Dej climate — normals and trends
Dej (Romania) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.5 °C and it receives 817 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 (19.2 °C on average) and the coldest is January (-3.9 °C). Rainfall peaks in June.
Dej averages 112 frost days, 6 hot days (≥ 30 °C) and 141 rainy days per year.
Dej has warmed by +2.5 °C between 1940 and 2025, or +0.30 °C per decade. This trend is statistically significant.
The number of frost days there went from about 129 to 95 per year over the period.
The hottest day of the period reached 36.1 °C (on 24 July 2007) and the coldest -31.1 °C (on 23 January 1963).
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
DejCluj County
- coords
- 47.15°, 23.87°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.5°C
Average daily high
13.1°C
Average daily low
4.4°C
Annual rainfall
817mm
Sunshine / day
8.5h
Mean relative humidity
78%
Average peak wind
12.9km/h
Seasonal range
23.1°C
Frost days (< 0 °C)
112 d/yr
Hot days (≥ 30 °C)
6 d/yr
Rainy days (≥ 1 mm)
141 d/yr
Annual snowfall
79.4 cm
Average feels-like high
11.4 °C
Average feels-like low
2.0 °C
Average peak gust
28.7 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
+2.5 °C
since 1940
+0.3 °C per decade · r² = 0.54 · 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
36.1 °C
24 July 2007
Coldest day
-31.1 °C
23 January 1963
Wettest day
57 mm
12 June 1974
Windiest day
42.9 km/h
18 February 1946
Strongest gust
92.5 km/h
18 February 1946
Hottest feels-like
38.5 °C
6 July 1988
Coldest feels-like
-35.9 °C
23 January 1963
Snowiest day
12.7 cm
21 January 2000
Sunniest day
15.0 h
23 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 | 3.9 °C | +4.7 °C | 45 mm | -5 mm |
| Feb | 3.7 °C | +1.8 °C | 18 mm | -32 mm |
| Mar | 13.0 °C | +5.1 °C | 72 mm | +18 mm |
| Apr | 16.1 °C | +1.6 °C | 35 mm | -37 mm |
| May | 16.4 °C | -3.0 °C | 138 mm | +45 mm |
| Jun | 26.2 °C | +3.7 °C | 35 mm | -71 mm |
| Jul | 26.2 °C | +1.8 °C | 143 mm | +51 mm |
| Aug | 26.1 °C | +1.6 °C | 81 mm | +10 mm |
| Sep | 21.9 °C | +1.8 °C | 94 mm | +35 mm |
| Oct | 12.2 °C | -1.9 °C | 53 mm | -1 mm |
| Nov | 9.8 °C | +2.8 °C | 62 mm | +4 mm |
| Dec | 4.5 °C | +3.3 °C | 5 mm | -55 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 Dej?
Dej has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 8.5 °C and it receives 817 mm of precipitation per year.
What is the hottest day ever recorded in Dej?
The hottest day measured in Dej between 1940 and 2025 was 24 July 2007, reaching 36.1 °C.
What is the coldest day in Dej?
The coldest day measured in Dej between 1940 and 2025 was 23 January 1963, at -31.1 °C.
Does it snow in Dej?
Yes. Dej gets on average 79.4 cm of snow per year and has around 112 frost days.
Has the climate of Dej warmed?
Yes: Dej warmed by +2.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Dej?
The wettest day measured in Dej between 1940 and 2025 was 12 June 1974, with 57 mm of rain in 24 hours.
What was the windiest day in Dej?
The windiest day measured in Dej between 1940 and 2025 was 18 February 1946, with winds reaching 42.9 km/h.
What is the warmest month in Dej?
The warmest month in Dej is July (19.2 °C on average); the coldest is January (-3.9 °C).
How much does it rain in Dej?
Dej receives on average 817 mm of precipitation per year, spread over about 141 rainy days.
Is it sunny in Dej?
Dej 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 Dej?
The heaviest 24-hour snowfall measured in Dej between 1940 and 2025 was 21 January 2000, with 12.7 cm.
Are there tropical nights in Dej?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Dej.
What was the most extreme apparent temperature in Dej?
In Dej, between 1940 and 2025, the highest apparent temperature reached 38.5 °C on 6 July 1988, and the lowest was -35.9 °C on 23 January 1963.
Compare Dej with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Dej