Castel Bolognese climate — normals and trends
Castel Bolognese (Italy) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 13.4 °C and it receives 888 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 (23.7 °C on average) and the coldest is January (3.4 °C). Rainfall peaks in November.
Castel Bolognese averages 41 frost days, 34 hot days (≥ 30 °C) and 112 rainy days per year.
Castel Bolognese 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 58 to 24 per year over the period.
The hottest day of the period reached 39.4 °C (on 2 August 2017) and the coldest -21.3 °C (on 24 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
Castel BologneseEmilia-Romagna
- coords
- 44.32°, 11.80°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
13.4°C
Average daily high
18.0°C
Average daily low
9.2°C
Annual rainfall
888mm
Sunshine / day
9.4h
Mean relative humidity
73%
Average peak wind
12.9km/h
Seasonal range
20.3°C
Frost days (< 0 °C)
41 d/yr
Hot days (≥ 30 °C)
34 d/yr
Rainy days (≥ 1 mm)
112 d/yr
Annual snowfall
44.5 cm
Average feels-like high
17.0 °C
Average feels-like low
7.6 °C
Average peak gust
29.6 km/h
Tropical nights (≥ 20 °C)
19 d/yr
Solar radiation
14.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.2 °C
since 1940
+0.3 °C per decade · r² = 0.57 · 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
39.4 °C
2 August 2017
Coldest day
-21.3 °C
24 January 1942
Wettest day
109 mm
2 September 1989
Windiest day
45.9 km/h
27 February 1990
Strongest gust
100.4 km/h
26 December 1999
Hottest feels-like
41.5 °C
3 August 2017
Coldest feels-like
-26.1 °C
15 February 1940
Snowiest day
29.5 cm
1 February 2012
Sunniest day
14.9 h
29 June 2025
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 | 8.8 °C | +1.9 °C | 30 mm | -33 mm |
| Feb | 9.1 °C | +0.1 °C | 100 mm | +33 mm |
| Mar | 13.8 °C | +0.8 °C | 122 mm | +51 mm |
| Apr | 18.0 °C | +1.1 °C | 83 mm | -2 mm |
| May | 21.7 °C | +0.1 °C | 66 mm | -18 mm |
| Jun | 29.9 °C | +3.7 °C | 63 mm | -6 mm |
| Jul | 29.3 °C | +0.1 °C | 118 mm | +60 mm |
| Aug | 28.9 °C | 0.0 °C | 74 mm | +9 mm |
| Sep | 25.1 °C | +0.6 °C | 62 mm | -13 mm |
| Oct | 18.5 °C | -0.1 °C | 62 mm | -22 mm |
| Nov | 12.6 °C | +0.1 °C | 79 mm | -11 mm |
| Dec | 9.3 °C | +1.2 °C | 82 mm | +6 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 Castel Bolognese?
Castel Bolognese has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 13.4 °C and it receives 888 mm of precipitation per year.
What is the hottest day ever recorded in Castel Bolognese?
The hottest day measured in Castel Bolognese between 1940 and 2025 was 2 August 2017, reaching 39.4 °C.
What is the coldest day in Castel Bolognese?
The coldest day measured in Castel Bolognese between 1940 and 2025 was 24 January 1942, at -21.3 °C.
Does it snow in Castel Bolognese?
Yes. Castel Bolognese gets on average 44.5 cm of snow per year and has around 41 frost days.
Has the climate of Castel Bolognese warmed?
Yes: Castel Bolognese warmed by +2.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Castel Bolognese?
The wettest day measured in Castel Bolognese between 1940 and 2025 was 2 September 1989, with 109 mm of rain in 24 hours.
What was the windiest day in Castel Bolognese?
The windiest day measured in Castel Bolognese between 1940 and 2025 was 27 February 1990, with winds reaching 45.9 km/h.
What is the warmest month in Castel Bolognese?
The warmest month in Castel Bolognese is July (23.7 °C on average); the coldest is January (3.4 °C).
How much does it rain in Castel Bolognese?
Castel Bolognese receives on average 888 mm of precipitation per year, spread over about 112 rainy days.
Is it sunny in Castel Bolognese?
Castel Bolognese gets on average 9.4 hours of sunshine per day, roughly 3,431 hours per year over 1940-2025.
What is the biggest single-day snowfall in Castel Bolognese?
The heaviest 24-hour snowfall measured in Castel Bolognese between 1940 and 2025 was 1 February 2012, with 29.5 cm.
Are there tropical nights in Castel Bolognese?
Yes: Castel Bolognese has on average 19 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Castel Bolognese?
In Castel Bolognese, between 1940 and 2025, the highest apparent temperature reached 41.5 °C on 3 August 2017, and the lowest was -26.1 °C on 15 February 1940.
Compare Castel Bolognese with another city
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Nearby cities
The climate around Castel Bolognese