Climate Overview
The climate in Ono-niimachi is temperate. The average annual temperature is 13°C and approximately 1458mm of precipitation falls per year. Ono-niimachi receives a notable amount of rainfall throughout the year, including during its driest month. Ono-niimachi 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 -2°C. Snowfall occurs from January to December, with around 56cm accumulating over the season.
Temperature
Temperatures in Ono-niimachi vary considerably across the year, with a 31°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 25°C. The coldest month is January, when overnight lows fall to -2°C and the daily average is 1°C. Daily temperature variation is modest, with an average difference of 8°C between highs and lows. The sharpest temperature change occurs between September and October, with a 6°C shift in average temperatures.
Precipitation
Ono-niimachi is a fairly wet location, receiving approximately 1458mm of precipitation annually, which averages out to around 121mm per month. The wettest month is September, averaging 198mm of rainfall. July and August also tend to see above-average precipitation. The driest month is December, with just 45mm. That's 153mm 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. Snowfall is a regular feature from January to December, with around 56cm accumulating over the season. January typically sees the most snow at around 19cm.
Wind
Ono-niimachi is mildly breezy, with an average annual wind speed of 17km/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 21km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in July, with average winds dropping to 12km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 9km/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 20km/h in winter, 18km/h in spring, 13km/h in summer, 15km/h in autumn.
Seasons
88 days until Summer
It is currently spring in Ono-niimachi, which began on March 20, 2026. Ono-niimachi 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 -2°C. Summer is next, beginning on June 21, 2026 — 88 days from now.
Spring
Temperatures range from 2 to 21°C. Rainfall is heavy, totalling around 349mm across the season with a monthly average of 116mm. Winds are moderate at around 18km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 16 to 29°C. Rainfall is heavy, totalling around 527mm across the season with a monthly average of 176mm. Winds are generally light, averaging 13km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 5 to 25°C. Rainfall is heavy, totalling around 432mm across the season with a monthly average of 144mm. Winds are moderate at around 15km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from -2 to 8°C. Rainfall is relatively light, with around 149mm over the season and a monthly average of 50mm. Expect around 35cm of snow accumulation during this period. Winds are moderate at around 20km/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 Ono-niimachi 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.
