Climate Insights for Oroville

The climate in Oroville is warm and mild. The average annual temperature is 18°C and approximately 1110mm of precipitation falls per year. March is the wettest month, receiving around 278mm of rainfall. Oroville is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, June, August. The coldest months are December, February, January, when temperatures can drop to 4°C.

Temperatures in Oroville vary considerably across the year, with a 33°C difference between the coldest and warmest months. July is the hottest month, with daytime highs reaching 37°C and an average of 28°C. December is the coolest month, with minimum temperatures around 4°C and an average of 8°C. On average, daily temperatures fluctuate by about 13°C between overnight lows and afternoon highs. The sharpest temperature change occurs between September and October, with a 6°C shift in average temperatures.

Oroville is a moderately rainy area, receiving approximately 1110mm of precipitation annually, which averages out to around 93mm per month. The wettest month is March, averaging 278mm of rainfall. January and October also tend to see above-average precipitation. The driest month is July, with just 0mm. That's 278mm less than March, 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.

Oroville 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 March, averaging 3km/h, though still comfortable for most outdoor activities. The calmest conditions occur in November, with average winds dropping to 2km/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 Oroville, which began on June 21, 2026. Oroville 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 37°C, while the coldest stretch bottoms out in December near 4°C. Autumn is next, beginning on September 23, 2026 — 52 days from now.

The best time to visit Oroville is during April, May and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 21°C with modest rainfall averaging 26mm per month. By contrast, July can be uncomfortably hot with highs reaching 37°C, while December is the coldest period with lows dropping to 4°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Oroville 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. 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.