Oak Harbor climate — normals and trends
Oak Harbor (United States) has a warm-summer mediterranean climate (Csb) under the Köppen-Geiger classification. Its mean annual temperature is 10.0 °C and it receives 1,224 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 (15.0 °C on average) and the coldest is January (5.6 °C). Rainfall peaks in November.
Oak Harbor averages 4 frost days, 0 hot days (≥ 30 °C) and 161 rainy days per year.
Oak Harbor has warmed by +1.1 °C between 1940 and 2025, or +0.13 °C per decade. This trend is statistically significant.
The hottest day of the period reached 24.9 °C (on 13 July 1961) and the coldest -11.3 °C (on 13 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
Oak HarborWashington
- coords
- 48.29°, -122.64°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.0°C
Average daily high
11.4°C
Average daily low
8.9°C
Annual rainfall
1,224mm
Sunshine / day
8.9h
Mean relative humidity
80%
Average peak wind
21.9km/h
Seasonal range
9.4°C
Frost days (< 0 °C)
4 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
161 d/yr
Annual snowfall
17.5 cm
Average feels-like high
9.6 °C
Average feels-like low
5.6 °C
Average peak gust
31.7 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
12.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.1 °C
since 1940
+0.1 °C per decade · r² = 0.37 · 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
24.9 °C
13 July 1961
Coldest day
-11.3 °C
13 January 1950
Wettest day
73 mm
20 October 2003
Windiest day
73.9 km/h
12 October 1962
Strongest gust
98.6 km/h
15 November 2006
Hottest feels-like
27.7 °C
13 July 1961
Coldest feels-like
-20.0 °C
16 December 1964
Snowiest day
22.2 cm
29 December 1996
Sunniest day
15.7 h
10 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 | 7.1 °C | +0.3 °C | 58 mm | -103 mm |
| Feb | 6.6 °C | -1.0 °C | 121 mm | -4 mm |
| Mar | 9.2 °C | +0.5 °C | 155 mm | +34 mm |
| Apr | 11.2 °C | +0.9 °C | 67 mm | -21 mm |
| May | 12.5 °C | 0.0 °C | 58 mm | -8 mm |
| Jun | 14.9 °C | +0.5 °C | 33 mm | -21 mm |
| Jul | 17.1 °C | +0.9 °C | 10 mm | -22 mm |
| Aug | 17.8 °C | +1.2 °C | 70 mm | +30 mm |
| Sep | 16.6 °C | +1.4 °C | 30 mm | -33 mm |
| Oct | 12.6 °C | +0.2 °C | 130 mm | +3 mm |
| Nov | 10.7 °C | +1.5 °C | 152 mm | -24 mm |
| Dec | 9.1 °C | +1.8 °C | 258 mm | +86 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 Oak Harbor?
Oak Harbor has a warm-summer mediterranean climate (Köppen Csb). Over 1940-2025, the average annual temperature is 10.0 °C and it receives 1,224 mm of precipitation per year.
What is the hottest day ever recorded in Oak Harbor?
The hottest day measured in Oak Harbor between 1940 and 2025 was 13 July 1961, reaching 24.9 °C.
What is the coldest day in Oak Harbor?
The coldest day measured in Oak Harbor between 1940 and 2025 was 13 January 1950, at -11.3 °C.
Does it snow in Oak Harbor?
Yes. Oak Harbor gets on average 17.5 cm of snow per year and has around 4 frost days.
Has the climate of Oak Harbor warmed?
Yes: Oak Harbor warmed by +1.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Oak Harbor?
The wettest day measured in Oak Harbor between 1940 and 2025 was 20 October 2003, with 73 mm of rain in 24 hours.
What was the windiest day in Oak Harbor?
The windiest day measured in Oak Harbor between 1940 and 2025 was 12 October 1962, with winds reaching 73.9 km/h.
What is the warmest month in Oak Harbor?
The warmest month in Oak Harbor is August (15.0 °C on average); the coldest is January (5.6 °C).
How much does it rain in Oak Harbor?
Oak Harbor receives on average 1,224 mm of precipitation per year, spread over about 161 rainy days.
Is it sunny in Oak Harbor?
Oak Harbor gets on average 8.9 hours of sunshine per day, roughly 3,249 hours per year over 1940-2025.
What is the biggest single-day snowfall in Oak Harbor?
The heaviest 24-hour snowfall measured in Oak Harbor between 1940 and 2025 was 29 December 1996, with 22.2 cm.
Are there tropical nights in Oak Harbor?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Oak Harbor.
What was the most extreme apparent temperature in Oak Harbor?
In Oak Harbor, between 1940 and 2025, the highest apparent temperature reached 27.7 °C on 13 July 1961, and the lowest was -20.0 °C on 16 December 1964.
Compare Oak Harbor with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Oak Harbor