Climate Insights for Sion

The climate in Sion is cool. The average annual temperature is 4°C and approximately 1,763 mm of precipitation falls per year. Sion receives a notable amount of rainfall throughout the year, including during its driest month. Sion 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 -11°C. Sion experiences heavy snowfall, typically from January through December.The climate in Sion is cool. The average annual temperature is 40°F and approximately 69.4 in of precipitation falls per year. Sion receives a notable amount of rainfall throughout the year, including during its driest month. Sion 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°F. Sion experiences heavy snowfall, typically from January through December.

Temperatures in Sion vary considerably across the year, with a 31°C difference between the coldest and warmest months. July is the warmest month, though highs remain moderate at 20°C with a mean of 14°C. The coldest month is January, when overnight lows fall to -11°C and the daily average is -7°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 7°C shift in average temperatures.Temperatures in Sion vary considerably across the year, with a 55°F difference between the coldest and warmest months. July is the warmest month, though highs remain moderate at 67°F with a mean of 58°F. The coldest month is January, when overnight lows fall to 12°F and the daily average is 20°F. On average, daily temperatures fluctuate by about 18°F between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 12°F shift in average temperatures.

Sion is a fairly wet location, receiving approximately 1,763 mm of precipitation annually, which averages out to around 147 mm per month. The wettest month is May, averaging 188 mm of rainfall. July and June also tend to see above-average precipitation. The driest month is February, with just 102 mm. That's 86 mm 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. Sion receives heavy snowfall, accumulating around 698cm annually from January through December. The snowiest month is January, with approximately 141cm. Winter travel should account for significant snow cover.Sion is a fairly wet location, receiving approximately 69.4 in of precipitation annually, which averages out to around 5.8 in per month. The wettest month is May, averaging 7.4 in of rainfall. July and June also tend to see above-average precipitation. The driest month is February, with just 4 in. That's 3.4 in 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. Sion receives heavy snowfall, accumulating around 275in annually from January through December. The snowiest month is January, with approximately 56in. Winter travel should account for significant snow cover.

Sion is relatively calm, with an average annual wind speed of 4km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is December, averaging 5km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, with average winds dropping to 4km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 1km/h gap between the calmest and windiest months.Sion is relatively calm, with an average annual wind speed of 3mph. For context, sustained winds below 7mph are generally light, while anything above 16mph is considered strong. The windiest month is December, averaging 3mph, though still comfortable for most outdoor activities. The calmest conditions occur in September, with average winds dropping to 2mph, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 1mph gap between the calmest and windiest months.

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