Siderno climate — normals and trends
Siderno (Italy) has a hot-summer mediterranean climate (Csa) under the Köppen-Geiger classification. Its mean annual temperature is 16.0 °C and it receives 816 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 August (24.1 °C on average) and the coldest is January (9.3 °C). Rainfall peaks in October.
Siderno averages 0 frost days, 7 hot days (≥ 30 °C) and 110 rainy days per year.
Siderno has warmed by +1.1 °C between 1940 and 2025, or +0.13 °C per decade. This trend is statistically significant.
The hottest day of the period reached 38.3 °C (on 25 July 2023) and the coldest -1.6 °C (on 25 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
SidernoCalabria
- coords
- 38.27°, 16.30°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.0°C
Average daily high
18.7°C
Average daily low
13.6°C
Annual rainfall
816mm
Sunshine / day
10.7h
Mean relative humidity
77%
Average peak wind
14.7km/h
Seasonal range
14.8°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
7 d/yr
Rainy days (≥ 1 mm)
110 d/yr
Annual snowfall
2.5 cm
Average feels-like high
18.9 °C
Average feels-like low
12.5 °C
Average peak gust
33.1 km/h
Tropical nights (≥ 20 °C)
60 d/yr
Solar radiation
17.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.1 °C
since 1940
+0.1 °C per decade · r² = 0.33 · 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
38.3 °C
25 July 2023
Coldest day
-1.6 °C
25 January 1963
Wettest day
132 mm
25 October 2021
Windiest day
50.6 km/h
28 February 1990
Strongest gust
111.6 km/h
1 January 1980
Hottest feels-like
40.9 °C
23 July 2023
Coldest feels-like
-7.7 °C
14 January 1968
Snowiest day
8.5 cm
6 February 2012
Sunniest day
14.0 h
20 May 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 | 14.0 °C | +2.4 °C | 169 mm | +60 mm |
| Feb | 12.8 °C | +0.9 °C | 76 mm | -9 mm |
| Mar | 14.7 °C | +1.3 °C | 138 mm | +49 mm |
| Apr | 16.6 °C | +0.8 °C | 30 mm | -31 mm |
| May | 20.7 °C | +1.0 °C | 81 mm | +47 mm |
| Jun | 27.1 °C | +3.1 °C | 3 mm | -11 mm |
| Jul | 29.2 °C | +2.3 °C | 6 mm | -3 mm |
| Aug | 27.8 °C | +0.5 °C | 12 mm | -4 mm |
| Sep | 25.9 °C | +1.7 °C | 100 mm | +40 mm |
| Oct | 20.0 °C | -0.3 °C | 115 mm | -1 mm |
| Nov | 17.4 °C | +1.1 °C | 70 mm | -42 mm |
| Dec | 14.5 °C | +1.6 °C | 68 mm | -43 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 Siderno?
Siderno has a hot-summer mediterranean climate (Köppen Csa). Over 1940-2025, the average annual temperature is 16.0 °C and it receives 816 mm of precipitation per year.
What is the hottest day ever recorded in Siderno?
The hottest day measured in Siderno between 1940 and 2025 was 25 July 2023, reaching 38.3 °C.
What is the coldest day in Siderno?
The coldest day measured in Siderno between 1940 and 2025 was 25 January 1963, at -1.6 °C.
Does it snow in Siderno?
Yes. Siderno gets on average 2.5 cm of snow per year and has around 0 frost days.
Has the climate of Siderno warmed?
Yes: Siderno warmed by +1.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Siderno?
The wettest day measured in Siderno between 1940 and 2025 was 25 October 2021, with 132 mm of rain in 24 hours.
What was the windiest day in Siderno?
The windiest day measured in Siderno between 1940 and 2025 was 28 February 1990, with winds reaching 50.6 km/h.
What is the warmest month in Siderno?
The warmest month in Siderno is August (24.1 °C on average); the coldest is January (9.3 °C).
How much does it rain in Siderno?
Siderno receives on average 816 mm of precipitation per year, spread over about 110 rainy days.
Is it sunny in Siderno?
Siderno gets on average 10.7 hours of sunshine per day, roughly 3,905 hours per year over 1940-2025.
What is the biggest single-day snowfall in Siderno?
The heaviest 24-hour snowfall measured in Siderno between 1940 and 2025 was 6 February 2012, with 8.5 cm.
Are there tropical nights in Siderno?
Yes: Siderno has on average 60 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Siderno?
In Siderno, between 1940 and 2025, the highest apparent temperature reached 40.9 °C on 23 July 2023, and the lowest was -7.7 °C on 14 January 1968.
Compare Siderno with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Siderno