Tuesday, September 26, 2017

Record breaking September heatwave for Ontario & Quebec

The hot and humid weather in eastern Canada established over 60 new record highs on Monday, September 25.
Just how hot was September 25th in Ontario and Quebec? Between the two provinces, over 60 new high temperature records were established. Montreal reached 31.5C (88F), the second warmest day of the entire year. This temperature was also the warmest fall temperature ever recorded in the city. Monday also marked the 17th consecutive day with no precipitation. On Tuesday, Montreal established another high temperature record at 29.1C, the old record was 26.5C set in 2007. This marks three consecutive days, and we will likely break another record Wednesday before cooler weather arrives. In addition to the record high temperatures, the humidex reading of 40C on Monday, was the latest in the season such a reading has been observed. This broke the record established just the previous day. Montreal also set new high/low temperature records with 20.6C overnight Sunday. This value smashed the previous record of 17.2C set in 1958. Heat warnings remain in effect for southern and eastern Ontario as well as southern Quebec.  The hot weather has also spread into Atlantic Canada. Late Tuesday afternoon, CFB Gagetown was the warmest location in the country at 33C (91F).

All this summer heat and humidity will come to an end late Wednesday and Thursday as a cold front arrives. Scattered showers and thunderstorms are possible along with temperatures returning to normal values for late September. In Montreal, that would be 17C (63F) for daytime highs and 7C (45F) for morning lows.

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