July 2008: more cloud, less frost

The daily weather log

Weather log July 2008

With 52% cloudy mornings, this was the cloudiest July (and the fifth cloudiest month) in a decade.
There were no long warm or cold spells, so the seven-day mean temperature scarcely changed until the cooler final days. Yet each day’s temperatures were quite different from the day before. Wednesday the 9th was the 4th coldest day of the decade. It reached only 9.8°, and Monday the 28th, at 11.3°, was not much warmer.
Five nights were warmer than 8°. They were separated by cold nights, but there were only fourteen frosts, the coldest, on the 12th, being 2.7°. Widespread fog on the 15th did not lift until 11 am, and there was thick fog in the valley on the 26th.
Eight rain days were scattered through the month. The wettest day had 9.4 mm, and the total was 33 mm.

 Comparing July months

Climate July 2008

The mean daily maximum and daily mean temperatures for the month were normal but, on the average, nights were warm. As a result, the mean daily temperature range, 13.6°, was the narrowest in ten July months. Sunny, frosty, droughty July 2002 had a range of 18.5°: more than 30% wider! (The month with the narrowest mean temperature range for the decade was June 2007, with 10.9°. That was also the cloudiest month.)

July usually has about 17 frosts. This month’s total of 14 made it the least frosty July this century. July 1999 had only 13 frosts, with none below -2°.
Humidity (early morning dew point) was normal for the time of year.
The rainfall total is not far below the average: 33 mm is in the 46th percentile for July. The total for this June and July together (98 mm) is better than usual: in the 52nd percentile of two-monthly totals. Not so good are the three-monthly total (112 mm) in the 30th percentile and the four-monthly total (132 mm) in the 20th percentile. Worse, the five-month total (134 mm) is only in the 8th percentile, due to the 2 mm rainfall of March. The six-month total is much better (in the 29th percentile). Rainfall totals for longer periods are normal.

Data. Rainfall data is from Manilla Post Office, courtesy of Phil Pinch. Dew point values before August 2005 are from Tamworth Airport 6 am data supplied by the Bureau of Meteorology. Temperature and other data are from 3 Monash Street, Manilla.


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