Climate Insights for Aosta

The climate in Aosta is cool. The average annual temperature is 2°C and approximately 1216mm of precipitation falls per year. Aosta receives a notable amount of rainfall throughout the year, including during its driest month. Aosta is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, June. The coldest months are January, December, February, when temperatures can drop to -12°C. Aosta experiences heavy snowfall, typically from January through December.

Temperatures in Aosta vary considerably across the year, with a 30°C difference between the coldest and warmest months. July is the warmest month, though highs remain moderate at 18°C with a mean of 13°C. The coldest month is January, when overnight lows fall to -12°C and the daily average is -8°C. Daily temperature variation is modest, with an average difference of 8°C between highs and lows. The sharpest temperature change occurs between October and November, with a 7°C shift in average temperatures.

Aosta is a fairly wet location, receiving approximately 1216mm of precipitation annually, which averages out to around 101mm per month. The wettest month is May, averaging 131mm of rainfall. December and November also tend to see above-average precipitation. The driest month is September, with just 71mm. That's 60mm less than May, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Aosta receives heavy snowfall, accumulating around 512cm annually from January through December. The snowiest month is December, with approximately 86cm. Winter travel should account for significant snow cover.

Aosta is relatively calm, with an average annual wind speed of 6km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is March, averaging 6km/h, though still comfortable for most outdoor activities. The calmest conditions occur in December, with average winds dropping to 6km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 0km/h between the calmest and windiest months.

It is currently spring in Aosta, which began on March 20, 2026. Aosta is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in July at around 18°C, while the coldest stretch bottoms out in January near -12°C. Summer is next, beginning on June 21, 2026 — 89 days from now.

The table below shows monthly climate averages for Aosta based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.