Aosta, Italy climate
Cfb Oceanic / temperate
Aosta has a seasonal cool-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is July with an average daily high near 27°C, while the coldest is January averaging around −3°C at night. Around 584 mm of precipitation falls each year, peaking in December (68 mm) and easing off in April (34 mm).
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Aosta climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 5 | 8 | 14 | 18 | 22 | 26 | 27 | 27 | 22 | 17 | 10 | 5 |
| Avg temp (°C) | 1 | 3 | 8 | 12 | 16 | 19 | 21 | 20 | 16 | 11 | 6 | 1 |
| Avg low (°C) | −3 | −2 | 2 | 5 | 9 | 13 | 14 | 14 | 10 | 6 | 1 | −3 |
| Precipitation (mm) | 52 | 40 | 37 | 34 | 52 | 48 | 62 | 60 | 38 | 43 | 50 | 68 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 5 | 8 | 14 | 18 | 22 | 26 |
| Avg temp (°C) | 1 | 3 | 8 | 12 | 16 | 19 |
| Avg low (°C) | −3 | −2 | 2 | 5 | 9 | 13 |
| Precipitation (mm) | 52 | 40 | 37 | 34 | 52 | 48 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 27 | 27 | 22 | 17 | 10 | 5 |
| Avg temp (°C) | 21 | 20 | 16 | 11 | 6 | 1 |
| Avg low (°C) | 14 | 14 | 10 | 6 | 1 | −3 |
| Precipitation (mm) | 62 | 60 | 38 | 43 | 50 | 68 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 9 | 7 | 8 | 8 | 11 | 11 | 11 | 11 | 8 | 9 | 9 | 9 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.0 | 2 | 4 | 3 | 0.1 | — | — | — |
| Days with low ≤ 0°C (days) | 25 | 21 | 10 | 1 | 0.0 | — | — | — | — | 2 | 12 | 24 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 9 | 7 | 8 | 8 | 11 | 11 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.0 | 2 |
| Days with low ≤ 0°C (days) | 25 | 21 | 10 | 1 | 0.0 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 11 | 11 | 8 | 9 | 9 | 9 |
| Days with high ≥ 32°C (days) | 4 | 3 | 0.1 | — | — | — |
| Days with low ≤ 0°C (days) | — | — | — | 2 | 12 | 24 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 68 | 69 | 68 | 69 | 72 | 65 | 59 | 59 | 61 | 66 | 71 | 71 |
| Relative humidity (%) | 83 | 83 | 86 | 82 | 78 | 75 | 74 | 75 | 78 | 80 | 85 | 83 |
| Wind speed (km/h) | 5.9 | 6.0 | 6.2 | 6.1 | 5.8 | 5.5 | 5.5 | 5.0 | 5.0 | 5.2 | 5.5 | 5.8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 68 | 69 | 68 | 69 | 72 | 65 |
| Relative humidity (%) | 83 | 83 | 86 | 82 | 78 | 75 |
| Wind speed (km/h) | 5.9 | 6.0 | 6.2 | 6.1 | 5.8 | 5.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 59 | 59 | 61 | 66 | 71 | 71 |
| Relative humidity (%) | 74 | 75 | 78 | 80 | 85 | 83 |
| Wind speed (km/h) | 5.5 | 5.0 | 5.0 | 5.2 | 5.5 | 5.8 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Sion 2, a weather station, about 53 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.