Climate Insights for Alta

The climate in Alta is temperate. The average annual temperature is 10°C and approximately 1064mm of precipitation falls per year. September is the wettest month, receiving around 211mm of rainfall. Alta is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: June, July, August. The coldest months are January, December, February, when temperatures can drop to -11°C. Snowfall occurs from January to December, with around 121cm accumulating over the season.

Alta has a wide annual temperature range, spanning 40°C from the coldest to warmest months. The warmest month is June, when average highs reach 29°C and the mean temperature sits around 23°C. The coldest month is January, when overnight lows fall to -11°C and the daily average is -8°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between November and December, with a 12°C shift in average temperatures.

Alta is a moderately rainy area, receiving approximately 1064mm of precipitation annually, which averages out to around 89mm per month. The wettest month is September, averaging 211mm of rainfall. August and April also tend to see above-average precipitation. The driest month is January, with just 24mm. That's 188mm less than September, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic. Snowfall is a regular feature from January to December, with around 121cm accumulating over the season. February typically sees the most snow at around 39cm.

Alta 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 April, averaging 6km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 3km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 3km/h gap between the calmest and windiest months.

It is currently summer in Alta, which began on June 21, 2026. Alta 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 June at around 29°C, while the coldest stretch bottoms out in January near -11°C. Autumn is next, beginning on September 23, 2026 — 52 days from now.

The best time to visit Alta is during June and July, when the weather is most comfortable for travellers. During these months, average temperatures hover around 23°C with modest rainfall averaging 60mm per month. By contrast, January can be quite cold with temperatures dropping to -11°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Alta 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.