Merthyr Tydfil Monthly Rainfall & Precipitation
This page shows both the average monthly rainfall and the number of rainy days in Merthyr Tydfil, Glamorgan, United Kingdom. The numbers reflect climate data gathered over a 30-year period, from 1990 to 2020. Now, let's break down all the details for a clearer picture.
Merthyr Tydfil has a relatively rain/snowy climate with high precipitation levels, averaging 1221 mm (48 in) of rain/snowfall annually.
Monthly Precipitation Levels
The average number of days each month with precipitation (> 0.2 mm (0.01 in))
The wettest period in Merthyr Tydfil occurs in October, which receives around 122 mm (4.8 in) of precipitation. During the driest month, March, Merthyr Tydfil experiences moderate rainfall, totaling approximately 85 mm (3.3 in). The consistent precipitation levels throughout the year contribute to a relatively stable climate.
October, the wettest month, has a maximum daytime temperature of 14°C (57°F). The city receives 102 hours of sunshine in this period. During the driest month March you can expect a temperature of 10°C (50°F). For more detailed insights into the city's temperatures, visit our Merthyr Tydfil 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
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moderate
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Merthyr Tydfil vs World: Rainfall Compared
Merthyr Tydfil's average annual precipitation is 1221 mm (48 in). Let's compare this to some popular worldwide tourist destinations:
The climate in San Francisco, USA, is influenced by coastal weather, with 469 mm (18 in) of rainfall mostly during the winter months.
Osaka, Japan, experiences 1507 mm (59 in) of rainfall annually, spread across the year with wetter summers.
In Tokyo, Japan, the average annual precipitation is 1528 mm (60 in), with significant summer rains due to typhoon season.
Mumbai, India, experiences a tropical monsoon climate with 1860 mm (73 in) of annual rainfall, with the majority of precipitation happening during the monsoon season from June to September.
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.
Climate change is affecting precipitation patterns worldwide, including Merthyr Tydfil:
- 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.
- Mawsynram in India is noted as being the wettest place on earth, with over 11 meters (36 feet) of rain falling every year.
- In contrast, Antofagasta in Chile is among the driest places on the planet, getting less than 0.1mm (0.004 inches) per year, with some years recording virtually no rainfall.
- Nearly 1,650 thunderstorm cells are estimated over the planet at any given time.
For more detailed information about Merthyr Tydfil's weather, including sunshine hours, humidity levels, and temperature data, visit our Merthyr Tydfil Climate page.
