Altarnun Monthly Rainfall & Precipitation
This page shows both the average monthly rainfall and the number of rainy days in Altarnun, Cornwall, United Kingdom. This average is based on long-term data collected between 1990 and 2020. Now, let's explore all the details to give you a full picture.
Altarnun has a relatively rainy climate with high precipitation levels, averaging 1063 mm (42 in) of rainfall annually.
Monthly Precipitation Levels
The average number of days each month with precipitation (> 0.2 mm (0.01 in))
Despite minor fluctuations, Altarnun enjoys fairly consistent precipitation throughout the year. In December, you can expect around 108 mm (4.3 in) of precipitation, while in September, Altarnun receives about 74 mm (2.9 in).
December, the wettest month, has a maximum daytime temperature of 10°C (50°F). The city receives 55 hours of sunshine in this period. During the driest month September you can expect a temperature of 19°C (66°F). For more detailed insights into the city's temperatures, visit our Altarnun Temperature page.
Annual Rainfall in the United Kingdom: City Comparison
The map below shows the annual precipitation across the United Kingdom. You can also select the different months in case you are interested in a specific month.
heavy rainfall
high
moderate
low
almost none
Altarnun vs World: Rainfall Compared
Altarnun's average annual precipitation is 1063 mm (42 in). Let's compare this to some popular worldwide tourist destinations:
In Barcelona, Spain, the average annual precipitation is 644 mm (25 in), evenly distributed across the year with no extreme wet or dry seasons.
Osaka, Japan, experiences 1507 mm (59 in) of rainfall annually, spread across the year with wetter summers.
Melbourne, Australia, has 690 mm (27 in) of rainfall annually, spread fairly evenly throughout the year.
Singapore, situated near the equator, gets 2581 mm (102 in) of rainfall annually, with no distinct dry season and consistent monthly precipitation.
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 Altarnun's weather, including sunshine hours, humidity levels, and temperature data, visit our Altarnun Climate page.
