Stittsville climate — normals and trends
Stittsville (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 948 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 (20.7 °C on average) and the coldest is January (-9.6 °C). Rainfall peaks in July.
Stittsville averages 150 frost days, 11 hot days (≥ 30 °C) and 133 rainy days per year.
Stittsville 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 154 to 146 per year over the period.
The hottest day of the period reached 37.8 °C (on 1 August 1975) and the coldest -37.7 °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
StittsvilleOntario
- coords
- 45.25°, -75.92°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
6.4°C
Average daily high
11.3°C
Average daily low
1.5°C
Annual rainfall
948mm
Sunshine / day
8.3h
Mean relative humidity
72%
Average peak wind
16.1km/h
Seasonal range
30.3°C
Frost days (< 0 °C)
150 d/yr
Hot days (≥ 30 °C)
11 d/yr
Rainy days (≥ 1 mm)
133 d/yr
Annual snowfall
141.6 cm
Average feels-like high
8.9 °C
Average feels-like low
-1.7 °C
Average peak gust
37.2 km/h
Tropical nights (≥ 20 °C)
6 d/yr
Solar radiation
13.4 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
37.8 °C
1 August 1975
Coldest day
-37.7 °C
15 January 1957
Wettest day
82 mm
9 September 2004
Windiest day
44.8 km/h
10 March 2002
Strongest gust
101.9 km/h
13 November 1992
Hottest feels-like
41.9 °C
1 August 1975
Coldest feels-like
-42.9 °C
15 January 1957
Snowiest day
31.4 cm
3 April 1975
Sunniest day
15.4 h
19 June 2013
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 | -4.5 °C | +0.6 °C | 38 mm | -23 mm |
| Feb | -4.2 °C | -1.0 °C | 72 mm | +15 mm |
| Mar | 5.4 °C | +2.6 °C | 106 mm | +37 mm |
| Apr | 11.7 °C | +0.5 °C | 107 mm | +22 mm |
| May | 18.5 °C | -0.1 °C | 97 mm | +14 mm |
| Jun | 24.8 °C | +1.3 °C | 90 mm | +2 mm |
| Jul | 27.9 °C | +1.8 °C | 74 mm | -17 mm |
| Aug | 26.3 °C | +1.4 °C | 57 mm | -29 mm |
| Sep | 22.3 °C | +2.1 °C | 43 mm | -42 mm |
| Oct | 15.9 °C | +2.7 °C | 89 mm | +4 mm |
| Nov | 3.5 °C | -1.9 °C | 79 mm | -2 mm |
| Dec | -3.1 °C | -1.1 °C | 68 mm | -7 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 Stittsville?
Stittsville has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 6.4 °C and it receives 948 mm of precipitation per year.
What is the hottest day ever recorded in Stittsville?
The hottest day measured in Stittsville between 1940 and 2025 was 1 August 1975, reaching 37.8 °C.
What is the coldest day in Stittsville?
The coldest day measured in Stittsville between 1940 and 2025 was 15 January 1957, at -37.7 °C.
Does it snow in Stittsville?
Yes. Stittsville gets on average 141.6 cm of snow per year and has around 150 frost days.
Has the climate of Stittsville warmed?
Yes: Stittsville warmed by +1.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Stittsville?
The wettest day measured in Stittsville between 1940 and 2025 was 9 September 2004, with 82 mm of rain in 24 hours.
What was the windiest day in Stittsville?
The windiest day measured in Stittsville between 1940 and 2025 was 10 March 2002, with winds reaching 44.8 km/h.
What is the warmest month in Stittsville?
The warmest month in Stittsville is July (20.7 °C on average); the coldest is January (-9.6 °C).
How much does it rain in Stittsville?
Stittsville receives on average 948 mm of precipitation per year, spread over about 133 rainy days.
Is it sunny in Stittsville?
Stittsville 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 Stittsville?
The heaviest 24-hour snowfall measured in Stittsville between 1940 and 2025 was 3 April 1975, with 31.4 cm.
Are there tropical nights in Stittsville?
Yes: Stittsville has on average 6 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Stittsville?
In Stittsville, between 1940 and 2025, the highest apparent temperature reached 41.9 °C on 1 August 1975, and the lowest was -42.9 °C on 15 January 1957.
Compare Stittsville with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Stittsville