Tuesday, 4 December 2012

Fall 2012

Fall stats (Sep-Oct-Nov). CLICK to enlarge
     This Fall was a bit of a transition period; going from more than a year of warmer than normal months to colder than normal weather. It was the first colder than normal season since the Spring of 2011. With an average mean temperature of 3.5°C, it was also the coldest Fall in a decade, going back to 2002 when the average mean was 2.6°C.

     There were certainly a few notable cold events. A low of -25.5°C in late November was the coldest November low since 2007. In addition, the high temperature was a measly 4.9°C making it the coldest November maximum in almost two decades, going back to 1995. It was the first colder than normal November since 2003.

     October featured some early snowfall as a major Colorado Low dumped up to 30 cm on the 4th and 5th over southeastern Manitoba. It cut power to thousands. Winnipeg dodged the worst with just a couple cm, but it was the earliest accumulative snowfall since 1996.

Sep 30... 24°C
     September was near normal on average, but that does not tell the whole story. With 7 nights of freezing temperatures (below 0°C), it was the most in 3 decades, since 1984, and tied for 3rd most. A low of -7.1°C on the 23rd was the coldest in September in half a century, and the 5th coldest on record for the month. September wasn't all that bad however. There were brief glimpses of summer as temperatures on a few occasions approached 30°C. This included the last 2 days of the month, which featured near record-warmth. The heat coincided with the change of colours of the leaves making for a wonderful end to the month.

     As for precipitation, Fall also marked a transition period. October marked the first wetter than normal month since May, thanks to significant rainfall. The rain in October was much welcomed after the second driest September on record with just 4 mm of rainfall.

     November continued the new trend with snowier than normal weather; about 40 cm of the white stuff. This was mainly due to a significant snowstorm on the 10th and 11th which dumped between 20 and 25 cm over Winnipeg, with higher amounts to the west and north, as high as 65 cm in Mafeking and 37 cm in Portage.

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