Castelu climate — normals and trends
Castelu (Romania) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 11.9 °C and it receives 502 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 (23.2 °C on average) and the coldest is January (0.1 °C). Rainfall peaks in June.
Castelu averages 67 frost days, 22 hot days (≥ 30 °C) and 87 rainy days per year.
Castelu has warmed by +1.9 °C between 1940 and 2025, or +0.22 °C per decade. This trend is statistically significant.
The number of frost days there went from about 84 to 50 per year over the period.
The hottest day of the period reached 40.8 °C (on 20 August 1945) and the coldest -26.5 °C (on 25 January 1942).
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
CasteluConstanța County
- coords
- 44.25°, 28.33°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
11.9°C
Average daily high
16.2°C
Average daily low
8.1°C
Annual rainfall
502mm
Sunshine / day
9.1h
Mean relative humidity
75%
Average peak wind
17.5km/h
Seasonal range
23.1°C
Frost days (< 0 °C)
67 d/yr
Hot days (≥ 30 °C)
22 d/yr
Rainy days (≥ 1 mm)
87 d/yr
Annual snowfall
36.9 cm
Average feels-like high
14.4 °C
Average feels-like low
5.9 °C
Average peak gust
33.8 km/h
Tropical nights (≥ 20 °C)
17 d/yr
Solar radiation
14.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.9 °C
since 1940
+0.2 °C per decade · r² = 0.36 · 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
20 August 1945
Coldest day
-26.5 °C
25 January 1942
Wettest day
110 mm
22 September 2005
Windiest day
46.4 km/h
3 December 2012
Strongest gust
88.2 km/h
3 December 2012
Hottest feels-like
43.0 °C
5 July 2000
Coldest feels-like
-31.1 °C
25 January 1942
Snowiest day
20.4 cm
3 January 2008
Sunniest day
14.7 h
2 July 2025
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 9.8 °C | +6.6 °C | 16 mm | -21 mm |
| Feb | 3.3 °C | -2.1 °C | 15 mm | -19 mm |
| Mar | 15.1 °C | +5.5 °C | 14 mm | -25 mm |
| Apr | 15.6 °C | +0.1 °C | 28 mm | -15 mm |
| May | 20.1 °C | -1.0 °C | 64 mm | +8 mm |
| Jun | 28.6 °C | +3.1 °C | 2 mm | -59 mm |
| Jul | 31.6 °C | +3.6 °C | 25 mm | -18 mm |
| Aug | 30.0 °C | +1.9 °C | 4 mm | -30 mm |
| Sep | 24.6 °C | +1.0 °C | 30 mm | -7 mm |
| Oct | 16.9 °C | -0.5 °C | 113 mm | +75 mm |
| Nov | 14.5 °C | +3.5 °C | 63 mm | +21 mm |
| Dec | 6.6 °C | +1.1 °C | 7 mm | -34 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 Castelu?
Castelu has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 11.9 °C and it receives 502 mm of precipitation per year.
What is the hottest day ever recorded in Castelu?
The hottest day measured in Castelu between 1940 and 2025 was 20 August 1945, reaching 40.8 °C.
What is the coldest day in Castelu?
The coldest day measured in Castelu between 1940 and 2025 was 25 January 1942, at -26.5 °C.
Does it snow in Castelu?
Yes. Castelu gets on average 36.9 cm of snow per year and has around 67 frost days.
Has the climate of Castelu warmed?
Yes: Castelu warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Castelu?
The wettest day measured in Castelu between 1940 and 2025 was 22 September 2005, with 110 mm of rain in 24 hours.
What was the windiest day in Castelu?
The windiest day measured in Castelu between 1940 and 2025 was 3 December 2012, with winds reaching 46.4 km/h.
What is the warmest month in Castelu?
The warmest month in Castelu is July (23.2 °C on average); the coldest is January (0.1 °C).
How much does it rain in Castelu?
Castelu receives on average 502 mm of precipitation per year, spread over about 87 rainy days.
Is it sunny in Castelu?
Castelu gets on average 9.1 hours of sunshine per day, roughly 3,322 hours per year over 1940-2025.
What is the biggest single-day snowfall in Castelu?
The heaviest 24-hour snowfall measured in Castelu between 1940 and 2025 was 3 January 2008, with 20.4 cm.
Are there tropical nights in Castelu?
Yes: Castelu has on average 17 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Castelu?
In Castelu, between 1940 and 2025, the highest apparent temperature reached 43.0 °C on 5 July 2000, and the lowest was -31.1 °C on 25 January 1942.
Compare Castelu with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Castelu