Climate Insights for Santa Rosa

The climate in Santa Rosa is cold. The average annual temperature is -26°C and approximately 128mm of precipitation falls per year. February is the wettest month, receiving around 28mm of rainfall. Santa Rosa is in the Southern Hemisphere. The seasons are reversed — summer runs from December to February, while winter falls between June and August. The summer months are: November, October, December. The coldest months are August, July, September, when temperatures can drop to -38°C. Snowfall occurs from January to December, with around 129cm accumulating over the season.

Temperatures in Santa Rosa vary considerably across the year, with a 26°C difference between the coldest and warmest months. November is the warmest month, though highs remain moderate at -12°C with a mean of -18°C. August brings the harshest conditions, with lows dropping to -38°C and an average temperature of -33°C. On average, daily temperatures fluctuate by about 9°C between overnight lows and afternoon highs. The sharpest temperature change occurs between September and October, with a 7°C shift in average temperatures.

Santa Rosa is a quite dry location, receiving approximately 128mm of precipitation annually, which averages out to around 11mm per month. The wettest month is February, averaging 28mm of rainfall. November and December also tend to see above-average precipitation. The driest month is April, with just 0mm. That's 28mm less than February, 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 129cm accumulating over the season. February typically sees the most snow at around 28cm.

Santa Rosa is relatively calm, with an average annual wind speed of 9km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is May, averaging 16km/h, though still comfortable for most outdoor activities. The calmest conditions occur in February, with average winds dropping to 3km/h, making it an ideal period for wind-sensitive activities. Wind speeds vary significantly across the year, with a 13km/h difference between the calmest and windiest months. This level of variation is worth factoring into travel plans. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 10km/h in winter, 9km/h in spring, 7km/h in summer, 11km/h in autumn.

It is currently winter in Santa Rosa, which began on June 21, 2026. Santa Rosa is in the Southern Hemisphere, where the seasons are reversed — spring starts in September, summer in December, autumn in March, and winter in June. The warmest period peaks in November at around -12°C, while the coldest stretch bottoms out in August near -38°C. Spring is next, beginning on September 23, 2026 — 16 days from now.

The table below shows monthly climate averages for Santa Rosa 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.