Western Australia in December 2016: Record wet in the far north

December 2016 was the third-wettest December on record for Western Australia, and the wettest for eighteen years. Two tropical lows, including ex-tropical cyclone Yvette, brought record high daily and monthly rainfall totals to parts of the Kimberley in the second half of December. Both mean maximum temperature and minimum temperature were near average for WA in December 2016.

Record wet in parts of the Kimberley

  • December rainfall averaged across WA was very much above normal and the third-highest December rainfall since 1900; only 1930 and 1998 had wetter Decembers
  • Parts of the west Pilbara, Gascoyne, Central West and Eucla recorded notable well below average rainfall
  • Tropical lows that moved through the Kimberley in the second half of the month produced heavy rainfall with daily totals from 50 mm to 220 mm and record high daily totals recorded between the 20th and 23rd; Broome Airport's 225.6 mm on the 23rd was also its third-highest daily total for any month in its 77 years of record
  • Many locations in the Kimberley, including a number of sites with over 100 years of rainfall record, had their wettest December on record while others reported their highest December rainfall since at least 1994, mostly due to the active monsoon trough and associated tropical lows over the region in the second half of December
  • An active trough brought severe thunderstorms with hail and moderate rainfall to parts of the southern South West Land Division and Goldfields at the mid-December; Kalgoorlie-Boulder Airport recorded its highest December daily rainfall in 78 years of record

Near average mean maximum and minimum temperatures

  • Below average maxima were observed in the Kimberley and eastern Interior, and above average maxima recorded in the Gascoyne and parts of neighbouring districts
  • Persistent easterly winds in northwest WA resulted in extreme high temperatures in the Pilbara and Gascoyne in the second half of December with maxima almost reaching 46 °C.
  • Minimum temperatures averaged across WA were also close to normal with above average minima extending southeast from the Pilbara and west Kimberley through inland WA to the Eucla, and below average minima mostly confined to southwest WA
  • Several sites in the Kimberley had their warmest December night on record in early and mid-December; Cygnet Bay's minimum of 32.5 °C on the 18th was a record for December for the site and was also Australia's highest minimum for December 2016
  • Port Hedland Airport recorded 30 nights in December with a minimum of 25.0 °C or higher, its record high number of such nights in December, and consequently it was Port Hedland Airport's highest December mean minimum temperature on record

A significant tropical low and Tropical cyclone Yvette

  • A tropical low deepened to the north of Darwin on the 20th and continued to intensify as it moved southwestward over the northeast Kimberley on the 21st, then moved through the Northern Interior then southeastward through the northeast Southern Interior and into northwest South Australia on the 26th. The system brought record breaking rainfall along its path with daily rainfall totals in the 150 mm to 200 mm range
  • Tropical cyclone Yvette formed off the northwest Western Australia coast on the 21st but weakened below tropical cyclone intensity on the morning of the 23rd as it moved towards the west Kimberley coast and made landfall as a tropical low north of Broome on the 25th. Ex-tropical cyclone Yvette brought heavy rainfall to the west Kimberley before rapidly dissipating

Further information

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Extremes in December 2016
Hottest day 45.7 °C at Onslow Airport on the 19th
Warmest days on average 41.5 °C at Marble Bar
Coolest days on average 20.8 °C at Albany
Coldest day 16.4 °C at Mount Barker on the 12th
16.4 °C at Ongerup on the 12th
16.4 °C at Shannon on the 28th
Coldest night 2.5 °C at Salmon Gums Res.Stn. on the 2nd
Coolest nights on average 10.1 °C at Rocky Gully
Warmest nights on average 27.8 °C at Bedout Island
27.4 °C at Broome Airport
Warmest night 32.5 °C at Cygnet Bay on the 18th
Warmest on average overall 34.2 °C at Marble Bar
Coolest on average overall 17.1 °C at Shannon
Wettest overall 604.0 mm at Theda
Wettest day 225.6 mm at Broome Airport on the 23rd
Strongest wind gust 98 km/h at Giles Meteorological Office on the 25th

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 December daily rainfall
New record
(mm)
Old
record
Years of
record
Myroodah 171.6 on the 23rd 132.1 on the 9th in 1952 99
Yeeda 139.4 on the 22nd 125.0 on the 19th in 2009 96
Kalgoorlie-Boulder Airport 50.6 on the 13th 28.2 on the 4th in 1988 78
Broome Airport 225.6 on the 23rd 210.1 on the 5th in 1970 77
Derby Aero 147.4 on the 22nd 126.8 on the 23rd in 2008 56
Theda 203.0 on the 21st 176.0 on the 16th in 2009 50
Yulmbu 175.2 on the 22nd 83.8 on the 24th in 1960 48
Camballin 118.0 on the 23rd 116.6 on the 13th in 1962 43
Doongan 172.0 on the 21st 148.2 on the 22nd in 2008 29
Carranya 57.0 on the 20th =57.0 on the 6th in 1975 25



Record highest December total rainfall
New record
(mm)
Old
record
Years of
record
Average for
December
Fossil Downs 300.2 284.3 in 2008 107 87.3
Myroodah 480.8 272.6 in 1930 101 77.7
Cherry Tree 76.4 65.2 in 1942 91 15.7
Broome Airport 407.6 278.8 in 1970 77 61.9
Derby Aero 350.6 259.8 in 1957 62 76.4
Udialla 375.2 248.4 in 1998 58 80.1
Yulmbu 347.2 284.3 in 1950 49 98.9
Camballin 371.8 275.2 in 1998 45 90.5
Kilto Station 358.8 298.0 in 1994 36 106.4
Kimbolton 424.0 304.7 in 1973 32 137.6
Doongan 567.7 432.7 in 2008 29 233.3
Drysdale River Station 469.8 386.0 in 1996 29 206.8
Curtin Aero 337.2 254.6 in 2009 23 154.1
Fitzroy Crossing Aero 386.2 304.0 in 2008 20 142.3

Highest December total rainfall for at least 20 years
Observed
(mm)
Most recent
higher
Average for
December
Yeeda 450.8 668.0 in 1906* 94.3
Kojonup 60.6 =60.6 in 1951 15.6
Redlands 43.2 98.7 in 1951 10.0
Jubilee Downs 335.4 457.1 in 1950* 94.2
Bidyadanga 412.4 533.1 in 1971 57.9
Mount Barnett 386.4 513.9 in 1917* 170.1
Gibb River 296.4 354.0 in 1987 126.4
Bulong 54.6 57.8 in 1994 16.5
Mundrabilla Station 58.2 165.4 in 1994 18.8
Cygnet Bay 323.0 416.4 in 1993* 79.0

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





Lowest December total rainfall for at least 20 years
Observed
(mm)
Most recent
lower
Average for
December
Lorna Glen 5.4 0.0 in 1986* 25.9

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




Record highest December daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
December
Troughton Island 30.1 on the 10th = 30.1 on the 23rd in 2005 38 27.3
Cygnet Bay 32.5 on the 18th 30.5 on the 2nd in 2015 31 25.5
Curtin Aero 30.5 on the 9th 29.7 on the 15th in 2009 26 25.1
Mount Elizabeth 27.5 on the 1st 26.4 on the 5th in 1993 24 22.3



Record highest December mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
December
Port Hedland Airport 26.8 26.6 in 2012 68 24.1
Forrest 15.8 = 15.8 in 1994 23 14.9



Summary statistics for December 2016
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
December
2016
Diff
from
average
Highest for
December
2016
Mean for
December
2016
Diff
from
average
Lowest for
December
2016
Total for
December
2016
Average
for
December
Rank of
December
2016
Fraction of
December
average
North Kimberley (district 01)
Doongan 32.8 -1.6 38.0 1st 23.0 -0.1 21.2 22nd 567.7 233.3 highest 243%
Kalumburu 34.0 -1.3 37.9 1st 24.8 -0.1 22.4 1st 479.4 244.6 v high 196%
Troughton Island 32.8 -0.2 35.3 8th 27.3 0.0 24.0 22nd 305.4 123.2 high 248%
Truscott     37.2 1st 26.0 0.0 23.1 22nd 281.0 199.0 high 141%
Wyndham Aero 37.0 -0.8 43.1 1st 27.1 +0.5 23.7 2nd 309.8 151.2 v high 205%
East Kimberley (district 02)
Argyle Aerodrome 36.6 -0.6 42.1 8th 26.4 +0.6 20.9 3rd 174.4 142.1 high 123%
Halls Creek Airport 36.4 -1.4 41.6 8th 25.1 +0.4 22.0 10th 151.4 84.0 v high 180%
Kununurra Aero 37.1 0.0 43.8 8th 25.9 +0.5 22.9 19th 248.6 141.7 high 175%
Warmun 37.1 -1.3 42.5 8th 26.0 +0.8 23.5 20th 269.5 120.1 v high 224%
West Kimberley (district 03)
Bidyadanga 34.5 -0.5 41.7 9th 26.7 +0.9 23.5 23rd 412.4 57.9 v high 712%
Broome Airport 33.8 -0.1 41.9 9th 27.4 +0.9 23.9 11th 407.6 61.9 highest 658%
Curtin Aero 36.3 -2.1 42.0 8th 25.4 +0.3 23.0 28th 337.2 154.1 highest 219%
Cygnet Bay 33.9 -1.0 38.5 9th 26.4 +0.9 22.5 6th 323.0 79.0 v high 409%
Derby Aero 36.0 -1.2 42.7 8th 26.6 +0.3 23.5 11th 350.6 76.4 highest 459%
Fitzroy Crossing Aero 38.0 -1.1 43.0 17th 25.4 -0.3 23.6 15th 386.2 142.3 highest 271%
De Grey (district 04)
Bedout Island 33.6   35.6 9th 27.8   25.7 24th
Karratha Aero 36.4 +0.6 41.2 18th 26.8 +1.3 22.3 6th 5.0 14.0 average 36%
Legendre Island 33.1   36.7 10th 26.6   23.5 5th
Mandora 35.3 -1.5 41.8 9th 26.2 +1.8 22.7 1st 49.6 34.1 high 145%
Marble Bar 41.5 -0.3 45.4 18th 26.9 +0.8 22.2 21st 14.6 32.6 average 45%
Port Hedland Airport 36.6 0.0 42.0 18th 26.8 +2.7 22.6 28th 0.8 18.7 average 4%
Roebourne Aero 39.4 +0.1 44.8 18th 25.9 +1.2 19.8 6th 13.4 14.6 average 92%
Fortescue (district 05)
Barrow Island Airport 33.1 +1.0 38.1 14th 25.6 +1.2 22.7 4th 1.0 5.6 high 18%
Learmonth Airport 38.3 +1.4 45.4 19th 21.0 +0.2 17.1 4th 0 6.2 lowest 0%
Mardie 37.3 -0.2 41.9 18th 24.6 +1.6 19.3 5th 26.4 9.0 high 293%
Onslow Airport 37.7 +1.8 45.7 19th 24.0 +1.7 19.3 4th 0.8 3.4 average 24%
Wittenoom 40.1 +0.4 43.7 18th 25.4 -0.1 21.3 6th 43.0 49.3 average 87%
West Gascoyne (district 06)
Carnarvon Airport 29.7 +0.3 37.5 14th 20.7 0.0 17.4 6th 0 5.4 lowest 0%
Denham 28.6 -0.6 39.5 15th 19.3 -1.2 14.0 29th 0 2.3 lowest 0%
Emu Creek Station 40.5 +0.6 44.8 19th 23.1 +0.7 17.7 4th 41.2 13.2 v high 312%
Murchison 37.4 0.0 42.9 21st 20.2 0.0 14.6 28th 0.8 13.4 low 6%
Shark Bay Airport 31.7 -0.6 41.2 10th 19.0 -0.7 16.1 6th 0 9.9 v low 0%
East Gascoyne (district 07)
Newman Aero 39.7 +0.7 43.2 19th 24.3 +0.4 18.2 29th 21.6 37.0 average 58%
Paraburdoo Aero 40.6 +0.2 44.4 19th 24.7 +0.2 18.4 6th 23.0 27.5 average 84%
Murchison (district 07A)
Meekatharra Airport 38.1 +1.6 43.3 24th 22.5 +0.4 16.6 28th 6.4 14.8 average 43%
Mount Magnet Aero 36.6 +0.9 43.5 11th 21.0 -0.1 14.5 28th 6.6 21.2 average 31%
Paynes Find 35.4 +0.4 42.2 11th 18.9 +0.5 13.1 28th 15.4 12.7 average 121%
North Coast (district 08)
Dalwallinu 32.6 -0.5 41.7 21st 14.7 -1.1 10.4 29th 1.2 13.6 low 9%
Geraldton Airport 29.5   39.8 20th 15.4   11.0 6th 0.6
Kalbarri 30.9 -0.3 39.6 20th 17.0 -0.5 12.5 28th 2.0 3.7 high 54%
Morawa Airport 34.9 -0.3 43.4 21st 16.2 -1.3 12.1 29th 2.6 16.0 low 16%
Mullewa 34.8 +0.4 42.4 21st 17.1 +0.1 12.2 5th 2.8 8.4 average 33%
North Island 26.2 -0.4 30.7 15th 19.5 -0.5 17.8 3rd 1.2 3.5 average 34%
Wongan Hills 31.8 -0.7 41.5 21st 14.1 -1.7 10.0 5th 5.8 10.0 average 58%
Central Coast (district 09)
Badgingarra Research Stn 31.5 -0.5 42.6 21st 14.4 -0.6 9.9 28th 0 9.1 lowest 0%
Bickley 27.4 -0.7 39.7 21st 12.7 -1.0 9.1 28th 19.0 13.9 average 137%
Garden Island HSF 24.6 -0.9 40.9 21st 16.6 -0.6 13.5 8th 6.2 10.7 average 58%
Gingin Aero 29.8 -0.8 43.1 21st 13.4 -1.0 8.1 6th 7.4 9.7 average 76%
Gosnells City 29.1 -1.3 42.4 21st 15.6 -0.7 10.6 28th 10.7 11.4 average 94%
Jandakot Aero 28.5 -0.6 43.3 21st 14.2 -0.5 8.6 29th 6.6 10.6 average 62%
Jurien Bay 27.9 -0.3 38.9 21st 15.4 -0.2 11.7 6th 0.6 6.5 low 9%
Karnet 27.1 -1.1 38.6 21st 12.9 -0.6 9.6 29th 37.2 18.6 high 200%
Lancelin 25.8 -1.6 41.0 21st     11.6 29th 5.0 7.9 average 63%
Pearce RAAF 30.8 +0.5 42.9 21st 13.5 -1.0 8.5 28th 13.8 10.8 high 128%
Perth Airport 29.3 +0.3 42.8 21st 14.7 -0.2 8.9 28th 7.4 11.2 average 66%
Perth Metro 28.4 -0.7 42.4 21st 15.7 -0.7 11.8 29th 10.2 9.7 average 105%
Rottnest Island 24.5 -0.5 39.8 21st 16.9 -0.7 14.2 8th 2.4 10.3 average 23%
Swanbourne 26.4 -1.6 42.0 21st 15.8 -0.7 11.6 29th 6.0 11.8 average 51%
South Coast (district 09A)
Albany 20.8 -1.0 25.1 26th 14.2 +0.2 11.2 6th 34.1 30.2 high 113%
Albany Airport 23.1   32.8 21st 11.5   6.9 6th 47.8
Bridgetown 26.5 -0.9 39.0 10th 10.3 -0.7 3.4 8th 27.6 18.3 high 151%
Bunbury 26.7 -0.6 38.5 21st 12.4 -1.1 6.3 4th 6.2 18.2 average 34%
Busselton Aero 27.0 -0.9 37.1 21st 11.3 -1.1 5.6 6th 9.8 9.1 high 108%
Cape Leeuwin 21.7 -0.1 26.3 21st 15.4 -0.4 11.7 2nd 25.0 20.6 high 121%
Cape Naturaliste 24.2 +0.6 35.3 21st 13.3 -0.6 9.7 2nd 6.2 13.5 average 46%
Collie East 27.7 -0.8 38.7 10th 10.5 -1.0 5.1 8th 27.2 22.0 high 124%
Dwellingup 27.8 +0.5 38.6 21st 12.3 -0.3 7.5 29th 35.8 20.7 high 173%
Esperance 23.7 -0.9 39.6 11th 14.1 -0.3 8.7 9th 22.2 19.7 average 113%
Esperance Aero 26.2 +0.4 41.6 11th 12.9 -0.5 8.9 6th 35.2 21.5 high 164%
Hopetoun North 23.8 -0.2 35.8 22nd 13.7 0.0 7.0 9th 20.4 26.2 average 78%
Jarrahwood 26.9 -0.2 38.0 10th 10.4 -0.8 4.0 8th 17.4 16.6 average 105%
Mandurah 26.3 -0.7 39.5 21st 16.3 -0.9 12.8 8th 5.4 16.4 average 33%
Manjimup 25.2 +0.3 38.1 10th 10.9 -0.8 7.2 2nd 44.0 25.3 high 174%
North Walpole 22.4 0.0 34.0 21st 12.0 -0.9 7.6 5th 52.8 42.8 average 123%
Rocky Gully 24.4 -1.1 38.3 10th 10.1 -0.9 5.6 8th 30.0 30.8 average 97%
Shannon 23.4 -0.9 36.6 10th 10.9 -0.3 6.7 8th 49.0 29.4 high 167%
Witchcliffe 24.2 -0.6 36.7 21st 11.9 -0.5 6.3 2nd 25.8 14.8 high 174%
North Central (district 10)
Bencubbin 32.0 -0.4 41.0 24th 15.5 -0.5 11.3 8th 11.4 13.3 average 86%
Cunderdin Airfield 32.6 -0.2 43.7 10th 13.8 -1.1 9.1 7th 13.6 8.5 average 160%
Merredin 32.4 +0.4 41.6 10th 15.3 -0.5 10.5 8th 34.4 14.2 high 242%
Northam 31.7 -0.4 42.1 10th 14.5 -0.8 10.5 29th 13.8 9.3 high 148%
York 31.9 -0.3 42.5 10th 12.8 -1.2 9.0 30th 20.6 13.1 high 157%
South Central (district 10A)
Beverley 31.3 -0.9 42.0 10th 13.4 -1.0 8.8 29th 32.6 10.5 v high 310%
Brookton 30.5 -0.5 41.0 10th 12.9 -0.6 7.3 29th 34.6 10.6 v high 326%
Corrigin 30.0 -0.5 41.1 11th 12.9 -1.1 8.7 29th 21.6 13.1 high 165%
Hyden 32.3 +0.5 41.6 10th 13.2 -0.7 7.9 8th 16.2 14.8 high 109%
Jacup 26.2 0.0 38.0 11th 11.3 -0.2 6.9 30th 57.8 30.3 high 191%
Katanning 27.5 -1.0 39.6 10th 10.8 -0.9 5.8 8th 55.4 27.1 high 204%
Lake Grace 28.8 -0.5 40.0 10th 12.8 -0.7 7.6 8th 47.2 23.6 high 200%
Narembeen 31.5 -0.5 40.5 10th 14.0 -0.5 8.6 8th 30.2 12.9 high 234%
Narrogin 28.6 -0.3 40.0 10th 12.4 0.0 8.1 8th 21.8 14.2 high 154%
Newdegate Research Station 29.6 +0.2 39.5 10th 10.7 -1.0 4.3 8th 38.2 15.8 high 242%
Ongerup 26.6 -0.6 38.0 10th 12.1 -0.3 7.2 4th 42.6 17.7 v high 241%
Pingelly 30.1 +0.1 40.4 10th 12.8 -1.1 7.8 29th 1.8 12.5 average 14%
Ravensthorpe 26.6 -0.6 36.6 10th 12.2 -0.6 6.6 30th 25.0 24.2 average 103%
Wagin 28.7 -0.6 41.0 10th 12.1 -0.9 7.5 8th 43.4 13.4 v high 324%
Wandering 29.4 -0.9 40.3 10th 11.2 -0.8 5.2 29th 25.8 19.5 high 132%
Eucla (district 11)
Balladonia 29.7 -0.5 41.1 24th 13.1 -0.2 7.0 15th 7.6 18.9 average 40%
Eucla 27.5 +2.7 42.3 12th 15.9 +0.8 9.6 16th 55.0 18.7 v high 294%
Eyre 28.1 +2.6 39.5 3rd 14.2 +0.1 5.0 9th 48.7 20.8 high 234%
Forrest 32.0 +0.5 42.7 23rd 15.8 +0.9 10.3 9th 43.0 25.5 high 169%
Red Rocks Point 26.1 +1.6 43.4 12th 16.6 +0.2 12.0 16th 20.8 19.8 average 105%
South East (district 12)
Bulga Downs 36.8 +0.8 44.1 11th 20.1 0.0 13.8 28th 2.2 13.3 average 17%
Kalgoorlie-Boulder Airport 31.6 -0.4 40.7 11th 16.3 -0.3 11.0 29th 55.0 16.7 v high 329%
Laverton Aero 35.4 +1.7 42.3 3rd 20.2 +0.5 12.7 14th 10.0 28.3 low 35%
Leinster Aero 36.5 +1.1 42.5 11th 21.6 +0.5 14.8 14th 27.4 27.4 average 100%
Leonora Aero 35.9   43.1 11th 20.6   13.4 14th 17.2 15.6 average 110%
Munglinup West 27.2 -0.2 39.2 11th 12.3 -0.3 8.2 30th 31.2 31.1 average 100%
Norseman Aero 30.5 -0.5 41.4 11th 13.5 -0.4 6.4 8th 16.4 22.2 average 74%
Salmon Gums Res.Stn. 28.8 -0.2 40.1 24th 11.8 -0.4 2.5 2nd 17.2 20.0 average 86%
Southern Cross Airfield 32.2 -0.6 41.5 11th 15.4 -0.1 9.1 29th 19.4 15.6 high 124%
Yeelirrie 37.8 +1.6 42.0 11th 21.1 +1.2 13.4 28th 3.6 19.9 average 18%
North East (district 13)
Carnegie 38.7 +1.2 43.5 19th 22.9 +0.8 12.4 30th 11.0 23.6 average 47%
Giles Meteorological Office 34.4 -1.4 40.7 1st 21.4 -0.5 15.7 15th 111.6 46.9 v high 238%
Telfer Aero 39.7 -0.6 44.4 18th 26.4 +0.9 22.5 15th 25.8 46.2 average 56%
Warburton Airfield 35.6 -1.1 41.8 2nd 21.6 +0.2 15.1 14th 81.6 32.3 v high 253%
Wiluna 38.1 +1.2 42.0 18th 22.9 +1.8 17.0 14th 35.4 22.3 high 159%
Offshore Islands (district 200)
Adele Island 31.7   35.0 9th 26.0   22.7 4th
Browse Island 31.1   34.5 7th 27.0   23.1 19th
Christmas Island Aero 28.1 +0.3 29.8 12th 23.0 +0.4 20.4 29th 241.0 222.1 average 109%
Cocos Island Airport 29.3 -0.1 30.2 21st 24.7 +0.1 22.8 26th 69.8 118.3 average 59%
Rowley Shoals 30.0   31.5 14th     23.9 22nd
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.

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 4 pm on Tuesday 3 January 2017. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

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.

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