December weather forecastTreforest, United Kingdom

December

Weather in December

The first month of the winter, December, is also a frosty month in Treforest, United Kingdom, with an average temperature ranging between min 4.4°C (39.9°F) and max 7.8°C (46°F).

Temperature

Treforest's shift into December is marked by a subtle change to a still frosty 7.8°C (46°F) from November's 9.7°C (49.5°F) in temperature. Throughout December, Treforest's nights experience a slight temperature dip to a wintry 4.4°C (39.9°F).

Humidity

The months with the highest humidity in Treforest are November and December, with an average relative humidity of 88%.

Rainfall

In Treforest, in December, during 15 rainfall days, 33mm (1.3") of precipitation is typically accumulated. Throughout the year, there are 150.3 rainfall days, and 270mm (10.63") of precipitation is accumulated.

Snowfall

January through April, November and December are months with snowfall in Treforest. In Treforest, in December, snow falls for 0.8 days, with typically accumulated 2mm (0.08") of snow. Throughout the year, in Treforest, there are 6.2 snowfall days, and 15mm (0.59") of snow is accumulated.

Daylight

The month with the shortest days in Treforest is December, with an average of 7h and 54min of daylight.
On the first day of December, sunrise is at 7:57 am and sunset at 4:07 pm. On the last day of the month, sunrise is at 8:19 am and sunset at 4:13 pm GMT.

Sunshine

In Treforest, United Kingdom, the average sunshine in December is 3.8h.

UV index

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: In December, the maximum UV index of 2 translates into these guidelines:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.

Updated: Feb 8, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

In Treforest, 7.8°C (46°F) is the average high-temperature and 4.4°C (39.9°F) is the average low-temperature during December.

The months with the highest humidity in Treforest are November and December, with an average relative humidity of 88%.

In Treforest, United Kingdom, the average relative humidity in December is 88%.

In December, in Treforest, the rain falls for 15 days. Throughout December, 33mm (1.3") of precipitation is accumulated.

In Treforest, United Kingdom, in December, snow falls for 0.8 days, with typically accumulated 2mm (0.08") of snow.

December has the shortest days of the year in Treforest, with an average of 7h and 54min of daylight.

In Treforest, United Kingdom, the average day length in December is 7h and 55min.

In December, on the first day of the month, sunrise is at 7:57 am and sunset at 4:07 pm. On the last day of the month, sunrise is at 8:19 am and sunset at 4:13 pm GMT.

The average sunshine duration in December in Treforest, United Kingdom, is 3.8h.

The months with the lowest UV index in Treforest are January through March, November and December, with an average maximum UV index of 2.

In December, the average daily maximum UV index in Treforest is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health from unsafe exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year J F M A M J J A S O N December

Nov

December

Jan

Average high temperature

9.7°C

7.8°C

7°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

21km/h

22.3km/h

21.9km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

10.7

11.8

12.2

Average UV index

Average cloud cover

Average visibility

Average temperature in December
Treforest, United Kingdom

Average high temperature in December: 7.8°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°C).

Average low temperature in December: 4.4°C

The month with the highest average low temperature is August (12.2°C).
The coldest month (with the lowest average low temperature) is January (3.1°C).

Average pressure in December
Treforest, United Kingdom

Average pressure in December: 1013.8mbar

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
Treforest, United Kingdom

Average wind speed in December: 21km/h

The windiest month (with the highest average wind speed) is February (21.3km/h).
The calmest month (with the lowest average wind speed) is June (14.4km/h).

Average humidity in December
Treforest, United Kingdom

Average humidity in December: 88%

The months with the highest relative humidity are November and December (88%).
The months with the lowest relative humidity are April and May (82%).

Average rainfall in December
Treforest, United Kingdom

Average rainfall in December: 33mm

The wettest month (with the highest rainfall) is November (35mm).
The driest month (with the least rainfall) is May (11mm).

Average rainfall days in December
Treforest, United Kingdom

Average rainfall days in December: 15 days

The month with the highest number of rainy days is November (15.4 days).
The month with the least rainy days is April (9.5 days).

Average snowfall in December
Treforest, United Kingdom

Average snowfall in December: 2mm

The month with the highest snowfall is January (6mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).

Average snowfall days in December
Treforest, United Kingdom

Average snowfall days in December: 0.8 days

The month with the highest number of snowfall days is January (2.3 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
Treforest, United Kingdom

Average daylight in December: 7h and 54min

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 48min

The month with the most sunshine is May (Average sunshine: 7h and 54min).
The month with the least sunshine is November (Average sunshine: 3h and 42min).

Average sunshine days in December
Treforest, United Kingdom

Average sunshine days in December: 11.8 days

The month with the most sunshine days is April (16.8 days).
The month with the least sunshine days is November (10.7 days).

Average UV index in December
Treforest, 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, March, November and December (UV index 2).

Average cloud cover in December
Treforest, United Kingdom

Average cloud cover in December: 62

The month with the most cloud cover is November (Cloud cover 63).
The months with the least cloud cover are April and May (Cloud cover 49).

Average visibility in December
Treforest, 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).