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chris - sᴉɹɥɔ @yegwxnerdery.bsky.social · 1d

...for 4-day temperatures 2025 was right on average.
public.tableau.com/shared/F6R2W...

chris - sᴉɹɥɔ @yegwxnerdery.bsky.social · 1d

For Thanksgiving our average High is 12°C, and average Low is 1.1°C.
For 2025 the Friday & Saturday were above average, and the Sunday & Monday were below.
Recently 2022 & 2023 were pretty warm, and 2016 & 2009 were our recent cold ones.
#yegwx #yeg
public.tableau.com/shared/6TNR8...

Thanksgiving temperature history since 1995

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chris - sᴉɹɥɔ @yegwxnerdery.bsky.social · 1d

bsky.app/profile/yegw...

chris - sᴉɹɥɔ @yegwxnerdery.bsky.social · 1d

..."lasting" snow is a bit different.
In both cities early snow usually melts off quickly.
It usually doesn't start to hang around until the beginning of November (and then Calgary gets big melts throughout the winter)
public.tableau.com/shared/J3YR2...

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chris - sᴉɹɥɔ @yegwxnerdery.bsky.social · 1d

..."lasting" snow is a bit different.
In both cities early snow usually melts off quickly.
It usually doesn't start to hang around until the beginning of November (and then Calgary gets big melts throughout the winter)
public.tableau.com/shared/J3YR2...

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chris - sᴉɹɥɔ @yegwxnerdery.bsky.social · 1d

...mid-October has historically been fairly typical for the first snow for Edmonton and Calgary.
public.tableau.com/shared/28TPC...

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chris - sᴉɹɥɔ @yegwxnerdery.bsky.social · 1d

No official snow at the Edmonton airport yesterday, but Calgary did record 1cm. #yeg #yegwx #yyc #yycweather
This is Calgary's earliest snow since 2021.
The last time that they got a really early September snow was 2019, and 2018 for us.
public.tableau.com/shared/NWRWN...

Bubbles show pre-january snowfall history for Edmonton and Calgary back to 2010.

Bubbles show pre-january snowfall history for Edmonton and Calgary back to 2010, with early snowfalls highlighted.

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chris - sᴉɹɥɔ @yegwxnerdery.bsky.social · 9d

...Edmonton normally has a longer growing season than the other prairie cities.
Regina's first fall frost was September 6th (1 wk early) and Saskatoon's was September 25th (1 wk late).
Calgary's will be October 5th (2 wks late).
And so far Winnipeg is frost-free.
public.tableau.com/shared/4HYJX...

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chris - sᴉɹɥɔ @yegwxnerdery.bsky.social · 9d

...around town, Stony Plain didn't drop below freezing last night, so its first fall frost will be October 5th.
The airport's was back on September 25th, about 2 weeks late.
Campsie's (100km NW) was on September 5th, which is right on their average.
public.tableau.com/shared/XXX99...

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chris - sᴉɹɥɔ @yegwxnerdery.bsky.social · 9d

...2025's final spring frost on May 16th was a bit later than the average of May 5th.
With the October 4th fall frost that makes a total of 140 frost-free days, below our average of 146.
Recently 2024 went 174 days, and 2023 went 182 (2nd most on record).
public.tableau.com/shared/3SZ5R...

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chris - sᴉɹɥɔ @yegwxnerdery.bsky.social · 9d

Edmonton's first fall frost of 2025 was October 4th.
The average is September 29th, so this was just a bit late.
Recently we had the two latest fall frosts on record, with October 22nd in 2023 and 23nd in 2022.
(2024 was fairly late on the 12th).
#yegwx #yeg
public.tableau.com/shared/TNJQM...

history of frosts for edmonton with 2025, 2023 & 2022 highlighted

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chris - sᴉɹɥɔ @yegwxnerdery.bsky.social · 13d

Quite a few months have something similar, but for January the scale it is just massive, with a ~10°C shift since the mid-70s.
public.tableau.com/shared/BMB65...

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chris - sᴉɹɥɔ @yegwxnerdery.bsky.social · 14d

...and that brings us to the end of our look back at September 2025 weather in Edmonton.
All of these charts are interactive dashboards with data for 17 Canadian cities, accessible at:
edmontonweathernerdery.blogspot.com/2025/09/sept...

September 2025 Review

Weather history for Edmonton Alberta, from a year-round active-commuter. Trends and records for the northernmost city of 1M people in North America.

edmontonweathernerdery.blogspot.com

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chris - sᴉɹɥɔ @yegwxnerdery.bsky.social · 14d

...for October, we average about 1~2 Highs of 20°C, but half of the time there are none.
October also averages 2 Highs below 0°C, and 14 freezing Lows.
And...7cm of snow on average, although 2021, 2022 & 2024 had none.
public.tableau.com/shared/SKFQW...

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chris - sᴉɹɥɔ @yegwxnerdery.bsky.social · 14d

...across the country the biggest September storms were:
50mm in Regina
38mm & 23mm in Toronto
25mm in Quebec City
20mm in Charlottetown
public.tableau.com/shared/JWDZR...

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chris - sᴉɹɥɔ @yegwxnerdery.bsky.social · 14d

...these are the precipitation totals for 2025 across the country.
Quebec City is still way out ahead with over 865mm.
Montréal & St. John's are over 700mm.
And like Edmonton, Calgary recorded basically no precipitation (0.4mm) in September.
public.tableau.com/shared/96J5H...

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chris - sᴉɹɥɔ @yegwxnerdery.bsky.social · 14d

...on the other hand, no September precipitation also means no September snow.
The last time that we recorded September snow was September 28, 2019 in Stony Plain.
And September 2018 was also very snowy.
public.tableau.com/shared/7YT6P...

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chris - sᴉɹɥɔ @yegwxnerdery.bsky.social · 14d

...Storms? What storms?
By September our big summer storm season is over, but we still average around 10 days with Precipitation.
But not in 2025.
public.tableau.com/shared/9ZQY7...

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chris - sᴉɹɥɔ @yegwxnerdery.bsky.social · 14d

...by the end of September we average around 377mm of precipitation for the year.
The dry September means that Campsie and the airport are a bit below average around 350mm.
But Stony Plain is way down at 267mm, and Blatchford is down at 250mm.
public.tableau.com/views/Edmont...

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chris - sᴉɹɥɔ @yegwxnerdery.bsky.social · 14d

...in September we average 32mm of precipitation, and 2025 was SUPER low.
The airport recorded 0.6mm, Blatchford got to 0.9mm, and Stony Plain had 1.5mm.
Campsie (100km NW) got up to 13.3mm, but that's still well below average.
public.tableau.com/shared/SP8W9...

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chris - sᴉɹɥɔ @yegwxnerdery.bsky.social · 14d

...September 2025 another above-average month across the country.
Edmonton was at the top at 6.9°C warmer than the 20th century average. Victoria was at the bottom, at 0.4°C warmer than theirs.
public.tableau.com/shared/4F7J6...

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chris - sᴉɹɥɔ @yegwxnerdery.bsky.social · 14d

...September 2025 was well above average, so it's a big orange bubble here.
The average High of 23.8°C was 6.9°C warmer than the 20th century average.
The average Low of 8.8°C was 4.2°C warmer.
public.tableau.com/shared/FMGG6...

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chris - sᴉɹɥɔ @yegwxnerdery.bsky.social · 14d

...with 3 months left in 2025, its average temperature is currently our 5th warmest overall, at 2.1°C above the 20th century average.
That's due to a warm January (#13), May(#6), August (#5), and September (#1).
The Highs are #4 warmest, and Lows are #9.
public.tableau.com/shared/WN773...

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chris - sᴉɹɥɔ @yegwxnerdery.bsky.social · 14d

...around town, the airport did get its first frost on September 25th, which is about 2 weeks later than its average.
And Campsie's September 5th frost was right on its average.
public.tableau.com/shared/ZW526...

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chris - sᴉɹɥɔ @yegwxnerdery.bsky.social · 14d

...this shows Blatchford's history of early frosts, counting the 0°C Lows which occurred each year before October.
Right now we've gone 6 years without a September frost. The longest gap on record was 7 years from 1975-1981.
public.tableau.com/shared/MSJXT...

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chris - sᴉɹɥɔ @yegwxnerdery.bsky.social · 14d

...so far 2025 has set 8 new daily record Highs. That's below 2024's 11, but above the 5 from 2021-2023.
And 2025 has 6 record warmest-Lows. That's more than a lot of years, but 2021-2024 all ranged from 10-15.
public.tableau.com/shared/GS3XT...

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