Monday, 3 June 2013 - Monthly Climate Summary for Western Australia - Product code IDCKGC21R0
Rainfall during May 2013 was above to very much above average in the Kimberley and much of the Pilbara and Northern Interior, as well as parts of the Southern Interior, Goldfields, Gascoyne, Southwest, Southeast Coastal, and west Eucla. Theda and Camballin in the Kimberley, and Balladonia in the western Eucla recorded their wettest May on record, largely due to rainfall events toward the middle and second half of the month. For the remainder of the State, May rainfall was generally close to average.
Averaged across the state as a whole, rainfall during May 2013 was above average. For the Southwest Land Division (SWLD) and the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay), May 2013 rainfall was close to, but slightly above, the May average, resulting in their first 'above average' May since 2005.
May 2013 started with a cloudband moving through the SWLD and the adjacent
Gascoyne, Goldfields, and Eucla from the 1st to the 3rd, producing widespread
rainfall and isolated thunderstorms with moderate to heavy falls recorded in
the Southwest and southern parts of the Lower West.
A strong cold front moved across western WA during the evening of the 7th and morning of the 8th, resulting in thunderstorms, severe wind gusts, and widespread rainfall in western, central and southern WA. The heaviest falls were observed in the Southwest and Lower West districts with daily totals mostly in the 30 mm to 90 mm range, while moderate daily totals extended into the Central West, Gascoyne and west Pilbara. A very heavy fall of 100.8 mm in the 24 hours to 9am on the 8th at Aston Downs Alert (Southwest) was the highest daily total at the site in 10 years of record, and the highest daily total for May 2013 in the SWLD, while numerous other sites with mostly short periods of record observed their wettest May day on record. The cold front weakened and moved through southeastern WA on the 9th resulting in moderate rainfall in the Goldfields and Eucla, while two fronts passed the SWLD in succession on the 9th and the 10th, bringing further showers and isolated thunderstorms, severe winds gusts and moderate rainfall to the Southwest.
A cloudband associated with a cold front over southeast Australia produced rain and isolated thunderstorms with moderate rainfall in the Kimberley on the 12th and early on the 13th, whilst a middle level trough brought widespread rainfall to the Pilbara and west Kimberley on the 14th and 15th, with thunderstorms and heavy falls in the west Kimberley on the 15th. Storms persisted in the Kimberley to the 24th with further heavy falls reported. Very heavy rainfall in excess of 150 mm was reported on the northern Dampier Penninsula on the 19th and 20th as Cygnet Bay observed 155.4 mm in the 24 hours to 9am on the 21st, its wettest May day in 50 years of record. Lombadina Airstrip reported 182.5 mm on the 21st, the highest daily total in WA for May 2013.
Showers and thunderstorms produced moderate to heavy rainfall in the west Pilbara on the 26th and the 27th, causing localised flash flooding around Exmouth where a daily fall of 106.0 mm was reported at Exmouth Town in the 24 hours to 9am on the 27th.
A cold front moved across the southwest of WA overnight on the 29th and moved through central and southeastern WA on the 30th and 31st, bringing thunderstorms and moderate to heavy rainfall to western and southern parts of the SWLD. Particularly heavy falls were observed along the Southeast Coastal coast, with Esperance and Mt Howick observing their wettest May day in 44 and 40 years of record respectively with daily totals near 50 mm.
Much of WA recorded near average maximum temperatures in May 2013. Above to very much above average mean maximum temperatures were observed in most of the Kimberley, Southern Interior, and Eucla, with an area up to 4 °C warmer than normal in the eastern Eucla. Below average mean maximum temperatures were mainly confined to small areas in the the west Pilbara, inland Gascoyne, and Northern Interior.
Averaged across the state as a whole, the mean maximum temperature for May was near average for both WA and the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay).
During the first eight days of the month, unusually warm days were experienced in various locations in northern, central, and southeastern WA with daily maxima reaching the high thirties at times due to a number of slow moving troughs directing hot northerly winds over much of WA. Onslow Airport in the west Pilbara recorded a maximum of 38.8 °C on the 1st, its hottest May day in 48 years of record. Forrest in the Eucla district recorded a maximum temperature of 36.8 °C on the 2nd breaking its previous highest May temperature in 83 years of record of 36.6 °C on 3 May 1990, whilst Eucla town recorded a maximum temperature of 36.5 °C on both the 2nd and 8th, exceeding its previous highest May temperature (36.3 °C) in 52 years of record. Numerous other sites with shorter periods of record also registered their highest May temperature. Mandora in the west Kimberley recorded the highest temperature in WA in May with a maximum of 39.2 °C on the 6th.
In the last two days of the month, a strong cold front and a pool of cold air moved over southern WA and, along with cloud and rain, caused very low temperatures in the SWLD. Maximum temperatures below 10 °C were observed at a number of sites on the 30th as Jacup and Manjimup observed the lowest maximum temperature of the month in WA with 9.4 °C, and Ongerup registered its lowest maximum temperature in May in 48 years of record with 9.8 °C.
Most of WA was above to very much above average in terms of mean minimum temperatures during May 2013, with means up to 3 °C warmer than normal in the west and central Kimberley and Southern Interior, grading to 4 °C warmer than normal in parts of the Eucla. Large parts of western WA saw near average overnight temperatures, with a small area below average in the west Gascoyne.
Averaged across the state as a whole, the mean minimum temperature for May 2013 was the 9th warmest since comparable records commenced in 1910. Averaged across the Lower Southwest (southwest of a line from Jurien Bay to Bremer Bay), the mean minimum temperature in May 2013 was above average.
Warm northerly winds and cloud resulted in some very warm nights in northern, central, and eastern parts of WA during the first eleven days of the month. Balladonia in the western Eucla recorded a minimum temperature of 18.8 °C on the 2nd, which exceeded its previous May record of 17.5 °C set on 13 May 1972. Mardie in the Pilbara recorded a minimum of 25.1 °C on the 8th, its warmest May night in 56 years of record, whilst Giles in the Southern Interior recorded a minimum of 23.3 °C on the 9th, its warmest May night in 57 years of record.
A cold morning was experienced across the SWLD on the last day of May 2013 as mimimum temperatures dropped to below 5 °C at numerous sites and a number of sites registered sub-zero temperatures. A minimum of 3.3 °C at Lancelin (Lower West) on the 31st was its lowest May temperature in 46 years of record, whilst Collie East recorded a minimum of -0.6 °C, the lowest temperature recorded in WA in May 2013.
|Extremes in May 2013|
|Hottest day||39.2 °C at Mandora on the 6th|
|Warmest days on average||34.9 °C at Wyndham Aero|
|Coolest days on average||18.1 °C at Rocky Gully|
|Coldest day|| 9.4 °C at Jacup
on the 30th
9.4 °C at Manjimup on the 30th
|Coldest night||-0.6 °C at Collie East on the 31st|
|Coolest nights on average||6.3 °C at Jarrahwood|
|Warmest nights on average||26.4 °C at Troughton Island|
|Warmest night|| 28.2 °C at Troughton
Island on the 5th
27.7 °C at Karratha Aero on the 8th
|Wettest overall||276.4 mm at Mount William|
|Wettest day||182.5 mm at Lombadina Airstrip on the 21st|
|Highest wind gust||109 km/h at Cape Leeuwin on the 8th|
|Record highest May daily rainfall|
Highest daily rainfall
in May 2013 (mm)
|Cygnet Bay||155.4||on the 21st||124.0||on the 13th in 1997||50|
|Esperance||55.8||on the 31st||51.3||on the 23rd in 1971||44|
|Mount Howick||46.6||on the 31st||39.8||on the 5th in 1974||40|
|Record highest total May rainfall|
for May 2013 (mm)
|Record highest May temperature|
| Highest temperature
in May 2013 (°C)
| Previous warmest
|Eucla||36.5||on the 8th||36.3||on the 3rd in 1990||52||21.1|
|Onslow Airport||38.8||on the 1st||38.4||on the 1st in 2010||48||29.2|
|Record lowest May daily maximum temperature|
| Lowest daily maximum
in May 2013 (°C)
| Previous coolest
|Ongerup||9.5||on the 30th||10.0||on the 1st in 1968||45||18.9|
|Record highest May daily minimum temperature|
Highest daily minimum
in May 2013 (°C)
|Giles Meteorological Office||23.3||on the 9th||23.2||on the 13th in 1958||57||11.3|
|Mardie||25.1||on the 8th||25.0||on the 27th in 1998||56||16.9|
|Balladonia||18.8||on the 2nd||17.5||on the 13th in 1972||47||8.0|
|Record lowest May temperature|
in May 2013 (°C)
|Lancelin||3.3||on the 31st||3.9||on the 25th in 1979||46||12.5|
|Summary statistics for May 2013|
|North Kimberley (district 01)|
|Mount Elizabeth||30.9||+1.0||34.8||5th||15.8||+3.8||7.6||27th||67.7||14.7||v high||461%|
|East Kimberley (district 02)|
|Halls Creek Airport||30.7||+0.8||36.5||5th||18.0||+1.3||11.7||27th||19.0||12.8||high||148%|
|West Kimberley (district 03)|
|Broome Airport||31.6||+0.1||36.6||1st||20.2||+2.0||15.0||27th||116.6||27.3||v high||427%|
|Curtin Aero||33.6||+0.4||38.7||5th||19.3||+0.3||13.3||28th||79.6||15.7||v high||507%|
|Cygnet Bay||31.1||+0.1||35.4||5th||21.5||+2.5||15.4||30th||241.4||42.5||v high||568%|
|Derby Aero||32.7||0.0||38.3||4th||20.2||+1.4||14.3||26th||117.8||19.5||v high||604%|
|Fitzroy Crossing Aero||33.3||+0.3||38.5||6th||17.9||+2.3||10.1||26th||70.0||11.3||v high||619%|
|West Roebuck||32.3||-0.6||38.3||6th||19.7||+3.9||13.0||26th||128.6||18.6||v high||691%|
|De Grey (district 04)|
|Marble Bar||29.5||-1.7||37.9||7th||17.8||+0.9||13.5||16th||72.4||13.4||v high||540%|
|Port Hedland Airport||30.4||-0.2||37.7||1st||19.0||+1.8||13.3||23rd||46.8||27.2||high||172%|
|Fortescue (district 05)|
|Barrow Island Airport||26.8||-0.7||33.8||7th||21.5||+0.3||17.8||15th||37.0||55.4||average||67%|
|West Gascoyne (district 06)|
|Emu Creek Station||28.4||-1.6||38.5||1st||16.4||+0.4||12.0||15th||45.7||35.3||high||129%|
|Shark Bay Airport||26.1||-1.5||33.1||5th||14.4||-0.3||10.0||23rd||38.4||24.8||high||155%|
|East Gascoyne (district 07)|
|Murchison (district 07A)|
|Mount Magnet Aero||23.5||-0.5||35.1||1st||11.7||-0.1||5.1||31st||20.0||17.2||high||116%|
|North Coast (district 08)|
|Geraldton Airport Comparison||23.7||-0.4||29.6||5th||12.7||-0.2||5.2||31st||77.6||69.4||average||112%|
|Central Coast (district 09)|
|Badgingarra Research Stn||20.4||-2.2||27.8||1st||10.4||-0.3||4.4||31st||116.0||70.6||high||164%|
|Garden Island HSF||20.6||-1.0||23.8||7th||13.7||-0.3||9.2||31st||150.8||79.2||high||190%|
|Medina Research Centre||21.9||-0.2||26.3||1st||10.4||-0.1||2.1||31st||134.6||98.7||high||136%|
|South Coast (district 09A)|
|Albany Airport Comparison||19.0||0.0||23.7||7th||9.7||-0.1||3.5||29th|
|Busselton Aero||19.7||-1.0||23.0||3rd||9.1||-0.1||4.5||31st||205.6||103.6||v high||198%|
|North Central (district 10)|
|South Central (district 10A)|
|Lake Grace||19.2||-1.1||26.3||1st||9.8||+1.0||4.7||31st||66.2||30.1||v high||220%|
|Newdegate Research Station||19.0||-1.2||26.1||1st||8.1||+0.9||2.1||24th||59.0||43.7||high||135%|
|Eucla (district 11)|
|Red Rocks Point||22.7||36.8||2nd||13.3||7.9||31st||45.0||30.2||high||149%|
|South East (district 12)|
|Norseman Aero||20.6||-0.5||30.0||1st||8.9||+1.8||1.0||23rd||47.6||20.7||v high||230%|
|Salmon Gums Res.Stn.||20.2||+0.4||28.9||1st||8.4||+1.3||0.0||24th||49.8||34.3||high||145%|
|Southern Cross Airfield||21.3||-0.2||31.3||1st||9.0||+1.5||1.7||23rd||17.6||29.5||average||60%|
|North East (district 13)|
|Giles Meteorological Office||24.7||+1.0||33.1||4th||13.2||+1.9||6.5||16th||57.6||19.8||high||291%|
|Offshore Islands (district 200)|
|Christmas Island Aero||28.2||+0.4||29.8||14th||23.9||+0.1||21.7||10th||478.4||182.4||v high||262%|
|Cocos Island Airport||29.6||+0.4||31.5||7th||25.7||+0.7||22.4||25th||300.0||193.3||high||155%|
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 3 pm on Monday 3 June 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.