Bellingham climate — normals and trends
Bellingham (United States) has a warm-summer mediterranean climate (Csb) under the Köppen-Geiger classification. Its mean annual temperature is 9.7 °C and it receives 1,614 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 August (16.6 °C on average) and the coldest is January (3.7 °C). Rainfall peaks in November.
Bellingham averages 19 frost days, 0 hot days (≥ 30 °C) and 164 rainy days per year.
Bellingham has warmed by +1.6 °C between 1940 and 2025, or +0.19 °C per decade. This trend is statistically significant.
The number of frost days there went from about 30 to 8 per year over the period.
The hottest day of the period reached 34.6 °C (on 28 June 2021) and the coldest -18.4 °C (on 25 January 1950).
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
BellinghamWashington
- coords
- 48.76°, -122.49°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.7°C
Average daily high
12.2°C
Average daily low
7.4°C
Annual rainfall
1,614mm
Sunshine / day
8.8h
Mean relative humidity
82%
Average peak wind
14.5km/h
Seasonal range
12.9°C
Frost days (< 0 °C)
19 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
164 d/yr
Annual snowfall
51.4 cm
Average feels-like high
10.5 °C
Average feels-like low
5.1 °C
Average peak gust
33.0 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
12.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.6 °C
since 1940
+0.2 °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
34.6 °C
28 June 2021
Coldest day
-18.4 °C
25 January 1950
Wettest day
72 mm
16 October 2003
Windiest day
49.0 km/h
13 October 1962
Strongest gust
118.4 km/h
15 November 2006
Hottest feels-like
36.0 °C
28 June 2021
Coldest feels-like
-25.1 °C
13 January 1950
Snowiest day
22.8 cm
21 January 1954
Sunniest day
15.8 h
6 June 1940
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 | 6.3 °C | +0.6 °C | 83 mm | -128 mm |
| Feb | 5.6 °C | -1.6 °C | 148 mm | -19 mm |
| Mar | 9.6 °C | +0.9 °C | 216 mm | +48 mm |
| Apr | 12.2 °C | +1.2 °C | 107 mm | -18 mm |
| May | 14.1 °C | +0.2 °C | 69 mm | -20 mm |
| Jun | 16.7 °C | +0.5 °C | 26 mm | -39 mm |
| Jul | 19.5 °C | +0.6 °C | 6 mm | -31 mm |
| Aug | 20.6 °C | +1.3 °C | 67 mm | +19 mm |
| Sep | 18.5 °C | +1.1 °C | 35 mm | -49 mm |
| Oct | 13.1 °C | 0.0 °C | 162 mm | -11 mm |
| Nov | 10.2 °C | +1.6 °C | 202 mm | -28 mm |
| Dec | 8.2 °C | +2.1 °C | 336 mm | +118 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 Bellingham?
Bellingham has a warm-summer mediterranean climate (Köppen Csb). Over 1940-2025, the average annual temperature is 9.7 °C and it receives 1,614 mm of precipitation per year.
What is the hottest day ever recorded in Bellingham?
The hottest day measured in Bellingham between 1940 and 2025 was 28 June 2021, reaching 34.6 °C.
What is the coldest day in Bellingham?
The coldest day measured in Bellingham between 1940 and 2025 was 25 January 1950, at -18.4 °C.
Does it snow in Bellingham?
Yes. Bellingham gets on average 51.4 cm of snow per year and has around 19 frost days.
Has the climate of Bellingham warmed?
Yes: Bellingham warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Bellingham?
The wettest day measured in Bellingham between 1940 and 2025 was 16 October 2003, with 72 mm of rain in 24 hours.
What was the windiest day in Bellingham?
The windiest day measured in Bellingham between 1940 and 2025 was 13 October 1962, with winds reaching 49.0 km/h.
What is the warmest month in Bellingham?
The warmest month in Bellingham is August (16.6 °C on average); the coldest is January (3.7 °C).
How much does it rain in Bellingham?
Bellingham receives on average 1,614 mm of precipitation per year, spread over about 164 rainy days.
Is it sunny in Bellingham?
Bellingham gets on average 8.8 hours of sunshine per day, roughly 3,212 hours per year over 1940-2025.
What is the biggest single-day snowfall in Bellingham?
The heaviest 24-hour snowfall measured in Bellingham between 1940 and 2025 was 21 January 1954, with 22.8 cm.
Are there tropical nights in Bellingham?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Bellingham.
What was the most extreme apparent temperature in Bellingham?
In Bellingham, between 1940 and 2025, the highest apparent temperature reached 36.0 °C on 28 June 2021, and the lowest was -25.1 °C on 13 January 1950.
Compare Bellingham with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Bellingham