Adelaide Metro & Hills in January 2012: A hot start to 2012 with average rainfall

  • Temperatures up to 2C warmer than average, with Adelaide recording 11 consecutive days above 30C through January.
  • Average rainfall across the Plains and Hills.

Rainfall

Rainfall totals were typically average to slight above average across the Adelaide plains, generally about 20% above average, with totals of between 15 to 30 mm being reported at most locations. Rainfall across the Hills tended above average, where some locations received twice the January average with totals ranging from 20 to 60 mm. The highest rainfall total in the Adelaide and Hills region for January 2012 was 65mm, reported at Birdwood (Cromer Road) in the Mount Lofty Ranges. Much of the month's rainfall occurred between the 8th and 11th of January as a low pressure trough followed by a southwesterly airstream and a weak cold frontal system moved across southern parts of the State.

A total of 18.0 mm of rainfall was recorded on 5 rain days at Adelaide (Kent Town) during January 2012, only 1.3 mm below the long term January average with a median of 20.6 mm on 4 rain days. (Note: the rainfall total for the period is from the manually observed 203mm rain gauge making up the long term rainfall record. This may differ from totals on some Bureau's webpage as these may be from the automatic tipping bucket rain gauge).

Temperature

The first 3 days of 2012 were very hot across the Adelaide region as a high pressure system, located in the Tasman Sea, directed a hot northeasterly to northerly airstream over the State. The maximum temperature in Adelaide on January 1st reached 41.6 C, making it the warmest start to the year since 1900. Much of the month remained relatively warm, with a spell of hot conditions occurring through the last 2 weeks of the month. Adelaide (Kent Town) recorded 11 consecutive days of maximum temperatures above 30C from the 19th through to 29th, of which, there were 4 consecutive days above 35C from the 22nd through 25th.

Maximum temperatures were generally about 2.0C above average for January 2012 across the Adelaide metropolitan and Hills area. The January 2012 average maximum temperature at Adelaide (Kent Town) was 31.1C which is 1.9C above the long-term average of 29.2C. In comparison, January 2011 saw average maximum temperatures of 30.6C at Adelaide (Kent Town). January 2001 was the warmest on record for this site, when maximum temperatures averaged 33.7C.

The hottest day for January 2012 in the Adelaide region was on the 2nd, when 42.1C was recorded at Edinburgh RAAF aerodrome. Parafield Airport recorded the warmest days on average, with maximum temperatures averaging 32.5C for the month.

The coldest January day in 2012 at Adelaide (Kent Town) was on the 10th with the maximum reaching 22.1C. The coldest maximum temperature recorded in the Adelaide and Hills area was on the 8th at Mount Lofty with 15.0C. The coolest days on average were recorded at Mount Lofty, where maximum temperatures averaged 25.3 C.

Minimum temperatures this January were up to 3C warmer than average across the Adelaide region. The average minimum temperature for January 2012 at Adelaide (Kent Town) was 19.1C, which is 2.0C above the long-term mean minimum temperature. In January 2011 the minimum temperature at Adelaide (Kent Town) averaged 18.3C. The coolest January at this site was in 1987 where the average for the month was only 14.1C.

The coolest nights on average in January 2012 were recorded at Mount Lofty, where minimum temperatures averaged 13.2 C. The coldest minimum temperature recorded for the month in the Adelaide and hills area was 7.5C on the 6th at Mount Lofty, whilst the warmest night was 29.2C at Adelaide (Kent Town) on the 2nd.

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Extremes in January 2012
Hottest day 42.1 °C at Edinburgh RAAF on the 2nd
Warmest days on average 32.3 °C at Parafield Airport
Coolest days on average 25.1 °C at Mount Lofty
Coldest day 15.0 °C at Mount Lofty on the 8th
Coldest night 7.5 °C at Mount Lofty on the 6th
Coolest nights on average 13.1 °C at Mount Lofty
Warmest nights on average 19.1 °C at Adelaide (Kent Town)
Warmest night 29.2 °C at Adelaide (Kent Town) on the 2nd
Warmest on average overall 25.4 °C at Adelaide (Kent Town)
25.4 °C at Parafield Airport
Coolest on average overall 19.2 °C at Mount Lofty
Wettest overall 34.6 mm at Mount Barker
Driest overall 11.2 mm at Adelaide Airport
Wettest day 23.2 mm at Noarlunga on the 8th
Highest wind gust 80 km/h at Edinburgh RAAF on the 7th




Summary statistics for January 2012
Maximum temperatures
for January
(°C)
Minimum temperatures
for January
(°C)
Rainfall
for January
(millimetres)
Mean for
January
2012
Diff
from
average
Highest for
January
2012
Mean for
January
2012
Diff
from
average
Lowest for
January
2012
Total for
January
2012
Average
for
January
Rank of
January
2012
Fraction of
January
average
Adelaide (Kent Town) 31.1 +1.9 41.6 1st 19.1 +2.0 14.1 9th 18.0 19.3 average 93%
Adelaide Airport 30.3 +2.3 39.8 1st 18.1 +2.2 13.5 16th 11.2 17.5 average 64%
Edinburgh RAAF 31.9 +2.0 42.1 2nd 18.2 +1.8 13.2 19th 26.8 20.8 high 129%
Mount Barker 28.2 +1.0 39.0 1st 13.9 +2.1 9.0 16th 34.6 25.8 high 134%
Mount Lofty 25.1   35.6 1st 13.1   7.5 6th 23.6
Noarlunga 29.3   40.1 1st 18.2   12.5 12th 26.0
Parafield Airport 32.3 +2.8 42.0 1st 18.4 +2.1 12.6 12th 25.2 20.9 average 121%

Notes

A Monthly Climate Summary is prepared to list the main features of the weather in Adelaide Metro & Hills 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 1 pm on Tuesday 31 January 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 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.

Further information

Media
(03) 9669 4057
Enquiries