Frederickson climate — normals and trends
Frederickson (United States) has a warm-summer mediterranean climate (Csb) under the Köppen-Geiger classification. Its mean annual temperature is 8.9 °C and it receives 1,618 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 (16.4 °C on average) and the coldest is January (2.6 °C). Rainfall peaks in November.
Frederickson averages 61 frost days, 4 hot days (≥ 30 °C) and 167 rainy days per year.
Frederickson has warmed by +1.6 °C between 1940 and 2025, or +0.18 °C per decade. This trend is statistically significant.
The number of frost days there went from about 77 to 45 per year over the period.
The hottest day of the period reached 40.3 °C (on 28 June 2021) and the coldest -22.2 °C (on 8 December 1972).
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
FredericksonWashington
- coords
- 47.10°, -122.36°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.9°C
Average daily high
13.5°C
Average daily low
4.8°C
Annual rainfall
1,618mm
Sunshine / day
8.4h
Mean relative humidity
78%
Average peak wind
12.8km/h
Seasonal range
13.8°C
Frost days (< 0 °C)
61 d/yr
Hot days (≥ 30 °C)
4 d/yr
Rainy days (≥ 1 mm)
167 d/yr
Annual snowfall
110.0 cm
Average feels-like high
11.6 °C
Average feels-like low
2.2 °C
Average peak gust
35.3 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
12.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.6 °C
since 1940
+0.2 °C per decade · r² = 0.40 · 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
40.3 °C
28 June 2021
Coldest day
-22.2 °C
8 December 1972
Wettest day
99 mm
7 January 2009
Windiest day
44.3 km/h
20 January 1993
Strongest gust
130.3 km/h
20 January 1993
Hottest feels-like
44.1 °C
28 June 2021
Coldest feels-like
-27.5 °C
8 December 1972
Snowiest day
36.4 cm
18 November 1946
Sunniest day
15.7 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 | 6.7 °C | +1.0 °C | 83 mm | -140 mm |
| Feb | 6.3 °C | -1.1 °C | 185 mm | +13 mm |
| Mar | 10.6 °C | +1.1 °C | 217 mm | +44 mm |
| Apr | 14.4 °C | +1.9 °C | 95 mm | -37 mm |
| May | 16.5 °C | +0.5 °C | 59 mm | -38 mm |
| Jun | 20.1 °C | +1.5 °C | 19 mm | -55 mm |
| Jul | 23.5 °C | +1.2 °C | 2 mm | -27 mm |
| Aug | 23.3 °C | +1.0 °C | 51 mm | +12 mm |
| Sep | 20.7 °C | +1.3 °C | 33 mm | -44 mm |
| Oct | 13.6 °C | -0.3 °C | 178 mm | +30 mm |
| Nov | 10.5 °C | +2.0 °C | 205 mm | -23 mm |
| Dec | 8.3 °C | +2.6 °C | 429 mm | +203 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 Frederickson?
Frederickson has a warm-summer mediterranean climate (Köppen Csb). Over 1940-2025, the average annual temperature is 8.9 °C and it receives 1,618 mm of precipitation per year.
What is the hottest day ever recorded in Frederickson?
The hottest day measured in Frederickson between 1940 and 2025 was 28 June 2021, reaching 40.3 °C.
What is the coldest day in Frederickson?
The coldest day measured in Frederickson between 1940 and 2025 was 8 December 1972, at -22.2 °C.
Does it snow in Frederickson?
Yes. Frederickson gets on average 110.0 cm of snow per year and has around 61 frost days.
Has the climate of Frederickson warmed?
Yes: Frederickson warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Frederickson?
The wettest day measured in Frederickson between 1940 and 2025 was 7 January 2009, with 99 mm of rain in 24 hours.
What was the windiest day in Frederickson?
The windiest day measured in Frederickson between 1940 and 2025 was 20 January 1993, with winds reaching 44.3 km/h.
What is the warmest month in Frederickson?
The warmest month in Frederickson is July (16.4 °C on average); the coldest is January (2.6 °C).
How much does it rain in Frederickson?
Frederickson receives on average 1,618 mm of precipitation per year, spread over about 167 rainy days.
Is it sunny in Frederickson?
Frederickson 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 Frederickson?
The heaviest 24-hour snowfall measured in Frederickson between 1940 and 2025 was 18 November 1946, with 36.4 cm.
Are there tropical nights in Frederickson?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Frederickson.
What was the most extreme apparent temperature in Frederickson?
In Frederickson, between 1940 and 2025, the highest apparent temperature reached 44.1 °C on 28 June 2021, and the lowest was -27.5 °C on 8 December 1972.
Compare Frederickson with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Frederickson