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 arrival of December records an average high-temperature of a still frosty 7°C (44.6°F), closely related to the 9.7°C (49.5°F) observed in November. During the nights of December, South Reston records an average temperature of 3.7°C (38.7°F), a minor drop from daytime peaks.Humidity
The most humid month in South Reston is December, with an average relative humidity of 87%.Rainfall
In South Reston, during December, the rain falls for 13.6 days and regularly aggregates up to 40mm (1.57") of precipitation. In South Reston, during the entire year, the rain falls for 165.5 days and collects up to 413mm (16.26") of precipitation.Snowfall
January through March, November and December are months with snowfall in South Reston. In December, in South Reston, it is snowing for 1 days. Throughout December, 5mm (0.2") of snow is accumulated. Throughout the year, there are 9.4 snowfall days, and 41mm (1.61") of snow is accumulated.Daylight
December has the shortest days of the year in South Reston, with an average of 7h and 36min of daylight.On the first day of December in South Reston, United Kingdom, sunrise is at 7:52 am and sunset at 3:45 pm. On the last day of the month, sunrise is at 8:14 am and sunset at 3:51 pm GMT.
Sunshine
In December, the average sunshine in South Reston is 4.4h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low health risk from exposure to the Sun's UV rays for average individuals.Note: In December, an average UV index of 2 transforms into the following instructions:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is December cold in South Reston?
What is the most humid month in South Reston?
What is the average humidity in December in South Reston?
How many days does it rain in December in South Reston?
How much does it snow in South Reston in December?
What is the month with the shortest days in South Reston?
How many hours of daylight does South Reston have in December?
When are sunrise and sunset in December in South Reston?
How many hours of sunshine does South Reston have in December?
When is the lowest UV index in South Reston?
What is the UV index reading in December in South Reston?
Average temperature in December
South Reston, United Kingdom
- Average high temperature in December: 7°C
The warmest month (with the highest average high temperature) is August (19.8°C).
The month with the lowest average high temperature is January (6.2°C).
- Average low temperature in December: 3.7°C
The month with the highest average low temperature is August (13.8°C).
The coldest month (with the lowest average low temperature) is January (2.8°C).
Average pressure in December
South Reston, United Kingdom
- Average pressure in December: 1012.1mbar
The month with the highest atmospheric pressure is May (1016.4mbar).
The month with the lowest atmospheric pressure is November (1009.3mbar).
Average wind speed in December
South Reston, United Kingdom
- Average wind speed in December: 22.3km/h
The windiest month (with the highest average wind speed) is December (22.3km/h).
The calmest month (with the lowest average wind speed) is July (14.6km/h).
Average humidity in December
South Reston, United Kingdom
- Average humidity in December: 87%
The month with the highest relative humidity is December (87%).
The month with the lowest relative humidity is August (76%).
Average rainfall in December
South Reston, United Kingdom
- Average rainfall in December: 40mm
The wettest month (with the highest rainfall) is October (48mm).
The driest month (with the least rainfall) is April (18mm).
Average rainfall days in December
South Reston, United Kingdom
- Average rainfall days in December: 13.6 days
The month with the highest number of rainy days is July (17.1 days).
The month with the least rainy days is September (11.3 days).
Average snowfall in December
South Reston, United Kingdom
- Average snowfall in December: 5mm
The month with the highest snowfall is January (17mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in December
South Reston, United Kingdom
- Average snowfall days in December: 1 days
The months with the highest number of snowfall days are January and February (3.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
South Reston, United Kingdom
- Average daylight in December: 7h and 4min
The month with the longest days is June (Average daylight: 16h and 54min).
The month with the shortest days is December (Average daylight: 7h and 36min).
- Average sunshine in December: 4h and 2min
The month with the most sunshine is August (Average sunshine: 8h and 12min).
The months with the least sunshine are February and November (Average sunshine: 3h and 54min).
Average sunshine days in December
South Reston, United Kingdom
- Average sunshine days in December: 13.5 days
The month with the most sunshine days is April (15.7 days).
The month with the least sunshine days is July (11.4 days).
Average UV index in December
South Reston, United Kingdom
- Average UV index in December: 2
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
South Reston, United Kingdom
- Average cloud cover in December: 57
The month with the most cloud cover is February (Cloud cover 61).
The months with the least cloud cover are April and September (Cloud cover 47).
Average visibility in December
South Reston, United Kingdom
- Average visibility in December: 9km
The months with the highest visibility are March, August, September and October (10km).
The months with the lowest visibility are January, February, April, May, June, July, November and December (9km).
