Friday, 31 August 2012 - Monthly Climate Summary for South Australia - Product code IDCKGC23R0
South Australia in August 2012: A drier finish to winter
- Below average rainfall in the west, tending above average in some areas in the east and south of the state.
- No rainfall was recorded in some parts of the Pastoral Districts.
- Close to average daytime temperatures for most areas.
- Cold August nights in central South Australia.
In August 2012, South Australia received less than half of the long term average August rainfall for the state as a whole. Apart from the southern agricultural districts where rainfall was average, most locations received below average rainfall through August 2012. Parts of the lower south east of the state were the only areas to receive above average rainfall this August. The wettest periods for much of the state occurred between the 14th and 17th and between the 23rd and 25th. In the earlier period, a series of cold frontal systems and shower activity crossed southern parts of the state. The passage of a strong cold front on 16th produced squally showers and isolated thunderstorms with daily rainfall totals in excess of 30mm in the central and southeast districts. On the 23rd, a cold pool associated with a deep low pressure system produced heavy showers, hail and strong gusty winds for central and coastal areas. Daily rainfall totals for this event generally ranged between 20 to 35mm about central districts.
Rainfall totals over the pastoral districts were mostly below average tending to very much below average across the Northwest. Rainfall totals were typically less than 10mm, with a number of locations across the Northwest and Far North recording no rainfall though this is not unusual for this time of year across northern South Australia.
The wettest period for the Pastoral districts was on August 17th as a strong cold frontal system extended showers into the northern parts of the state. Most of the remainder of the month was without rain. Monthly totals generally ranged from 2 to 6 mm in the Northeast and Far North. Higher rainfall totals were observed in the far south of the northwest pastoral; the wettest overall was at Yardea in the Northwest Pastoral district with 17.0 mm.
Above average rainfall was generally recorded across the Eyre and Yorke Peninsulas, Kangaroo Island, the Mount Lofty Ranges, the Murray Valley and Murray Mallee during August. The lower South-east and much of the Fleurieu Peninsula and Murray Lower Lakes received above average rainfall this August. Otherwise rainfall was near average.
Totals were in the range of 20 to 60mm in most locations, but tending to higher totals up to about 100mm across the Mount Lofty Ranges and the southeast of the State. The wettest overall for the month in the agricultural districts was Bridgewater in the Mount Lofty Ranges with 161.3 mm.Some sites had their lowest total August rainfall on record. See a map of rainfall deciles.
The mean temperature (the average of the maximum and minimum temperatures) for South Australia as a whole in August 2012 was 0.6 °C above the long-term average. By contrast, August 2011 was 2.0 °C average. Mean temperatures at particular stations ranged from 7.2°C at Mount Lofty to 15.6°C at Oodnadatta Airport in the Far North.
Mean maximum temperatures over South Australia were generally above average in the Pastoral districts this August. Some locations were up 1.4 °C above average across the northwest of the state. Parts of the southeast coastal areas saw slightly below average daytime temperatures, elsewhere maximum temperatures were near normal.
The coldest periods for many locations occurred through the third week of August with a series of cold frontal systems crossing the state. A strong cold front brought daytime temperatures to well below average on the 23rd for several coastal and hills locations, and Mount Lofty recorded the coldest day of the month when its maximum temperature only reached 5.0°C, its coldest August day in 4 years.
The warmest day for much of the state occurred on the 22nd in the northerly air stream ahead of the strong cold front. The warmest day recorded was at Moomba Airport, reaching 34.3°C on the 22nd, the warmest August day at this location in 3 years.
Average daily maximum temperatures ranged from 9.8°C at Mount Lofty to 23.6°C at Oodnadatta Airport in the Northeast district.
See a map of maximum temperature anomalies.
Apart from some coastal locations and northern parts of the state, mean minimum temperatures were widely slightly below average across South Australia. The coolest part of the state with respect to overnight temperatures was through the far south of the northwest pastoral district where minimum temperatures were in excess of 1°C cooler than normal. Marla (Police Station) observed average August night-time temperature 1.3°C below average and also observed a record lowest August minimum temperature of -2.3 °C on the 12th.
The coldest nights for most of South Australia occurred on the 1st and 2nd as a high pressure ridge on the eastern border maintained mostly fine and clear skies across much of the state. The minimum temperature at Yunta fell to -4.5°C on the 1st; this was the coldest night for any location during the month, and the coldest August daily minimum since 2007.
The warmest nights for many locations occurred at the beginning of the second week of August in a warm north-westerly air-stream ahead of an approaching low pressure trough. Moomba Airport reported the warmest night for any location on the 23rd with a minimum of 16.8°C.
The warmest nights on average were observed at Neptune Island with 11.2°C. The coolest nights on average were observed at Yongala with 2.9°C.Some sites had their lowest August temperature on record. See a map of minimum temperature anomalies.
|Extremes in August 2012|
|Hottest day||34.3 °C at Moomba Airport on the 22nd|
|Warmest days on average||23.6 °C at Oodnadatta Airport|
|Coolest days on average||9.8 °C at Mount Lofty|
|Coldest day||5.0 °C at Mount Lofty on the 23rd|
|Coldest night||-4.5 °C at Yunta Airstrip on the 1st|
|Coolest nights on average||2.9 °C at Yongala|
|Warmest nights on average||11.2 °C at Neptune Island|
|Warmest night||16.8 °C at Moomba Airport on the 23rd|
|Warmest on average overall||15.6 °C at Oodnadatta Airport|
|Coolest on average overall||7.2 °C at Mount Lofty|
|Wettest overall||161.3 mm at Bridgewater|
0 mm at Coober Pedy Airport|
0 mm at Ernabella (Pukatja)
0 mm at Marla Police Station
0 mm at Moomba Airport
0 mm at Oodnadatta Airport
0 mm at Wilpena Pound
|Wettest day||52.6 mm at Bridgewater on the 17th|
|Highest wind gust||106 km/h at Neptune Island on the 16th|
|Record lowest total August rainfall|
for August 2012 (mm)
|Oodnadatta Airport||0.0||= 0.0||in 2011||64||8.1|
|Wilpena Pound||0.0||= 0.0||in 2002||33||43.8|
|Marla Police Station||0.0||= 0.0||in 2011||27||7.9|
|Record lowest August temperature|
in August 2012 (°C)
|Marla Police Station||-2.3||on the 12th||-2.1||on the 16th in 2002||27||6.3|
|Summary statistics for August 2012|
|Northwest (district 16)|
|Coober Pedy Airport||21.6||32.6||28th||6.9||1.3||1st||0|
|Marla Police Station||23.2||+1.0||33.8||28th||4.7||-1.6||-2.3||12th||0||7.9||lowest||0%|
|Roxby Downs (Olympic Dam Aerodrome)||20.8||28.8||22nd||3.4||-4.0||1st||0.6|
|Woomera Aerodrome||19.5||+0.6||27.8||22nd||5.7||-1.1||1.6||1st||0.8||13.5||v low||6%|
|Far North (district 17)|
|Leigh Creek Airport||19.6||+0.5||27.8||22nd||4.5||-1.7||-0.3||1st||2.0||15.6||low||13%|
|Western Agricultural (district 18)|
|Coulta (Coles Point)||16.0||-0.4||22.8||7th||7.4||-0.4||3.1||1st||41.0|
|North Shields (Port Lincoln AWS)||16.8||0.0||22.3||7th||6.7||-0.5||3.1||1st||60.8|
|Port Augusta Aero||19.9||27.1||22nd||4.9||-1.8||1st||8.2|
|Upper North (district 19)|
|Northeast (district 20)|
|Gluepot Reserve (Gluepot)||18.6||25.5||22nd||4.5||-3.4||1st||13.1|
|Lower North (district 21)|
|Clare High School||13.6||20.3||22nd||4.7||-0.8||1st||41.2|
|Port Pirie Aerodrome||17.4||23.1||22nd||5.7||0.1||1st||27.4|
|Port Pirie Nyrstar Comparison||17.9||-0.2||23.2||22nd||8.6||+0.4||3.5||1st||25.9||34.9||average||74%|
|Snowtown (Rayville Park)||16.5||23.4||22nd||4.3||-1.6||1st||31.0|
|Yorke Peninsula (district 22A)|
|Kangaroo Island (district 22B)|
|Parndana Cfs AWS||13.7||16.9||7th||6.0||3.3||4th||81.8|
|Adelaide Plains (district 23A)|
|Adelaide (Kent Town)||15.9||-0.8||21.1||22nd||7.7||-0.5||2.2||1st||68.0||68.8||average||99%|
|County Light (district 23B)|
|Rosedale (Turretfield Research Centre)||15.4||-0.4||22.0||22nd||5.1||-0.6||0.0||1st||49.9||57.3||average||87%|
|Mount Lofty Ranges (district 23C)|
|Hindmarsh Island AWS||15.9||22.0||28th||8.1||3.0||13th||46.8|
|Kuitpo Forest Reserve||12.7||17.8||22nd||6.4||2.9||1st||102.2|
|Mount Crawford (Mt Crawford AWS)||11.5||17.6||22nd||5.6||2.3||24th||80.6|
|Parawa (Second Valley Forest AWS)||12.0||14.9||7th||6.6||3.7||1st||98.2|
|Victor Harbor (Encounter Bay)||16.0||20.9||28th||6.1||0.9||27th||69.0|
|Upper Murray Valley (district 24A)|
|Loxton Research Centre||17.8||+0.3||23.2||22nd||4.7||+0.3||-2.2||1st||14.4||27.4||low||53%|
|Lower Murray Valley (district 24B)|
|Murray Bridge (Pallamana Aerodrome)||16.3||20.8||22nd||4.7||-1.8||13th||31.4|
|Murray Bridge Comparison||17.2||-0.3||21.5||22nd||5.7||-0.2||0.2||13th||39.3||37.2||average||106%|
|Murray Mallee (district 25A)|
|Upper Southeast (district 25B)|
|Lameroo (Austin Plains)||15.7||21.1||28th||4.0||-0.3||13th||38.4|
|Lower Southeast (district 26)|
|Cape Jaffa (The Limestone)||14.2||-0.4||16.4||22nd||8.2||+0.4||3.4||13th||80.4|
|Mount Gambier Aero||14.0||-0.1||17.4||22nd||6.0||+0.5||0.2||1st||106.6||95.2||average||112%|
A Monthly Climate Summary is prepared to list the main features of the weather in South 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 12 pm on Friday 31 August 2012. 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 20 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.