Greencastle Rainfall & Precipitation: Monthly Averages and Year-Round Insights
This page shows the average amount of rainfall per month in Greencastle. The numbers are calculated over a 30-year period to provide a reliable average. Let’s explore the details in depth to provide you with a complete overview.
Greencastle has a relatively rain/snowy climate with high precipitation levels, averaging 1098 mm of rain/snowfall annually.
Monthly Precipitation Levels
The average number of days each month with precipitation (> 0.2 mm)
Precipitation levels in Greencastle remain relatively steady throughout the year. August has the most rain, with 102 mm over 20 days. In March, this drops slightly to 81 mm, making the city's climate fairly predictable.
August, the wettest month, has a maximum daytime temperature of 19°C. The city receives 140 hours of sunshine in this period. During the driest month March you can expect a temperature of 10°C. For more detailed insights into the city’s temperatures, visit our Greencastle Temperature page.
Annual Precipitation in the United Kingdom
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.





Amsterdam Precipitation Compared World Wide
Greencastle’s average annual precipitation is 1098 mm. Let’s compare this to some popular worldwide tourist destinations:
In Lisbon, Portugal, the average annual precipitation is 774 mm, characterized by wet winters and dry summers typical of the Mediterranean climate.
Meanwhile, Buenos Aires, Argentina, enjoys a humid subtropical climate with 1000 mm of annual rainfall, mostly in the summer.
In Tokyo, Japan, the average annual precipitation is 1528 mm, with significant summer rains due to typhoon season.
Singapore, situated near the equator, gets 2581 mm of rainfall annually, with no distinct dry season and consistent monthly precipitation.
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.
Global Warming and Precipitation
Climate change is affecting precipitation patterns worldwide, including Greencastle:
- Changing Rainfall Patterns: Global warming causes drastic changes in the patterns of rainfall. Some areas have been experiencing increased frequency and intensity of rainfall, while other areas experience longer dry spells or even droughts.
- Local Impacts: Many regions are experiencing heavier rainfall in the winter months and drier, hotter summers. This affects agriculture, water resources, and ecosystems.
For more detailed information about Greencastle’s weather, including sunshine hours, humidity levels, and temperature data, visit our Greencastle Climate page.