Keizer climate — normals and trends
Keizer (United States) has a warm-summer mediterranean climate (Csb) under the Köppen-Geiger classification. Its mean annual temperature is 11.9 °C and it receives 1,095 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 (20.2 °C on average) and the coldest is January (4.9 °C). Rainfall peaks in December.
Keizer averages 31 frost days, 28 hot days (≥ 30 °C) and 130 rainy days per year.
Keizer has warmed by +1.7 °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 38 to 24 per year over the period.
The hottest day of the period reached 46.4 °C (on 27 June 2021) and the coldest -19.3 °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
KeizerOregon
- coords
- 44.99°, -123.03°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
11.9°C
Average daily high
17.3°C
Average daily low
7.2°C
Annual rainfall
1,095mm
Sunshine / day
8.8h
Mean relative humidity
73%
Average peak wind
14.1km/h
Seasonal range
15.3°C
Frost days (< 0 °C)
31 d/yr
Hot days (≥ 30 °C)
28 d/yr
Rainy days (≥ 1 mm)
130 d/yr
Annual snowfall
10.8 cm
Average feels-like high
15.7 °C
Average feels-like low
5.0 °C
Average peak gust
32.6 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
14.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.7 °C
since 1940
+0.2 °C per decade · r² = 0.46 · 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
46.4 °C
27 June 2021
Coldest day
-19.3 °C
31 January 1950
Wettest day
103 mm
24 November 1960
Windiest day
53.3 km/h
12 October 1962
Strongest gust
116.6 km/h
14 December 2006
Hottest feels-like
48.8 °C
28 June 2021
Coldest feels-like
-23.6 °C
31 January 1950
Snowiest day
13.1 cm
19 February 1993
Sunniest day
15.1 h
18 June 2004
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 | 8.8 °C | +0.6 °C | 96 mm | -72 mm |
| Feb | 9.8 °C | -0.8 °C | 137 mm | +7 mm |
| Mar | 13.7 °C | +0.8 °C | 193 mm | +61 mm |
| Apr | 18.1 °C | +2.5 °C | 48 mm | -37 mm |
| May | 20.5 °C | +1.0 °C | 24 mm | -32 mm |
| Jun | 25.5 °C | +2.4 °C | 17 mm | -15 mm |
| Jul | 30.0 °C | +2.1 °C | 0 mm | -9 mm |
| Aug | 30.2 °C | +2.5 °C | 10 mm | -5 mm |
| Sep | 26.0 °C | +1.6 °C | 31 mm | -5 mm |
| Oct | 17.4 °C | -0.3 °C | 92 mm | -1 mm |
| Nov | 12.7 °C | +1.3 °C | 131 mm | -33 mm |
| Dec | 11.5 °C | +3.2 °C | 210 mm | +32 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 Keizer?
Keizer has a warm-summer mediterranean climate (Köppen Csb). Over 1940-2025, the average annual temperature is 11.9 °C and it receives 1,095 mm of precipitation per year.
What is the hottest day ever recorded in Keizer?
The hottest day measured in Keizer between 1940 and 2025 was 27 June 2021, reaching 46.4 °C.
What is the coldest day in Keizer?
The coldest day measured in Keizer between 1940 and 2025 was 31 January 1950, at -19.3 °C.
Does it snow in Keizer?
Yes. Keizer gets on average 10.8 cm of snow per year and has around 31 frost days.
Has the climate of Keizer warmed?
Yes: Keizer warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Keizer?
The wettest day measured in Keizer between 1940 and 2025 was 24 November 1960, with 103 mm of rain in 24 hours.
What was the windiest day in Keizer?
The windiest day measured in Keizer between 1940 and 2025 was 12 October 1962, with winds reaching 53.3 km/h.
What is the warmest month in Keizer?
The warmest month in Keizer is July (20.2 °C on average); the coldest is January (4.9 °C).
How much does it rain in Keizer?
Keizer receives on average 1,095 mm of precipitation per year, spread over about 130 rainy days.
Is it sunny in Keizer?
Keizer 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 Keizer?
The heaviest 24-hour snowfall measured in Keizer between 1940 and 2025 was 19 February 1993, with 13.1 cm.
Are there tropical nights in Keizer?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Keizer.
What was the most extreme apparent temperature in Keizer?
In Keizer, between 1940 and 2025, the highest apparent temperature reached 48.8 °C on 28 June 2021, and the lowest was -23.6 °C on 31 January 1950.
Compare Keizer with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Keizer