Western Australia in January 2013: A hot month for WA

  • Rainfall: near average for WA; above average for southwest WA
  • Maximum temperature: eleventh-highest on record
  • Minimum temperature: third-highest on record

Rainfall

Rainfall during January 2013 was above- to very-much-above-average through much of western and central WA, but particularly in central and western parts of the Pilbara as a result of local thunderstorm activity as well as the passage of tropical cyclone Peta through the region bringing some record daily falls. Western parts of the Gascoyne also saw above average rainfall due to local thunderstorm activity, as did northern parts of the Southwest Land Division (SWLD) as a cloudband associated with tropical cyclone Narelle brought some heavy falls. Below average rainfall was mainly confined to parts of the Kimberley and northeast Southern Interior as monsoonal activity was confined to a brief period in the middle of the month with the majority of rainfall a result of diurnal shower and thunderstorm activity.

Averaged across the state as a whole, rainfall during January 2013 was close-to-average for WA, while for the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) and the SWLD January 2013 rainfall was above average.

Although a short-lived weak system, tropical cyclone Peta moved across the Pilbara coast near Roebourne on the afternoon of the 23rd and weakened to a tropical low. It brought significant rainfall to eastern coastal and central inland parts of the Pilbara from the 20th to the 25th with numerous daily falls over 100 mm reported. The highest daily fall during the event was 261.6 mm at Hooley on the 24th, which was the highest daily rainfall in WA for the month, and the wettest day at Hooley in 29 years of record. Mount Florance recorded 220.0 mm also on the 24th, its wettest January day in 106 years of record, whilst the following day Wittenoom recorded 228.0 mm, its highest daily fall in January in 58 years of record. Between 0900 WST on 22nd and 0900 WST on 25th, Hooley, Wittenoom, and Mount Florance all reported over 300 mm, with Hooley recording the highest total of 377.0 mm. Flooding impacts were generally localised and mostly minor.

Tropical cyclone Narelle moved southward parallel with the WA west coast from the 12th to the 15th and weakened into a low as a cloudband associated with the tropical low, and consequent thunderstorm activity due to increased atmospheric moisture, brought unseasonal rainfall to western and southern parts of the State. The highest daily falls were in the 50 mm to 100 mm range in the Central West, Central Wheat Belt, and Goldfields. This event brought the majority of Kellerberrin's January rainfall total of 104.3 mm, and was the main reason for the site recording its wettest January in 119 years of recording.

Maximum temperature

Maximum temperatures during January 2013 were above- to very-much-above-average over much of western, southern, and eastern WA, as well as large parts of the Kimberley, with daytime temperatures up to 4 °C above normal in the eastern Southern Interior, as well as in the Shark Bay area of the west Gascoyne. Below average maxima were confined to the Pilbara, due to the relatively wet and cloudy month, with daytime temperatures to 2 °C below normal in central and western parts of the district.

When averaged across the state as a whole, the mean maximum temperature for WA for January 2013 was well above average and ranked eleventh-highest since comparable records commenced in 1910, continuing the run of above average monthly mean maxima for WA since April 2012. When averaged across the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay), the mean maximum temperature was above average.

January 2013 began with very hot conditions in southern and southeast WA on the 1st as the trough near west coast moved eastward, and temperatures reached the low-to-mid forties. The hot conditions shifted to the southeast corner of WA on the 2nd and 3rd and intensified as the trough moved slowly eastward. Eucla recorded a daily maximum temperature of 48.2 °C on the 3rd, which exceeded the previous highest January temperature at the site in its 51 years of record of 47.9 °C on 3 January in 1979. Red Rocks Point (west of Eucla) registered 48.6 °C on the same day, which was the highest temperature at that site in its 9 years of record, and the highest temperature recorded in the Eucla district in almost 31 years, since Mundrabilla Station recorded a maximum temperature of 48.6 °C on 15 February 1983. Exceptional conditions were also experienced in the inland Gascoyne, northern Goldfields, and Northern and Southern Interior from the 7th to the 10th as a very hot airmass lay over the region with clear skies and light winds. A number of sites recorded their hottest January day on record multiple times during this period, including Paynes Find, Yeelirrie, Wiluna, and Meekatharra Airport. Leonora in the Goldfields broke its previous record of 47.8 °C twice, on the 8th (48.3 °C), and 9th (49.0 °C), with the latter being the highest temperature of the month in WA. Giles Meteorological Office in the Southern Interior saw four consecutive days with temperatures above 44 °C between the 7th and 10th, and in its 57 years of record had only recorded consecutive days over 44 °C once before, on 1 and 2 January 1973. Giles twice broke its all-time record temperature during this spell but high temperatures returned from the 13th to 17th and a daily maximum temperature of 45.7 °C on the 16th became the new record high for the site. Partly as a result of these hot spells, Giles Meteorological Office recorded its equal highest January mean maximum temperature with 40.3 °C, only 0.1 °C behind its hottest month on record; February 2007. Ongerup in the South Coastal also recorded its equal warmest January on record.

Minimum temperatures

Minimum temperatures during January 2013 were above- to very-much-above-average across most of the State, with areas of highest on record in the Great Southern, South and Southeast Coastal as several sites recorded their warmest or equal warmest January on record. Overnight temperatures were up to 5 °C above average in the southeast Northern Interior, north of Giles. In contrast, parts of the southeast Pilbara and eastern Gascoyne recorded below average overnight temperatures with mean minima 2 °C to 3 °C below normal in the east Gascoyne.

When averaged across WA as a whole, the mean minimum temperature during January 2013 was well above average and ranked as the third-warmest January on record. This continues a recent very warm trend for WA January minimum temperatures with the warmest five Januarys being 2011 (1st), 2008 (2nd), 2013 (3rd), 2010 (4th), 2009 (5th) from comparable temperature records commencing in 1910. The Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay) also saw well above normal overnight minima, with the region observing its eighth-warmest January, continuing a run of above average January mean minima for the region with 2012 being the warmest on record and 2011 fifth-warmest.

Very warm nights were reported across southern WA to start the month and Cape Leeuwin in the Southwest recorded a daily minimum temperature of 23.8 °C on the 1st, breaking its previous warmest January night in 107 years of record of 23.5 °C set on 26 January 2012. Very warm nights were reported across much of WA between the 6th and 10th and several sites in the Southwest district reported record high minima on the 8th, along with Merredin in the Central Wheat Belt and Paynes Find in the southern Gascoyne. Cape Leeuwin reported a minimum of 24.2 °C, again exceeding its January record. Wiluna recorded an overnight temperature of 33.5 °C on the 9th, the highest minimum temperature of the month for WA. Very warm nights were again experienced in much of WA between the 15th and 17th and Perth Airport recorded its highest January minimum in 69 years of record on the 15th with 27.8 °C, whilst Albany Airport recorded a minimum of 20.9 °C, almost 1 °C above its previous January record. Large parts of WA welcomed cooler than normal nights in the last week of January.

Tropical Cyclones

Severe tropical cyclone Narelle formed well north of the Australian coast on the 8th and took a general southwesterly track, intensifying to a category four system on the 11th north-northwest of Exmouth. Narelle moved south-southwest off the WA west coast and was downgraded to a low early on the 15th, over 500 km to the west of Geraldton. Although threatening the Pilbara and Gascoyne coasts and disrupting shipping and offshore industries, Narelle remained far enough offshore not to directly impact the northwest coast. A tidal surge was recorded from Onslow to Busselton as a result of Narelle causing some inundation of low lying areas, though any impacts were minor.

A tropical low formed over in the Kimberley on the 20th and tracked southwest through the west Kimberley then close to and parallel with the Pilbara coast before turning to the southwest towards the Pilbara coast early on the 23rd. The system intensified into tropical cyclone Peta (category 1) on the morning of the 23rd and crossed the coast near Roebourne then weakened to a tropical low in the afternoon on the 23rd. Although tropical cyclone Peta was short-lived and relatively weak, its proximity to the coast resulted in disruptions to shipping and offshore industries. There was also significant rainfall along parts of the Pilbara coastline and in the Fortescue catchment, with accumulated falls over 300 mm reported, leading to minor flooding.

Extremes Maps Records Summaries Important notes the top

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Extremes in January 2013
Hottest day 49.0 °C at Leonora on the 9th
Warmest days on average 40.5 °C at Telfer Aero
Coolest days on average 24.5 °C at Albany
Coldest day 18.7 °C at Norseman Aero on the 12th
Coldest night 3.8 °C at Eyre on the 30th
Coolest nights on average 13.2 °C at Rocky Gully
Warmest nights on average 27.0 °C at Broome Airport
27.0°C at Karratha Aero
Warmest night 33.5 °C at Wiluna on the 9th
Wettest overall 430.6 mm at Wittenoom
Wettest day 261.6 mm at Hooley on the 24th
Highest wind gust 109 km/h at Mount Magnet Aero on the 23rd
109 km/h at Wyndham Aero on the 27th

Maps


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

Record highest January daily rainfall
Highest daily rainfall
in January 2013 (mm)
Previous wettest
for January
Years of
record
Mount Florance 220.0 on the 24th 176.0 on the 25th in 1961 106
Wittenoom 228.0 on the 25th 170.8 on the 13th in 2012 58



Record highest total January rainfall
Total rainfall
for January 2013 (mm)
Previous wettest
for January
Years of
record
Average for
January
Kellerberrin 104.3 100.4 in 1990 120 13.5




Record highest January temperature
Highest temperature
in January 2013 (°C)
Previous warmest
for January
Years of
record
Average for
January
Meekatharra Airport 47.1 on the 8th 45.7 on the 5th in 2008 63 38.3
Giles Meteorological Office 45.7 on the 16th 44.8 on the 28th in 2011 57 37.3
Leonora 49.0 on the 9th 47.8 on the 17th in 1958 57 37.0
Wiluna 48.0 on the 8th 46.9 on the 1st in 1990 56 37.9
Eucla 48.2 on the 3rd 47.9 on the 3rd in 1979 51 25.9
Yeelirrie 47.9 on the 8th 45.8 on the 7th in 1983 40 37.9
Paynes Find 47.2 on the 8th 46.5 on the 20th in 1991 34 37.4




Record highest January daily minimum temperature
Highest daily minimum
temperature
in January 2013 (°C)
Previous warmest
for January
Years of
record
Average for
January
Cape Leeuwin 24.2 on the 8th 23.5 on the 26th in 2012 107 16.9
Broome Airport 30.5 on the 27th 30.2 on the 30th in 1988 74 26.3
Perth Airport 27.8 on the 15th 27.3 on the 21st in 1989 69 17.0
Pemberton 23.8 on the 8th 23.3 on the 16th in 1968 55 13.2
Albany Airport Comparison 20.9 on the 16th 20.0 on the 26th in 1974 48 13.7
Merredin 29.7 on the 8th 29.2 on the 5th in 1977 48 17.7
Paynes Find 30.8 on the 8th = 30.8 on the 3rd in 2008 34 20.9
Jarrahwood 26.0 on the 8th 24.3 on the 12th in 1978 31 12.6



Record highest January mean daily minimum temperature
Mean daily minimum
temperature
for January 2013 (°C)
Previous warmest
for January
Years of
record
Average for
January
Albany 17.3 = 17.3 in 2011 95 15.1
Ongerup 15.6 15.4 in 2001 46 13.8
Esperance 17.3 17.0 in 2001 43 15.6
Christmas Island Aero 23.2 23.1 in 2010 39 22.6
Wagin 16.3 16.1 in 2012 39 14.5
Hyden 17.5 17.3 in 2011 38 15.5



Summary statistics for January 2013
Maximum temperatures
for January
(°C)
Minimum temperatures
for January
(°C)
Rainfall
for January
(millimetres)
Mean for
January
2013
Diff
from
average
Highest for
January
2013
Mean for
January
2013
Diff
from
average
Lowest for
January
2013
Total for
January
2013
Average
for
January
Rank of
January
2013
Fraction of
January
average
North Kimberley (district 01)
Doongan 33.6 +0.4 36.6 27th 22.9 +0.1 20.6 13th 139.5 299.9 v low 47%
Kalumburu 34.1 +0.3 37.0 25th 24.9 +0.3 22.2 30th 286.4 303.9 average 94%
Mount Elizabeth 33.8 +0.8 38.5 27th 22.9 +0.9 19.5 12th 206.6 255.7 average 81%
Troughton Island 32.3 +0.5 34.7 3rd 27.2 +0.9 24.3 8th 183.4 269.8 average 68%
Truscott 33.1   37.3 4th 25.9   22.7 29th 269.0
Wyndham 37.5 +0.6 41.6 25th 26.8 +0.5 21.9 29th 139.4 184.9 average 75%
Wyndham Aero 37.8 +1.4 42.7 25th 26.5 +0.3 20.9 29th 125.4 189.7 low 66%
East Kimberley (district 02)
Argyle Aerodrome 38.3 +1.8 42.1 27th 26.7 +1.1 22.3 17th 108.2 152.3 average 71%
Halls Creek Airport 38.3 +1.6 40.6 25th 25.3 +1.0 20.9 18th 105.6 150.7 average 70%
Kununurra Aero 37.3 +1.4 43.1 25th 25.2 +0.1 21.4 31st 228.2 198.6 average 115%
Warmun 38.5 +1.3 42.8 16th 25.8 +1.0 21.8 21st 123.4 178.7 average 69%
West Kimberley (district 03)
Bidyadanga 35.9 +1.5 42.0 27th 26.8 +0.8 23.8 3rd 106.2 126.9 average 84%
Broome Airport 34.9 +1.6 40.4 27th 27.0 +0.7 23.2 3rd 112.6 178.7 average 63%
Curtin Aero 37.1 +0.7 41.1 15th 25.3 +0.3 21.3 2nd 157.2 215.5 low 73%
Cygnet Bay 34.0 +0.3 37.0 7th 26.2 +0.7 22.8 21st 131.1 239.9 average 55%
Derby Aero 36.2 +1.0 40.8 1st 26.4 +0.8 22.4 18th 243.8 200.3 average 122%
Fitzroy Crossing Aero 38.6 +1.0 42.7 6th 25.5 +0.3 21.0 17th 119.2 165.9 low 72%
West Roebuck 35.9 +1.8 41.1 27th 26.3 +1.1 21.9 3rd 134.4 204.5 average 66%
De Grey (district 04)
Bedout Island 35.0   37.0 29th        
Karratha Aero 36.7 +0.7 41.6 8th 27.0 +0.2 23.6 29th 111.0 49.3 high 225%
Legendre Island 34.1   37.6 8th 27.2   23.2 22nd
Mandora 37.7 +1.7 44.2 7th 26.5 +1.1 20.1 30th 117.6 84.2 high 140%
Marble Bar 40.0 -1.1 44.8 7th 26.7 0.0 22.7 31st 110.0 70.6 high 156%
Pardoo Station 37.5 +1.1 44.5 7th     23.5 22nd 219.5 63.5 v high 346%
Port Hedland Airport 37.7 +1.3 42.8 7th 26.6 +1.0 23.3 30th 158.0 63.6 high 248%
Roebourne 37.9 -0.8 44.0 7th 26.8 +0.6 24.0 24th 210.1 62.0 v high 339%
Roebourne Aero 37.5 -1.4 43.7 7th 26.2 -0.1 23.3 19th 236.6 85.7 high 276%
Fortescue (district 05)
Barrow Island Airport 34.6 +1.4 39.1 30th 27.4 +1.5 24.7 15th 29.0 24.8 average 117%
Learmonth Airport 37.8 -0.1 46.2 8th 25.3 +2.3 21.3 29th 67.8 32.4 high 209%
Mardie 38.0 0.0 45.0 8th 26.8 +1.8 24.1 29th        
Onslow Airport 37.8 +1.4 46.8 8th 26.6 +2.3 23.7 4th 52.4 40.9 high 128%
Wittenoom 37.5 -2.1 45.0 9th 25.1 -0.9 21.1 30th 430.6 113.7 v high 379%
West Gascoyne (district 06)
Carnarvon Airport 35.0 +3.8 44.6 31st 24.3 +1.8 22.3 7th 28.0 12.3 high 228%
Denham 33.5 +3.0 43.2 31st 23.1 +1.1 18.8 18th 17.6 7.7 high 229%
Emu Creek Station 40.0 -1.2 45.8 8th 26.0 +1.5 22.5 7th 98.8 47.4 high 208%
Murchison 39.6 +0.3 45.0 8th         10.3 19.8 average 52%
Shark Bay Airport 36.2 +2.5 44.5 31st 22.9 +1.5 19.6 5th 26.6 10.2 high 261%
East Gascoyne (district 07)
Newman Aero 38.2 -1.0 45.6 8th 24.6 -0.3 18.1 30th 83.8 62.7 high 134%
Paraburdoo Aero 39.9 -0.9 46.4 8th 25.9 0.0 22.0 31st        
Murchison (district 07A)
Meekatharra Airport 38.8 +0.5 47.1 8th 24.6 +0.3 20.7 13th 19.8 28.1 average 70%
Mount Magnet Aero 38.3 +0.5 47.4 8th 23.5 +0.1 18.7 4th 42.4 26.6 high 159%
Paynes Find 37.1 -0.3 47.2 8th 21.6 +0.7 15.7 26th 9.8 18.6 average 53%
North Coast (district 08)
Dalwallinu 35.2 -0.1 43.9 8th 19.2 +1.2 14.2 18th 35.0 24.7 average 142%
Eneabba 37.1 +0.8 42.5 22nd     14.3 4th 11.4 7.4 high 154%
Geraldton Airport 33.4   41.2 31st 19.7   12.6 18th 11.6
Geraldton Airport Comparison 33.4 +1.7 41.9 31st 19.4 +1.1 12.0 18th        
Kalbarri 34.9 +1.7 42.4 31st 21.2 +1.7 15.0 18th 26.7 4.9 v high 545%
Morawa Airport 37.7 +0.5 45.1 8th 20.8 +1.1 15.8 18th 8.2 23.3 average 35%
Mullewa 38.2 +1.4 43.3 22nd 21.7 +2.3 16.6 10th 7.0 12.9 average 54%
North Island 29.0 +1.7 36.0 6th 22.2 +1.0 20.2 18th 4.4 2.6 high 169%
Wongan Hills 34.7 +0.1 44.7 8th 19.3 +1.5 13.5 18th 73.8 14.3 v high 516%
Central Coast (district 09)
Badgingarra Research Stn 34.1 -0.6 41.0 8th 18.4 +1.4 11.7 4th 26.0 9.5 high 274%
Bickley 30.3 -0.3 38.2 8th 16.4 +1.1 10.9 18th 17.2 18.0 average 96%
Champion Lakes 31.6   38.8 8th 19.5   14.1 18th 8.2
Garden Island HSF 27.3 0.0 33.9 31st 20.0 +1.2 15.1 18th 4.6 11.0 average 42%
Gingin Aero 33.0 -0.1 40.8 8th 17.8 +1.4 12.1 5th 14.6 15.9 average 92%
Gosnells City 33.3 +0.2 39.9 8th     13.8 22nd 1.2 11.8 average 10%
Jandakot Aero 31.6 +0.3 38.3 8th 18.3 +1.6 12.1 5th 6.4 14.4 high 44%
Jurien Bay 31.8 +1.8 39.5 31st 18.7 +1.5 12.2 18th 8.6 6.9 high 125%
Karnet 29.9 -0.8 36.6 5th 16.5 +1.2 10.8 18th 18.9 17.4 high 109%
Lancelin 31.1 +2.0 39.0 7th 18.3 +0.8 11.0 18th 19.0 9.0 high 211%
Pearce RAAF 34.0 +0.5 41.1 8th 18.2 +1.2 12.6 5th 8.8 7.8 high 113%
Perth Airport 32.3 +0.6 39.4 8th 18.5 +1.5 12.7 5th 7.4 9.7 average 76%
Perth Metro 31.7 +0.6 39.1 8th 19.3 +1.3 14.0 5th 7.2 9.7 average 74%
Rottnest Island 27.1 +0.7 33.1 7th 20.0 +0.9 15.6 18th 6.6 7.8 high 84%
Swanbourne 30.9 +1.2 37.6 8th 19.1 +1.0 14.1 18th        
South Coast (district 09A)
Albany 24.5 +1.7 38.1 6th 17.3 +2.2 10.4 29th 30.6 24.0 high 128%
Albany Airport 26.5   40.6 1st 14.8   6.5 29th 26.8
Albany Airport Comparison 26.3 +1.6 40.3 1st 14.7 +1.0 6.4 29th 7.2 23.7 low 30%
Bridgetown 29.9 +0.1 39.9 8th 14.1 +1.0 4.9 25th 2.2 15.4 average 14%
Bunbury 29.6 -0.1 37.5 7th 16.5 +1.1 10.2 18th 2.0 11.8 average 17%
Busselton Aero 30.2 +0.1 38.3 7th 15.0 +0.8 8.4 25th 3.0 12.0 average 25%
Cape Leeuwin 24.8 +1.8 33.2 7th 18.6 +1.7 14.6 25th 3.6 16.2 low 22%
Cape Naturaliste 27.3 +1.9 36.6 7th 16.7 +1.5 12.0 18th 1.8 10.6 average 17%
Collie East 30.3 -0.3 35.9 8th 14.4 +1.0 7.0 25th 18.0 17.7 average 102%
Dwellingup 30.2 +0.6 37.4 8th 15.7 +1.5 9.5 18th 19.8 15.7 high 126%
Esperance 27.3 +1.2 45.4 1st 17.3 +1.7 10.8 29th 22.4 27.6 average 81%
Esperance Aero 29.5 +2.0 45.5 1st 16.3 +1.5 9.5 29th 35.6 28.0 high 127%
Harvey 30.6 -0.5 37.8 8th         14.7 13.3 average 111%
Hopetoun North 24.6 -0.8 39.6 6th 14.1 -1.2 7.3 29th 28.8 44.1 average 65%
Jarrahwood 30.5 +1.1 39.3 8th 13.8 +1.2 5.0 25th 19.0 14.4 high 132%
Mandurah 29.5 +0.3 37.7 8th 19.8 +1.0 14.7 18th 5.8 17.5 average 33%
Manjimup 28.4 +1.3 41.1 8th 14.4 +1.3 8.8 25th 24.8 19.6 high 127%
North Walpole 25.8   39.3 8th 15.2   9.4 29th 18.8 28.4 average 66%
Pemberton 27.4 +1.3 40.1 8th 14.4 +1.2 7.5 25th 12.5 21.8 average 57%
Rocky Gully 29.0 +1.7 41.2 8th 13.2 +0.6 5.7 29th 14.4 17.3 average 83%
Windy Harbour 24.9 +1.7 35.4 8th 15.9 +1.6 7.8 29th 3.6 15.9 v low 23%
Witchcliffe 27.9 +1.6 38.6 7th 15.1 +1.2 9.4 5th 15.2 11.7 average 130%
North Central (district 10)
Bencubbin 34.4 -0.1 44.2 8th 19.4 +1.3 13.5 18th 48.6 16.6 high 293%
Cunderdin Airfield 34.7 0.0 44.0 8th 18.8 +1.6 13.7 18th 29.8 24.2 high 123%
Kellerberrin 34.1 +0.1 44.8 8th 18.0 +1.1 12.0 25th 104.3 13.5 highest 773%
Merredin 34.6 +0.8 43.9 8th 18.8 +1.1 13.2 18th 57.8 14.7 v high 393%
Northam 34.5 +0.3 43.3 8th 18.7 +1.6 12.9 18th 18.4 10.4 high 177%
York 34.2 0.0 43.6 8th 17.9 +1.5 12.5 4th 13.2 28.9 average 46%
South Central (district 10A)
Beverley 34.7 +0.5 43.0 8th 17.9 +1.6 12.6 29th 18.4 11.9 high 155%
Brookton 33.2 +0.3 42.7 8th 17.1 +1.7 11.6 18th 23.8 12.7 high 187%
Corrigin 32.7 +0.2 42.1 8th 17.4 +1.6 11.8 25th 89.3 17.0 v high 525%
Hyden 33.6 0.0 44.5 1st 17.5 +2.0 11.4 25th 47.9 19.5 v high 246%
Jacup 30.1 +2.7 45.4 1st 14.0 +1.0 5.9 25th 34.4 35.3 average 97%
Katanning 31.4 +1.6 42.5 15th 14.8 +1.2 8.5 25th 35.4 28.3 average 125%
Lake Grace 32.0 +1.1 43.1 1st 16.7 +1.5 10.8 25th 28.2 41.9 average 67%
Narembeen 34.2 +0.2 43.1 8th 17.9 +1.4 12.0 25th 73.6 16.8 v high 438%
Narrogin 31.7 +0.7 41.7 8th 16.5 +2.4 10.6 25th 20.2 12.9 high 157%
Newdegate Research Station 32.2 +1.4 44.2 1st 15.4 +1.6 7.6 25th 23.8 19.0 high 125%
Ongerup 30.3 +1.7 43.0 1st 15.6 +1.8 8.2 25th 13.1 18.7 average 70%
Pingelly 32.5 +0.7 42.2 8th 16.8 +1.3 11.6 25th 10.4 11.0 high 95%
Ravensthorpe 29.8 +0.9 43.8 1st 15.8 +1.7 7.7 25th 35.7 25.0 high 143%
Wagin 32.0 +1.0 41.6 15th 16.3 +1.8 10.2 25th 25.8 12.8 high 202%
Wandering 32.3 +0.3 41.6 8th 15.2 +1.1 8.6 25th 16.0 18.4 average 87%
Eucla (district 11)
Balladonia 32.9 +1.6 46.8 2nd 16.3 +1.7 10.0 25th 24.8 18.7 high 133%
Eucla 28.5 +2.6 48.2 3rd 18.1 +1.6 9.2 30th 8.2 14.6 average 56%
Eyre 28.3 +1.9 47.7 2nd 15.8 +0.5 3.8 30th 26.7 16.0 high 167%
Forrest 35.6 +2.6 47.9 3rd 17.5 +1.4 10.5 29th 2.4 23.1 low 10%
Red Rocks Point 26.6   48.6 3rd 18.7   10.4 30th 18.2 23.5 high 77%
South East (district 12)
Bulga Downs 38.6 +0.9 47.9 8th 22.9 +0.5 16.6 30th 22.0 28.1 average 78%
Kalgoorlie-Boulder Airport 33.8 +0.1 46.1 9th 19.7 +1.4 13.3 18th 66.2 24.2 v high 274%
Laverton Aero 37.5 +2.2 47.6 8th 23.2 +1.8 15.3 25th 56.8 42.6 average 133%
Leinster Aero 38.2 +1.0 47.8 8th 23.9 +0.8 16.0 26th 40.8 37.9 average 108%
Leonora 38.1 +1.1 49.0 9th 23.0 +1.3 16.0 26th 35.8 24.7 high 145%
Leonora Aero 37.7   48.3 8th 23.2   16.4 30th 35.4
Munglinup West 30.6 +2.3 46.1 1st 15.4 +1.0 8.5 25th 15.8 49.2 low 32%
Norseman Aero 33.0 +0.6 43.9 8th 17.2 +1.5 7.6 25th 38.6 38.5 average 100%
Salmon Gums Res.Stn. 32.0 +1.4 44.1 1st 15.3 +1.4 5.2 25th 10.8 26.7 average 40%
Southern Cross Airfield 35.0 +0.3 45.3 9th 18.9 +1.3 11.8 25th 30.6 29.7 average 103%
Yeelirrie 38.6 +0.7 47.9 8th 22.0 -0.2 14.4 31st 42.4 29.0 high 146%
North East (district 13)
Carnegie 39.8 +1.0 47.7 8th 24.4 +0.6 18.0 30th 33.4 30.1 average 111%
Giles Meteorological Office 40.1 +2.8 45.7 16th 25.3 +1.8 17.9 27th 2.2 30.0 v low 7%
Telfer Aero 40.5 0.0 46.8 7th 26.5 +0.5 22.3 17th 51.6 49.1 average 105%
Warburton Airfield 40.3 +2.4 47.7 10th 25.9 +3.1 17.9 30th 0.6 28.5 low 2%
Wiluna 39.7 +1.8 48.0 8th         37.5 35.2 high 107%
Offshore Islands (district 200)
Christmas Island Aero 28.7 +0.8 29.7 28th 23.2 +0.6 21.6 26th 239.2 300.7 average 80%
Cocos Island Airport 30.3 +0.6 31.5 26th 25.3 +0.5 23.9 17th 86.0 164.0 average 52%
Varanus Island 34.1 +2.1 38.2 8th 27.9 +1.8 25.1 13th 28.6 37.0 average 77%

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 10 am on Friday 1 February 2013. 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.

Further information

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