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
December
Weather in December
Temperature
The commencement of December brings an average high-temperature of a chilly 8.3°C (46.9°F), marking an inconsequential divergence from November. Onllwyn experiences a subtle drop in temperature during the December nights, recording an average of 5.2°C (41.4°F).Humidity
January and December, with an average relative humidity of 87%, are the most humid months.Rainfall
The wettest months are November and December, with an average 66mm (2.6") of rainfall.Snowfall
January through March and December are months with snowfall. December is the first month it typically snows in Onllwyn, United Kingdom. Throughout December, in the average 1.1 snowfall days, it receives 9mm (0.35") of snow. Throughout the year, in Onllwyn, there are 5.4 snowfall days, and 28mm (1.1") of snow is accumulated.Daylight
With an average of 7h and 54min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:59 am and sunset at 4:07 pm. On the last day of the month, sunrise is at 8:21 am and sunset at 4:14 pm GMT.
Sunshine
In Onllwyn, the average sunshine in December is 3.8h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Onllwyn, United Kingdom. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for the average person.Note: The maximum daily UV index of 2 in December converts into the following recommendations:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in December in Onllwyn?
What are the most humid months in Onllwyn?
What is the average humidity in December in Onllwyn?
What is the wettest month in Onllwyn?
How many days does it rain in December in Onllwyn?
When does it start to snow in Onllwyn?
What is the month with the shortest days in Onllwyn?
What is the average length of the day in December in Onllwyn?
What time are sunrise and sunset in December in Onllwyn?
How many hours of sunshine does Onllwyn have in December?
What is the month with the lowest UV index in Onllwyn?
What is the UV index reading in December in Onllwyn?
Average temperature in December
Onllwyn, United Kingdom
- Average high temperature in December: 8.3°C
The warmest month (with the highest average high temperature) is July (18.2°C).
The months with the lowest average high temperature are January and February (7.3°C).
- Average low temperature in December: 5.2°C
The month with the highest average low temperature is August (12.9°C).
The coldest month (with the lowest average low temperature) is February (3.8°C).
Average pressure in December
Onllwyn, United Kingdom
- Average pressure in December: 1013.7mbar
The months with the highest atmospheric pressure are May and September (1016.7mbar).
The month with the lowest atmospheric pressure is November (1009.8mbar).
Average wind speed in December
Onllwyn, United Kingdom
- Average wind speed in December: 22.4km/h
The windiest month (with the highest average wind speed) is December (22.4km/h).
The calmest month (with the lowest average wind speed) is June (14.9km/h).
Average humidity in December
Onllwyn, United Kingdom
- Average humidity in December: 87%
The months with the highest relative humidity are January and December (87%).
The month with the lowest relative humidity is April (81%).
Average rainfall in December
Onllwyn, United Kingdom
- Average rainfall in December: 66mm
The wettest months (with the highest rainfall) are November and December (66mm).
The driest month (with the least rainfall) is May (31mm).
Average rainfall days in December
Onllwyn, United Kingdom
- Average rainfall days in December: 16.9 days
The month with the highest number of rainy days is November (17 days).
The month with the least rainy days is September (12.6 days).
Average snowfall in December
Onllwyn, United Kingdom
- Average snowfall in December: 9mm
The month with the highest snowfall is January (12mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in December
Onllwyn, United Kingdom
- Average snowfall days in December: 1.1 days
The month with the highest number of snowfall days is January (2 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Onllwyn, 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 6min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in December
Onllwyn, United Kingdom
- Average sunshine days in December: 11.1 days
The month with the most sunshine days is September (14.4 days).
The month with the least sunshine days is July (10.3 days).
Average UV index in December
Onllwyn, 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
Onllwyn, United Kingdom
- Average cloud cover in December: 63
The month with the most cloud cover is December (Cloud cover 63).
The months with the least cloud cover are April and May (Cloud cover 47).
Average visibility in December
Onllwyn, 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).
