Climate Overview
The climate in Ajigasawa is temperate. The average annual temperature is 12°C and approximately 1895mm of precipitation falls per year. Ajigasawa receives a notable amount of rainfall throughout the year, including during its driest month. Ajigasawa 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 February, January, December, when temperatures can drop to 0°C. Ajigasawa experiences heavy snowfall, typically from January through December.
Temperature
Temperatures in Ajigasawa vary considerably across the year, with a 25°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 25°C and the mean temperature sits around 24°C. The coldest month is February, when overnight lows fall to 0°C and the daily average is 1°C. Daily temperature variation is modest, with an average difference of 3°C between highs and lows. The sharpest temperature change occurs between October and November, with a 7°C shift in average temperatures.
Precipitation
Ajigasawa is a fairly wet location, receiving approximately 1895mm of precipitation annually, which averages out to around 158mm per month. The wettest month is December, averaging 255mm of rainfall. August and October also tend to see above-average precipitation. The driest month is May, with just 109mm. That's 146mm less than December, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Ajigasawa receives heavy snowfall, accumulating around 396cm annually from January through December. The snowiest month is December, with approximately 133cm. Winter travel should account for significant snow cover.
Wind
Ajigasawa is relatively calm, with an average annual wind speed of 6km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is December, averaging 9km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 4km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 5km/h gap 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 8km/h in winter, 6km/h in spring, 5km/h in summer, 6km/h in autumn.
Seasons
91 days until Autumn
It is currently summer in Ajigasawa, which began on June 21, 2026. Ajigasawa 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 25°C, while the coldest stretch bottoms out in February near 0°C. Autumn is next, beginning on September 23, 2026 — 91 days from now.
Spring
Temperatures range from 3 to 15°C. Rainfall is heavy, totalling around 337mm across the season with a monthly average of 112mm. Winds are generally light, averaging 6km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 16 to 25°C. Rainfall is heavy, totalling around 457mm across the season with a monthly average of 152mm. Winds are generally light, averaging 5km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 7 to 22°C. Rainfall is heavy, totalling around 502mm across the season with a monthly average of 167mm. Expect around 15cm of snow accumulation during this period. Winds are generally light, averaging 6km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 0 to 5°C. Rainfall is heavy, totalling around 599mm across the season with a monthly average of 200mm. Expect around 345cm of snow accumulation during this period. Winds are generally light, averaging 8km/h. Warm winter clothing and waterproof boots are a must, and travel may be affected by snow.
Monthly Climate Data
The table below shows monthly climate averages for Ajigasawa 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.
