Climate Overview
The climate in Kosan is temperate. The average annual temperature is 10°C and approximately 1349mm of precipitation falls per year. August is the wettest month, receiving around 279mm of rainfall. Kosan is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, June. The coldest months are January, December, February, when temperatures can drop to -10°C. Snowfall occurs from January to December, with around 77cm accumulating over the season.
Temperature
Kosan has a wide annual temperature range, spanning 36°C from the coldest to 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 -10°C and the daily average is -5°C. Daily temperature variation is modest, with an average difference of 8°C between highs and lows. The sharpest temperature change occurs between November and December, with a 8°C shift in average temperatures.
Precipitation
Kosan is a fairly wet location, receiving approximately 1349mm of precipitation annually, which averages out to around 112mm per month. The wettest month is August, averaging 279mm of rainfall. July and September also tend to see above-average precipitation. The driest month is January, with just 26mm. That's 253mm less than August, 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. Snowfall is a regular feature from January to December, with around 77cm accumulating over the season. February typically sees the most snow at around 21cm.
Wind
Kosan is mildly breezy, with an average annual wind speed of 15km/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 18km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, 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 6km/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 17km/h in winter, 16km/h in spring, 12km/h in summer, 14km/h in autumn.
Seasons
89 days until Summer
It is currently spring in Kosan, which began on March 20, 2026. Kosan 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 -10°C. Summer is next, beginning on June 21, 2026 — 89 days from now.
Spring
Temperatures range from 0 to 20°C. Precipitation is moderate at around 217mm for the season, averaging 72mm per month. Winds are moderate at around 16km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 16 to 26°C. Rainfall is heavy, totalling around 676mm across the season with a monthly average of 225mm. Winds are generally light, averaging 12km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 2 to 22°C. Rainfall is heavy, totalling around 357mm across the season with a monthly average of 119mm. Expect around 8cm of snow accumulation during this period. Winds are generally light, averaging 14km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from -10 to 2°C. Rainfall is relatively light, with around 99mm over the season and a monthly average of 33mm. Expect around 51cm of snow accumulation during this period. Winds are moderate at around 17km/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 Kosan 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.
