Climate Insights for Clearlake

The climate in Clearlake is temperate. The average annual temperature is 17°C and approximately 628mm of precipitation falls per year. January is the wettest month, receiving around 136mm of rainfall. Clearlake 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 December, January, February, when temperatures can drop to 5°C. Light snow can occur between January and December.

Temperatures in Clearlake vary considerably across the year, with a 30°C difference between the coldest and warmest months. July is the hottest month, with daytime highs reaching 35°C and an average of 27°C. December is the coolest month, with minimum temperatures around 5°C and an average of 8°C. On average, daily temperatures fluctuate by about 12°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 7°C shift in average temperatures.

Clearlake is a relatively dry area, receiving approximately 628mm of precipitation annually, which averages out to around 52mm per month. The wettest month is January, averaging 136mm of rainfall. February and December also tend to see above-average precipitation. The driest month is August, with just 1mm. That's 135mm 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. Light snowfall can occur between January and December, totalling around 14cm annually. February is the snowiest month with approximately 5cm.

Clearlake is relatively calm, with an average annual wind speed of 12km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 13km/h, though still comfortable for most outdoor activities. The calmest conditions occur in November, with average winds dropping to 10km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 3km/h between the calmest and windiest months.

It is currently spring in Clearlake, which began on March 20, 2026. Clearlake 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 35°C, while the coldest stretch bottoms out in December near 5°C. Summer is next, beginning on June 21, 2026 — 91 days from now.

The best time to visit Clearlake is during May, June, September and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 21°C with modest rainfall averaging 17mm per month. By contrast, July can be uncomfortably hot with highs reaching 35°C, while December is the coldest period with lows dropping to 5°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Clearlake 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.