With a high of 33.8°C at the airport yesterday, it was Winnipeg's hottest September day in 30 years, since a high of 38.8°C on September 2, 1983 (that day also happens to be Winnipeg's hottest September day ever). However, we did not break a daily high record yesterday, which stands at 34.4°C in in 1976.
However, there is one record we broke yesterday. With a minimum of 17.9°C, that breaks the old record high minimum of 17.2°C in 1967. This is the 3rd daily high minimum record Winnipeg has broken in the last 2 weeks. This reflects the unusually high humidity for so late in the year we have seen this year.
Speaking of humidity, it was surely quite humid yesterday. With a max hourly dewpoint observation of 20.3°C, that was the highest dewpoint in September since a reading of 21.8°C on Sep 5, 2005. It is also only the 30th occurence of dewpoint over 20°C in September since 1953. The highest ever in September was 23.4°C on Sep 2, 1983.
In addition, humidex reached 40.4 yesterday. This is only the 4th occurence of humidex over 40 in September since 1953. In addition, it is the also the 4th highest humidex in September... and latest occurrence of humidex over 40 ever.
Highest humidex values in September since 1953...
1. 45.9 on Sep 2, 1983
2. 41.4 on Sep 5, 1978
3. 41.2 on Sep 2, 1960
4. 40.4 on Sep 6, 2013
5. 39.2 on Sep 10, 1998
Thunderstorms sparked along a cold front just east of Winnipeg yesterday late afternoon and evening. I chased the storm with Matt from A Weather Moment... because who knows, this may be the last chase of the year. Here's a couple photos below. Not the best storm we've ever chased, that's for sure.. but not bad for September.