Climate Insights for Geilo

The climate in Geilo is cold. The average annual temperature is 2°C and approximately 945mm 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, June, August. The coldest months are January, February, December, when temperatures can drop to -10°C. Geilo experiences heavy snowfall, typically from January through December.

Temperatures in Geilo vary considerably across the year, with a 25°C difference between the coldest and warmest months. July is the warmest month, though highs remain moderate at 15°C with a mean of 11°C. The coldest month is January, when overnight lows fall to -10°C and the daily average is -7°C. Daily temperature variation is modest, with an average difference of 7°C between highs and lows. The sharpest temperature change occurs between April and May, with a 6°C shift in average temperatures.

Geilo is a moderately rainy area, receiving approximately 945mm of precipitation annually, which averages out to around 79mm per month. The wettest month is September, averaging 112mm of rainfall. August and July also tend to see above-average precipitation. The driest month is April, with just 47mm. That's 66mm less than September, 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 308cm annually from January through December. The snowiest month is December, with approximately 56cm. Winter travel should account for significant snow cover.

Geilo is mildly breezy, with an average annual wind speed of 14km/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 16km/h, though still comfortable for most outdoor activities. The calmest conditions occur in November, with average winds dropping to 13km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 3km/h between the calmest and windiest months.

It is currently spring in Geilo, which began on March 20, 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 15°C, while the coldest stretch bottoms out in January near -10°C. Summer is next, beginning on June 21, 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.