Longueuil climate — normals and trends
Longueuil (Canada) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 6.7 °C and it receives 1,081 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (21.3 °C on average) and the coldest is January (-9.6 °C). Rainfall peaks in July.
Longueuil averages 146 frost days, 9 hot days (≥ 30 °C) and 138 rainy days per year.
Longueuil has warmed by +1.7 °C between 1940 and 2025, or +0.20 °C per decade. This trend is statistically significant.
The number of frost days there went from about 155 to 137 per year over the period.
The hottest day of the period reached 36.2 °C (on 27 May 2020) and the coldest -36.3 °C (on 15 January 1957).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
LongueuilQuebec
- coords
- 45.52°, -73.47°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
6.7°C
Average daily high
11.2°C
Average daily low
2.1°C
Annual rainfall
1,081mm
Sunshine / day
8.5h
Mean relative humidity
72%
Average peak wind
18.7km/h
Seasonal range
30.9°C
Frost days (< 0 °C)
146 d/yr
Hot days (≥ 30 °C)
9 d/yr
Rainy days (≥ 1 mm)
138 d/yr
Annual snowfall
149.4 cm
Average feels-like high
8.6 °C
Average feels-like low
-1.2 °C
Average peak gust
36.9 km/h
Tropical nights (≥ 20 °C)
9 d/yr
Solar radiation
13.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.7 °C
since 1940
+0.2 °C per decade · r² = 0.34 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
36.2 °C
27 May 2020
Coldest day
-36.3 °C
15 January 1957
Wettest day
106 mm
9 August 2024
Windiest day
57.6 km/h
25 February 1956
Strongest gust
113.4 km/h
27 January 1996
Hottest feels-like
41.3 °C
1 August 1975
Coldest feels-like
-42.1 °C
15 January 1957
Snowiest day
32.8 cm
30 November 1944
Sunniest day
15.5 h
20 June 1952
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | -5.2 °C | +0.3 °C | 46 mm | -23 mm |
| Feb | -4.8 °C | -1.0 °C | 82 mm | +16 mm |
| Mar | 5.0 °C | +2.6 °C | 90 mm | +15 mm |
| Apr | 12.0 °C | +1.1 °C | 102 mm | +7 mm |
| May | 18.7 °C | -0.1 °C | 112 mm | +18 mm |
| Jun | 25.2 °C | +1.5 °C | 91 mm | -12 mm |
| Jul | 27.4 °C | +1.3 °C | 86 mm | -16 mm |
| Aug | 26.0 °C | +1.2 °C | 62 mm | -39 mm |
| Sep | 22.3 °C | +2.1 °C | 54 mm | -45 mm |
| Oct | 15.8 °C | +2.5 °C | 145 mm | +46 mm |
| Nov | 3.6 °C | -1.9 °C | 112 mm | +19 mm |
| Dec | -3.5 °C | -1.2 °C | 76 mm | -9 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Longueuil?
Longueuil has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 6.7 °C and it receives 1,081 mm of precipitation per year.
What is the hottest day ever recorded in Longueuil?
The hottest day measured in Longueuil between 1940 and 2025 was 27 May 2020, reaching 36.2 °C.
What is the coldest day in Longueuil?
The coldest day measured in Longueuil between 1940 and 2025 was 15 January 1957, at -36.3 °C.
Does it snow in Longueuil?
Yes. Longueuil gets on average 149.4 cm of snow per year and has around 146 frost days.
Has the climate of Longueuil warmed?
Yes: Longueuil warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Longueuil?
The wettest day measured in Longueuil between 1940 and 2025 was 9 August 2024, with 106 mm of rain in 24 hours.
What was the windiest day in Longueuil?
The windiest day measured in Longueuil between 1940 and 2025 was 25 February 1956, with winds reaching 57.6 km/h.
What is the warmest month in Longueuil?
The warmest month in Longueuil is July (21.3 °C on average); the coldest is January (-9.6 °C).
How much does it rain in Longueuil?
Longueuil receives on average 1,081 mm of precipitation per year, spread over about 138 rainy days.
Is it sunny in Longueuil?
Longueuil gets on average 8.5 hours of sunshine per day, roughly 3,103 hours per year over 1940-2025.
What is the biggest single-day snowfall in Longueuil?
The heaviest 24-hour snowfall measured in Longueuil between 1940 and 2025 was 30 November 1944, with 32.8 cm.
Are there tropical nights in Longueuil?
Yes: Longueuil has on average 9 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Longueuil?
In Longueuil, between 1940 and 2025, the highest apparent temperature reached 41.3 °C on 1 August 1975, and the lowest was -42.1 °C on 15 January 1957.
Compare Longueuil with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Longueuil