The Dalles climate — normals and trends
The Dalles (United States) has a warm-summer mediterranean continental climate (Dsb) under the Köppen-Geiger classification. Its mean annual temperature is 9.5 °C and it receives 791 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 (-0.3 °C). Rainfall peaks in December.
The Dalles averages 89 frost days, 27 hot days (≥ 30 °C) and 115 rainy days per year.
The Dalles has warmed by +2.0 °C between 1940 and 2025, or +0.23 °C per decade. This trend is statistically significant.
The number of frost days there went from about 106 to 72 per year over the period.
The hottest day of the period reached 44.7 °C (on 29 June 2021) and the coldest -28.0 °C (on 21 December 1990).
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
The DallesOregon
- coords
- 45.59°, -121.18°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.5°C
Average daily high
14.8°C
Average daily low
4.5°C
Annual rainfall
791mm
Sunshine / day
9.7h
Mean relative humidity
68%
Average peak wind
12.7km/h
Seasonal range
20.5°C
Frost days (< 0 °C)
89 d/yr
Hot days (≥ 30 °C)
27 d/yr
Rainy days (≥ 1 mm)
115 d/yr
Annual snowfall
102.9 cm
Average feels-like high
12.5 °C
Average feels-like low
1.8 °C
Average peak gust
34.8 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
15.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.0 °C
since 1940
+0.2 °C per decade · r² = 0.49 · 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
44.7 °C
29 June 2021
Coldest day
-28.0 °C
21 December 1990
Wettest day
75 mm
22 December 1964
Windiest day
36.1 km/h
17 December 1961
Strongest gust
101.5 km/h
3 November 1958
Hottest feels-like
44.1 °C
29 June 2021
Coldest feels-like
-33.0 °C
21 December 1990
Snowiest day
24.6 cm
27 November 1984
Sunniest day
15.5 h
18 June 1945
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 | 5.5 °C | +2.5 °C | 72 mm | -59 mm |
| Feb | 5.4 °C | -0.5 °C | 112 mm | +17 mm |
| Mar | 11.6 °C | +1.9 °C | 138 mm | +50 mm |
| Apr | 16.3 °C | +2.7 °C | 33 mm | -25 mm |
| May | 19.5 °C | +1.2 °C | 26 mm | -15 mm |
| Jun | 25.2 °C | +2.7 °C | 2 mm | -22 mm |
| Jul | 29.7 °C | +1.9 °C | 8 mm | +1 mm |
| Aug | 29.6 °C | +2.3 °C | 11 mm | -1 mm |
| Sep | 26.3 °C | +3.4 °C | 21 mm | -4 mm |
| Oct | 14.6 °C | -0.9 °C | 57 mm | -4 mm |
| Nov | 9.6 °C | +2.0 °C | 94 mm | -20 mm |
| Dec | 8.2 °C | +4.6 °C | 197 mm | +63 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 The Dalles?
The Dalles has a warm-summer mediterranean continental climate (Köppen Dsb). Over 1940-2025, the average annual temperature is 9.5 °C and it receives 791 mm of precipitation per year.
What is the hottest day ever recorded in The Dalles?
The hottest day measured in The Dalles between 1940 and 2025 was 29 June 2021, reaching 44.7 °C.
What is the coldest day in The Dalles?
The coldest day measured in The Dalles between 1940 and 2025 was 21 December 1990, at -28.0 °C.
Does it snow in The Dalles?
Yes. The Dalles gets on average 102.9 cm of snow per year and has around 89 frost days.
Has the climate of The Dalles warmed?
Yes: The Dalles warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in The Dalles?
The wettest day measured in The Dalles between 1940 and 2025 was 22 December 1964, with 75 mm of rain in 24 hours.
What was the windiest day in The Dalles?
The windiest day measured in The Dalles between 1940 and 2025 was 17 December 1961, with winds reaching 36.1 km/h.
What is the warmest month in The Dalles?
The warmest month in The Dalles is July (20.2 °C on average); the coldest is January (-0.3 °C).
How much does it rain in The Dalles?
The Dalles receives on average 791 mm of precipitation per year, spread over about 115 rainy days.
Is it sunny in The Dalles?
The Dalles gets on average 9.7 hours of sunshine per day, roughly 3,540 hours per year over 1940-2025.
What is the biggest single-day snowfall in The Dalles?
The heaviest 24-hour snowfall measured in The Dalles between 1940 and 2025 was 27 November 1984, with 24.6 cm.
Are there tropical nights in The Dalles?
Yes: The Dalles has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in The Dalles?
In The Dalles, between 1940 and 2025, the highest apparent temperature reached 44.1 °C on 29 June 2021, and the lowest was -33.0 °C on 21 December 1990.
Compare The Dalles with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around The Dalles