Clarence-Rockland climate — normals and trends
Clarence-Rockland (Canada) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 6.2 °C and it receives 1,007 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 (20.6 °C on average) and the coldest is January (-10.1 °C). Rainfall peaks in July.
Clarence-Rockland averages 153 frost days, 10 hot days (≥ 30 °C) and 135 rainy days per year.
Clarence-Rockland has warmed by +1.3 °C between 1940 and 2025, or +0.15 °C per decade. This trend is statistically significant.
The number of frost days there went from about 159 to 147 per year over the period.
The hottest day of the period reached 37.4 °C (on 20 July 1977) and the coldest -36.7 °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
Clarence-RocklandOntario
- coords
- 45.55°, -75.29°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
6.2°C
Average daily high
11.0°C
Average daily low
1.2°C
Annual rainfall
1,007mm
Sunshine / day
8.3h
Mean relative humidity
72%
Average peak wind
16.0km/h
Seasonal range
30.7°C
Frost days (< 0 °C)
153 d/yr
Hot days (≥ 30 °C)
10 d/yr
Rainy days (≥ 1 mm)
135 d/yr
Annual snowfall
150.7 cm
Average feels-like high
8.6 °C
Average feels-like low
-2.0 °C
Average peak gust
37.1 km/h
Tropical nights (≥ 20 °C)
5 d/yr
Solar radiation
13.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.3 °C
since 1940
+0.2 °C per decade · r² = 0.22 · 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
37.4 °C
20 July 1977
Coldest day
-36.7 °C
15 January 1957
Wettest day
89 mm
9 September 2004
Windiest day
44.6 km/h
25 November 1950
Strongest gust
109.4 km/h
13 November 1992
Hottest feels-like
41.4 °C
1 August 1975
Coldest feels-like
-41.9 °C
15 January 1957
Snowiest day
28.7 cm
3 April 1975
Sunniest day
15.5 h
14 June 1940
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 | +0.4 °C | 40 mm | -27 mm |
| Feb | -4.9 °C | -1.3 °C | 75 mm | +14 mm |
| Mar | 4.6 °C | +2.1 °C | 101 mm | +29 mm |
| Apr | 11.5 °C | +0.6 °C | 115 mm | +27 mm |
| May | 18.8 °C | +0.1 °C | 95 mm | +6 mm |
| Jun | 25.1 °C | +1.6 °C | 75 mm | -19 mm |
| Jul | 27.5 °C | +1.6 °C | 91 mm | -5 mm |
| Aug | 26.2 °C | +1.7 °C | 61 mm | -31 mm |
| Sep | 22.1 °C | +2.2 °C | 50 mm | -42 mm |
| Oct | 15.8 °C | +3.0 °C | 120 mm | +31 mm |
| Nov | 3.1 °C | -1.9 °C | 89 mm | +4 mm |
| Dec | -3.9 °C | -1.4 °C | 72 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 Clarence-Rockland?
Clarence-Rockland has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 6.2 °C and it receives 1,007 mm of precipitation per year.
What is the hottest day ever recorded in Clarence-Rockland?
The hottest day measured in Clarence-Rockland between 1940 and 2025 was 20 July 1977, reaching 37.4 °C.
What is the coldest day in Clarence-Rockland?
The coldest day measured in Clarence-Rockland between 1940 and 2025 was 15 January 1957, at -36.7 °C.
Does it snow in Clarence-Rockland?
Yes. Clarence-Rockland gets on average 150.7 cm of snow per year and has around 153 frost days.
Has the climate of Clarence-Rockland warmed?
Yes: Clarence-Rockland warmed by +1.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Clarence-Rockland?
The wettest day measured in Clarence-Rockland between 1940 and 2025 was 9 September 2004, with 89 mm of rain in 24 hours.
What was the windiest day in Clarence-Rockland?
The windiest day measured in Clarence-Rockland between 1940 and 2025 was 25 November 1950, with winds reaching 44.6 km/h.
What is the warmest month in Clarence-Rockland?
The warmest month in Clarence-Rockland is July (20.6 °C on average); the coldest is January (-10.1 °C).
How much does it rain in Clarence-Rockland?
Clarence-Rockland receives on average 1,007 mm of precipitation per year, spread over about 135 rainy days.
Is it sunny in Clarence-Rockland?
Clarence-Rockland gets on average 8.3 hours of sunshine per day, roughly 3,030 hours per year over 1940-2025.
What is the biggest single-day snowfall in Clarence-Rockland?
The heaviest 24-hour snowfall measured in Clarence-Rockland between 1940 and 2025 was 3 April 1975, with 28.7 cm.
Are there tropical nights in Clarence-Rockland?
Yes: Clarence-Rockland has on average 5 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Clarence-Rockland?
In Clarence-Rockland, between 1940 and 2025, the highest apparent temperature reached 41.4 °C on 1 August 1975, and the lowest was -41.9 °C on 15 January 1957.
Compare Clarence-Rockland with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Clarence-Rockland