Roisan Monthly Rainfall & Precipitation
This page shows both the average monthly rainfall and the number of rainy days in Roisan, Valle d'Aosta, Italy. This average is based on long-term data collected between 1990 and 2020. Let's explore the details to provide you with a complete overview.
Roisan experiences significant rain/snowfall throughout the year, averaging 1300 mm (51 in) of precipitation annually.
Monthly Precipitation Levels
The average number of days each month with precipitation (> 0.2 mm (0.01 in))
Precipitation levels in Roisan remain relatively steady throughout the year. November has the most snow, with 132 mm (5.2 in) over 14 days. In February, this drops slightly to 94 mm (3.7 in), making the city's climate fairly predictable.
November, the wettest month, has a maximum daytime temperature of 1°C (34°F). The city receives 100 hours of sunshine in this period. During the driest month February you can expect a temperature of -3°C (27°F). For more detailed insights into the city's temperatures, visit our Roisan Temperature page.
Annual Rainfall in Italy: City Comparison
The map below shows the annual precipitation across Italy. You can also select the different months in case you are interested in a specific month.
heavy rainfall
high
moderate
low
almost none
Roisan vs World: Rainfall Compared
Roisan's average annual precipitation is 1300 mm (51 in). Let's compare this to some popular worldwide tourist destinations:
The city of Rome, Italy, has an average annual precipitation of 832 mm (33 in), spread fairly evenly throughout the year.
Beijing, China, receives 560 mm (22 in) of annual precipitation, concentrated in the summer months.
In Brisbane, Australia, the annual precipitation is 979 mm (39 in), making it wetter than Sydney.
Kuala Lumpur, Malaysia, receives 2529 mm (100 in) of annual rainfall, characteristic of its equatorial tropical rainforest climate, with consistent rainfall throughout the year and peak months during March and November.
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.
- 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 Roisan's weather, including sunshine hours, humidity levels, and temperature data, visit our Roisan Climate page.
