Geilo Rainfall & Precipitation: Monthly Averages and Year-Round Insights
This page shows both the average monthly rainfall and the number of rainy days in Geilo, Buskerud, Norway. The numbers reflect climate data gathered over a 30-year period, from 1990 to 2020. Let’s explore the details to provide you with a complete overview.
Geilo has a notably wet climate with abundant precipitation, recording 1012 mm of rain/snowfall per year.
Monthly Precipitation Levels
The average number of days each month with precipitation (> 0.2 mm)
While rainfall varies throughout the year, each season offers its own charm. July brings wetter days averaging 100 mm of precipitation, spread over 17 rainy days.
In contrast, April experiences a drier climate, with about 61 mm of snow/rainfall spread across 12 snowy/rainy days.
July, the wettest month, has a maximum daytime temperature of 17°C. During the driest month April you can expect a temperature of 4°C. For more detailed insights into the city’s temperatures, visit our Geilo Temperature page.
Annual Precipitation in Norway
The map below shows the annual precipitation across Norway. You can also select the different months in case you are interested in a specific month.





Amsterdam Precipitation Compared World Wide
Geilo’s average annual precipitation is 1012 mm. Let’s compare this to some popular worldwide tourist destinations:
In Toronto, Canada, annual precipitation averages [964 mm], with snowy winters and rainy summers.
In Seoul, South Korea, the average annual precipitation is 1237 mm, with most rain falling during the summer monsoon season.
Adelaide, Australia, enjoys 511 mm of annual precipitation, with dry summers and wet winters.
Bangkok, Thailand, experiences a tropical monsoon climate with 1668 mm of annual rainfall, with the heaviest precipitation occurring during September and October.
How is Precipitation Measured?
Precipitation amounts are measured using specific gauges installed at weather stations, collecting both rain and snow and any other type of precipitation. Rainfall is measured directly in millimeters, while that from snow and ice is obtained by melting it. Automated systems often incorporate heaters to make this easier.
Information from these stations is transmitted via Wi-Fi, satellite, GPS, or telephone connections to central monitoring networks. This information is immediately updated and integrated into weather models and forecasts.
Interesting weather facts
- The U.S. has a significant number of thunderstorms every year, with over 14.6 million taking place across the world annually.
- Approximately 70% of lightning bolts strike land rather than oceans.
- A storm named John was the longest-lasting Pacific tropical storm, continuing for 31 days. As it crossed the dateline twice, it changed status from a hurricane to a typhoon and back to a hurricane.
For more detailed information about Geilo’s weather, including sunshine hours, humidity levels, and temperature data, visit our Geilo Climate page.