Monthly Archives: March 2009

Normal Climate in Summer 2008-09

Posted in Manilla NSW, Season Weather by

 

Weather log summer 2008-09

For most of the summer, 7-day average temperatures got steadily warmer. From 4° below normal in mid-December they rose to 4° above normal in early February. They then crashed to 5° below normal before recovering. Two days exceeded 40°: February 6th (40.1°) and February 9th (40.9°). In ten summers, 19 days have exceeded 40°, the hottest being 42.0° on 21/2/04.
This season had the coldest summer day so far this century: February 14th 2009, with 17.8°. That is 15.3° below normal (it would be normal in winter, not summer)!

NOTE. This is the daily maximum reading that is furthest below normal in the ten-year record from March 1999. There have been only 23 days when the maximum was more than 10° below normal. Only 18 days were more than 8° above normal. The furthest above normal (by 10.5°) was the reading of 38.8° on November 10th 2002.

Humidity was low both in the early cool spell and in the later hot spell. At both times the daily range of temperature was high (17°) and the skies mainly clear.
There were 23 rain days, which is normal and far fewer than the 33 rain days last summer. Dry spells (with falls less than 1 mm) were long: 21 days from the 30th of December, and 16 days from the 25th of January. February the 15th was the wettest day, with 51.2 mm, and the summer total was 228 mm.
The number of overcast mornings (12) was normal for summer, but the number of cloud-free mornings (17) was very low, as it was last summer (13).

All mean temperatures (daily maximum, mean, and minimum) were normal this summer. They were much higher than last summer, with the daily maximum a remarkable 2.8° higher. The mean morning Dew Point was also normal.

The total rainfall of 228 mm is very close to the long-term summer average of 227 mm. It is on the 54th percentile.
At 38% cloudy mornings, this summer was cloudy, but not extremely cloudy like last summer (53%).
The summers of 05-06 and 07-08 were both very wet (319 mm and 311 mm). They differed in other ways: summer 05-06 was hot, humid and not cloudy; summer 07-08 was cold, not humid, and extremely cloudy.

Climate for summer 2008-09

 

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

February 2009: swelter and shiver

Posted in Manilla NSW, Monthly weather by

The daily weather log

Weather log February 2009

February days began hot (37.8°), and got hotter. The 9th reached 40.9°: that was 7.5° above normal, and the hottest day of the summer. At 20°, nights were unpleasantly warm, but it is normal for the first week of February to have the hottest nights of the year (18.4°).
The daily maximum on the 14th was an amazingly cool 17.8°, that is, 23.1° lower than five days before! The reading was 15.2° below normal. On that day, half of NSW, excluding only the borders on the east, south and west, had daily maximum temperatures more than 12° below normal.
A wet spell from the 11th to the 17th brought most of the month’s rain.At Manilla the highest reading was 51.2 mm on the 15th.
The month ended dry, with temperatures normal, except that nights became cool.

 Comparing February months

Climate February 2009

This month’s climate was normal, if rather wet. Other Februaries on the graph vary in every way:

February 2005 was sunny, dry, and not humid;
February 2006 was hot and humid;
February 2007 was very rainy;
February 2008 was very cloudy and very cold.
The rainfall total (94.5 mm) was in the 75th percentile for the month; well above the February average of 67 mm. This neatly makes up the January shortfall. Rainfall totals for groups of months remain very high. The 6 month total (525 mm) is in the 92nd percentile, and more than 200 mm above the median value. Totals are still above the median for all periods up to 72 months, with the exception of the 36-month total, and that has now risen to the 46th percentile.

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.