Arenzano climate — normals and trends
Arenzano (Italy) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 12.2 °C and it receives 1,133 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 (21.3 °C on average) and the coldest is January (3.2 °C). Rainfall peaks in November.
Arenzano averages 28 frost days, 2 hot days (≥ 30 °C) and 123 rainy days per year.
Arenzano 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 45 to 11 per year over the period.
The hottest day of the period reached 34.7 °C (on 22 August 2023) and the coldest -16.0 °C (on 20 January 1940).
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
ArenzanoLiguria
- coords
- 44.41°, 8.68°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
12.2°C
Average daily high
15.6°C
Average daily low
9.3°C
Annual rainfall
1,133mm
Sunshine / day
9.1h
Mean relative humidity
77%
Average peak wind
13.3km/h
Seasonal range
18.1°C
Frost days (< 0 °C)
28 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
123 d/yr
Annual snowfall
55.7 cm
Average feels-like high
14.6 °C
Average feels-like low
7.5 °C
Average peak gust
33.3 km/h
Tropical nights (≥ 20 °C)
10 d/yr
Solar radiation
13.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.5 °C
since 1940
+0.3 °C per decade · r² = 0.66 · 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
34.7 °C
22 August 2023
Coldest day
-16.0 °C
20 January 1940
Wettest day
136 mm
2 November 1968
Windiest day
42.7 km/h
2 October 2020
Strongest gust
110.9 km/h
29 October 2018
Hottest feels-like
39.2 °C
28 June 2019
Coldest feels-like
-21.7 °C
20 January 1940
Snowiest day
40.9 cm
17 February 1967
Sunniest day
15.0 h
3 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 | 8.0 °C | +1.9 °C | 202 mm | +113 mm |
| Feb | 8.8 °C | +0.9 °C | 70 mm | -13 mm |
| Mar | 12.8 °C | +1.4 °C | 164 mm | +68 mm |
| Apr | 16.1 °C | +1.5 °C | 115 mm | +15 mm |
| May | 19.0 °C | +0.8 °C | 94 mm | +7 mm |
| Jun | 26.1 °C | +4.0 °C | 27 mm | -38 mm |
| Jul | 25.6 °C | +0.4 °C | 81 mm | +38 mm |
| Aug | 26.8 °C | +1.7 °C | 148 mm | +78 mm |
| Sep | 21.8 °C | +0.2 °C | 103 mm | +8 mm |
| Oct | 17.5 °C | +0.9 °C | 92 mm | -57 mm |
| Nov | 11.9 °C | +1.0 °C | 140 mm | -14 mm |
| Dec | 9.6 °C | +2.4 °C | 152 mm | +50 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 Arenzano?
Arenzano has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 12.2 °C and it receives 1,133 mm of precipitation per year.
What is the hottest day ever recorded in Arenzano?
The hottest day measured in Arenzano between 1940 and 2025 was 22 August 2023, reaching 34.7 °C.
What is the coldest day in Arenzano?
The coldest day measured in Arenzano between 1940 and 2025 was 20 January 1940, at -16.0 °C.
Does it snow in Arenzano?
Yes. Arenzano gets on average 55.7 cm of snow per year and has around 28 frost days.
Has the climate of Arenzano warmed?
Yes: Arenzano warmed by +2.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Arenzano?
The wettest day measured in Arenzano between 1940 and 2025 was 2 November 1968, with 136 mm of rain in 24 hours.
What was the windiest day in Arenzano?
The windiest day measured in Arenzano between 1940 and 2025 was 2 October 2020, with winds reaching 42.7 km/h.
What is the warmest month in Arenzano?
The warmest month in Arenzano is July (21.3 °C on average); the coldest is January (3.2 °C).
How much does it rain in Arenzano?
Arenzano receives on average 1,133 mm of precipitation per year, spread over about 123 rainy days.
Is it sunny in Arenzano?
Arenzano 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 Arenzano?
The heaviest 24-hour snowfall measured in Arenzano between 1940 and 2025 was 17 February 1967, with 40.9 cm.
Are there tropical nights in Arenzano?
Yes: Arenzano has on average 10 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Arenzano?
In Arenzano, between 1940 and 2025, the highest apparent temperature reached 39.2 °C on 28 June 2019, and the lowest was -21.7 °C on 20 January 1940.
Compare Arenzano with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Arenzano