Arlon climate — normals and trends
Arlon (Belgium) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.6 °C and it receives 907 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 (16.8 °C on average) and the coldest is January (0.4 °C). Rainfall peaks in December.
Arlon averages 71 frost days, 2 hot days (≥ 30 °C) and 154 rainy days per year.
Arlon has warmed by +1.8 °C between 1940 and 2025, or +0.21 °C per decade. This trend is statistically significant.
The number of frost days there went from about 86 to 56 per year over the period.
The hottest day of the period reached 36.6 °C (on 25 July 2019) and the coldest -19.7 °C (on 22 January 1940).
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
ArlonWallonia
- coords
- 49.68°, 5.82°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.6°C
Average daily high
11.9°C
Average daily low
5.4°C
Annual rainfall
907mm
Sunshine / day
7.5h
Mean relative humidity
82%
Average peak wind
19.0km/h
Seasonal range
16.4°C
Frost days (< 0 °C)
71 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
154 d/yr
Annual snowfall
51.7 cm
Average feels-like high
9.3 °C
Average feels-like low
2.3 °C
Average peak gust
37.9 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
11.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.39 · 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
36.6 °C
25 July 2019
Coldest day
-19.7 °C
22 January 1940
Wettest day
66 mm
11 May 1970
Windiest day
56.2 km/h
24 November 1984
Strongest gust
127.4 km/h
24 November 1984
Hottest feels-like
37.3 °C
25 July 2019
Coldest feels-like
-25.9 °C
6 January 1947
Snowiest day
13.0 cm
13 December 1952
Sunniest day
15.4 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 | 4.3 °C | +1.9 °C | 144 mm | +65 mm |
| Feb | 5.1 °C | +1.2 °C | 50 mm | -19 mm |
| Mar | 12.0 °C | +4.0 °C | 15 mm | -56 mm |
| Apr | 15.6 °C | +3.6 °C | 59 mm | -9 mm |
| May | 18.2 °C | +2.2 °C | 48 mm | -34 mm |
| Jun | 23.6 °C | +4.5 °C | 70 mm | -10 mm |
| Jul | 22.6 °C | +1.6 °C | 120 mm | +43 mm |
| Aug | 23.4 °C | +2.7 °C | 41 mm | -35 mm |
| Sep | 17.6 °C | +0.2 °C | 162 mm | +93 mm |
| Oct | 12.8 °C | +0.3 °C | 108 mm | +37 mm |
| Nov | 8.5 °C | +1.9 °C | 62 mm | -17 mm |
| Dec | 6.5 °C | +2.9 °C | 34 mm | -51 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 Arlon?
Arlon has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 8.6 °C and it receives 907 mm of precipitation per year.
What is the hottest day ever recorded in Arlon?
The hottest day measured in Arlon between 1940 and 2025 was 25 July 2019, reaching 36.6 °C.
What is the coldest day in Arlon?
The coldest day measured in Arlon between 1940 and 2025 was 22 January 1940, at -19.7 °C.
Does it snow in Arlon?
Yes. Arlon gets on average 51.7 cm of snow per year and has around 71 frost days.
Has the climate of Arlon warmed?
Yes: Arlon warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Arlon?
The wettest day measured in Arlon between 1940 and 2025 was 11 May 1970, with 66 mm of rain in 24 hours.
What was the windiest day in Arlon?
The windiest day measured in Arlon between 1940 and 2025 was 24 November 1984, with winds reaching 56.2 km/h.
What is the warmest month in Arlon?
The warmest month in Arlon is July (16.8 °C on average); the coldest is January (0.4 °C).
How much does it rain in Arlon?
Arlon receives on average 907 mm of precipitation per year, spread over about 154 rainy days.
Is it sunny in Arlon?
Arlon gets on average 7.5 hours of sunshine per day, roughly 2,738 hours per year over 1940-2025.
What is the biggest single-day snowfall in Arlon?
The heaviest 24-hour snowfall measured in Arlon between 1940 and 2025 was 13 December 1952, with 13.0 cm.
Are there tropical nights in Arlon?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Arlon.
What was the most extreme apparent temperature in Arlon?
In Arlon, between 1940 and 2025, the highest apparent temperature reached 37.3 °C on 25 July 2019, and the lowest was -25.9 °C on 6 January 1947.
Compare Arlon with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Arlon