Autumn 2011 Normal but Cloudy

 

Weather log autumn 2011Normal autumn weather was broken by an almost rainless period from mid-April to late May. Temperatures fell very low, particularly at night. The minimum of minus 2.8 degrees on 15/5/11 was a record for autumn. The coldest nights were exceptionally dry: 17/5/11 had the lowest Dew Point in thirteen years, -9.3°. Even during the extreme drought of July 2002, with four Dew Point readings below -6°, the air did not get nearly so dry.

On the average (as shown below) temperatures and the Dew Point were near normal, except that days were rather cool, as in autumn 2008. On average, that autumn, however, was much drier, with cold nights. Autumn 2007 had been very warm and wet.
This time, the percentage of mornings with more than 4/8 cloud was 43%. That almost matches last autumn’s 45% and is far above those of autumns in the previous decade, which averaged just 25%.
Rain fell on 21 days, an unusually large number. The total rainfall of 116.8 mm is on the 52nd percentile for autumn. It is 16 mm below the autumn average (133 mm).Climate autumn 2011

Data. Rainfall data is from Manilla Post Office, courtesy of Phil Pinch. Temperatures, including subsoil at 750 mm, and other data are from 3 Monash Street, Manilla.

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