September 2015 cold and dry

Photo of native clematis

Native clematis

Few days or nights in September were warmer than normal. The 23rd was a very cold day (17.1°) and the 24th had a very cold morning (-0.1°). The weekly temperature was near normal in the third week, but it had been cool in the first. It was cold (4.7 below normal) in the fourth week, and was rising through normal at the month’s end.
As is usual in September, most days were fine, and they were much warmer than the nights. The afternoon humidity was low (24%), but not nearly as low as in 2013 (15%).
Rain fell on only four days, with the highest reading 8.6 mm on the 4th.

Weather log for September 2015

 Comparing September months

In a dramatic change from August, both days and nights were very cold, as they were in September 2004.
The aridity was not quite as bad as in 2013, when the dew point was lower and there was less cloud.
Such cold, dry conditions are not those of an El Niño event (hot and dry) or of a La Niña event (cold and wet). If more extreme, they would be those of a glacial period.
The rainfall of 15.9 mm was well below average, in the 22nd percentile. There are still no serious shortages in rainfall totals for small numbers of months. A severe shortage (4th percentile) has appeared in the 30 month total (1186 mm). There are still deep ponds in Greenhatch Creek.

Climate for September 2015

Data. All data, including subsoil at 750 mm, are from 3 Monash Street, Manilla. Rainfall data up to 26/3/15 is from Manilla Post Office, Station 055031.

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