Lethbridge climate — normals and trends
Lethbridge (Canada) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 6.4 °C and it receives 415 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 (19.5 °C on average) and the coldest is January (-6.7 °C). Rainfall peaks in June.
Lethbridge averages 149 frost days, 17 hot days (≥ 30 °C) and 82 rainy days per year.
Lethbridge has warmed by +0.8 °C between 1940 and 2025, or +0.10 °C per decade. This trend is statistically significant.
The hottest day of the period reached 39.6 °C (on 10 August 2018) and the coldest -42.8 °C (on 12 January 2024).
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
LethbridgeAlberta
- coords
- 49.70°, -112.82°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
6.4°C
Average daily high
12.0°C
Average daily low
0.9°C
Annual rainfall
415mm
Sunshine / day
9.7h
Mean relative humidity
60%
Average peak wind
18.4km/h
Seasonal range
26.2°C
Frost days (< 0 °C)
149 d/yr
Hot days (≥ 30 °C)
17 d/yr
Rainy days (≥ 1 mm)
82 d/yr
Annual snowfall
87.3 cm
Average feels-like high
8.5 °C
Average feels-like low
-3.0 °C
Average peak gust
38.6 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
14.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+0.8 °C
since 1940
+0.1 °C per decade · r² = 0.05 · p = 0.033
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
39.6 °C
10 August 2018
Coldest day
-42.8 °C
12 January 2024
Wettest day
76 mm
22 June 1963
Windiest day
54.6 km/h
10 December 1956
Strongest gust
116.6 km/h
16 October 1991
Hottest feels-like
37.5 °C
5 August 1961
Coldest feels-like
-48.4 °C
12 January 2024
Snowiest day
28.0 cm
22 May 2002
Sunniest day
15.7 h
20 June 1941
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 0.2 °C | +2.3 °C | 20 mm | +3 mm |
| Feb | -6.8 °C | -7.4 °C | 16 mm | -1 mm |
| Mar | 7.7 °C | +2.6 °C | 11 mm | -14 mm |
| Apr | 14.0 °C | +2.0 °C | 37 mm | -3 mm |
| May | 22.1 °C | +4.2 °C | 40 mm | -20 mm |
| Jun | 23.4 °C | +1.7 °C | 99 mm | +22 mm |
| Jul | 23.9 °C | -2.4 °C | 84 mm | +48 mm |
| Aug | 26.4 °C | +0.9 °C | 37 mm | -0 mm |
| Sep | 25.3 °C | +5.4 °C | 13 mm | -26 mm |
| Oct | 13.8 °C | +0.6 °C | 24 mm | -2 mm |
| Nov | 7.8 °C | +3.3 °C | 28 mm | +6 mm |
| Dec | 1.8 °C | +2.1 °C | 37 mm | +19 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 Lethbridge?
Lethbridge has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 6.4 °C and it receives 415 mm of precipitation per year.
What is the hottest day ever recorded in Lethbridge?
The hottest day measured in Lethbridge between 1940 and 2025 was 10 August 2018, reaching 39.6 °C.
What is the coldest day in Lethbridge?
The coldest day measured in Lethbridge between 1940 and 2025 was 12 January 2024, at -42.8 °C.
Does it snow in Lethbridge?
Yes. Lethbridge gets on average 87.3 cm of snow per year and has around 149 frost days.
Has the climate of Lethbridge warmed?
Yes: Lethbridge warmed by +0.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Lethbridge?
The wettest day measured in Lethbridge between 1940 and 2025 was 22 June 1963, with 76 mm of rain in 24 hours.
What was the windiest day in Lethbridge?
The windiest day measured in Lethbridge between 1940 and 2025 was 10 December 1956, with winds reaching 54.6 km/h.
What is the warmest month in Lethbridge?
The warmest month in Lethbridge is July (19.5 °C on average); the coldest is January (-6.7 °C).
How much does it rain in Lethbridge?
Lethbridge receives on average 415 mm of precipitation per year, spread over about 82 rainy days.
Is it sunny in Lethbridge?
Lethbridge gets on average 9.7 hours of sunshine per day, roughly 3,540 hours per year over 1940-2025.
What is the biggest single-day snowfall in Lethbridge?
The heaviest 24-hour snowfall measured in Lethbridge between 1940 and 2025 was 22 May 2002, with 28.0 cm.
Are there tropical nights in Lethbridge?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Lethbridge.
What was the most extreme apparent temperature in Lethbridge?
In Lethbridge, between 1940 and 2025, the highest apparent temperature reached 37.5 °C on 5 August 1961, and the lowest was -48.4 °C on 12 January 2024.
Compare Lethbridge with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Lethbridge