Wednesday, September 30, 2009
September 2009 was a summer-like month with plenty of sunny warm days, and only 4 days with measurable rain. The stretch between the 13th and 25th was especially nice, dominated by sunshine and 25-30C temperatures that was interrupted only one day with cloudy skies and a brief shower over the two week period. The month finished with an average temperature higher than any month of the year, the first time in Winnipeg’s climate history that September was the warmest month of the year. Every day from the 1st to the 27th was above normal with 19 of those days reaching a temperature of 25C or higher, the most 25C days of any September (previous record 16 days in 1940) and nearly twice as many as July had (10 days) Amazingly, no daily record highs were established during the month, highlighting the fact that it was the persistence of the warm weather that was the story, rather than any extreme heat. This was evident with the night-time lows, with no lows below 10C until the 22nd. A cool snap at the end of the month produced the season’s first frost on the 29th with a low of -2.4C at Winnipeg airport. Downtown however remained frost free all month.
Precipitation at the airport totaled 22 mm, less than half the average September monthly precipitation of 58 mm. Of the 22mm total, only 1 mm fell after the 11th. The sunny dry warm weather was a blessing for area farmers who needed an extended period of warm dry weather to make up for a slow growing season delayed by cool temperatures and rainfall. As a result, many crops were able to mature before the late frost, and be harvested in fine sunny conditions. The weather was also a boon to local beaches and golf courses, making up for some lost ground from a cool wet summer.
Overall, a September to remember! (see NCDC September summary for more info)
Tuesday, September 29, 2009
At Winnipeg airport, the average date of the first fall frost is Sept 22nd so today's frost was a week later than "normal", although the first fall frost date varies quite a bit from year to year. Average date for the last frost in spring is May 23rd which gives an average growing season of about 121 days using airport data. Last year, the airport had a 116 day growing season (Jun 3rd - Sept 26th), virtually the same as this year.
Within the city of Winnipeg however, frost was not widespread this morning. The Forks downtown had a low of +1.4C, and in Charleswood, my station registered a low of +0.5C with just some some light frost noted. Downtown Winnipeg has a much longer growing season than the airport, due to the urban heat island effect that keeps night time temperatures warmer than rural areas. The average first fall frost downtown is Oct 5th, while the last spring frost is May 4th giving an average growing season of 159 days downtown, or 38 days longer than the airport. For most areas of the city, the length of the growing season lies somewhere between downtown and airport values.
Monday, September 28, 2009
Friday, September 25, 2009
Wednesday, September 23, 2009
The warm weather has been persistent for the past 3 weeks over southern MB with every day this month above normal so far. But changes are on the way. A storm system is expected to cross southern MB Sunday, which will draw in much cooler air Sunday into Monday on strong northwest winds. This will bring the first spell of below normal temperatures in over 3 weeks, with the risk of a widespread frost by Tuesday morning. The cool outbreak however should not be enough to offset this September finishing as the warmest September on record in Winnipeg as well as most of southern MB.
Tuesday, September 22, 2009
Sunday, September 20, 2009
Friday, September 18, 2009
It looks like Mother Nature is trying to make up for her abysmal performance this summer with a glorious stretch of sunny warm weather heading into the last official weekend of summer. Temperatures have been above 25C all week long with sunshine, and the warm weather will continue through the weekend before a cold front moves through late Sunday. Saturday will see temperatures rise to the 30 degree mark over much of southern MB, especially over western MB where temperatures of 32C are forecast. Sunday will continue to be warm, with gusty southerly winds pushing temperature into the mid 20s before clouds approach in the afternoon and evening ahead of the advancing cold front. This front will usher in occasional showers Sunday night into Monday with a return to more seasonable temperatures in the upper teens. However, long range models are now indicating that the cooler weather will be short lived as above normal temperatures are forecast to return by mid to late week. This virtually ensures that September 2009 will likely go down as the warmest September on record in
Monday, September 14, 2009
Friday, September 11, 2009
Thursday, September 10, 2009
Sunday, September 06, 2009
Friday, September 04, 2009
Tuesday, September 01, 2009
Looking at the 3 month temperature graph for the "summer" of 2009, one can see the only warmth was a 2 week stretch in June and a 4 day hot spell in mid August (the 33C reading on Aug 27th is erroneous) Cool weather dominated most of the summer, especially July which did not break the 30C mark.
August now marks the 9th consecutive month below normal in Winnipeg.. the longest such streak since another 9 month stretch between Dec 1949 and August 1950.
Top 10 Coolest summers in Winnipeg (records began 1873)
|YEAR||Jun||Jul||Aug||AVG (C) |
NORMALS 17.0C 19.5C 18.5C summer: 18.3C