September 2010 was unusual because of a heat wave at the start and heavy amounts of rain throughout the month.
The summer’s only “official” heat wave took place from the 1st to the 3rd with daytime highs at 32 C or higher.
Temperatures did drop to near normal values after the heat wave only to rebound again by month end.
High amounts of precipitation can be traced to the remnants of Hurricane Earl on the 4th but other major events on the 10th, 15th and 17th brought even higher amounts of rain.
SEPTEMBER 2010 ALMANAC
Average HIGH 19.8 C
Average LOW 10.5 C
AVERAGE 15.2 (2.2 degrees above the 30-year average)
Extreme HIGH 34.1 C (1st, new record high for the date and September)
Extreme LOW 2.3 C (27th)
RAINFALL 159.0 mm (almost 60 percent above the 30-year average)