Arendal climate — normals and trends
Arendal (Norway) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 7.4 °C and it receives 1,026 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 (17.0 °C on average) and the coldest is January (-1.1 °C). Rainfall peaks in November.
Arendal averages 95 frost days, 0 hot days (≥ 30 °C) and 139 rainy days per year.
Arendal has warmed by +2.4 °C between 1940 and 2025, or +0.28 °C per decade. This trend is statistically significant.
The number of frost days there went from about 118 to 72 per year over the period.
The hottest day of the period reached 33.0 °C (on 11 August 1975) and the coldest -21.8 °C (on 5 February 1941).
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
ArendalAgder
- coords
- 58.46°, 8.77°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
7.4°C
Average daily high
10.6°C
Average daily low
4.3°C
Annual rainfall
1,026mm
Sunshine / day
8.0h
Mean relative humidity
76%
Average peak wind
18.7km/h
Seasonal range
18.1°C
Frost days (< 0 °C)
95 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
139 d/yr
Annual snowfall
155.5 cm
Average feels-like high
7.5 °C
Average feels-like low
0.8 °C
Average peak gust
40.2 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
10.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.4 °C
since 1940
+0.3 °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
33.0 °C
11 August 1975
Coldest day
-21.8 °C
5 February 1941
Wettest day
65 mm
18 September 2023
Windiest day
50.7 km/h
16 October 1987
Strongest gust
117.4 km/h
15 September 1994
Hottest feels-like
33.3 °C
11 August 1975
Coldest feels-like
-29.5 °C
26 January 1942
Snowiest day
34.8 cm
6 January 2025
Sunniest day
17.1 h
9 June 2025
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 | 1.9 °C | +0.9 °C | 144 mm | +49 mm |
| Feb | 2.6 °C | +1.1 °C | 54 mm | -17 mm |
| Mar | 8.7 °C | +3.9 °C | 31 mm | -38 mm |
| Apr | 13.9 °C | +4.3 °C | 39 mm | -19 mm |
| May | 16.7 °C | +1.7 °C | 34 mm | -34 mm |
| Jun | 19.8 °C | +0.8 °C | 49 mm | -20 mm |
| Jul | 24.5 °C | +3.5 °C | 78 mm | -4 mm |
| Aug | 20.5 °C | +0.7 °C | 94 mm | -8 mm |
| Sep | 16.7 °C | +0.9 °C | 170 mm | +71 mm |
| Oct | 12.7 °C | +1.9 °C | 146 mm | +39 mm |
| Nov | 7.2 °C | +1.5 °C | 111 mm | +0 mm |
| Dec | 5.8 °C | +3.1 °C | 125 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 Arendal?
Arendal has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 7.4 °C and it receives 1,026 mm of precipitation per year.
What is the hottest day ever recorded in Arendal?
The hottest day measured in Arendal between 1940 and 2025 was 11 August 1975, reaching 33.0 °C.
What is the coldest day in Arendal?
The coldest day measured in Arendal between 1940 and 2025 was 5 February 1941, at -21.8 °C.
Does it snow in Arendal?
Yes. Arendal gets on average 155.5 cm of snow per year and has around 95 frost days.
Has the climate of Arendal warmed?
Yes: Arendal warmed by +2.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Arendal?
The wettest day measured in Arendal between 1940 and 2025 was 18 September 2023, with 65 mm of rain in 24 hours.
What was the windiest day in Arendal?
The windiest day measured in Arendal between 1940 and 2025 was 16 October 1987, with winds reaching 50.7 km/h.
What is the warmest month in Arendal?
The warmest month in Arendal is July (17.0 °C on average); the coldest is January (-1.1 °C).
How much does it rain in Arendal?
Arendal receives on average 1,026 mm of precipitation per year, spread over about 139 rainy days.
Is it sunny in Arendal?
Arendal gets on average 8.0 hours of sunshine per day, roughly 2,920 hours per year over 1940-2025.
What is the biggest single-day snowfall in Arendal?
The heaviest 24-hour snowfall measured in Arendal between 1940 and 2025 was 6 January 2025, with 34.8 cm.
Are there tropical nights in Arendal?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Arendal.
What was the most extreme apparent temperature in Arendal?
In Arendal, between 1940 and 2025, the highest apparent temperature reached 33.3 °C on 11 August 1975, and the lowest was -29.5 °C on 26 January 1942.
Compare Arendal with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Arendal