Mosfellsbaer climate — normals and trends
Mosfellsbaer (Iceland) has a subarctic climate (Dfc) under the Köppen-Geiger classification. Its mean annual temperature is 3.4 °C and it receives 1,278 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 (10.9 °C on average) and the coldest is January (-2.9 °C). Rainfall peaks in January.
Mosfellsbaer averages 150 frost days, 0 hot days (≥ 30 °C) and 191 rainy days per year.
Mosfellsbaer has warmed by +2.5 °C between 1940 and 2025, or +0.30 °C per decade. This trend is statistically significant.
The number of frost days there went from about 177 to 123 per year over the period.
The hottest day of the period reached 25.4 °C (on 30 July 2008) and the coldest -30.6 °C (on 7 February 1969).
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
MosfellsbaerCapital Region
- coords
- 64.17°, -21.70°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
3.4°C
Average daily high
6.1°C
Average daily low
0.5°C
Annual rainfall
1,278mm
Sunshine / day
6.6h
Mean relative humidity
81%
Average peak wind
17.9km/h
Seasonal range
13.8°C
Frost days (< 0 °C)
150 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
191 d/yr
Annual snowfall
212.6 cm
Average feels-like high
2.5 °C
Average feels-like low
-3.2 °C
Average peak gust
44.8 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
8.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.5 °C
since 1940
+0.3 °C per decade · r² = 0.44 · 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
25.4 °C
30 July 2008
Coldest day
-30.6 °C
7 February 1969
Wettest day
49 mm
16 March 1969
Windiest day
67.7 km/h
3 February 1991
Strongest gust
166.0 km/h
16 February 1981
Hottest feels-like
25.2 °C
31 July 1980
Coldest feels-like
-35.5 °C
9 January 1944
Snowiest day
22.4 cm
29 December 2003
Sunniest day
19.9 h
19 June 1943
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 | -0.5 °C | -0.3 °C | 132 mm | +6 mm |
| Feb | 4.5 °C | +4.0 °C | 167 mm | +49 mm |
| Mar | 4.6 °C | +2.7 °C | 172 mm | +53 mm |
| Apr | 7.7 °C | +2.9 °C | 61 mm | -38 mm |
| May | 11.4 °C | +2.3 °C | 84 mm | -3 mm |
| Jun | 10.8 °C | -1.2 °C | 79 mm | -6 mm |
| Jul | 14.1 °C | +0.5 °C | 94 mm | +16 mm |
| Aug | 13.9 °C | +1.0 °C | 81 mm | -12 mm |
| Sep | 11.2 °C | +1.3 °C | 146 mm | +33 mm |
| Oct | 5.6 °C | -0.1 °C | 126 mm | +3 mm |
| Nov | 1.8 °C | -0.3 °C | 43 mm | -71 mm |
| Dec | 4.4 °C | +4.1 °C | 87 mm | -38 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 Mosfellsbaer?
Mosfellsbaer has a subarctic climate (Köppen Dfc). Over 1940-2025, the average annual temperature is 3.4 °C and it receives 1,278 mm of precipitation per year.
What is the hottest day ever recorded in Mosfellsbaer?
The hottest day measured in Mosfellsbaer between 1940 and 2025 was 30 July 2008, reaching 25.4 °C.
What is the coldest day in Mosfellsbaer?
The coldest day measured in Mosfellsbaer between 1940 and 2025 was 7 February 1969, at -30.6 °C.
Does it snow in Mosfellsbaer?
Yes. Mosfellsbaer gets on average 212.6 cm of snow per year and has around 150 frost days.
Has the climate of Mosfellsbaer warmed?
Yes: Mosfellsbaer warmed by +2.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Mosfellsbaer?
The wettest day measured in Mosfellsbaer between 1940 and 2025 was 16 March 1969, with 49 mm of rain in 24 hours.
What was the windiest day in Mosfellsbaer?
The windiest day measured in Mosfellsbaer between 1940 and 2025 was 3 February 1991, with winds reaching 67.7 km/h.
What is the warmest month in Mosfellsbaer?
The warmest month in Mosfellsbaer is July (10.9 °C on average); the coldest is January (-2.9 °C).
How much does it rain in Mosfellsbaer?
Mosfellsbaer receives on average 1,278 mm of precipitation per year, spread over about 191 rainy days.
Is it sunny in Mosfellsbaer?
Mosfellsbaer gets on average 6.6 hours of sunshine per day, roughly 2,409 hours per year over 1940-2025.
What is the biggest single-day snowfall in Mosfellsbaer?
The heaviest 24-hour snowfall measured in Mosfellsbaer between 1940 and 2025 was 29 December 2003, with 22.4 cm.
Are there tropical nights in Mosfellsbaer?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Mosfellsbaer.
What was the most extreme apparent temperature in Mosfellsbaer?
In Mosfellsbaer, between 1940 and 2025, the highest apparent temperature reached 25.2 °C on 31 July 1980, and the lowest was -35.5 °C on 9 January 1944.
Compare Mosfellsbaer with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Mosfellsbaer