Western Australia in December 2013: a warm and wet month

  • Rainfall: above average for WA
  • Maximum temperature: above average for WA
  • Minimum temperature: above average for WA
  • Rainfall

    December 2013 rainfall was above to very much above average rainfall over a broad area extending from the Pilbara and west Kimberley coast to eastern Southeast Coastal and western Eucla, as well as scattering areas in the north and east Kimberley, mostly due to a weak low in the Timor Sea followed by Tropical Cyclone Christine towards the end of month. Some sites in the Pilbara received their highest daily rainfall in December on record on the 31st, and Karratha Aerodrome also registered its wettest December month in 41 years of rainfall record as the result. Conversely, below to very much below average were observed in scattered areas of the Gascoyne,  Goldfields, and Southwest Land Division (SWLD).

    Averaged across WA as a whole, rainfall in December 2013 was above average,though it was near average rainfall for the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) and the Southwest Land Division (SWLD).

    Seasonal shower and thunderstorm activity was frequent during December in the Kimberley and Pilbara, with some moderate to heavy rainfall reported. Falls were particularly heavy from the 23rd as a low in the Timor Sea moved toward the north Kimberley. Severe Tropical cyclone Christine made landfall on the Pilbara coast between Whim Creek and Roebourne on the 30th and brought some very heavy falls, and Abydos North (southeast of Port Hedland) received a daily rainfall total of 168.6 mm on the 31st, the highest daily rainfall in WA of the month.

    A trough developed near the west coast on the 5th and moved slowly eastward across southern WA over the following few days triggering isolated showers and thunderstorms in the Gascoyne, SWLD, Goldfields, Southern Interior, and Eucla, with some moderate falls from the 6th to 9th before another West Coast Trough produced thunderstorms with moderate rainfall in the Gascoyne, Central West, northern Goldfields, and Southern Interior on the 10th and 11th. Moderate falls were reported in WA south coast districts on the 19th and 20th as a cloudband moved across the region.

    Maximum temperature

    Above to very much above average mean maximum temperatures were observed in the western and southern WA, with up to 4 °C above warmer than normal in the western Eucla. In contrast, above to very much above average mean maximum temperatures were recorded over a band covering the west and inland east Kimberley, Northern Interior and east Pilbara, with up to 3 °C cooler than normal in the east Kimberley.

    Averaged across the state as a whole, the mean maximum temperature for WA in December 2013 was above average. For the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay), the mean maximum temperature in December 2013 was also above average.

    Cool to cold days were observed in parts of the SWLD from the 1st to 4th, and from the 7th to 9th, with the 7th being the coldest day for the month for most sites and a daily maximum of 17.1 °C at Pemberton (Southwest) was the lowest maximum temperature of December 2013 in WA. Toward the middle of the month, a strong high moved slowly through the Bight bringing prolonged hot conditions to southern WA. A hot spell with daily maximum temperatures above 35 °C started in western parts of the SWLD on the 12th and intensified and gradually shifted south and east and ended in the Eucla district on the 18th. Temperatures above 44 °C were reported in the Central West, Central Wheat Belt, Goldfields, Southeast Coastal, and Eucla during the heat event with sites in the Central West and Southeast Coastal recording their highest December temperature on record. Red Rocks Point in the Eucla district recorded a maximum temperature of 46.0 °C on the 18th, which is the highest temperature at Red Rocks Point in December in 11 years of record. An inland trough directed very hot northely winds over the southeastern WA on the 27th. Eucla (town) recorded a daily maximum temperature of 47.4 °C, which is its hottest December day in 52 years of record, and the highest temperature of the month in WA.

    Minimum temperatures

    Above to very much above average mean minimum temperature were observed in a broad area from the northwest, through central, down to Southeast WA. Below to very much below average mean minimum temperatures were confined in small areas of west and south Kimberley.

    Averaged across the state as a whole, the mean minimum temperature for WA in December 2013 was above average. Averaged across the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay), the mean minimum temperature was near average.

    In the SWLD, December 2013 started with cool to cold nights from the 1st to 5th, from the 8th to 11th, and from the 21st to 23rd. A minimum of 3.0 °C was recorded at Salmon Gums Research Station on the 10th, which was the lowest temperature of the month in WA. Warm nights were mainly observed in the SWLD on the 6th, and from the 14th to 18th. Very warm nights with daily minima over 30 °C were experienced in the inland east Pilbara and Northern and Southern Interior on the 3rd, and contracting to the inland east Pilbara and western Northern Interior on the 4th. Telfer Aerodrome in the Pilbara recorded the highest minimum temperature of the month in WA on the 4th with 32.0 °C. Parts of the central WA also saw very warm nights at the last two days of December. Wiluna in the northern Goldfields recorded a minimum of 31.0 °C on the 30th, which is the highest overnight temperature at Wiluna in 52 years of record, exceeding its previous record of 30.5 °C set on 19 December 2005.

    Other Phenomena

    Thunderstorms that developed over the inland eastern Pilbara on the 21st produced damage at the Jigalong Community, approximately 165km east of Newman. Overhead powerlines and some minor structural damage was reported; some roads were also made impassable in the wake of the storms. Thunderstorms produced a wind gust of 91 km/h at 1232 WST at Coondewanna, northwest of Newman.

    A tropical low off the northwest coast became Tropical Cyclone Christine in the evening of the 28th and made landfall as a category 3 cyclone at the Pilbara coast between Whim Creek and Roebourne on the 30th. TC Christine brought very heavy falls, and destructive winds to the Pilbara region. Roebourne Airport recorded a wind gust of 172 km/h on the 30th. A power station be in the Roebourne and Whim Creek area was destroyed and caused a lengthy power outrage.

Further information

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Extremes in December 2013
Hottest day 47.4 °C at Eucla on the 27th
Warmest days on average 41.0 °C at Emu Creek Station
Coolest days on average 21.2 °C at Albany
Coldest day 17.1 °C at Pemberton on the 7th
Coldest night 3.0 °C at Salmon Gums Res.Stn. on the 10th
Coolest nights on average 10.3 °C at Rocky Gully
Warmest nights on average 27.7 °C at Troughton Island
26.6 °C at Wyndham
Warmest night 32.0 °C at Telfer Aero on the 4th
Wettest overall 401.0 mm at Lombadina Airstrip
Wettest day 168.6 mm at Abydos North on the 31st
Highest wind gust 172 km/h at Roebourne Aero on the 30th

Maps

Maps

Observed Anomaly Decile 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

Record highest December daily rainfall
Highest daily rainfall
in December 2013 (mm)
Previous wettest
for December
Years of
record
Roebourne 166.0 on the 31st 97.3 on the 31st in 1945 114
Karratha Station 104.0 on the 31st 63.5 on the 31st in 1945 109
Millstream 102.6 on the 31st 99.3 on the 30th in 1936 105
De Grey 161.0 on the 31st 132.3 on the 30th in 1947 81
Karratha Aero 112.8 on the 31st 88.0 on the 15th in 1999 41
Mooloo Downs 18.0 on the 12th 10.0 on the 11th in 2007 30



Record highest total December rainfall
Total rainfall
for December 2013 (mm)
Previous wettest
for December
Years of
record
Average for
December
Karratha Aero 112.8 97.0 in 1988 41 14.9

Highest total December rainfall for at least 30 years
Total rainfall
for December 2013 (mm)
Most recent December
at least this wet
Years since
wetter
Average for
December
Cape Leveque 388.1 416.4 in 1930* 74 85.2
Karratha Station 104.0 123.5 in 1973* 38 9.9
Port Hedland Airport 143.8 219.0 in 1975 38 19.6
Country Downs 293.0 398.3 in 1970* 37 118.5

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




Record lowest total December rainfall
Total rainfall
for December 2013 (mm)
Previous driest
for December
Years of
record
Average for
December
Greenbushes 0.0 0.3 in 1909 119 19.5



Record highest December temperature
Highest temperature
in December 2013 (°C)
Previous warmest
for December
Years of
record
Average for
December
Carnamah 45.3 on the 16th 45.2 on the 29th in 2009 72 33.5
Eucla 47.4 on the 27th 45.4 on the 15th in 2009 52 24.8
Ravensthorpe 43.3 on the 17th 43.0 on the 23rd in 1997 52 27.2
Esperance 45.3 on the 17th 44.9 on the 29th in 2009 45 24.6



Record highest December mean daily maximum temperature
Mean daily maximum
temperature
for December 2013 (°C)
Previous warmest
for December
Years of
record
Average for
December
Eyre 29.7 = 29.7 in 2005 54 25.3

Highest December mean daily maximum temperature for at least 30 years
Mean daily maximum
temperature
for December 2013 (°C)
Most recent December
at least this warm
Years since
warmer
Average for
December
Carnarvon Airport 31.9 32.0 in 1975 38 29.3



Record highest December daily minimum temperature
Highest daily minimum
temperature
in December 2013 (°C)
Previous warmest
for December
Years of
record
Average for
December
Wiluna 31.0 on the 30th 30.5 on the 19th in 2005 55 21.1



Highest December mean daily minimum temperature for at least 30 years
Mean daily minimum
temperature
for December 2013 (°C)
Most recent December
at least this warm
Years since
warmer
Average for
December
Esperance 15.5 15.7 in 1982 31 14.4



Summary statistics for December 2013
Maximum temperatures
for December
(°C)
Minimum temperatures
for December
(°C)
Rainfall
for December
(millimetres)
Mean for
December
2013
Diff
from
average
Highest for
December
2013
Mean for
December
2013
Diff
from
average
Lowest for
December
2013
Total for
December
2013
Average
for
December
Rank of
December
2013
Fraction of
December
average
North Kimberley (district 01)
Doongan 33.4 -1.1 37.3 2nd 23.1 0.0 22.0 6th 238.9 223.3 average 107%
Kalumburu 35.7 +0.4 39.4 11th 24.7 -0.2 23.6 17th 228.8 235.4 average 97%
Mount Elizabeth         22.6 +0.3 21.0 15th 146.3 166.3 average 88%
Troughton Island 32.7 -0.3 34.3 14th 27.7 +0.4 24.9 23rd 135.4 119.1 high 114%
Wyndham 36.9 -1.2 41.0 18th 26.6 -0.4 23.4 23rd 384.4 156.1 v high 246%
Wyndham Aero 36.9 -1.1 41.3 18th 26.4 -0.3 23.2 23rd 382.4 138.4 v high 276%
East Kimberley (district 02)
Argyle Aerodrome 36.9 -0.3 41.5 16th 25.9 +0.1 22.1 24th 173.4 138.3 high 125%
Halls Creek Airport 35.8 -2.0 40.7 2nd 24.2 -0.5 21.1 31st 100.8 82.4 average 122%
Kununurra Aero 37.3 +0.2 41.7 11th 25.0 -0.4 21.2 17th 168.2 136.7 high 123%
Warmun 36.5 -1.9 41.4 16th 25.4 +0.3 22.5 5th 195.6 116.0 high 169%
West Kimberley (district 03)
Bidyadanga 35.7 +0.7 40.0 27th 26.1 +0.4 22.5 16th 137.6 55.6 high 247%
Broome Airport 34.3 +0.4 39.4 11th 26.4 -0.1 23.2 29th 205.4 57.7 v high 356%
Curtin Aero 37.0 -1.4 42.1 3rd 24.7 -0.3 21.4 19th 136.2 148.3 average 92%
Derby Aero 36.7 -0.5 40.9 10th 25.9 -0.4 23.0 13th 163.2 71.6 high 228%
Fitzroy Crossing Aero 38.3 -0.8 43.4 2nd 25.6 -0.1 21.8 5th 138.2 123.5 high 112%
Lombadina Airstrip 33.5   38.0 11th 25.2   22.0 12th 401.0
West Roebuck 35.8 -0.2 40.8 11th 25.1 -0.2 22.7 29th 218.4 108.9 high 201%
De Grey (district 04)
Bedout Island 33.2   37.3 28th 26.6   24.3 30th
Karratha Aero 36.4 +0.6 44.0 20th 25.9 +0.4 22.4 3rd 112.8 14.9 highest 757%
Legendre Island 33.1   38.6 28th 25.7   22.7 2nd
Mandora 36.8 0.0 43.1 27th 24.9 +0.5 22.2 2nd        
Marble Bar 40.8 -0.8 44.7 4th 25.7 -0.4 21.6 2nd 122.8 37.3 v high 329%
Pardoo Station 36.6 +0.2 43.1 28th 25.0 +0.2 20.2 1st 110.9 24.4 v high 455%
Port Hedland Airport 36.3 -0.3 41.5 26th 24.8 +0.8 20.4 2nd 143.8 19.6 v high 734%
Roebourne 39.4 +0.4 45.4 21st 25.2 +0.3 20.1 2nd 170.6 12.3 v high 1387%
Roebourne Aero 39.2 0.0 45.6 21st 24.9 +0.2 18.1 2nd 138.0 16.8 v high 821%
Shay Gap 40.1   43.7 13th 25.7   22.2 15th 168.8
Fortescue (district 05)
Barimunya 36.8   41.3 28th 23.7   19.5 11th 112.2
Barrow Island Airport 33.0 +0.8 38.7 14th 24.8 +0.3 21.0 3rd 7.6 6.7 high 113%
Christmas Creek 38.7   42.5 28th 25.0   20.7 11th 49.4
Coondewanna 36.3   41.9 28th 22.2   16.3 22nd 120.0
Learmonth Airport 37.6 +0.8 45.2 29th 22.3 +1.5 16.7 1st 2.2 6.5 high 34%
Mardie 37.0 -0.6 44.1 14th 24.5 +1.5 18.4 1st 47.8 9.0 v high 531%
Onslow Airport 35.8 -0.1 44.5 27th 24.5 +2.3 20.3 1st 0.4 3.5 average 11%
Wittenoom 39.0 -0.6 43.3 28th 24.5 -0.9 20.7 11th 110.2 50.6 high 218%
West Gascoyne (district 06)
Carnarvon Airport 31.9 +2.6 39.7 23rd 22.2 +1.6 18.2 1st 0.4 5.6 average 7%
Denham 30.8 +1.7 38.0 23rd 21.2 +0.7 16.2 6th 0 2.4 lowest 0%
Emu Creek Station 41.0 +1.2 46.2 28th 24.2 +1.8 17.9 1st 6.5 13.2 average 49%
Murchison 38.6 +1.3 45.5 29th         12.4 14.3 average 87%
Shark Bay Airport 33.9 +1.7 42.4 14th 20.6 +1.0 16.9 1st 0.2 12.0 average 2%
East Gascoyne (district 07)
Newman Aero 37.4 -1.5 43.0 3rd 24.0 +0.2 19.0 11th 72.6 38.8 v high 187%
Paraburdoo Aero 39.9 -0.3 44.5 28th 25.3 +0.9 20.4 1st 41.8 29.0 high 144%
Murchison (district 07A)
Meekatharra Airport 36.5 +0.1 43.3 29th 22.8 +0.8 17.0 11th 65.8 15.2 v high 433%
Mount Magnet Aero 36.8 +1.3 44.6 29th 21.7 +0.6 16.0 1st 9.8 23.8 average 41%
Paynes Find 36.3 +1.4 44.7 29th 19.8 +1.5 13.2 1st 2.4 12.9 average 19%
North Coast (district 08)
Carnamah 36.0 +2.5 45.3 16th 17.3 +1.2 12.0 1st 1.4 9.1 average 15%
Dalwallinu 34.3 +1.2 43.5 16th 16.2 +0.4 10.7 3rd 0 15.1 v low 0%
Geraldton Airport 31.9   42.7 13th 16.9   11.7 4th 2.6
Kalbarri 32.9 +1.8 40.5 5th 18.8 +1.4 10.0 4th 0 3.9 lowest 0%
Mullewa 36.1 +1.7 43.1 16th 18.5 +1.5 12.1 3rd 15.2 8.5 high 179%
North Island 27.6 +1.2 33.2 13th                
Wongan Hills 34.2 +1.8 43.0 15th 16.2 +0.4 10.5 3rd 0 10.1 lowest 0%
Central Coast (district 09)
Badgingarra Research Stn 33.6 +1.6 42.7 16th 15.5 +0.5 7.5 1st 0.6 9.6 low 6%
Bickley 29.3 +1.3 38.6 14th 14.5 +0.9 9.1 4th 0.8 13.4 low 6%
Champion Lakes 30.2   38.5 14th 17.1   12.8 4th 0.2
Garden Island HSF 25.5 -0.1 31.9 5th 17.6 +0.4 13.9 4th 2.6 12.4 low 21%
Gingin Aero 31.9 +1.3 42.0 14th 14.4 0.0 8.1 2nd 0.4 10.3 v low 4%
Gosnells City 31.9 +1.5 41.2 14th 17.2 +1.0 13.0 2nd 2.4 11.6 low 21%
Jandakot Aero 30.2 +1.2 39.1 14th 14.9 +0.2 9.5 23rd 2.0 10.7 average 19%
Jurien Bay 29.5 +1.3 37.0 12th 14.9 -0.7 11.0 4th 9.0 7.2 average 125%
Karnet 28.8 +0.6 38.0 14th 14.3 +0.8 8.8 3rd 3.2 18.1 low 18%
Lancelin 28.9 +1.6 36.5 12th 15.6 -0.6 10.5 4th 0 8.2 lowest 0%
Pearce RAAF 32.8 +2.6 42.6 15th 14.8 +0.3 9.3 23rd 0.6 10.6 low 6%
Perth Airport 31.1 +2.2 40.3 14th 15.5 +0.6 9.9 23rd 1.0 11.3 low 9%
Perth Metro 30.5 +1.5 40.4 14th 16.7 +0.3 13.2 4th 1.8 13.3 low 14%
Rottnest Island 25.6 +0.6 31.0 5th 18.1 +0.5 14.0 4th 1.2 8.2 low 15%
Swanbourne 29.1 +1.2 36.6 13th 17.0 +0.5 12.4 4th 0.2 12.3 low 2%
South Coast (district 09A)
Albany 21.2 -0.7 26.3 24th 14.9 +0.9 11.6 3rd 51.1 30.1 high 170%
Albany Airport 23.4   31.5 6th 12.3   6.4 28th 41.0
Bridgetown 28.2 +0.8 38.6 14th 10.4 -0.7 5.4 28th 0.4 19.3 v low 2%
Bunbury 27.9 +0.6 36.8 15th 13.3 -0.3 6.9 8th 1.6 20.7 average 8%
Busselton Aero 28.5 +0.5 37.1 14th 11.9 -0.6 7.3 28th 0.4 9.8 v low 4%
Cape Leeuwin 22.2 +0.4 24.9 14th 16.3 +0.5 14.0 5th 5.8 20.8 low 28%
Cape Naturaliste 25.6 +2.0 33.2 16th 14.1 +0.2 10.0 9th 4.0 13.8 average 29%
Collie East 29.4 +1.0 38.8 14th 10.7 -1.0 5.0 8th 0.6 24.8 v low 2%
Donnybrook 29.9 +1.7 39.2 14th 13.6 +1.2 8.0 9th 1.4 16.5 v low 8%
Dwellingup 29.3 +2.1 38.7 14th 13.0 +0.4 9.4 2nd 3.2 20.6 low 16%
Esperance 26.3 +1.7 45.3 17th 15.5 +1.1 12.5 6th 30.2 19.1 high 158%
Esperance Aero 28.1 +2.5 45.6 17th 13.8 +0.4 9.5 10th 34.4 20.7 high 166%
Harvey 29.4 +0.9 37.5 14th 13.1 -0.4 8.0 8th 1.0 17.8 v low 6%
Hopetoun North 23.7 -0.4 42.1 15th 12.8 -1.1 7.5 23rd 7.4 24.3 low 30%
Jarrahwood 28.7 +1.7 38.6 14th 10.7 -0.5 4.4 28th 1.6 17.1 low 9%
Mandurah 28.0 +1.1 35.9 15th 17.7 +0.5 13.7 9th 0.8 19.4 v low 4%
Manjimup 26.7 +1.8 38.4 14th 11.6 -0.1 7.5 28th 3.8 25.3 v low 15%
North Walpole 22.8   28.5 13th 12.8   8.7 22nd 24.0 42.7 average 56%
Pemberton 25.7 +1.8 36.2 14th 12.2 +0.3 8.9 11th 15.6 34.4 low 45%
Rocky Gully 26.8 +1.3 39.3 14th 10.3 -0.9 4.9 28th 34.6 32.0 average 108%
Windy Harbour 21.7 -0.2 25.6 14th 12.7 -0.4 7.4 28th 17.3 28.3 average 61%
Witchcliffe 25.8 +1.0 35.1 14th 11.9 -0.5 7.6 21st 4.6 15.0 low 31%
North Central (district 10)
Bencubbin 34.2 +1.8 44.6 15th 17.2 +1.2 11.6 4th 0 13.4 lowest 0%
Cunderdin Airfield 34.3 +1.6 44.0 15th 14.5 -0.4 8.2 23rd 4.0 8.8 average 45%
Kellerberrin 34.2 +2.2 44.5 15th 14.0 -1.0 10.0 21st 0 13.4 lowest 0%
Merredin 34.5 +2.5 43.0 16th 16.5 +0.7 10.3 1st 2.0 14.2 low 14%
Northam 33.6 +1.5 44.7 15th 15.3 0.0 10.7 4th 3.2 9.3 average 34%
York 33.9 +1.8 44.8 15th 13.1 -1.0 7.2 23rd 2.8 12.0 low 23%
South Central (district 10A)
Beverley 34.2 +2.1 44.4 16th 13.9 -0.5 8.4 23rd 3.2 10.3 average 31%
Brookton 32.5 +1.5 43.3 16th 13.9 +0.4 8.5 4th 5.2 10.3 average 50%
Corrigin 32.3 +1.9 43.7 16th 14.1 +0.1 9.0 3rd 17.6 13.1 high 134%
Hyden 33.3 +1.5 43.5 15th 14.1 +0.2 9.5 5th 11.2 15.0 average 75%
Jacup 28.5 +2.5 43.8 15th 11.1 -0.4 5.6 11th 6.2 26.6 low 23%
Katanning 29.8 +1.3 42.4 15th 11.3 -0.5 6.7 9th 2.0 26.2 low 8%
Lake Grace 30.8 +1.5 42.5 15th 13.3 -0.3 8.4 11th 2.4 19.3 low 12%
Narembeen 33.4 +1.5 42.8 15th 15.1 +0.6 10.4 4th 6.6 13.0 average 51%
Narrogin 30.7 +1.8 41.4 15th 12.9 +0.6 8.2 10th 5.2 14.2 average 37%
Newdegate Research Station 31.1 +1.9 42.6 16th 10.7 -1.1 3.8 22nd 13.2 15.2 average 87%
Ongerup 28.5 +1.4 41.9 15th 12.0 -0.4 7.4 9th 4.2 17.3 low 24%
Pingelly 31.5 +1.6 42.6 16th 14.0 +0.1 8.6 4th 8.8 12.6 average 70%
Ravensthorpe 28.3 +1.1 43.3 17th 12.9 +0.1 8.0 22nd 33.2 23.6 high 141%
Wagin 30.9 +1.7 42.4 15th 12.7 -0.3 8.0 8th 1.4 13.1 low 11%
Wandering 31.4 +1.2 41.7 15th 11.5 -0.5 5.4 21st 2.8 18.5 low 15%
Eucla (district 11)
Balladonia 30.2 0.0 43.6 17th 14.1 +0.8 8.5 10th 46.8 18.7 v high 250%
Eucla 28.8 +4.0 47.4 27th 15.6 +0.6 10.7 6th 7.8 18.4 average 42%
Eyre 29.7 +4.4 45.5 31st 13.3 -0.8 4.2 29th 28.7 20.4 high 141%
Forrest 33.1 +1.8 46.5 27th 14.7 -0.2 8.3 10th 26.4 26.4 average 100%
Red Rocks Point 27.4 +3.3 46.6 31st 16.4 0.0 11.4 24th 29.2 21.4 average 136%
South East (district 12)
Bulga Downs 36.3 +0.5 45.4 26th 19.9 -0.2 15.0 6th 13.6 13.6 average 100%
Kalgoorlie-Boulder Airport 32.8 +0.8 42.9 30th 17.6 +1.0 10.5 4th 7.4 16.2 average 46%
Laverton Aero 35.5 +2.1 44.0 27th 20.4 +0.8 11.8 11th 53.6 29.7 high 180%
Leinster Aero 36.3 +1.2 44.3 26th 21.8 +0.7 13.8 11th 6.0 27.4 low 22%
Leonora 36.4 +1.1 45.8 26th 20.7 +0.7 13.2 11th 8.2 16.8 average 49%
Leonora Aero 35.9   44.9 26th 21.3   14.5 11th 5.8
Munglinup West 28.5 +1.1 45.2 17th 12.9 +0.2 8.5 10th 38.2 26.9 average 142%
Norseman Aero 31.8 +0.9 43.6 17th 14.8 +0.9 5.9 5th 9.0 23.6 average 38%
Salmon Gums Res.Stn. 31.5 +2.6 45.1 17th 12.1 -0.1 3.0 10th 17.4 20.0 average 87%
Southern Cross Airfield 34.4 +1.7 45.7 30th 16.9 +1.6 10.3 4th 0.2 16.6 v low 1%
Yeelirrie 36.8 +0.7 44.0 29th 20.7 +0.8 13.7 11th 24.3 20.4 high 119%
North East (district 13)
Balgo Hills                 52.0 57.0 average 91%
Carnegie 37.3 0.0 44.0 29th 22.6 +0.6 15.5 11th 34.6 24.0 high 144%
Giles Meteorological Office 35.8 +0.1 41.6 28th 22.0 +0.1 15.6 23rd 42.0 45.1 average 93%
Telfer Aero 39.0 -1.2 44.0 3rd 25.7 +0.3 20.2 11th 84.4 47.9 high 176%
Warburton Airfield 37.4 +0.8 44.9 29th 22.4 +1.1 15.7 23rd 24.0 31.3 average 77%
Wiluna 37.0 +0.2 43.5 29th 22.5 +1.4 15.5 11th 37.5 22.5 high 167%
Offshore Islands (district 200)
Adele Island 31.2   33.9 11th 26.8   22.6 25th
Browse Island 31.0   33.2 19th 27.0   22.9 31st
Christmas Island Aero 28.2 +0.5 29.6 28th 22.8 +0.2 19.8 1st 432.6 220.9 high 196%
Cocos Island Airport 29.6 +0.2 30.7 13th 25.0 +0.4 22.5 24th 273.4 117.0 v high 234%
Varanus Island 31.4 +0.1 35.5 27th 25.2 +0.4 22.9 1st 15.6 3.4 high 459%

Notes

A Monthly Climate Summary is prepared to list 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. Later information, including data that has had greater opportunity for quality control, will be presented in the Monthly Weather Review, usually published in the fourth week of the month.

This statement has been prepared based on information available at 8 am on Thursday 2 January 2014. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

Averages 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.

The ACORN-SAT dataset is being used for temperature area averages from December 2012 onwards. The major change from earlier datasets is that the ACORN-SAT dataset commences in 1910, rather than 1950, and hence rankings are calculated using a larger set of years.

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