Olne climate — normals and trends
Olne has a temperate oceanic climate, averaging 8.8 °C annually with 1,000 mm of rain per year.
Climate normals · ERA5
OlneWallonia
- coords
- 50.59°, 5.75°
- period
- 1940–2025 · 86 yrs
The normals for this period
The average of every indicator across the whole window: temperature, water, sky, wind and notable days.
Mean daily temperature
8.8°C
Average daily high
12.0°C
Average daily low
5.5°C
Annual rainfall
1,000mm
Sunshine / day
7.4h
Mean relative humidity
82%
Average peak wind
20.1km/h
Seasonal range
15.7°C
Frost days (< 0 °C)
68 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
171 d/yr
Annual snowfall
63.5 cm
Average feels-like high
9.4 °C
Average feels-like low
2.3 °C
Average peak gust
39.9 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
10.7 MJ/m²
Has the climate changed?
What the yearly averages say about warming here, and whether the slope is statistically solid.
+2.0 °C
since 1940
+0.2 °C per decade · r² = 0.42 · 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).
Climate month by month
How an average year unfolds: when it rains, when it turns hot, when the sun is out.
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
The most extreme days ever measured here, then the year-by-year detail.
Hottest day
38.2 °C
25 July 2019
Coldest day
-22.9 °C
1 January 1979
Wettest day
80 mm
14 July 2021
Windiest day
58.4 km/h
24 November 1984
Strongest gust
135.0 km/h
24 November 1984
Hottest feels-like
39.0 °C
27 June 2026
Coldest feels-like
-28.1 °C
1 January 1979
Snowiest day
16.2 cm
1 February 1953
Sunniest day
15.5 h
3 July 2019
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and compare it with the normal: warmer, drier, more extreme?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 3.7 °C | +0.7 °C | 179 mm | +85 mm |
| Feb | 5.7 °C | +1.5 °C | 43 mm | -38 mm |
| Mar | 12.0 °C | +4.0 °C | 14 mm | -68 mm |
| Apr | 15.6 °C | +3.8 °C | 53 mm | -18 mm |
| May | 18.2 °C | +2.3 °C | 63 mm | -19 mm |
| Jun | 22.9 °C | +4.1 °C | 74 mm | -10 mm |
| Jul | 22.6 °C | +2.0 °C | 133 mm | +43 mm |
| Aug | 22.9 °C | +2.6 °C | 36 mm | -46 mm |
| Sep | 17.9 °C | +0.7 °C | 102 mm | +31 mm |
| Oct | 12.5 °C | -0.2 °C | 108 mm | +34 mm |
| Nov | 9.0 °C | +1.8 °C | 67 mm | -21 mm |
| Dec | 7.2 °C | +3.1 °C | 38 mm | -61 mm |
The year's extremes
What was the weather like that day?
The weather actually measured on a given date, anywhere in the covered window.
Olne (Belgium) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.8 °C and it receives 1,000 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 (16.6 °C on average) and the coldest is January (0.9 °C). Rainfall peaks in December.
Olne averages 68 frost days, 2 hot days (≥ 30 °C) and 171 rainy days per year.
Olne has warmed by +2.0 °C between 1940 and 2025, or +0.24 °C per decade. This trend is statistically significant.
The number of frost days there went from about 86 to 50 per year over the period.
The hottest day of the period reached 38.2 °C (on 25 July 2019) and the coldest -22.9 °C (on 1 January 1979).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Frequently asked questions
What is the climate of Olne?
Olne has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 8.8 °C and it receives 1,000 mm of precipitation per year.
What is the hottest day ever recorded in Olne?
The hottest day measured in Olne between 1940 and 2025 was 25 July 2019, reaching 38.2 °C.
What is the coldest day in Olne?
The coldest day measured in Olne between 1940 and 2025 was 1 January 1979, at -22.9 °C.
Does it snow in Olne?
Yes. Olne gets on average 63.5 cm of snow per year and has around 68 frost days.
Has the climate of Olne warmed?
Yes: Olne warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Olne?
The wettest day measured in Olne between 1940 and 2025 was 14 July 2021, with 80 mm of rain in 24 hours.
What was the windiest day in Olne?
The windiest day measured in Olne between 1940 and 2025 was 24 November 1984, with winds reaching 58.4 km/h.
What is the warmest month in Olne?
The warmest month in Olne is July (16.6 °C on average); the coldest is January (0.9 °C).
How much does it rain in Olne?
Olne receives on average 1,000 mm of precipitation per year, spread over about 171 rainy days.
Is it sunny in Olne?
Olne gets on average 7.4 hours of sunshine per day, roughly 2,701 hours per year over 1940-2025.
What is the biggest single-day snowfall in Olne?
The heaviest 24-hour snowfall measured in Olne between 1940 and 2025 was 1 February 1953, with 16.2 cm.
Are there tropical nights in Olne?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Olne.
What was the most extreme apparent temperature in Olne?
In Olne, between 1940 and 2025, the highest apparent temperature reached 39.0 °C on 27 June 2026, and the lowest was -28.1 °C on 1 January 1979.
These forecasts and records come from our own weather API. Developer documentation →
Compare Olne with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Olne