Naturaliste 20.8 +1.6 25.0 3rd 13.0 +0.4 9.0 27th 56.8 114.8 low 49%
Collie East 20.4 +0.5 27.0 7th 6.1 -0.1 0.3 29th 93.8 95.3 average 98%
Donnybrook 21.0 +1.0 28.2 7th 8.7 +0.5 2.3 22nd 98.8 134.8 average 73%
Dwellingup 19.9 +1.4 26.9 7th 8.5 +0.8 2.8 28th 151.8 158.1 average 96%
Esperance 20.1 -0.3 29.6 4th 11.6 +0.5 6.5 18th 78.0 72.1 average 108%
Esperance Aero 20.5 +0.3 29.0 4th 10.1 -0.5 5.4 22nd 46.4 65.9 average 70%
Hopetoun North 21.0 0.0 31.3 8th 11.2 +0.9 5.2 30th 71.0 47.1 high 151%
Jarrahwood 20.1 +0.2 26.0 7th 6.2 -0.6 -0.2 1st 92.6 126.5 low 73%
Mandurah 21.0 -0.1 25.2 2nd 13.6 +0.1 9.3 28th 59.6 92.2 low 65%
Manjimup 18.7 +1.0 26.4 7th 9.0 +0.1 5.4 12th 61.8 129.2 v low 48%
North Walpole 19.3 +0.3 27.0 7th 11.0 -0.3 6.7 12th 115.8 127.1 average 91%
Rocky Gully 18.3 -0.2 26.2 7th 8.9 -0.4 2.6 12th 62.6 76.3 average 82%
Shannon 18.0 -0.1 25.7 7th 8.9 0.0 4.4 12th 87.8 122.1 low 72%
Witchcliffe 19.4 -0.3 25.0 7th 9.7 -0.1 4.4 30th 115.2 140.0 low 82%
North Central (district 10)
Bencubbin 21.6 +0.8 29.0 7th 9.9 +0.7 3.9 28th 2.8 36.6 v low 8%
Cunderdin Airfield 22.6 +0.9 30.8 8th 7.6 -0.8 0.9 28th 8.8 31.7 lowest 28%
Merredin 21.6 +0.9 29.0 8th 9.2 +0.3 4.3 26th 27.6 40.6 average 68%
Northam 22.8 +1.6 31.3 7th 7.9 -0.5 3.4 18th 18.7 55.0 low 34%
York 22.7 +0.9 31.0 8th 6.8 -0.2 1.5 28th 20.6 44.7 low 46%
South Central (district 10A)
Beverley 22.1 +0.7 30.6 8th 7.9 0.0 2.6 28th 28.8 53.4 low 54%
Brookton 21.1 +0.7 29.5 8th 8.0 +0.3 3.5 28th 22.5 56.8 low 40%
Corrigin 21.0 +1.3 29.7 8th 8.1 +0.5 1.2 29th
Hyden 21.4 +0.6 30.0 8th 8.6 +1.0 0.4 29th 18.6 39.0 low 48%
Jacup 19.6 -0.1 29.5 8th 8.3 -0.2 3.6 30th 30.8 32.4 average 95%
Katanning 19.4 +0.2 27.8 8th 8.1 -0.6 3.3 29th 32.0 48.0 average 67%
Lake Grace 20.1 +0.1 29.2 8th 8.5 -0.3 2.7 29th 33.8 30.9 average 109%
Narembeen 21.6 +0.7 29.6 8th 8.8 +0.6 2.1 29th 17.6 39.1 low 45%
Narrogin 20.1 +1.5 28.1 8th 7.9 +0.1 1.9 29th 50.4 62.6 average 81%
Newdegate Research Station 20.4 +0.5 29.8 8th 6.6 -0.7 0.8 29th 32.2 42.7 average 75%
Ongerup 19.4 +0.5 28.6 8th 8.3 -0.3 3.0 13th 14.6 43.6 v low 33%
Ravensthorpe 20.1 +0.1 29.5 8th 10.1 +0.5 4.5 30th 27.8 44.1 average 63%
Wagin 20.0 +0.6 28.0 9th 8.9 +0.9 3.7 29th 33.3 54.2 low 61%
Wandering 20.6 +0.7 28.5 8th 6.5 +0.2 0.5 28th 63.4 56.3 average 113%
Eucla (district 11)
Eucla 22.0 +0.9 28.8 15th 10.2 -0.4 4.5 25th 12.8 31.1 low 41%
Eyre 22.6 +1.2 28.7 15th 7.9 -1.2 0.0 24th 16.0 38.6 low 41%
Forrest 23.0 +0.7 29.9 15th 7.8 -1.1 2.8 30th 4.2 18.5 low 23%
Red Rocks Point 21.7 +0.4 29.6 15th 11.2 -0.2 5.9 23rd 18.6 31.1 low 60%
South East (district 12)
Bulga Downs 24.2 +0.3 29.9 9th 7.1 -2.2 2.0 23rd 0 25.1 lowest 0%
Kalgoorlie-Boulder Airport 21.2 +0.5 28.3 9th 8.9 +0.2 3.2 29th 0.2 25.4 v low 1%
Laverton Aero 23.0 +0.8 28.4 5th 9.0 -1.5 2.7 23rd 6.2 15.2 low 41%
Leinster Aero 23.9 +0.8 28.6 10th 9.1 -1.5 2.9 23rd 0.2 16.2 low 1%
Leonora Aero 23.2 +0.1 28.5 9th 8.5 -1.5 3.3 23rd 0.6 11.3 low 5%
Munglinup West 20.2 -0.3 29.5 8th 9.5 -0.2 3.1 22nd 25.2 40.6 average 62%
Norseman Aero 20.0 -1.0 26.9 8th 6.6 -0.5 -0.2 30th 40.2 20.2 high 199%
Salmon Gums Res.Stn. 20.0 +0.2 28.1 8th 7.4 +0.2 -0.2 2nd 51.0 34.3 high 149%
Southern Cross Airfield 21.3 0.0 28.6 8th 7.4 -0.1 0.9 29th 19.2 28.7 average 67%
Yeelirrie 24.8 +1.3 30.0 9th 6.1 -2.2 1.0 23rd 0 24.7 lowest 0%
North East (district 13)
Giles Meteorological Office 25.4 +1.7 28.9 16th 10.5 -0.9 6.0 20th 0 21.2 lowest 0%
Telfer Aero 30.3 +1.3 32.7 8th 15.6 +0.1 10.2 20th 0 19.5 lowest 0%
Warburton Airfield 25.5 +1.2 29.5 15th 9.2 -1.4 3.8 19th 0 15.9 lowest 0%
Wiluna 25.3 +1.5 30.0 9th 10.5 +0.5 6.0 18th 0.2 25.5 v low 1%
Offshore Islands (district 200)
Browse Island 29.8   30.6 9th 27.2   21.9 2nd
Rowley Shoals 28.6   29.7 2nd     0.6 31st
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.
From 2017 on, information about Cocos and Christmas Islands can be found in the climate summary for the Remote Islands and Antarctica

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 Thursday 1 June 2017. 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.

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.
From 2017 on, information about Cocos and Christmas Islands can be found in the climate summary for the Remote Islands and Antarctica

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