Duncan climate — normals and trends
Duncan (Canada) has a warm-summer mediterranean climate (Csb) under the Köppen-Geiger classification. Its mean annual temperature is 8.8 °C and it receives 1,489 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 (17.3 °C on average) and the coldest is January (1.3 °C). Rainfall peaks in December.
Duncan averages 70 frost days, 5 hot days (≥ 30 °C) and 159 rainy days per year.
Duncan has warmed by +2.0 °C between 1940 and 2025, or +0.24 °C per decade. This trend is statistically significant.
The number of frost days there went from about 99 to 41 per year over the period.
The hottest day of the period reached 40.8 °C (on 28 June 2021) and the coldest -21.9 °C (on 25 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
DuncanBritish Columbia
- coords
- 48.78°, -123.70°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.8°C
Average daily high
12.9°C
Average daily low
5.1°C
Annual rainfall
1,489mm
Sunshine / day
8.4h
Mean relative humidity
79%
Average peak wind
9.7km/h
Seasonal range
16.0°C
Frost days (< 0 °C)
70 d/yr
Hot days (≥ 30 °C)
5 d/yr
Rainy days (≥ 1 mm)
159 d/yr
Annual snowfall
138.3 cm
Average feels-like high
11.3 °C
Average feels-like low
2.9 °C
Average peak gust
30.8 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
13.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.0 °C
since 1940
+0.2 °C per decade · r² = 0.46 · 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
40.8 °C
28 June 2021
Coldest day
-21.9 °C
25 January 1950
Wettest day
88 mm
16 October 2003
Windiest day
38.1 km/h
13 February 1979
Strongest gust
118.1 km/h
15 November 2006
Hottest feels-like
41.9 °C
28 June 2021
Coldest feels-like
-26.0 °C
25 January 1950
Snowiest day
47.2 cm
1 January 1965
Sunniest day
15.7 h
20 June 2024
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 | 5.6 °C | +1.5 °C | 59 mm | -149 mm |
| Feb | 4.5 °C | -1.5 °C | 133 mm | -24 mm |
| Mar | 9.1 °C | +0.9 °C | 220 mm | +67 mm |
| Apr | 14.0 °C | +2.3 °C | 52 mm | -55 mm |
| May | 16.2 °C | +0.2 °C | 69 mm | -7 mm |
| Jun | 20.2 °C | +1.2 °C | 20 mm | -37 mm |
| Jul | 24.4 °C | +1.7 °C | 4 mm | -29 mm |
| Aug | 24.4 °C | +1.7 °C | 36 mm | -5 mm |
| Sep | 20.9 °C | +1.6 °C | 50 mm | -18 mm |
| Oct | 12.8 °C | -0.2 °C | 176 mm | +21 mm |
| Nov | 8.8 °C | +1.4 °C | 161 mm | -53 mm |
| Dec | 7.0 °C | +2.6 °C | 279 mm | +58 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 Duncan?
Duncan has a warm-summer mediterranean climate (Köppen Csb). Over 1940-2025, the average annual temperature is 8.8 °C and it receives 1,489 mm of precipitation per year.
What is the hottest day ever recorded in Duncan?
The hottest day measured in Duncan between 1940 and 2025 was 28 June 2021, reaching 40.8 °C.
What is the coldest day in Duncan?
The coldest day measured in Duncan between 1940 and 2025 was 25 January 1950, at -21.9 °C.
Does it snow in Duncan?
Yes. Duncan gets on average 138.3 cm of snow per year and has around 70 frost days.
Has the climate of Duncan warmed?
Yes: Duncan warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Duncan?
The wettest day measured in Duncan between 1940 and 2025 was 16 October 2003, with 88 mm of rain in 24 hours.
What was the windiest day in Duncan?
The windiest day measured in Duncan between 1940 and 2025 was 13 February 1979, with winds reaching 38.1 km/h.
What is the warmest month in Duncan?
The warmest month in Duncan is July (17.3 °C on average); the coldest is January (1.3 °C).
How much does it rain in Duncan?
Duncan receives on average 1,489 mm of precipitation per year, spread over about 159 rainy days.
Is it sunny in Duncan?
Duncan 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 Duncan?
The heaviest 24-hour snowfall measured in Duncan between 1940 and 2025 was 1 January 1965, with 47.2 cm.
Are there tropical nights in Duncan?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Duncan.
What was the most extreme apparent temperature in Duncan?
In Duncan, between 1940 and 2025, the highest apparent temperature reached 41.9 °C on 28 June 2021, and the lowest was -26.0 °C on 25 January 1950.
Compare Duncan with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Duncan