Blaj climate — normals and trends
Blaj (Romania) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 10.1 °C and it receives 559 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 (21.0 °C on average) and the coldest is January (-2.4 °C). Rainfall peaks in June.
Blaj averages 101 frost days, 20 hot days (≥ 30 °C) and 106 rainy days per year.
Blaj has warmed by +2.2 °C between 1940 and 2025, or +0.26 °C per decade. This trend is statistically significant.
The number of frost days there went from about 114 to 88 per year over the period.
The hottest day of the period reached 40.1 °C (on 16 July 2024) and the coldest -31.5 °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
BlajAlba County
- coords
- 46.18°, 23.92°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.1°C
Average daily high
15.2°C
Average daily low
5.5°C
Annual rainfall
559mm
Sunshine / day
9.0h
Mean relative humidity
74%
Average peak wind
11.6km/h
Seasonal range
23.4°C
Frost days (< 0 °C)
101 d/yr
Hot days (≥ 30 °C)
20 d/yr
Rainy days (≥ 1 mm)
106 d/yr
Annual snowfall
37.7 cm
Average feels-like high
13.7 °C
Average feels-like low
3.5 °C
Average peak gust
25.3 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
13.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.2 °C
since 1940
+0.3 °C per decade · r² = 0.42 · 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
40.1 °C
16 July 2024
Coldest day
-31.5 °C
23 January 1963
Wettest day
61 mm
17 September 1955
Windiest day
35.9 km/h
22 December 1947
Strongest gust
78.1 km/h
18 February 1946
Hottest feels-like
40.4 °C
21 July 1987
Coldest feels-like
-36.4 °C
23 January 1963
Snowiest day
15.3 cm
13 December 1981
Sunniest day
15.0 h
3 July 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 | 6.4 °C | +5.1 °C | 14 mm | -13 mm |
| Feb | 5.7 °C | +1.2 °C | 10 mm | -17 mm |
| Mar | 15.3 °C | +5.0 °C | 51 mm | +18 mm |
| Apr | 18.3 °C | +1.9 °C | 41 mm | -15 mm |
| May | 19.1 °C | -2.2 °C | 81 mm | +9 mm |
| Jun | 30.2 °C | +5.5 °C | 18 mm | -62 mm |
| Jul | 30.3 °C | +3.6 °C | 78 mm | +7 mm |
| Aug | 30.0 °C | +3.1 °C | 64 mm | +10 mm |
| Sep | 25.2 °C | +2.7 °C | 43 mm | +2 mm |
| Oct | 14.3 °C | -1.9 °C | 64 mm | +28 mm |
| Nov | 12.3 °C | +3.4 °C | 58 mm | +24 mm |
| Dec | 6.2 °C | +3.0 °C | 5 mm | -27 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 Blaj?
Blaj has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 10.1 °C and it receives 559 mm of precipitation per year.
What is the hottest day ever recorded in Blaj?
The hottest day measured in Blaj between 1940 and 2025 was 16 July 2024, reaching 40.1 °C.
What is the coldest day in Blaj?
The coldest day measured in Blaj between 1940 and 2025 was 23 January 1963, at -31.5 °C.
Does it snow in Blaj?
Yes. Blaj gets on average 37.7 cm of snow per year and has around 101 frost days.
Has the climate of Blaj warmed?
Yes: Blaj warmed by +2.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Blaj?
The wettest day measured in Blaj between 1940 and 2025 was 17 September 1955, with 61 mm of rain in 24 hours.
What was the windiest day in Blaj?
The windiest day measured in Blaj between 1940 and 2025 was 22 December 1947, with winds reaching 35.9 km/h.
What is the warmest month in Blaj?
The warmest month in Blaj is July (21.0 °C on average); the coldest is January (-2.4 °C).
How much does it rain in Blaj?
Blaj receives on average 559 mm of precipitation per year, spread over about 106 rainy days.
Is it sunny in Blaj?
Blaj gets on average 9.0 hours of sunshine per day, roughly 3,285 hours per year over 1940-2025.
What is the biggest single-day snowfall in Blaj?
The heaviest 24-hour snowfall measured in Blaj between 1940 and 2025 was 13 December 1981, with 15.3 cm.
Are there tropical nights in Blaj?
Yes: Blaj has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Blaj?
In Blaj, between 1940 and 2025, the highest apparent temperature reached 40.4 °C on 21 July 1987, and the lowest was -36.4 °C on 23 January 1963.
Compare Blaj with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Blaj