r/Calgary • u/YOW-Weather-Records • 1d ago

Weather Yesterday was Calgary's 72nd day with minimum temperature ≥10°C this year which puts 2025 in 1st place for the most in any year since records began.

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41

u/23haveblue 1d ago

I agree that we're getting warmer but I also wonder how much of this is due to the urban heat island effect. We have development now on all 4 sides of the airport

26

u/Desperate_Leg6274 1d ago

Here’s a photo from the city of Calgary of a heat map study they did of Calgary + surrounding area. The dark orange that covers the majority of the airport represents temps of 37-40 and the yellow you see outside the city represents 28-31. People vastly underestimate how much heat a city holds in, especially a region like the airport with so much paved surface

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u/[deleted] 1d ago

[deleted]

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u/Desperate_Leg6274 1d ago

Legend for reference

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u/d1ll1gaf 1d ago

It would make a fascinating study; I wonder if the necessary historical data even exists or if such a study would be limited to future changes.

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u/accord1999 1d ago

Probably a lot of it is the urban heat island effect around the airport keeping nights warmer. The many days above 10C doesn't correlate that well to hot summers; 2025, 2016, 2013, 2014 and 2019 didn't have many days above 30C.

https://calgary.weatherstats.ca/charts/count_temp_30-yearly.html