Despite some significant cool downs mid month and again in the last few days of the month, September still managed to finish above normal. Although only 0.6°C above normal, it was the most above normal month since September last year.
This September continues the trend of warm Septembers in the Winnipeg area. This was the 16th warmer than normal September in the last 21 Septembers (since 1994). It's been 15 years since we've had a September that was at least 1.0°C below normal (last time was 1999). In that same period, 8 finished over 1.0°C ABOVE normal.
|The warmth coincided with the leaf colour change|
Thunderstorms were also a big story in September, especially early in the month. Only 4 thunderstorm days occurred at the airport, just above the normal of 3 days. However, more occurred in the south end where the bulk of the activity occurred. 6 thunderstorm days occurred here in South St Vital. Blinding downpours, crashing thunder and strong winds were the main stories with most of the storms. The late season burst in activity salvaged the generally quiet season we had in the summer.
So far, the airport has seen 23 thunderstorm days this year, the most since 2010. Tragically, this is on track to being yet another below normal year for t-storm activity as a result. The last time we had an above normal thunderstorm season was in 2007. Note there were more t-storm days in the southern part of the city this year with 25 days at my place so far. Thunderstorms can still occur in October, so these stats could still go up a bit if we're lucky. The 1981-2010 normal number of t-storm days in a year is about 26-27 days.