Patrick Duplessis

Ayant suivi les mesures de radiation solaire ces derniers mois à YUL et à McTavish (McGill), on voit systématiquement une chute soudaine un peu avant le coucher du soleil en été à McGill (et pas à YUL). Ça semble être le mont Royal qui cache le soleil à la station, d'où la différence selon moi.

Eureka, Nunavut (NEK) hit -30.5°C in the past hour, making it the first -30° of the season in Canada, close to two weeks later than normal.
The average date of first -30° in Eureka for 1991-2020 is Oct 21.

Canada had a very warm October, except in BC with near to slightly below seasonal temperatures.
Record-warmest October for:
Cambridge Bay -2.5° (previously -2.9 in 2021/2023)
Churchill 4.7° (4.0 in 2021)
Kuujjuaq 5.4° (3.8 in 2021)
Nain 7.1° (5.3 in 2023)
Wabush 4.9° (4.8 in 2022)

More monthly heat records in Eastern Canada today. Close to 30°C in Nova Scotia once again!

Several October records were broken today in Ontario and Québec, up to 31.7° in Luskville, QC (new provincial October record)!

A few missed records:
Ottawa 29.9° (1.0° from record of 2023)
Quebec City 26.7° (1.6° from record of 1949)
Moosonee 29.0° (1.0° from record of 2023)

September 2025 was warmer than normal everywhere in Canada. The strongest anomalies were in the Prairies and territories, and it was the hottest September on record in Vancouver, Calgary and Edmonton.

August 2025 was slightly warmer than normal overall in Canada. The warmest anomalies were observed in the Yukon, NWT, and Prairies. Meanwhile a few cold anomalies stand out in SW Ontario and parts of Nunavut.

Alaska's summer (Jun-Aug) was slightly warmer and slightly wetter than the 1991-2020 normal. @alaskawx.bsky.social

It's a record for August (previously 21.1° in 1996), but there were a few warmer lows in the past in July. All-time warmest low is 23.3° on July 8, 1952.

Another all-time record was set today in Eastern Canada!
30.3° Havre-Saint-Pierre, QC (previously 30,0° 1987/07/14)

36.3° (prelim.) in Goose Bay: New August Labrador record!
Very impressive 35.7° in Cartwright, too! August record for the station. #NLwx

We've asked a friend who works there and he said that the station is currently standing over a paved area, so it is overheating the sensor. It's a temporary setup until they repair the real station further in the field. So not a reliable temperature unfortunately!

Even hotter than yesterday in Eastern Canada!
All-time records were set at several stations, and the all-time PEI record was shattered with 38.1° at Maple Plains!
36.7° in Badger, NL tied August record for NL and all-time record for the island. 38.6° in Miramichi is 0.8° below NB all-time record. ♨️

Correction: Sept-Îles actually reached 29.9°C.

And then the sea-breeze came to Marys Harbour... causing a 17°C drop in one hour (n/a = 15.2°)

Here are some of the very hot temperatures recorded today in Eastern Canada... Up to 37.6°C in Miramichi, NB!
A few monthly records tied/broken, and tomorrow could be hotter locally! #NBwx #meteoqc #NLwx

July 2025 was a mixed bag in #Canada. Generally hotter than normal in the east, but slightly cooler in many regions. Northern Nunavut had the coldest anomalies, between 1° and 2°C below the 1991-2020 average.

June 2025 was generally warmer than normal in Canada, although most stations were within 1° of their 1991-2020 normal. Atlantic Canada got the warmest anomalies, up to 3.5° above normal in St. John's, NL.

May 2025 was a bit of a mixed bag across Canada. Very warm in the Prairies and parts of the north. Very cool in Yukon and adjacent NWT, and cooler than normal in northern QC and southern ON.

April 2025 was generally warmer than normal across Canada, but cooler in parts of Quebec, Northern Ontario and Manitoba, and Southern Nunavut. The month was more notable for its strong temperature swings than its overall anomaly.

March 2025 was warmer than normal for most of #Canada, except for a region extending from the NWT to Labrador, which was colder than normal. The strongest anomalies were in Northern Nunavut; up to +6.5°C for Pond Inlet.

Meteorological winter 2025 was overall near normal for Southern QC and ON and most of the Maritimes, colder than normal in parts of the Prairies, and broadly much above normal in northern Canada.

February 2025 was colder than normal for most Canadians, up to more than 6° below the 1991-2020 average in Southern AB and SK. Meanwhile, record-warmest February for Resolute and Alert in the extreme north.

Dans les 5 derniers jours, #Montréal a subi deux tempêtes faisant partie des 30 bordées les plus abondantes depuis le début des données à l'aéroport. Celle de jeudi tombe au 28e rang, alors que celle de dimanche arrive 15e. #meteoqc

January 2025 was warm for most of Canada. Warmest on record for Kuujjuaq and Iqaluit with an almost +11°C anomaly. The month was colder than normal in Southern Ontario and SE BC, and near normal at the northernmost point.

December 2024 was very warm across much of Canada, especially in Northern QC. Slightly above normal in the Maritimes and Southern ON/QC. Slightly below normal near the Beaufort Sea coast.

Would be even smoother if the strange Montreal December record wasn't there. The date is listed as N/A (possibly 1949) and the value is higher than the listed all-time record.
Using ECCC hourly data (since 1953), I found 1049.1 hPa (Dec 21, 1983), which is now beaten by this event's 1050.2 hPa.

Ottawa Airport peaked at a 105.04 kPa sea-level pressure this morning, setting a new all-time record for highest pressure reading.
Previous was 105.00 kPa on Feb. 13, 1981.

December records are also broken today in much of eastern ON and western QC, including Montreal and Quebec City.

Très doux tôt ce matin dans l'est du Québec, et jusqu'en après-midi au Labrador.
14,1° à Cartwright: Température la plus haute jamais enregistrée au Labrador en décembre.
Au Québec: Jusqu'à 16,7° à Cap-Chat.
À Terre-Neuve: 18,1° à Daniel's Harbour!

Correction: Sept-Îles 11 cm

Neige reçue au Québec depuis hier matin.
Bilan final pour la majorité du sud/centre, bilan partiel dans l'est.
Beaucoup de variation à travers le Grand Montréal, avec 5 cm à l'aéroport et 13 cm au centre-ville.
Laurentides jusqu'à 30 cm, et plus de 30 cm dans Charlevoix et autour de Forestville.