Climate Insights for Koshi

The climate in Koshi is cool. The average annual temperature is 9°C and approximately 3088mm of precipitation falls per year. Koshi receives a notable amount of rainfall throughout the year, including during its driest month. Koshi 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 -7°C. Koshi experiences heavy snowfall, typically from January through December.

Temperatures in Koshi vary considerably across the year, with a 33°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 26°C and the mean temperature sits around 23°C. The coldest month is January, when overnight lows fall to -7°C and the daily average is -4°C. Daily temperature variation is modest, with an average difference of 6°C between highs and lows. The sharpest temperature change occurs between November and December, with a 7°C shift in average temperatures.

Koshi is a very wet location, receiving approximately 3088mm of precipitation annually, which averages out to around 257mm per month. The wettest month is July, averaging 425mm of rainfall. August and September also tend to see above-average precipitation. The driest month is March, with just 186mm. That's 238mm less than July, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Koshi receives heavy snowfall, accumulating around 476cm annually from January through December. The snowiest month is January, with approximately 141cm. Winter travel should account for significant snow cover.

Koshi is relatively calm, with an average annual wind speed of 8km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is January, averaging 10km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 6km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 4km/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 10km/h in winter, 9km/h in spring, 7km/h in summer, 8km/h in autumn.

It is currently spring in Koshi, which began on March 20, 2026. Koshi 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 26°C, while the coldest stretch bottoms out in January near -7°C. Summer is next, beginning on June 21, 2026 — 88 days from now.

The table below shows monthly climate averages for Koshi 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.