Halden climate — normals and trends
Halden (Norway) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 6.6 °C and it receives 823 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 (-2.7 °C). Rainfall peaks in August.
Halden averages 113 frost days, 0 hot days (≥ 30 °C) and 133 rainy days per year.
Halden has warmed by +2.1 °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 130 to 96 per year over the period.
The hottest day of the period reached 32.6 °C (on 10 August 1975) and the coldest -27.8 °C (on 16 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
HaldenØstfold
- coords
- 59.12°, 11.39°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
6.6°C
Average daily high
9.9°C
Average daily low
3.3°C
Annual rainfall
823mm
Sunshine / day
8.1h
Mean relative humidity
80%
Average peak wind
17.2km/h
Seasonal range
19.3°C
Frost days (< 0 °C)
113 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
133 d/yr
Annual snowfall
96.2 cm
Average feels-like high
6.9 °C
Average feels-like low
0.1 °C
Average peak gust
38.7 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
10.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.1 °C
since 1940
+0.2 °C per decade · r² = 0.29 · 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
32.6 °C
10 August 1975
Coldest day
-27.8 °C
16 January 1940
Wettest day
42 mm
22 July 2022
Windiest day
48.8 km/h
29 September 1969
Strongest gust
109.8 km/h
29 November 1999
Hottest feels-like
33.9 °C
13 July 1941
Coldest feels-like
-33.9 °C
10 January 1987
Snowiest day
23.5 cm
6 November 1971
Sunniest day
17.7 h
21 June 2017
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 | 2.0 °C | +2.5 °C | 108 mm | +49 mm |
| Feb | 2.6 °C | +2.5 °C | 35 mm | -10 mm |
| Mar | 7.4 °C | +3.4 °C | 21 mm | -21 mm |
| Apr | 13.2 °C | +3.8 °C | 51 mm | +2 mm |
| May | 15.5 °C | +0.3 °C | 46 mm | -16 mm |
| Jun | 18.8 °C | 0.0 °C | 67 mm | -15 mm |
| Jul | 24.0 °C | +3.5 °C | 85 mm | -5 mm |
| Aug | 19.9 °C | +0.4 °C | 89 mm | -7 mm |
| Sep | 17.3 °C | +1.9 °C | 111 mm | +29 mm |
| Oct | 11.1 °C | +1.1 °C | 110 mm | +30 mm |
| Nov | 6.0 °C | +1.5 °C | 82 mm | +9 mm |
| Dec | 4.7 °C | +3.4 °C | 76 mm | +12 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 Halden?
Halden has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 6.6 °C and it receives 823 mm of precipitation per year.
What is the hottest day ever recorded in Halden?
The hottest day measured in Halden between 1940 and 2025 was 10 August 1975, reaching 32.6 °C.
What is the coldest day in Halden?
The coldest day measured in Halden between 1940 and 2025 was 16 January 1940, at -27.8 °C.
Does it snow in Halden?
Yes. Halden gets on average 96.2 cm of snow per year and has around 113 frost days.
Has the climate of Halden warmed?
Yes: Halden warmed by +2.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Halden?
The wettest day measured in Halden between 1940 and 2025 was 22 July 2022, with 42 mm of rain in 24 hours.
What was the windiest day in Halden?
The windiest day measured in Halden between 1940 and 2025 was 29 September 1969, with winds reaching 48.8 km/h.
What is the warmest month in Halden?
The warmest month in Halden is July (16.6 °C on average); the coldest is January (-2.7 °C).
How much does it rain in Halden?
Halden receives on average 823 mm of precipitation per year, spread over about 133 rainy days.
Is it sunny in Halden?
Halden gets on average 8.1 hours of sunshine per day, roughly 2,957 hours per year over 1940-2025.
What is the biggest single-day snowfall in Halden?
The heaviest 24-hour snowfall measured in Halden between 1940 and 2025 was 6 November 1971, with 23.5 cm.
Are there tropical nights in Halden?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Halden.
What was the most extreme apparent temperature in Halden?
In Halden, between 1940 and 2025, the highest apparent temperature reached 33.9 °C on 13 July 1941, and the lowest was -33.9 °C on 10 January 1987.
Compare Halden with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Halden