Western Australia in March 2017: Wet in northwest and central WA

March rainfall was above average for much of Western Australia, with some parts of the State's inland and southwest having one of their wettest March's on record. Both State-wide mean maximum and minimum temperatures were above average, despite parts of the Lower West district having their mildest March for over two decades.

Above average rainfall for much of WA

  • March rainfall averaged across WA was 43 % above average
  • A low developing in a trough along the west coast produced thunderstorms with moderate to heavy falls in the Southwest district in late March; a number of March daily rainfall records were reported on the 22nd
  • A tropical low moved across the Pilbara coast late in the month, and the low and associated cloudband brought moderate to heavy rainfall to northwest, central, and southeast parts of the State; some locations in the Goldfields had their March daily rainfall on record on the 25th
  • Port Hedland Airport recorded 278.2 mm over three days from the 22nd to 24th as the tropical low moved close to the town. It was the airport's highest three-day rainfall total for 28 years, since 324.0 mm was recorded on 24-26 February 1989 from a tropical low. Port Hedland Airport's March total of 368.0 mm was its 2nd-highest March total since records commenced in 1943, only behind 427.2 mm in March 2007, and 3rd-highest total for any month (highest monthly total was 453.5 mm on January 1967).
  • A very wet second half of the month resulted in some Goldfields sites having their highest March rainfall on record; or highest March rainfall for at least 50 years
  • A few sites in the Southwest, southwest Great Southern, and western South Coastal districts recorded their wettest March, or wettest March for at least 40 years

Days warmer in southeast but cooler in southwest; warmer nights for much of WA away from the west coast

  • Mean maximum and minimum temperatures averaged across WA was 0.5 °C and 0.6 °C above average for March respectively
  • Goldfields, Eucla and Southern Interior districts, as well as pockets in the State's northwest saw 1 °C to 3 °C above average maximum temperatures; Giles Meteorological Office recorded its highest March mean daily maximum temperature for 31 years
  • Below average maxima were recorded in the east Pilbara, west Casoyne, and the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay); the mean maximum temperature averaged across the Lower Southwest was 1.2 °C below average, and some sites had their coolest March days for over two decades
  • Most of the State saw above average mean minima in March, however much of the South West Land Division was close to normal
  • A few cold nights were experienced in the southern WA in the second half of the month, and a number of record low March temperatures were recorded on the 20th and last two days
  • A number of sites including Cape Leeuwin had its coolest March nights for 24 years

Tropical low impacts the Pilbara coast; Tropical cyclones Blanche and Caleb

  • Tropical cyclone Blanche developed northwest of Darwin on the 5th and tracked southwestward over the north Kimberley on the the 6th as a category 2 system before weakening rapidly over land. Minor damage was reported at the Berkeley River Lodge, whilst heavy rainfall led to minor to moderate flooding in some Kimberley river systems.
  • A tropical low crossed the coast west of Port Hedland on the 23rd, and weakened and dissipated while moving southeast into central WA. The low and associated cloudband produced heavy rainfall, flash flooding and severe winds in the Pilbara and central WA
  • Tropical cyclone Caleb developed in the tropical Indian Ocean about 400 km east of Cocos Islands on the 23rd and moved southward then westward before dissipating, with no direct impact on Christmas Island or the Cocos Islands

Further information

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Extremes in March 2017
Hottest day 44.6 °C at Mandora on the 5th
Warmest days on average 37.6 °C at Learmonth Airport
Coolest days on average 21.7 °C at Cape Leeuwin
Coldest day 16.4 °C at Bickley on the 18th
16.4 °C at Rocky Gully on the 26th
16.4 °C at Shannon on the 26th
Coldest night 1.6 °C at Salmon Gums Res.Stn. on the 30th
Coolest nights on average 11.6 °C at Newdegate Research Station
Warmest nights on average 27.4 °C at Troughton Island
Warmest night 30.0 °C at Barrow Island Airport on the 7th
30.0 °C at Legendre Island on the 7th
29.7 °C at Broome Airport on the 18th
Warmest on average overall 31.3 °C at Marble Bar
31.3 °C at Telfer Aero
Coolest on average overall 17.1 °C at Albany Airport
Wettest overall 368.0 mm at Port Hedland Airport
Wettest day 193.0 mm at Yeeda on the 13th
Strongest wind gust 119 km/h at Wyndham Aero on the 15th

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 March daily rainfall
New record
(mm)
Old
record
Years of
record
Edjudina 77.0 on the 25th 75.0 on the 19th in 2012 109
Kookynie 94.0 on the 25th 82.6 on the 16th in 1907 99
Jarrahwood 52.0 on the 22nd 31.0 on the 20th in 1993 42
Perivale Orchard 51.0 on the 22nd 34.9 on the 20th in 1993 40
Paynedale 55.0 on the 22nd 32.3 on the 20th in 1993 39
Bunbury 43.2 on the 22nd 34.0 on the 11th in 1998 22
Willare Bridge 178.0 on the 13th 160.0 on the 4th in 2000 22
Ludlow 40.2 on the 22nd 30.6 on the 27th in 2016 21
Busselton Aero 39.6 on the 22nd 37.0 on the 10th in 1998 20
Packsaddle Farm 58.8 on the 25th 54.8 on the 1st in 2015 20



Record highest March total rainfall
New record
(mm)
Old
record
Years of
record
Average for
March
Kookynie 172.0 169.8 in 1927 102 33.9
Yeelirrie 155.1 151.6 in 2000 89 34.0
Denbarker 156.0 96.0 in 1998 44 35.8
Leinster Aero 193.8 170.0 in 2000 22 38.5

Highest March total rainfall for at least 20 years
Observed
(mm)
Most recent
higher
Average for
March
Edjudina 167.3 180.9 in 1927* 27.7
Cape Leeuwin 91.8 92.5 in 1965 28.5
Wiluna 146.0 147.1 in 1968* 37.4
Lorna Glen 150.5 153.0 in 1965* 39.3
Frankland 43.0 65.5 in 1971* 23.3

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




Highest March mean daily maximum temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
March
Giles Meteorological Office 36.8 =36.8 in 1992 33.7



Record lowest March mean daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
March
Rottnest Island 23.8 24.2 in 1992 27 26.1
Jandakot Aero 27.7 27.9 in 1997 26 29.7
Bickley 25.3 25.4 in 1997 23 28.0
Swanbourne 26.1 27.4 in 1996 23 29.0

Lowest March mean daily maximum temperature for at least 20 years
Observed
(°C)
Most recent
lower
Average for
March
Lancelin 25.9 25.5 in 1968* 28.6
Karnet 25.5 25.3 in 1986* 27.9
Pearce RAAF 28.8 28.6 in 1992 30.6
Denham 29.8 28.0 in 1993 31.1
Perth Airport 28.3 27.7 in 1993 29.7
Gosnells City 28.5 =28.5 in 1993* 30.5
Cape Leeuwin 21.7 =21.7 in 1997 22.7
Dwellingup 25.5 =25.5 in 1997 27.0

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




Record lowest March temperature
New record
(°C)
Old
record
Years of
record
Average for
March
Esperance Aero 5.7 on the 30th 6.9 on the 11th in 2002 26 14.5
Forrest 7.0 on the 31st 7.2 on the 28th in 2008 25 14.5
Rocky Gully 4.2 on the 20th 4.3 on the 28th in 2004 22 12.5
Newdegate Research Station 3.1 on the 20th 3.8 on the 31st in 2012 21 12.7





Lowest March mean daily minimum temperature for at least 20 years
Observed
(°C)
Most recent
lower
Average for
March
Cape Leeuwin 16.2 15.9 in 1993 16.7
Badgingarra Research Stn 15.5 15.0 in 1993* 16.4

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




Highest March mean temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
March
Giles Meteorological Office 29.4 30.2 in 1992 27.2



Record lowest March mean temperature
New record
(°C)
Old
record
Years of
record
Average for
March
Rottnest Island 20.9 21.0 in 1993 27 22.4
Swanbourne 21.6 22.0 in 1996 23 23.2

Lowest March mean temperature for at least 20 years
Observed
(°C)
Most recent
lower
Average for
March
Cape Leeuwin 18.9 18.6 in 1986 19.7
Northam 21.8 21.1 in 1984* 23.1
Brookton 20.6 20.3 in 1993 21.9
Bickley 19.7 19.4 in 1997 21.3
Cape Naturaliste 19.7 19.6 in 1997 19.8
Kalbarri 24.9 24.8 in 1997 25.9
Rocky Gully 17.6 17.3 in 1997 18.8

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




Summary statistics for March 2017
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
March
2017
Diff
from
average
Highest for
March
2017
Mean for
March
2017
Diff
from
average
Lowest for
March
2017
Total for
March
2017
Average
for
March
Rank of
March
2017
Fraction of
March
average
North Kimberley (district 01)
Doongan 33.6 +0.3 38.6 18th 23.0 +1.0 21.7 2nd 222.0 204.5 average 109%
Kalumburu 34.7 +0.8 38.3 3rd 24.7 +1.2 22.3 31st 195.4 219.8 average 89%
Troughton Island 32.5 +0.5 33.9 17th 27.4 +0.8 21.9 18th 81.2 133.1 average 61%
Truscott 32.4 -0.3 35.3 3rd 25.5 +0.3 22.5 31st 150.6 185.3 average 81%
Wyndham Aero 35.9 -0.1 38.6 29th 26.2 +0.5 23.0 16th 201.6 147.4 high 137%
East Kimberley (district 02)
Argyle Aerodrome 35.7 +0.2 39.3 2nd 25.3 +0.5 22.2 14th 194.4 152.6 high 127%
Halls Creek Airport 35.2   38.8 4th 22.9   18.8 2nd 22.2
Kununurra Aero 35.8 +0.1 39.6 4th 25.4 +1.1 23.4 10th 159.2 149.8 average 106%
Warmun 35.6 -0.4 38.5 4th     22.5 1st 195.5 117.7 high 166%
West Kimberley (district 03)
Bidyadanga 35.6 +0.3 42.5 5th 25.5 +0.6 20.4 17th 53.9 95.5 average 56%
Broome Airport 34.0 0.0 39.0 5th 26.2 +0.8 23.7 8th 171.2 99.9 high 171%
Curtin Aero 35.4 -0.8 39.6 5th 24.9 +0.7 21.8 8th
Derby Aero 35.1 -0.2 38.5 5th 25.7 +0.6 22.1 8th 79.0 130.9 average 60%
Fitzroy Crossing Aero 36.9 0.0 40.7 4th 24.2 +0.2 21.1 7th 89.6 115.2 average 78%
De Grey (district 04)
Karratha Aero 36.1 0.0 42.9 5th 26.3 +0.4 24.4 5th 38.2 47.8 average 80%
Legendre Island 34.2   40.5 5th 27.1   24.3 11th
Mandora 36.9 0.0 44.6 5th 25.1 +1.1 20.8 8th 177.2 74.0 high 239%
Marble Bar 37.1 -0.9 41.8 19th 25.4 +0.3 22.8 23rd 108.4 79.4 high 137%
Port Hedland Airport 36.3 -0.5 44.1 3rd 25.9 +1.3 23.3 23rd 368.0 52.0 v high 708%
Roebourne Aero 36.1 -1.7 42.8 6th 25.2 -0.1 22.5 5th 117.0 44.5 high 263%
Fortescue (district 05)
Barrow Island Airport 33.9 +0.7 39.7 6th 27.0 +0.5 24.9 12th 59.0 58.7 high 101%
Learmonth Airport 37.6 +1.2 43.1 3rd 22.8 -0.1 19.8 15th 1.8 41.4 average 4%
Mardie 36.8 -0.8 42.8 7th 25.1 +0.9 21.6 25th 30.4 49.1 average 62%
Onslow Airport 37.4 +1.3 44.2 3rd 25.1 +1.0 21.9 14th 57.8 72.9 average 79%
Wittenoom 35.8 -0.9 40.3 2nd 25.2 +0.9 21.7 23rd 104.2 69.8 high 149%
West Gascoyne (district 06)
Carnarvon Airport 31.5 -0.1 39.0 31st 22.3 +0.2 17.4 22nd 1.4 16.9 average 8%
Denham 29.8 -1.3 37.5 30th 21.7 -0.4 16.5 27th 0 15.0 lowest 0%
Murchison 35.7 +0.4 41.6 4th 20.1 0.0 15.5 22nd 10.8 31.5 average 34%
Shark Bay Airport 33.3 -0.7 42.1 6th 20.1 -1.1 13.9 22nd 0 21.1 v low 0%
East Gascoyne (district 07)
Newman Aero 36.2 +1.1 40.8 2nd 23.1 +1.3 19.7 4th 152.4 44.0 v high 346%
Paraburdoo Aero 36.8 +0.1 40.5 6th 24.0 +0.7 19.5 8th 91.4 50.7 high 180%
Murchison (district 07A)
Meekatharra Airport 34.6 +0.4 41.4 3rd 21.8 +0.5 16.1 27th 84.0 30.2 high 278%
Mount Magnet Aero 34.1 +1.1 40.7 3rd 20.6 +0.5 13.3 27th 3.2 37.3 low 9%
Paynes Find 34.2 +1.3 40.9 4th 18.6 +0.5 9.5 27th 11.2 25.3 average 44%
North Coast (district 08)
Dalwallinu 31.9 +0.4 41.5 4th 15.9 -0.6 7.9 27th 7.2 25.9 average 28%
Geraldton Airport 30.5   40.9 5th 17.2   8.9 28th 5.4
Kalbarri 31.2 -1.4 38.2 6th 18.6 -0.6 13.5 28th 0 12.8 lowest 0%
Morawa Airport 33.9 +0.7 42.4 4th 17.5 -0.5 10.1 27th 4.4 18.2 average 24%
Mullewa 33.9 +0.2 41.5 5th 18.6 +0.2 12.4 27th 6.0 19.5 average 31%
North Island 27.3 -0.9 29.6 5th 21.7 -0.2 18.9 27th 0.2 6.7 low 3%
Wongan Hills 30.9 0.0 41.3 5th 15.6 -0.8 7.8 27th 20.6 20.8 average 99%
Central Coast (district 09)
Badgingarra Research Stn 30.7 -1.2 41.8 5th 15.5 -0.9 7.8 19th 24.6 16.8 high 146%
Bickley 25.3 -2.7 36.6 1st 14.0 -0.6 7.7 27th 45.6 26.3 high 173%
Garden Island HSF 24.5 -2.6 29.7 11th 17.6 -0.7 13.0 27th 24.2 15.7 high 154%
Gingin Aero 28.9 -1.9 40.0 1st 14.4 -0.9 3.6 27th 32.6 21.2 high 154%
Gosnells City 28.5 -2.0 38.6 1st     9.0 27th 19.1 16.9 high 113%
Jandakot Aero 27.7 -2.0 37.1 1st 15.3 -0.1 6.0 27th 33.4 16.6 high 201%
Jurien Bay 27.9 -1.6 36.1 11th 16.4 -0.2 9.6 20th 12.6 14.9 average 85%
Karnet 25.5 -2.4 35.3 1st     10.0 27th 30.0 24.4 average 123%
Lancelin 25.9 -2.7 34.0 12th 16.4 -0.4 10.4 27th 11.6 15.7 average 74%
Medina Research Centre 28.2 -1.2 38.0 4th 15.2 -0.8 6.7 27th 25.8 19.4 high 133%
Pearce RAAF 28.8 -1.8 40.1 1st 15.2 -0.8 5.1 27th 39.8 16.9 high 236%
Perth Airport 28.3 -1.4 38.1 1st 15.5 -0.4 6.3 27th 19.4 16.4 high 118%
Perth Metro 27.9 -1.7 37.7 1st 16.4 -0.3 8.3 27th 23.6 19.5 high 121%
Rottnest Island 23.8 -2.3 27.8 6th 18.0 -0.7 13.7 29th 27.0 18.5 high 146%
Swanbourne 26.1 -2.9 34.1 1st 17.0 -0.4 10.8 27th 28.8 21.9 high 132%
South Coast (district 09A)
Albany 21.8 -0.5 28.9 3rd 15.9 +1.2 8.2 16th 45.8 38.5 high 119%
Albany Airport 22.4   34.0 2nd 12.2   3.8 30th 50.0
Bridgetown 25.6 -1.9 36.6 1st 11.8 0.0 2.3 20th 26.6 20.9 average 127%
Bunbury 26.6 -1.2 35.2 4th 14.1 -0.1 4.8 27th 50.8 19.4 high 262%
Busselton Aero 26.3 -1.6 35.5 1st 13.3 0.0 6.1 20th 51.8 19.2 v high 270%
Cape Leeuwin 21.7 -1.0 32.4 2nd 16.2 -0.5 11.9 16th 91.8 28.5 v high 322%
Cape Naturaliste 24.9 +0.4 34.1 4th 14.6 -0.5 9.0 29th 45.6 22.9 high 199%
Collie East 26.3 -2.1 36.4 1st 12.0 0.0 3.2 19th 12.8 17.7 average 72%
Donnybrook 26.8 -1.2 37.5 1st 13.7 +0.7 6.0 19th 49.6 25.1 high 198%
Dwellingup 25.5 -1.5 35.9 1st 13.2 +0.2 5.4 27th 37.0 26.4 high 140%
Esperance 25.1 -0.1 35.8 17th 15.8 +0.7 9.0 30th 21.8 30.3 average 72%
Esperance Aero 26.0 0.0 35.3 6th 14.3 -0.2 5.7 30th 24.0 34.2 average 70%
Hopetoun North 24.4 -0.3 36.9 17th 15.0 +1.0 7.4 30th 16.2 33.4 average 49%
Jarrahwood 26.6 -1.1 37.0 1st 11.8 +0.2 3.0 16th 69.6 21.7 v high 321%
Mandurah 26.7 -1.1 37.6 4th 17.3 -0.9 12.1 27th 25.8 17.2 high 150%
Manjimup 23.9 -0.9 34.9 1st 12.3 -0.2 6.1 16th 44.4 29.9 high 148%
North Walpole 21.8 -2.2 34.0 2nd 13.6 -0.8 6.4 20th
Rocky Gully 23.3 -1.9 33.4 3rd 11.8 -0.7 4.2 20th 72.8 36.7 high 198%
Shannon 22.1 -2.9 33.1 2nd 12.3 -0.2 4.5 16th 69.2 33.5 v high 207%
Witchcliffe 23.6 -2.2 31.6 2nd 13.0 -0.1 4.3 20th 89.8 26.8 v high 335%
North Central (district 10)
Bencubbin 30.7 0.0 39.5 6th 16.4 +0.1 8.4 27th 2.8 23.4 low 12%
Cunderdin Airfield 29.9 -1.1 40.9 6th 14.8 -0.6 6.4 27th 20.4 19.6 average 104%
Merredin 30.9 +0.6 40.6 3rd 16.3 +0.1 8.4 28th 21.0 21.3 average 99%
Northam 28.9 -1.9 39.4 6th 14.9 -0.5 6.0 27th 21.8 18.8 high 116%
York 29.3 -1.4 39.5 6th 13.5 -0.8 5.0 27th 28.9 19.4 average 149%
South Central (district 10A)
Beverley 29.2 -1.6 38.8 1st 13.8 -0.9 6.0 27th 35.4 16.8 high 211%
Brookton 27.8 -1.7 37.8 3rd 13.5 -0.9 4.4 27th 20.3 18.3 high 111%
Corrigin 28.7 -0.2 39.1 6th 14.1 -0.2 5.5 27th
Hyden 29.6 -0.4 39.4 6th 13.3 -1.0 5.2 27th 18.2 20.8 average 88%
Jacup 25.3 -0.6 38.7 6th 12.2 -0.4 5.0 20th 30.2 29.7 average 102%
Katanning 25.1 -2.1 35.3 3rd 12.3 -0.7 5.2 20th 39.0 22.0 high 177%
Lake Grace 27.1 -1.0 38.7 6th 13.5 -0.9 6.2 20th 23.6 21.2 average 111%
Narrogin 26.5 -0.9 36.6 3rd 13.0 -0.1 5.2 27th 34.6 21.3 high 162%
Newdegate Research Station 27.1 -1.0 37.4 6th 11.6 -1.1 3.1 20th 17.6 22.1 average 80%
Ongerup 24.8 -1.2 36.4 3rd 12.9 -0.4 6.5 27th 30.4 22.4 high 136%
Pingelly     37.4 3rd 14.1 -0.6 8.5 29th 29.4 17.5 high 168%
Ravensthorpe 26.0 -0.6 38.0 6th 13.5 -0.1 6.0 16th 13.8 32.8 average 42%
Wagin 25.9 -1.8 36.0 3rd 13.2 -0.3 5.6 20th 38.6 20.7 high 186%
Wandering 26.5 -2.5 37.2 1st 12.2 -0.4 4.0 27th 26.6 17.3 average 154%
Eucla (district 11)
Eucla 26.1 +1.0 40.0 14th 15.9 -0.1 7.5 31st 8.4 22.8 average 37%
Eyre 27.1 +1.4 43.2 18th 13.4 -0.8 2.8 31st 48.9 27.6 high 177%
Forrest 31.4 +2.2 41.1 14th 14.4 -0.1 7.0 31st 0.4 24.5 v low 2%
Red Rocks Point 25.2 +1.0 39.3 18th 17.1 +0.1 8.7 31st 20.8 23.4 average 89%
South East (district 12)
Bulga Downs 32.4 -0.2 40.7 2nd 18.7 +0.4 11.1 31st 121.4 26.5 v high 458%
Kalgoorlie-Boulder Airport 29.5 +0.1 39.1 2nd 17.2 +1.1 9.3 28th 23.4 25.8 average 91%
Laverton Aero 31.8 +1.4 40.5 2nd 18.8 +0.6 10.3 30th 129.6 44.3 v high 293%
Leinster Aero 32.3 +0.9 40.6 2nd 19.5 +0.5 11.6 31st 193.8 38.5 highest 503%
Leonora Aero 31.4 +0.2 40.8 2nd 19.4 +0.5 11.7 31st 195.8 50.4 v high 388%
Munglinup West 26.7 -0.3 37.6 2nd 13.3 -0.6 6.2 30th 18.4 35.2 low 52%
Norseman Aero 29.4 +0.8 40.0 1st 13.8 -0.3 4.5 30th 19.8 31.1 average 64%
Salmon Gums Res.Stn. 27.0 -0.3 36.1 7th 12.1 -0.5 1.6 30th 31.8 26.6 high 120%
Southern Cross Airfield 30.9 +0.4 39.6 3rd 15.2 -0.1 4.9 27th 10.6 34.8 average 30%
Yeelirrie 33.8 +0.6 41.1 17th 19.1 +0.9 11.0 31st 155.1 34.0 highest 456%
North East (district 13)
Carnegie 36.2 +2.2 41.3 1st 22.6 +2.6 15.3 30th 28.0 33.3 average 84%
Giles Meteorological Office 36.8 +3.1 40.4 26th 21.9 +1.3 16.9 13th 15.8 36.1 average 44%
Telfer Aero 37.3 -0.2 41.1 5th 25.2 +1.1 22.0 30th 45.4 72.2 average 63%
Warburton Airfield 36.5 +2.5 41.4 19th 21.6 +1.6 14.6 31st 17.4 30.3 average 57%
Offshore Islands (district 200)
Browse Island 30.4   32.4 11th 27.2   22.9 19th
Rowley Shoals 30.6   32.4 14th     5.6 30th
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 9 am on Monday 3 April 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