Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
December observes an average high-temperature of a frosty 8.5°C (47.3°F), marking an insignificant difference from November's 10.3°C (50.5°F). The nights of December in Merthyr Mawr are characterized by an average low-temperature of 5.3°C (41.5°F), subtly descending from daytime highs.Humidity
December is the most humid month in Merthyr Mawr, United Kingdom, with an average relative humidity of 86%.Rainfall
In Merthyr Mawr, in December, during 18 rainfall days, 75mm (2.95") of precipitation is typically accumulated. Throughout the year, in Merthyr Mawr, there are 197.2 rainfall days, and 669mm (26.34") of precipitation is accumulated.Snowfall
Months with snowfall in Merthyr Mawr are January through March and December. The month with the most snowfall in Merthyr Mawr is December, when snow falls for 0.8 days and typically aggregates up to 9mm (0.35") of snow.Daylight
December has the shortest days of the year in Merthyr Mawr, with an average of 7h and 54min of daylight.On the first day of December in Merthyr Mawr, sunrise is at 7:58 am and sunset at 4:08 pm. On the last day of the month, sunrise is at 8:19 am and sunset at 4:15 pm GMT.
Sunshine
In Merthyr Mawr, the average sunshine in December is 3.8h.UV index
The months with the lowest UV index in Merthyr Mawr are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for the average person.Note: During December, 2 as the daily maximum UV index converts into the following advice:
Most individuals face no major issues with lengthy exposure to the sun, but children, infants, and individuals with fair skin always require protection. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Enhance your sun protection with tightly woven, yet airy clothing. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Frequently asked questions
What are the temperatures in Merthyr Mawr in December?
What is the most humid month in Merthyr Mawr?
What is the average humidity in December in Merthyr Mawr?
How much does it rain in Merthyr Mawr in December?
What is the snowiest month in Merthyr Mawr?
When does it start to snow in Merthyr Mawr?
What is the month with the shortest days in Merthyr Mawr?
How many hours of daylight does Merthyr Mawr have in December?
When is the sunrise / sunset in December in Merthyr Mawr?
How many hours of sunshine does Merthyr Mawr have in December?
What is the month with the lowest UV index in Merthyr Mawr?
What is the UV index intensity in December in Merthyr Mawr?
Average temperature in December
Merthyr Mawr, United Kingdom
- Average high temperature in December: 8.5°C
The warmest month (with the highest average high temperature) is July (18.8°C).
The month with the lowest average high temperature is January (7.5°C).
- Average low temperature in December: 5.3°C
The month with the highest average low temperature is August (13.2°C).
The coldest month (with the lowest average low temperature) is February (4°C).
Average pressure in December
Merthyr Mawr, United Kingdom
- Average pressure in December: 1013.9mbar
The months with the highest atmospheric pressure are May and September (1016.7mbar).
The month with the lowest atmospheric pressure is November (1009.9mbar).
Average wind speed in December
Merthyr Mawr, United Kingdom
- Average wind speed in December: 23.1km/h
The windiest month (with the highest average wind speed) is December (23.1km/h).
The calmest month (with the lowest average wind speed) is June (15.5km/h).
Average humidity in December
Merthyr Mawr, United Kingdom
- Average humidity in December: 86%
The month with the highest relative humidity is December (86%).
The months with the lowest relative humidity are April and May (81%).
Average rainfall in December
Merthyr Mawr, United Kingdom
- Average rainfall in December: 75mm
The wettest month (with the highest rainfall) is November (79mm).
The driest month (with the least rainfall) is April (32mm).
Average rainfall days in December
Merthyr Mawr, United Kingdom
- Average rainfall days in December: 18 days
The month with the highest number of rainy days is November (19.1 days).
The month with the least rainy days is February (13.9 days).
Average snowfall in December
Merthyr Mawr, United Kingdom
- Average snowfall in December: 9mm
The month with the highest snowfall is December (9mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in December
Merthyr Mawr, United Kingdom
- Average snowfall days in December: 0.8 days
The month with the highest number of snowfall days is February (1.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Merthyr Mawr, United Kingdom
- Average daylight in December: 7h and 5min
The month with the longest days is June (Average daylight: 16h and 36min).
The month with the shortest days is December (Average daylight: 7h and 54min).
- Average sunshine in December: 3h and 5min
The month with the most sunshine is May (Average sunshine: 8h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in December
Merthyr Mawr, United Kingdom
- Average sunshine days in December: 9.5 days
The month with the most sunshine days is May (13.5 days).
The month with the least sunshine days is November (9 days).
Average UV index in December
Merthyr Mawr, United Kingdom
- Average UV index in December: 2
The months with the highest UV index are May, June, July, August and September (UV index 4).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Merthyr Mawr, United Kingdom
- Average cloud cover in December: 63
The month with the most cloud cover is November (Cloud cover 64).
The month with the least cloud cover is April (Cloud cover 48).
Average visibility in December
Merthyr Mawr, United Kingdom
- Average visibility in December: 9km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
Merthyr Mawr, United Kingdom
Weather forecast for your location
2. Allow the app to use your location
