Waterloo climate — normals and trends
Waterloo (Belgium) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 10.1 °C and it receives 748 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 (17.7 °C on average) and the coldest is January (2.6 °C). Rainfall peaks in July.
Waterloo averages 47 frost days, 3 hot days (≥ 30 °C) and 145 rainy days per year.
Waterloo has warmed by +1.9 °C between 1940 and 2025, or +0.22 °C per decade. This trend is statistically significant.
The number of frost days there went from about 63 to 31 per year over the period.
The hottest day of the period reached 38.6 °C (on 25 July 2019) and the coldest -19.9 °C (on 27 January 1942).
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
WaterlooWallonia
- coords
- 50.71°, 4.40°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.1°C
Average daily high
13.5°C
Average daily low
6.8°C
Annual rainfall
748mm
Sunshine / day
7.6h
Mean relative humidity
80%
Average peak wind
20.0km/h
Seasonal range
15.1°C
Frost days (< 0 °C)
47 d/yr
Hot days (≥ 30 °C)
3 d/yr
Rainy days (≥ 1 mm)
145 d/yr
Annual snowfall
19.0 cm
Average feels-like high
11.0 °C
Average feels-like low
3.9 °C
Average peak gust
38.8 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
10.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.9 °C
since 1940
+0.2 °C per decade · r² = 0.43 · 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
38.6 °C
25 July 2019
Coldest day
-19.9 °C
27 January 1942
Wettest day
61 mm
29 August 1996
Windiest day
59.7 km/h
25 January 1990
Strongest gust
124.9 km/h
18 January 2007
Hottest feels-like
41.1 °C
25 July 2019
Coldest feels-like
-25.2 °C
27 January 1942
Snowiest day
10.8 cm
10 December 1990
Sunniest day
15.9 h
1 July 2018
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 | 5.1 °C | +0.3 °C | 154 mm | +95 mm |
| Feb | 7.2 °C | +1.2 °C | 45 mm | -10 mm |
| Mar | 13.1 °C | +3.5 °C | 14 mm | -46 mm |
| Apr | 17.1 °C | +3.9 °C | 27 mm | -29 mm |
| May | 19.6 °C | +2.4 °C | 62 mm | -6 mm |
| Jun | 23.8 °C | +3.8 °C | 55 mm | -13 mm |
| Jul | 24.2 °C | +2.4 °C | 80 mm | +8 mm |
| Aug | 24.4 °C | +2.7 °C | 32 mm | -35 mm |
| Sep | 19.8 °C | +1.0 °C | 55 mm | -2 mm |
| Oct | 14.5 °C | +0.2 °C | 70 mm | +11 mm |
| Nov | 10.6 °C | +1.8 °C | 59 mm | -5 mm |
| Dec | 8.4 °C | +2.6 °C | 32 mm | -32 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 temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 10.1 °C and it receives 748 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 25 July 2019, reaching 38.6 °C.
What is the coldest day in Waterloo?
The coldest day measured in Waterloo between 1940 and 2025 was 27 January 1942, at -19.9 °C.
Does it snow in Waterloo?
Yes. Waterloo gets on average 19.0 cm of snow per year and has around 47 frost days.
Has the climate of Waterloo warmed?
Yes: Waterloo warmed by +1.9 °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 29 August 1996, with 61 mm of rain in 24 hours.
What was the windiest day in Waterloo?
The windiest day measured in Waterloo between 1940 and 2025 was 25 January 1990, with winds reaching 59.7 km/h.
What is the warmest month in Waterloo?
The warmest month in Waterloo is July (17.7 °C on average); the coldest is January (2.6 °C).
How much does it rain in Waterloo?
Waterloo receives on average 748 mm of precipitation per year, spread over about 145 rainy days.
Is it sunny in Waterloo?
Waterloo gets on average 7.6 hours of sunshine per day, roughly 2,774 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 10 December 1990, with 10.8 cm.
Are there tropical nights in Waterloo?
Yes: Waterloo has on average 1 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 41.1 °C on 25 July 2019, and the lowest was -25.2 °C on 27 January 1942.
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