Climate Insights for Geilo

The climate in Geilo is cold. The average annual temperature is 1°C and approximately 1329mm of precipitation falls per year. Geilo receives a notable amount of rainfall throughout the year, including during its driest month. Geilo is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, June. The coldest months are February, January, March, when temperatures can drop to -9°C. Geilo experiences heavy snowfall, typically from January through December.

Temperatures in Geilo vary considerably across the year, with a 22°C difference between the coldest and warmest months. July is the warmest month, though highs remain moderate at 13°C with a mean of 10°C. The coldest month is February, when overnight lows fall to -9°C and the daily average is -7°C. Daily temperature variation is modest, with an average difference of 6°C between highs and lows. The sharpest temperature change occurs between May and June, with a 6°C shift in average temperatures.

Geilo is a fairly wet location, receiving approximately 1329mm of precipitation annually, which averages out to around 111mm per month. The wettest month is December, averaging 161mm of rainfall. September and October also tend to see above-average precipitation. The driest month is May, with just 68mm. That's 93mm 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. Geilo receives heavy snowfall, accumulating around 755cm annually from January through December. The snowiest month is December, with approximately 152cm. Winter travel should account for significant snow cover.

Geilo is relatively calm, with an average annual wind speed of 3km/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 3km/h, though still comfortable for most outdoor activities. The calmest conditions occur in May, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 1km/h between the calmest and windiest months.

It is currently summer in Geilo, which began on June 21, 2026. Geilo 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 July at around 13°C, while the coldest stretch bottoms out in February near -9°C. Autumn is next, beginning on September 23, 2026 — 89 days from now.

The table below shows monthly climate averages for Geilo 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.