Climate Insights for California

The climate in California is temperate. The average annual temperature is 15°C and approximately 1227mm of precipitation falls per year. California receives a notable amount of rainfall throughout the year, including during its driest month. California is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: Luglio, Agosto, Giugno. The coldest months are Gennaio, Febbraio, Dicembre, when temperatures can drop to 2°C. Light snow can occur between January and December.

Temperatures in California vary considerably across the year, with a 27°C difference between the coldest and warmest months. The warmest month is Luglio, when average highs reach 29°C and the mean temperature sits around 27°C. Gennaio is the coolest month, with minimum temperatures around 2°C and an average of 4°C. Daily temperature variation is modest, with an average difference of 5°C between highs and lows. The sharpest temperature change occurs between October and November, with a 6°C shift in average temperatures.

California is a fairly wet location, receiving approximately 1227mm of precipitation annually, which averages out to around 102mm per month. The wettest month is July, averaging 116mm of rainfall. August and December also tend to see above-average precipitation. The driest month is November, with just 79mm. That's 37mm less than July, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Light snowfall can occur between January and December, totalling around 25cm annually. January is the snowiest month with approximately 13cm.

California is moderately windy, with an average annual wind speed of 21km/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 24km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in August, with average winds dropping to 18km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 6km/h between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 23km/h in winter, 23km/h in spring, 18km/h in summer, 21km/h in autumn.

It is currently spring in California, which began on March 20, 2026. California 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 Luglio at around 29°C, while the coldest stretch bottoms out in Gennaio near 2°C. Summer is next, beginning on June 21, 2026 — 92 days from now.

The best time to visit California is during Giugno, when the weather is most comfortable for travellers. During these months, average temperatures hover around 24°C with modest rainfall averaging 91mm per month. By contrast, Luglio can be uncomfortably hot with highs reaching 29°C, while Gennaio is the coldest period with lows dropping to 2°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for California 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.