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
The arrival of December brings an average high-temperature of a frosty 7.7°C (45.9°F), nearly identical to November's 10.3°C (50.5°F). Greenwich, during December nights, records a temperature marginally cooler than the daytime average, at a wintry 3.5°C (38.3°F).Humidity
December is the most humid month, with an average relative humidity of 88%.Rainfall
In Greenwich, in December, it is raining for 12.1 days, with typically 32mm (1.26") of accumulated precipitation. In Greenwich, during the entire year, the rain falls for 148.8 days and collects up to 306mm (12.05") of precipitation.Snowfall
Months with snowfall are January through April, November and December. In Greenwich, United Kingdom, in December, snow falls for 1.8 days, with typically accumulated 11mm (0.43") of snow. In Greenwich, during the entire year, snow falls for 9.1 days and aggregates up to 48mm (1.89") of snow.Daylight
December has the shortest days of the year, with an average of 7h and 54min of daylight.On the first day of December in Greenwich, United Kingdom, sunrise is at 7:43 am and sunset at 3:54 pm. On the last day of the month, sunrise is at 8:05 am and sunset at 4:01 pm GMT.
Sunshine
The average sunshine in December is 4.2h.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 estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for average individuals.Note: A maximum high daily UV index of 2 during December translates into the following directions:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Be alert to the fact! The reflection from snow can nearly double the UV radiation of the Sun.
Frequently asked questions
What are the temperatures in Greenwich in December?
What is the most humid month in Greenwich?
What is the average humidity in December in Greenwich?
How much does it rain in Greenwich in December?
How many days does it snow in December in Greenwich?
What is the month with the shortest days in Greenwich?
What is the average length of the day in December in Greenwich?
What time are sunrise and sunset in December in Greenwich?
How long on average sun shines in December in Greenwich?
When is the lowest UV index in Greenwich?
How high is the UV index in December in Greenwich?
Average temperature in December
Greenwich, United Kingdom
- Average high temperature in December: 7.7°C
The warmest month (with the highest average high temperature) is July (22.3°C).
The month with the lowest average high temperature is January (6.8°C).
- Average low temperature in December: 3.5°C
The month with the highest average low temperature is August (14.3°C).
The coldest month (with the lowest average low temperature) is January (2.1°C).
Average pressure in December
Greenwich, United Kingdom
- Average pressure in December: 1014.5mbar
The month with the highest atmospheric pressure is September (1016.9mbar).
The month with the lowest atmospheric pressure is November (1010.6mbar).
Average wind speed in December
Greenwich, United Kingdom
- Average wind speed in December: 17.1km/h
The windiest month (with the highest average wind speed) is February (17.4km/h).
The calmest month (with the lowest average wind speed) is September (12.7km/h).
Average humidity in December
Greenwich, United Kingdom
- Average humidity in December: 88%
The month with the highest relative humidity is December (88%).
The month with the lowest relative humidity is August (72%).
Average rainfall in December
Greenwich, United Kingdom
- Average rainfall in December: 32mm
The wettest month (with the highest rainfall) is June (33mm).
The driest month (with the least rainfall) is April (17mm).
Average rainfall days in December
Greenwich, United Kingdom
- Average rainfall days in December: 12.1 days
The month with the highest number of rainy days is July (15.9 days).
The month with the least rainy days is September (9.6 days).
Average snowfall in December
Greenwich, United Kingdom
- Average snowfall in December: 11mm
The month with the highest snowfall is February (17mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in December
Greenwich, United Kingdom
- Average snowfall days in December: 1.8 days
The month with the highest number of snowfall days is February (3.5 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
Greenwich, 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: 4h and 1min
The month with the most sunshine is August (Average sunshine: 7h and 54min).
The month with the least sunshine is February (Average sunshine: 3h and 30min).
Average sunshine days in December
Greenwich, United Kingdom
- Average sunshine days in December: 16.5 days
The month with the most sunshine days is September (18 days).
The month with the least sunshine days is July (12.5 days).
Average UV index in December
Greenwich, United Kingdom
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in December
Greenwich, United Kingdom
- Average cloud cover in December: 59
The month with the most cloud cover is February (Cloud cover 62).
The months with the least cloud cover are August and September (Cloud cover 49).
Average visibility in December
Greenwich, United Kingdom
- Average visibility in December: 9km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October and December (9km).
The month with the lowest visibility is November (8km).
Greenwich, United Kingdom
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