Grimsby climate — normals and trends
Grimsby (Canada) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 9.0 °C and it receives 926 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 (21.9 °C on average) and the coldest is February (-3.7 °C). Rainfall peaks in April.
Grimsby averages 101 frost days, 1 hot days (≥ 30 °C) and 128 rainy days per year.
Grimsby has warmed by +1.5 °C between 1940 and 2025, or +0.17 °C per decade. This trend is statistically significant.
The number of frost days there went from about 115 to 87 per year over the period.
The hottest day of the period reached 32.8 °C (on 8 July 1988) and the coldest -24.5 °C (on 17 January 1982).
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
GrimsbyOntario
- coords
- 43.20°, -79.57°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.0°C
Average daily high
11.8°C
Average daily low
6.3°C
Annual rainfall
926mm
Sunshine / day
8.7h
Mean relative humidity
74%
Average peak wind
22.1km/h
Seasonal range
25.6°C
Frost days (< 0 °C)
101 d/yr
Hot days (≥ 30 °C)
1 d/yr
Rainy days (≥ 1 mm)
128 d/yr
Annual snowfall
94.3 cm
Average feels-like high
9.4 °C
Average feels-like low
3.0 °C
Average peak gust
38.1 km/h
Tropical nights (≥ 20 °C)
29 d/yr
Solar radiation
14.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.5 °C
since 1940
+0.2 °C per decade · r² = 0.25 · 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
32.8 °C
8 July 1988
Coldest day
-24.5 °C
17 January 1982
Wettest day
97 mm
15 October 1954
Windiest day
61.1 km/h
26 January 1978
Strongest gust
106.6 km/h
26 January 1978
Hottest feels-like
37.5 °C
6 July 2012
Coldest feels-like
-32.8 °C
17 January 1982
Snowiest day
30.5 cm
7 February 1942
Sunniest day
14.9 h
6 July 2025
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 | -1.2 °C | -0.5 °C | 35 mm | -34 mm |
| Feb | -0.6 °C | 0.0 °C | 80 mm | +17 mm |
| Mar | 6.3 °C | +3.2 °C | 78 mm | -1 mm |
| Apr | 9.5 °C | +0.7 °C | 64 mm | -25 mm |
| May | 14.0 °C | -0.7 °C | 116 mm | +34 mm |
| Jun | 21.4 °C | +0.5 °C | 46 mm | -32 mm |
| Jul | 26.1 °C | +1.4 °C | 44 mm | -31 mm |
| Aug | 24.2 °C | -0.1 °C | 60 mm | -11 mm |
| Sep | 21.3 °C | +0.6 °C | 27 mm | -53 mm |
| Oct | 15.7 °C | +1.2 °C | 66 mm | -15 mm |
| Nov | 7.7 °C | -0.5 °C | 59 mm | -24 mm |
| Dec | 1.7 °C | -0.8 °C | 86 mm | +8 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 Grimsby?
Grimsby has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 9.0 °C and it receives 926 mm of precipitation per year.
What is the hottest day ever recorded in Grimsby?
The hottest day measured in Grimsby between 1940 and 2025 was 8 July 1988, reaching 32.8 °C.
What is the coldest day in Grimsby?
The coldest day measured in Grimsby between 1940 and 2025 was 17 January 1982, at -24.5 °C.
Does it snow in Grimsby?
Yes. Grimsby gets on average 94.3 cm of snow per year and has around 101 frost days.
Has the climate of Grimsby warmed?
Yes: Grimsby warmed by +1.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Grimsby?
The wettest day measured in Grimsby between 1940 and 2025 was 15 October 1954, with 97 mm of rain in 24 hours.
What was the windiest day in Grimsby?
The windiest day measured in Grimsby between 1940 and 2025 was 26 January 1978, with winds reaching 61.1 km/h.
What is the warmest month in Grimsby?
The warmest month in Grimsby is July (21.9 °C on average); the coldest is February (-3.7 °C).
How much does it rain in Grimsby?
Grimsby receives on average 926 mm of precipitation per year, spread over about 128 rainy days.
Is it sunny in Grimsby?
Grimsby gets on average 8.7 hours of sunshine per day, roughly 3,175 hours per year over 1940-2025.
What is the biggest single-day snowfall in Grimsby?
The heaviest 24-hour snowfall measured in Grimsby between 1940 and 2025 was 7 February 1942, with 30.5 cm.
Are there tropical nights in Grimsby?
Yes: Grimsby has on average 29 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Grimsby?
In Grimsby, between 1940 and 2025, the highest apparent temperature reached 37.5 °C on 6 July 2012, and the lowest was -32.8 °C on 17 January 1982.
Compare Grimsby with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Grimsby