Climate Insights for Chōnan

The climate in Chōnan is temperate. The average annual temperature is 16°C and approximately 1810mm of precipitation falls per year. Chōnan receives a notable amount of rainfall throughout the year, including during its driest month. Chōnan is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are January, February, December, when temperatures can drop to 3°C. Light snow can occur between January and February.

Temperatures in Chōnan vary considerably across the year, with a 26°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 29°C and the mean temperature sits around 27°C. January is the coolest month, with minimum temperatures around 3°C and an average of 6°C. Daily temperature variation is modest, with an average difference of 5°C between highs and lows. The sharpest temperature change occurs between September and October, with a 5°C shift in average temperatures.

Chōnan is a fairly wet location, receiving approximately 1810mm of precipitation annually, which averages out to around 151mm per month. The wettest month is September, averaging 229mm of rainfall. October and June also tend to see above-average precipitation. The driest month is December, with just 72mm. That's 158mm less than September, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall. Light snowfall can occur between January and February, totalling around 5cm annually. February is the snowiest month with approximately 2cm.

Chōnan is moderately windy, with an average annual wind speed of 23km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is April, averaging 26km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in June, with average winds dropping to 21km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 5km/h between the calmest and windiest months.

It is currently spring in Chōnan, which began on March 20, 2026. Chōnan 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 August at around 29°C, while the coldest stretch bottoms out in January near 3°C. Summer is next, beginning on June 21, 2026 — 89 days from now.

The table below shows monthly climate averages for Chōnan 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.