Monday, 30 April 2007 - Monthly Climate Summary for Adelaide Metro - Product code IDCKGC13R0

Adelaide Metro in April 2007
Wet finish to April

Summary

Most of the April monthly rainfall in Adelaide was recorded in the last week. Overall, rainfall in Adelaide during April was very much above average, while temperatures were above normal .

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Rainfall

Adelaide's rainfall for April 2007 was 76.4 mm, recorded on 7 days. This is 38.4 mm above, or twice, the normal of 38.0 mm on 8 days. This has been the wettest April since 2000 when 88.0 mm was recorded. Last year 52.4 mm was recorded in April on 15 days. The highest April rainfall on record was 105.6 mm in 1998.

The total rainfall for the first four months of 2007 was 158.0 mm. Last year 110.6 mm was recorded over the same period. Average rainfall for the first four months of the year is 97.1 mm. The total rainfall for the first two months of autumn, 2007, was 117.8 mm, which is only 4.0 mm short of the autumn average rainfall of 123.8 mm.

Some sites had their highest total April rainfall on record.

Some sites had their highest total April rainfall for at least 20 years.

Temperature

The mean maximum temperature for April 2007 was 24.7°C*, which is 2.1°C above the normal April mean maximum of 22.6°C. This has been the warmest April since 2005 when the mean maximum was 26.1°C The mean maximum for April last year was 20.6°C.

The mean minimum temperature for April 2007 was 14.4°C, which is 2.1°C above the April mean minimum of 12.3°C. The mean minimum for April last year was 12.3°C.

*calculated to 3pm 30 April 2007

Some sites had their highest April mean daily minimum temperature on record.

Some sites had their highest April mean daily minimum temperature for at least 20 years.

Further information

South Australian Regional Office
South Australian Climate Services Centre
Bureau of Meteorology
Phone (08) 8366 2600
Email climate.sa@bom.gov.au

Extremes

Hottest day
Highest temperature		 33.6°C at Edinburgh RAAF on the 10th
Warmest days on average
Highest mean daily maximum temperature		 25.4°C at Parafield Airport
Coolest days on average
Lowest mean daily maximum temperature		 23.4°C at Noarlunga
Coldest day
Lowest daily maximum temperature		 17.3°C at Noarlunga on the 28th
Coldest night
Lowest temperature		 5.6°C at Parafield Airport on the 22nd
Coolest nights on average
Lowest mean daily minimum temperature		 13.4°C at Edinburgh RAAF
Warmest nights on average
Highest mean daily minimum temperature		 15.2°C at Noarlunga
Warmest night
Highest daily minimum temperature		 24.1°C at Parafield Airport on the 10th
Wettest overall
Highest total rainfall		 101.8 mm at Edinburgh RAAF
Highest wind gust
 74 km/h at Edinburgh RAAF on the 28th

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Records

Record highest total April rainfall
Total rainfall
for April 2007 (mm) 		Previous highest
for April 		Normal for
April		 Years of
record
Edinburgh RAAF 101.8 79.0 in 1983 30.5 35

Highest total April rainfall for at least 20 years
Total rainfall
for April 2007 (mm) 		Most recent higher
for April 		Normal for
April		 Years of
record
Parafield Airport 83.2 94.6 in 1954 39.5 34


Record highest April mean daily minimum temperature
Mean daily minimum
temperature
for April 2007 (°C) 		Previous highest
for April 		Normal for
April		 Years of
record
Adelaide (Kent Town) 14.4 = 14.4 in 1980 12.3 31

Highest April mean daily minimum temperature for at least 20 years
Mean daily minimum
temperature
for April 2007 (°C) 		Most recent higher
for April 		Normal for
April		 Years of
record
Adelaide Airport 13.9 14.0 in 1968 11.7 39


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Summaries

Summary statistics for April 2007
Maximum temperatures
for April
(°C)		 Minimum temperatures
for April
(°C)		 Rainfall
for April
(millimetres)
Mean for
April
2007		 Diff
from
normal		 Highest for
April
2007		 Mean for
April
2007		 Diff
from
normal		 Lowest for
April
2007		 Total for
April
2007		 Normal
for
April		 Rank of
April
2007		 Fraction of
April
normal
Adelaide 24.8 +2.3 33.5 10th 14.4 +2.1 10.7 20th 76.4 39.3 high 194%
Adelaide Airport 24.2 +2.1 32.7 10th 13.9 +2.2 9.2 7th 73.6 34.9 very high 211%
Edinburgh RAAF 24.7 +1.9 33.6 10th 13.4 +1.8 7.2 22nd 101.8 30.5 highest 334%
Noarlunga 23.4 31.8 10th 15.2 10.1 22nd 62.8
Parafield Airport 25.4 +3.0 33.5 13th 13.5 +1.7 5.6 22nd 83.2 39.5 very high 211%

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Notes

This statement has been prepared based on information available at 3 pm on Monday 30 April 2007. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

Normals 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 "normal" 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, normal in decile 4 to 7, high in decile 8 or 9 and very high is in decile 10).
The Fraction of normal shows how much rain has fallen this time as a percentage of the long-term mean.

Further information

South Australian Regional Office
South Australian Climate Services Centre
Bureau of Meteorology
Phone (08) 8366 2600
Email climate.sa@bom.gov.au