Waterloo climate — normals and trends
Waterloo (Canada) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 7.1 °C and it receives 906 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 (20.2 °C on average) and the coldest is January (-6.6 °C). Rainfall peaks in June.
Waterloo averages 147 frost days, 7 hot days (≥ 30 °C) and 133 rainy days per year.
Waterloo has warmed by +1.6 °C between 1940 and 2025, or +0.19 °C per decade. This trend is statistically significant.
The number of frost days there went from about 157 to 137 per year over the period.
The hottest day of the period reached 35.7 °C (on 14 July 1995) and the coldest -32.4 °C (on 12 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
WaterlooOntario
- coords
- 43.47°, -80.52°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
7.1°C
Average daily high
11.7°C
Average daily low
2.4°C
Annual rainfall
906mm
Sunshine / day
8.6h
Mean relative humidity
74%
Average peak wind
18.9km/h
Seasonal range
26.8°C
Frost days (< 0 °C)
147 d/yr
Hot days (≥ 30 °C)
7 d/yr
Rainy days (≥ 1 mm)
133 d/yr
Annual snowfall
120.1 cm
Average feels-like high
9.2 °C
Average feels-like low
-0.9 °C
Average peak gust
40.5 km/h
Tropical nights (≥ 20 °C)
5 d/yr
Solar radiation
13.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.6 °C
since 1940
+0.2 °C per decade · r² = 0.30 · 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
35.7 °C
14 July 1995
Coldest day
-32.4 °C
12 January 1982
Wettest day
81 mm
15 October 1954
Windiest day
50.8 km/h
6 April 1979
Strongest gust
108.7 km/h
6 April 1985
Hottest feels-like
39.7 °C
14 July 1995
Coldest feels-like
-37.4 °C
16 February 2015
Snowiest day
28.4 cm
25 February 1965
Sunniest day
15.0 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 | -4.2 °C | -1.4 °C | 45 mm | -18 mm |
| Feb | -3.1 °C | -1.4 °C | 73 mm | +17 mm |
| Mar | 7.0 °C | +3.3 °C | 82 mm | +12 mm |
| Apr | 12.2 °C | +0.9 °C | 78 mm | -3 mm |
| May | 16.4 °C | -1.5 °C | 70 mm | -15 mm |
| Jun | 24.6 °C | +1.5 °C | 93 mm | +2 mm |
| Jul | 27.3 °C | +2.0 °C | 46 mm | -39 mm |
| Aug | 24.3 °C | +0.1 °C | 60 mm | -19 mm |
| Sep | 22.3 °C | +2.1 °C | 57 mm | -20 mm |
| Oct | 15.3 °C | +1.8 °C | 61 mm | -12 mm |
| Nov | 5.6 °C | -0.5 °C | 68 mm | -8 mm |
| Dec | -1.2 °C | -1.1 °C | 98 mm | +28 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 Waterloo?
Waterloo has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 7.1 °C and it receives 906 mm of precipitation per year.
What is the hottest day ever recorded in Waterloo?
The hottest day measured in Waterloo between 1940 and 2025 was 14 July 1995, reaching 35.7 °C.
What is the coldest day in Waterloo?
The coldest day measured in Waterloo between 1940 and 2025 was 12 January 1982, at -32.4 °C.
Does it snow in Waterloo?
Yes. Waterloo gets on average 120.1 cm of snow per year and has around 147 frost days.
Has the climate of Waterloo warmed?
Yes: Waterloo warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Waterloo?
The wettest day measured in Waterloo between 1940 and 2025 was 15 October 1954, with 81 mm of rain in 24 hours.
What was the windiest day in Waterloo?
The windiest day measured in Waterloo between 1940 and 2025 was 6 April 1979, with winds reaching 50.8 km/h.
What is the warmest month in Waterloo?
The warmest month in Waterloo is July (20.2 °C on average); the coldest is January (-6.6 °C).
How much does it rain in Waterloo?
Waterloo receives on average 906 mm of precipitation per year, spread over about 133 rainy days.
Is it sunny in Waterloo?
Waterloo gets on average 8.6 hours of sunshine per day, roughly 3,139 hours per year over 1940-2025.
What is the biggest single-day snowfall in Waterloo?
The heaviest 24-hour snowfall measured in Waterloo between 1940 and 2025 was 25 February 1965, with 28.4 cm.
Are there tropical nights in Waterloo?
Yes: Waterloo has on average 5 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Waterloo?
In Waterloo, between 1940 and 2025, the highest apparent temperature reached 39.7 °C on 14 July 1995, and the lowest was -37.4 °C on 16 February 2015.
Compare Waterloo with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Waterloo