Ascona climate — normals and trends
Ascona (Switzerland) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 5.7 °C and it receives 1,585 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 (15.4 °C on average) and the coldest is January (-3.9 °C). Rainfall peaks in May.
Ascona averages 152 frost days, 0 hot days (≥ 30 °C) and 156 rainy days per year.
Ascona has warmed by +3.1 °C between 1940 and 2025, or +0.36 °C per decade. This trend is statistically significant.
The number of frost days there went from about 183 to 121 per year over the period.
The hottest day of the period reached 33.5 °C (on 27 June 2019) and the coldest -25.8 °C (on 14 February 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
AsconaCanton Ticino
- coords
- 46.15°, 8.77°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
5.7°C
Average daily high
9.9°C
Average daily low
1.7°C
Annual rainfall
1,585mm
Sunshine / day
8.9h
Mean relative humidity
75%
Average peak wind
7.7km/h
Seasonal range
19.3°C
Frost days (< 0 °C)
152 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
156 d/yr
Annual snowfall
271.0 cm
Average feels-like high
8.2 °C
Average feels-like low
-1.2 °C
Average peak gust
36.6 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
13.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+3.1 °C
since 1940
+0.4 °C per decade · r² = 0.69 · 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
33.5 °C
27 June 2019
Coldest day
-25.8 °C
14 February 1940
Wettest day
156 mm
28 August 2025
Windiest day
19.8 km/h
8 April 1943
Strongest gust
123.1 km/h
28 March 1995
Hottest feels-like
34.0 °C
27 June 2019
Coldest feels-like
-31.3 °C
14 February 1940
Snowiest day
51.7 cm
31 March 1992
Sunniest day
15.0 h
2 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 | 3.1 °C | +3.3 °C | 125 mm | +55 mm |
| Feb | 4.1 °C | +2.3 °C | 41 mm | -33 mm |
| Mar | 7.9 °C | +2.8 °C | 113 mm | +14 mm |
| Apr | 12.8 °C | +4.0 °C | 197 mm | +53 mm |
| May | 15.2 °C | +1.5 °C | 174 mm | -1 mm |
| Jun | 21.7 °C | +3.9 °C | 203 mm | +41 mm |
| Jul | 20.5 °C | +0.3 °C | 207 mm | +69 mm |
| Aug | 21.2 °C | +1.8 °C | 292 mm | +129 mm |
| Sep | 16.0 °C | +0.1 °C | 212 mm | +48 mm |
| Oct | 11.7 °C | +0.8 °C | 88 mm | -83 mm |
| Nov | 6.8 °C | +2.1 °C | 78 mm | -67 mm |
| Dec | 5.2 °C | +4.5 °C | 44 mm | -37 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 Ascona?
Ascona has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 5.7 °C and it receives 1,585 mm of precipitation per year.
What is the hottest day ever recorded in Ascona?
The hottest day measured in Ascona between 1940 and 2025 was 27 June 2019, reaching 33.5 °C.
What is the coldest day in Ascona?
The coldest day measured in Ascona between 1940 and 2025 was 14 February 1940, at -25.8 °C.
Does it snow in Ascona?
Yes. Ascona gets on average 271.0 cm of snow per year and has around 152 frost days.
Has the climate of Ascona warmed?
Yes: Ascona warmed by +3.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Ascona?
The wettest day measured in Ascona between 1940 and 2025 was 28 August 2025, with 156 mm of rain in 24 hours.
What was the windiest day in Ascona?
The windiest day measured in Ascona between 1940 and 2025 was 8 April 1943, with winds reaching 19.8 km/h.
What is the warmest month in Ascona?
The warmest month in Ascona is July (15.4 °C on average); the coldest is January (-3.9 °C).
How much does it rain in Ascona?
Ascona receives on average 1,585 mm of precipitation per year, spread over about 156 rainy days.
Is it sunny in Ascona?
Ascona gets on average 8.9 hours of sunshine per day, roughly 3,249 hours per year over 1940-2025.
What is the biggest single-day snowfall in Ascona?
The heaviest 24-hour snowfall measured in Ascona between 1940 and 2025 was 31 March 1992, with 51.7 cm.
Are there tropical nights in Ascona?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Ascona.
What was the most extreme apparent temperature in Ascona?
In Ascona, between 1940 and 2025, the highest apparent temperature reached 34.0 °C on 27 June 2019, and the lowest was -31.3 °C on 14 February 1940.
Compare Ascona with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Ascona