Spanaway climate — normals and trends
Spanaway (United States) has a warm-summer mediterranean climate (Csb) under the Köppen-Geiger classification. Its mean annual temperature is 10.1 °C and it receives 1,402 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 (17.4 °C on average) and the coldest is January (3.8 °C). Rainfall peaks in November.
Spanaway averages 33 frost days, 4 hot days (≥ 30 °C) and 156 rainy days per year.
Spanaway has warmed by +1.4 °C between 1940 and 2025, or +0.17 °C per decade. This trend is statistically significant.
The number of frost days there went from about 44 to 22 per year over the period.
The hottest day of the period reached 39.1 °C (on 28 June 2021) and the coldest -17.6 °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
SpanawayWashington
- coords
- 47.10°, -122.43°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.1°C
Average daily high
14.3°C
Average daily low
6.4°C
Annual rainfall
1,402mm
Sunshine / day
8.5h
Mean relative humidity
78%
Average peak wind
13.4km/h
Seasonal range
13.6°C
Frost days (< 0 °C)
33 d/yr
Hot days (≥ 30 °C)
4 d/yr
Rainy days (≥ 1 mm)
156 d/yr
Annual snowfall
48.3 cm
Average feels-like high
12.5 °C
Average feels-like low
3.9 °C
Average peak gust
33.4 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
39.1 °C
28 June 2021
Coldest day
-17.6 °C
31 January 1950
Wettest day
92 mm
25 November 1998
Windiest day
48.0 km/h
20 January 1993
Strongest gust
125.3 km/h
20 January 1993
Hottest feels-like
42.7 °C
28 June 2021
Coldest feels-like
-22.5 °C
31 January 1950
Snowiest day
30.0 cm
18 November 1946
Sunniest day
15.6 h
18 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 | 7.1 °C | +0.6 °C | 72 mm | -126 mm |
| Feb | 7.2 °C | -1.0 °C | 168 mm | +16 mm |
| Mar | 11.4 °C | +1.0 °C | 198 mm | +45 mm |
| Apr | 15.1 °C | +1.8 °C | 84 mm | -29 mm |
| May | 17.3 °C | +0.5 °C | 43 mm | -36 mm |
| Jun | 21.0 °C | +1.5 °C | 17 mm | -39 mm |
| Jul | 24.2 °C | +1.2 °C | 2 mm | -20 mm |
| Aug | 24.0 °C | +1.0 °C | 43 mm | +12 mm |
| Sep | 21.1 °C | +1.1 °C | 35 mm | -29 mm |
| Oct | 14.4 °C | -0.2 °C | 163 mm | +33 mm |
| Nov | 11.1 °C | +1.7 °C | 181 mm | -23 mm |
| Dec | 9.1 °C | +2.5 °C | 338 mm | +136 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 Spanaway?
Spanaway has a warm-summer mediterranean climate (Köppen Csb). Over 1940-2025, the average annual temperature is 10.1 °C and it receives 1,402 mm of precipitation per year.
What is the hottest day ever recorded in Spanaway?
The hottest day measured in Spanaway between 1940 and 2025 was 28 June 2021, reaching 39.1 °C.
What is the coldest day in Spanaway?
The coldest day measured in Spanaway between 1940 and 2025 was 31 January 1950, at -17.6 °C.
Does it snow in Spanaway?
Yes. Spanaway gets on average 48.3 cm of snow per year and has around 33 frost days.
Has the climate of Spanaway warmed?
Yes: Spanaway warmed by +1.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Spanaway?
The wettest day measured in Spanaway between 1940 and 2025 was 25 November 1998, with 92 mm of rain in 24 hours.
What was the windiest day in Spanaway?
The windiest day measured in Spanaway between 1940 and 2025 was 20 January 1993, with winds reaching 48.0 km/h.
What is the warmest month in Spanaway?
The warmest month in Spanaway is July (17.4 °C on average); the coldest is January (3.8 °C).
How much does it rain in Spanaway?
Spanaway receives on average 1,402 mm of precipitation per year, spread over about 156 rainy days.
Is it sunny in Spanaway?
Spanaway gets on average 8.5 hours of sunshine per day, roughly 3,103 hours per year over 1940-2025.
What is the biggest single-day snowfall in Spanaway?
The heaviest 24-hour snowfall measured in Spanaway between 1940 and 2025 was 18 November 1946, with 30.0 cm.
Are there tropical nights in Spanaway?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Spanaway.
What was the most extreme apparent temperature in Spanaway?
In Spanaway, between 1940 and 2025, the highest apparent temperature reached 42.7 °C on 28 June 2021, and the lowest was -22.5 °C on 31 January 1950.
Compare Spanaway with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Spanaway