Friday, 1 November 2013 - Monthly Climate Summary for Western Australia - Product code IDCKGC21R0
Rainfall in October 2013 was below to very much below average over central and eastern parts of the State, as well as in much of the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay). Conversely, much of the Pilbara and the north and west Kimberley received above to very much above average rainfall, with some sites breaking their October rainfall records. The fact that rainfall was above average in these regions is more a reflection on October being a typically dry month in the north, as rainfall totals for the month were generally low.
Averaged across WA as a whole, rainfall in October 2013 was near average. Similarly the Southwest Land Division (SWLD) in general saw a near average October, however averaged across the Lower Southwest, October 2013 was below average.
Weak cold fronts produced mainly light rainfall with isolated moderate falls in the Lower Southwest on the 5th and 6th, whilst a cold front moved across the southern half of the state on the 8th producing widespread light to moderate rainfall in western parts of the State. A trough and cloudband developed off the west coast and passed over western and southern parts of WA on the 9th resulting in rainfall over much of the SWLD, southern Goldfields, and western Eucla, with moderate falls near the Central West and Lower West coasts, and in the Southeast Coastal. Jurien Bay recorded 25.6 mm on the 9th, its highest October daily rainfall in 44 years of record. A weak cold front brought light rainfall to coastal parts of the SWLD on the 11th. Outside of the SWLD, isolated showers and thunderstorms were confined to the Kimberley up to the 13th, but from the 14th to 17th extended to the Pilbara and Northern Interior, and from the 18th were often reported through parts of northern, central, and eastern WA. Thunderstorms in the late morning and early afternoon on the 16th in the east Pilbara brought heavy rain to Yarrie, with the daily total of 26.0 mm to 9am on the 17th the highest October daily fall in 111 years of record at the site. An extensive cloudband with fronts and troughs moved across western and southern WA from the 18th to 20th bringing widespread rainfall to the southern Gascoyne, SWLD, southern Goldfields, and Eucla regions, with moderate falls in the western and southern SWLD. Warra Jarra in the South Coastal reported 36.4 mm on the 20th, its highest October daily fall in 35 years of record. A cloudband with embedded thunderstorms brought unseasonal rainfall to the Pilbara on the 26th and 27th. Although totals were generally less than 25 mm, both Dampier Salt and Karratha Aerodrome recorded their highest October daily rainfall in 44 and 39 years of record respectively. Further highlighting the climatologically dry nature of October in the Pilbara, a few sites recorded their wettest October on record as a result of very modest one day rainfall events. For instance, a rainfall event at Karratha Aerodrome of 6.0 mm on the 27th was enough to see Karratha Aerodrome register its wettest October, just exceeding the previous record of 5.9 mm in October 1975.
Very much above average mean maximum temperatures were observed over WA, with an area of highest on record in the west Kimberley. Fitzroy Crossing Aerodrome recorded a mean maximum of 42.0 ºC, the hottest October for the site in 16 years of record. More notably, however, this is the highest mean maximum temperature for October recorded in Australia, exceeding the previous record of 41.9 ºC at Fitzroy Crossing Aerodrome in 2002. Broome Airport also recorded its highest October mean maximum temperature in 74 years of record. Areas up to 4 °C warmer than normal were observed in the west Kimberley, as well as in central WA. Much of the Southwest Land Division was between 1 ºC and 2 ºC above average for mean maximum temperature in October 2013.
Averaged across the state as a whole, the mean maximum temperature for WA in October 2013 was very much above average and ranked as the second warmest October since comparable records commenced in 1910. This continues WA's run of above average mean monthly maxima since April 2012, with only June 2013 being below the average, and as a result WA has recorded its warmest January to October period on record in 2013. For the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay), the mean maximum temperature for October was above average, and for the January October period is the fifth warmest on record.
In the north, hot to very hot days were dominant with maxima in the high thirties to low forties common in the Kimberley, east Pilbara, and Northern Interior. The record breaking month at Fitzroy Crossing Aerodrome saw 29 consecutive days with a maximum temperature of 40 °C or higher (1st to 29th), which equalled the longest hot spell (consecutive days of 40 °C or higher) at the site for any month in its 16 years of record, equal with 29 days of 40 ºC or greater between 9 November and 7 December 2007, and is the longest such hot spell in October for any recording site in Australia. The highest temperature of the month in WA was 44.8 ºC at Fitzroy Crossing Aerodrome on the 18th. Both Argyle Aerodrome (19 years of record) and Curtin Aerodrome (23 years of record) in the Kimberley registered their greatest number of days at or above 40 ºC in October 2013, with 19 and 21 days respectively.
For the SWLD, warm to hot days were experienced on the 3rd, and from the 23rd to 31st, whilst mild days were observed on the 1st, 9th, 12th, and from the 19th to 21st. A number of sites in the SWLD recorded their mildest day for the month on the 19th with a cloudband, rainfall, and southerly winds dominating the weather. Rocky Gully in the South Coastal recorded the lowest maximum temperature in the State for the month with 11.2 ºC.
For the Goldfields, Southern Interior and Eucla, cool to mild days were reported on the 1st, 10th, 12th and 13th, and from the 20th to 23rd, whilst warm to hot days were reported from the 3rd to the 9th, 15th to 19th, and from the 25th onward. A maximum of 42.9 °C recorded on the 8th at Eucla was the equal hottest day in October in 52 years of record at the site, equal with 42.9 °C on 24 October 2008.
Most of the State saw above to very much above average mean minimum temperatures in October 2013, with areas up to 3 °C warmer than normal in the Pilbara and Southern Interior.
Averaged across the state as a whole, the mean minimum temperature for WA in October 2013 was ninth warmest on record, whilst averaged across the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay), the mean minimum temperature was also above average. Persistent mean minium temperatures for WA since September 2012 have led to the State recording its fourth warmest January to October period, whilst the Lower Southwest has recorded its third warmest January to October period, only behind 2011 and 1983.
In the north, nights were predominantly mild to warm, with cool nights at the start of the month in the Pilbara, and from the 5th to the 7th in the Kimberley. A very warm night was reported in the east Kimberley on the 9th and 10th as sites in the region recorded the highest minimum temperatures in the State for the month, the highest being 30.6°C on the 10th at Argyle Aerodrome. Particularly warm nights were also reported in the west Kimberley on the 27th and 28th, and Broome Airport recorded a daily minimum temperature of 28.6 °C on both these days, which is the highest minimum temperature recorded at Broome Airport in October in 75 years of record, exceeding the previous record of 27.9 °C on 28 October 1991.
For the Gascoyne, SWLD, Goldfields, Southern Interior, and Eucla, cool to cold nights were generally reported on the 1st and 2nd, 10th and 11th, between the 13th and 15th, on the 17th, and between the 21st and 23rd, whilst warm nights were reported on the 4th, 16th, 19th and 20th, and from the 24th to the end of the month. The lowest temperature in October 2013 in WA was recorded at Eyre in the Eucla on the 14th with -5.0 °C. This is the lowest temperature on record for WA in October, exceeding the previous record of -4.3 ºC at Eyre on 24 October 1995.
|Extremes in October 2013|
|Hottest day||44.8 °C at Fitzroy Crossing Aero on the 18th|
|Warmest days on average||42.0 °C at Fitzroy Crossing Aero|
|Coolest days on average||18.9 °C at Cape Leeuwin|
|Coldest day||11.2 °C at Rocky Gully on the 19th|
|Coldest night||-5.0 °C at Eyre on the 14th|
|Coolest nights on average||5.9 °C at Newdegate Research Station|
|Warmest nights on average|| 27.2 °C at Troughton
26.4 °C at Wyndham
|Warmest night||30.6 °C at Argyle Aerodrome on the 10th|
|Wettest overall||117.0 mm at Ellenbrae|
|Wettest day||53.0 mm at Truscott on the 15th|
|Highest wind gust||94 km/h at Kununurra Aero on the 13th|
|Record highest October daily rainfall|
| Highest daily rainfall
in October 2013 (mm)
| Previous wettest
|Yarrie||26.0||on the 17th||23.4||on the 26th in 1916||111|
|Dampier Salt||16.0||on the 27th||5.6||on the 15th in 1975||44|
|Jurien Bay||25.6||on the 9th||25.2||on the 29th in 2008||44|
|Karratha Aero||6.0||on the 27th||3.0||on the 15th in 1975||39|
|Warra Jarra||36.4||on the 20th||27.8||on the 26th in 1980||35|
|Record highest total October rainfall|
for October 2013 (mm)
|Dampier Salt||16.0||11.7||in 1975||44||0.8|
|Karratha Aero||6.0||5.9||in 1975||39||0.5|
|Highest total October rainfall for at least 30 years|
for October 2013 (mm)
Most recent October
at least this wet
|Broome Airport||8.8||28.0||in 1975||38||1.5|
* note: there are gaps in the historical record at this site, so it is possible a higher value has gone unreported.
|Record highest October temperature|
in October 2013 (°C)
|Northam||40.0||on the 30th||39.4||on the 26th in 1961||104||24.0|
|Mullewa||41.0||on the 30th||40.4||on the 27th in 1926||71||27.1|
|Carnamah||41.7||on the 30th||40.0||on the 24th in 1958||69||26.0|
|Corrigin||38.7||on the 30th||38.3||on the 30th in 1951||66||23.1|
|Eucla||42.9||on the 8th||= 42.9||on the 24th in 2008||52||23.1|
|Merredin||39.3||on the 30th||38.4||on the 25th in 1979||48||24.8|
|Badgingarra Research Stn||38.8||on the 30th||38.5||on the 29th in 1979||47||24.4|
|Brookton||37.9||on the 30th||37.1||on the 23rd in 1990||46||23.2|
|Beverley||39.4||on the 30th||38.4||on the 23rd in 1990||45||24.3|
|Wongan Hills||39.5||on the 30th||39.4||on the 25th in 1979||45||25.1|
|Narembeen||38.3||on the 30th||37.0||on the 31st in 1981||44||25.0|
|Pingelly||37.0||on the 30th||36.5||on the 23rd in 1990||42||22.2|
|Eneabba||40.0||on the 30th||= 40.0||on the 18th in 2009||40||26.4|
|Wagin||37.0||on the 30th||35.9||on the 23rd in 1990||40||21.8|
|Record highest October mean daily maximum temperature|
Mean daily maximum
for October 2013 (°C)
|Broome Airport||35.4||= 35.4||in 1961||74||32.9|
|Record highest October daily minimum temperature|
Highest daily minimum
in October 2013 (°C)
|Broome Airport||28.6||on the 27th & 28th||27.9||on the 28th in 1991||75||22.4|
|Emu Creek Station||25.5||on the 31st||24.8||on the 25th in 2012||42||16.9|
|Summary statistics for October 2013|
|North Kimberley (district 01)|
|East Kimberley (district 02)|
|Halls Creek Airport||38.2||+1.1||41.9||10th||24.4||+1.8||17.7||7th||4.2||17.6||average||24%|
|West Kimberley (district 03)|
|Broome Airport||35.4||+2.5||41.0||14th||24.3||+1.9||21.0||3rd||8.8||1.5||v high||587%|
|Fitzroy Crossing Aero||42.0||+2.2||44.8||18th||25.0||+2.2||21.9||7th||0.4||17.4||average||2%|
|De Grey (district 04)|
|Pardoo Station||37.2||+1.6||41.0||4th||20.7||+1.2||14.7||1st||1.4||0.8||v high||175%|
|Port Hedland Airport||37.1||+2.3||40.7||15th||20.3||+1.9||13.4||2nd||1.6||0.9||high||178%|
|Fortescue (district 05)|
|Barrow Island Airport||30.4||+1.1||34.5||13th||22.5||+0.9||17.0||2nd||1.4||2.4||high||58%|
|Fortescue Dave Forrest||36.2||39.6||18th||20.2||15.2||3rd||14.0|
|West Gascoyne (district 06)|
|Emu Creek Station||36.7||+2.4||40.8||17th||17.6||+0.7||15.2||26th||12.6||2.2||v high||573%|
|Shark Bay Airport||29.7||+1.5||37.8||29th||15.2||0.0||10.9||3rd||5.6||5.0||average||112%|
|East Gascoyne (district 07)|
|Murchison (district 07A)|
|Mount Magnet Aero||31.3||+2.1||40.6||31st||14.8||+0.5||8.1||1st||1.2||6.6||low||18%|
|North Coast (district 08)|
|Central Coast (district 09)|
|Badgingarra Research Stn||25.5||+1.1||38.8||30th||9.7||+0.3||4.4||1st||25.0||29.1||average||86%|
|Garden Island HSF||21.2||+0.3||32.6||30th||14.0||+0.6||8.7||1st||29.0||30.4||average||95%|
|Medina Research Centre||23.4||+0.8||37.1||30th||11.0||+0.7||5.0||1st||34.6||40.1||average||86%|
|South Coast (district 09A)|
|Esperance Aero||22.7||+1.5||32.9||31st||9.6||-0.1||4.0||1st||79.0||46.8||v high||169%|
|North Central (district 10)|
|South Central (district 10A)|
|Newdegate Research Station||24.2||+1.1||35.9||30th||5.9||-1.0||-2.0||13th||21.8||23.4||average||93%|
|Eucla (district 11)|
|South East (district 12)|
|Laverton Aero||31.3||+3.2||40.6||8th||15.0||+0.9||8.8||1st||0||13.1||v low||0%|
|Salmon Gums Res.Stn.||25.5||+2.1||38.9||31st||7.5||-0.1||-0.8||13th||40.6||27.4||high||148%|
|Southern Cross Airfield||27.1||+0.8||40.3||31st||10.1||+1.0||1.9||1st||32.8||14.5||high||226%|
|North East (district 13)|
|Giles Meteorological Office||33.8||+2.1||40.1||9th||18.1||+1.0||10.5||2nd||0||15.4||lowest||0%|
|Offshore Islands (district 200)|
|Christmas Island Aero||27.8||+1.0||28.5||16th||23.4||+0.8||22.0||29th||55.6||65.4||average||85%|
|Cocos Island Airport||28.9||+0.2||29.8||19th||25.2||+1.0||22.0||13th||21.0||83.5||low||25%|
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 November 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
(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.