Climate Insights for Alta Sierra

The climate in Alta Sierra is temperate. The average annual temperature is 13°C and approximately 434mm of precipitation falls per year. January is the wettest month, receiving around 113mm of rainfall. Alta Sierra 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 -1°C. Snowfall occurs from January to December, with around 114cm accumulating over the season.

Temperatures in Alta Sierra vary considerably across the year, with a 32°C difference between the coldest and warmest months. The warmest month is July, when average highs reach 31°C and the mean temperature sits around 24°C. The coldest month is January, when overnight lows fall to -1°C and the daily average is 3°C. On average, daily temperatures fluctuate by about 13°C between overnight lows and afternoon highs. The sharpest temperature change occurs between May and June, with a 8°C shift in average temperatures.

Alta Sierra is a relatively dry area, receiving approximately 434mm of precipitation annually, which averages out to around 36mm per month. The wettest month is January, averaging 113mm of rainfall. December and March also tend to see above-average precipitation. The driest month is July, with just 1mm. That's 113mm less than January, 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 114cm accumulating over the season. January typically sees the most snow at around 47cm.

Alta Sierra is relatively calm, with an average annual wind speed of 2km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is July, averaging 2km/h, though still comfortable for most outdoor activities. The calmest conditions occur in February, with average winds dropping to 1km/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.

It is currently summer in Alta Sierra, which began on June 21, 2026. Alta Sierra 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 31°C, while the coldest stretch bottoms out in January near -1°C. Autumn is next, beginning on September 23, 2026 — 52 days from now.

The best time to visit Alta Sierra is during June, July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 22°C with modest rainfall averaging 3mm per month. By contrast, January can be quite cold with temperatures dropping to -1°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Alta Sierra 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.