Olympia climate — normals and trends
Olympia (United States) has a warm-summer mediterranean climate (Csb) under the Köppen-Geiger classification. Its mean annual temperature is 10.5 °C and it receives 1,421 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 (17.6 °C on average) and the coldest is January (4.2 °C). Rainfall peaks in November.
Olympia averages 21 frost days, 5 hot days (≥ 30 °C) and 149 rainy days per year.
Olympia has warmed by +1.4 °C between 1940 and 2025, or +0.16 °C per decade. This trend is statistically significant.
The number of frost days there went from about 29 to 13 per year over the period.
The hottest day of the period reached 39.9 °C (on 28 June 2021) and the coldest -18.0 °C (on 31 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
OlympiaWashington
- coords
- 47.04°, -122.90°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.5°C
Average daily high
14.5°C
Average daily low
7.1°C
Annual rainfall
1,421mm
Sunshine / day
8.4h
Mean relative humidity
80%
Average peak wind
13.6km/h
Seasonal range
13.4°C
Frost days (< 0 °C)
21 d/yr
Hot days (≥ 30 °C)
5 d/yr
Rainy days (≥ 1 mm)
149 d/yr
Annual snowfall
37.3 cm
Average feels-like high
12.9 °C
Average feels-like low
4.9 °C
Average peak gust
33.7 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
12.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.4 °C
since 1940
+0.2 °C per decade · r² = 0.36 · 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
39.9 °C
28 June 2021
Coldest day
-18.0 °C
31 January 1950
Wettest day
95 mm
25 November 1998
Windiest day
44.0 km/h
12 October 1962
Strongest gust
112.7 km/h
9 December 1987
Hottest feels-like
41.3 °C
28 June 2021
Coldest feels-like
-22.9 °C
31 January 1950
Snowiest day
21.5 cm
19 January 1943
Sunniest day
15.5 h
17 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 | 7.3 °C | +0.8 °C | 69 mm | -132 mm |
| Feb | 7.4 °C | -1.0 °C | 171 mm | +13 mm |
| Mar | 11.4 °C | +0.8 °C | 208 mm | +46 mm |
| Apr | 15.5 °C | +2.0 °C | 72 mm | -42 mm |
| May | 17.7 °C | +0.6 °C | 41 mm | -34 mm |
| Jun | 21.3 °C | +1.5 °C | 17 mm | -31 mm |
| Jul | 24.1 °C | +0.9 °C | 0 mm | -19 mm |
| Aug | 24.4 °C | +1.1 °C | 37 mm | +7 mm |
| Sep | 21.4 °C | +1.0 °C | 41 mm | -19 mm |
| Oct | 14.8 °C | 0.0 °C | 150 mm | +16 mm |
| Nov | 11.1 °C | +1.5 °C | 181 mm | -30 mm |
| Dec | 9.3 °C | +2.5 °C | 275 mm | +66 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 Olympia?
Olympia has a warm-summer mediterranean climate (Köppen Csb). Over 1940-2025, the average annual temperature is 10.5 °C and it receives 1,421 mm of precipitation per year.
What is the hottest day ever recorded in Olympia?
The hottest day measured in Olympia between 1940 and 2025 was 28 June 2021, reaching 39.9 °C.
What is the coldest day in Olympia?
The coldest day measured in Olympia between 1940 and 2025 was 31 January 1950, at -18.0 °C.
Does it snow in Olympia?
Yes. Olympia gets on average 37.3 cm of snow per year and has around 21 frost days.
Has the climate of Olympia warmed?
Yes: Olympia warmed by +1.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Olympia?
The wettest day measured in Olympia between 1940 and 2025 was 25 November 1998, with 95 mm of rain in 24 hours.
What was the windiest day in Olympia?
The windiest day measured in Olympia between 1940 and 2025 was 12 October 1962, with winds reaching 44.0 km/h.
What is the warmest month in Olympia?
The warmest month in Olympia is August (17.6 °C on average); the coldest is January (4.2 °C).
How much does it rain in Olympia?
Olympia receives on average 1,421 mm of precipitation per year, spread over about 149 rainy days.
Is it sunny in Olympia?
Olympia gets on average 8.4 hours of sunshine per day, roughly 3,066 hours per year over 1940-2025.
What is the biggest single-day snowfall in Olympia?
The heaviest 24-hour snowfall measured in Olympia between 1940 and 2025 was 19 January 1943, with 21.5 cm.
Are there tropical nights in Olympia?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Olympia.
What was the most extreme apparent temperature in Olympia?
In Olympia, between 1940 and 2025, the highest apparent temperature reached 41.3 °C on 28 June 2021, and the lowest was -22.9 °C on 31 January 1950.
Compare Olympia with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Olympia