Desert-like September 2013

September was an exceptionally arid month: like the Sahara Desert!

The daily weather logWeather log September 2013

Most days were warmer than normal, with the first 30-degree day of spring coming two weeks early, on Sunday the 8th. Weekly average temperatures showed two warm spells three degrees above normal. Half the mornings had completely blue skies. The air was extremely dry: the dew point early on the 12th was 6.3 degrees below zero, and all the afternoons of the final week had relative humidity below 10%.
Briefly, from the 16th to the 18th, the weather was cooler and more humid, with 19.4 mm of rain.

Comparing September monthsClimate September 2013.

Nearly all the monthly weather values were exceptional. As noted on the graph, they were record September values (from 1999): highest maximum and mean temperatures, widest daily temperature range, lowest dew point and fewest cloudy mornings. (The September daily minimum temperature had been higher: 9.7° in 2002, and 8.2° in 2010.)
The total rainfall of 19.4 mm is half the average of 41.2 mm. It is in the 28th percentile. The two and three month totals are now serious shortages, in the 6th percentile. The 24 month total (1508 mm) and 36 month total (2231 mm) are still very high.


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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