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 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, noted for its average high-temperature of 56.3°F (13.5°C) and an average low-temperature of 41.7°F (5.4°C), is considered the coldest month.Humidity
In London, the average relative humidity in December is 66%.Rainfall
In London, in December, during 7.5 rainfall days, 1.81" (46mm) of precipitation is typically accumulated. In London, during the entire year, the rain falls for 62.1 days and collects up to 13.31" (338mm) of precipitation.Snowfall
January, March through December are months without snowfall.Daylight
The month with the shortest days is December, with an average of 9h and 42min of daylight.On the first day of December, sunrise is at 6:51 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 4:52 pm PST.
Sunshine
The month with the least sunshine is December, with an average of 6.4h of sunshine.UV index
January, November and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: The maximum UV index, 3 during December, leads to the following recommendations:
Act with care - Obligation to protect against skin and eye damage is highlighted. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the coldest months?
What is the average December temperature?
What is the average humidity in December?
How much does it rain in London in December?
When it does not snow?
What is the month with the shortest days?
What is the average length of the day in December?
When are sunrise and sunset in December?
What is the month with the least sunshine?
How many hours of sunshine does London have in December?
When is the lowest UV index in London?
What is the UV index reading in December?
Average temperature in December
London, CA
- Average high temperature in December: 56.3°F
The warmest month (with the highest average high temperature) is July (100.4°F).
The month with the lowest average high temperature is December (56.3°F).
- Average low temperature in December: 41.7°F
The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is December (41.7°F).
Average pressure in December
London, CA
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in December
London, CA
- Average wind speed in December: 4.1mph
The windiest month (with the highest average wind speed) is June (5.8mph).
The calmest months (with the lowest average wind speed) are January and December (4.1mph).
Average humidity in December
London, CA
- Average humidity in December: 66%
The month with the highest relative humidity is January (67%).
The months with the lowest relative humidity are July and August (30%).
Average rainfall in December
London, CA
- Average rainfall in December: 1.81"
The wettest month (with the highest rainfall) is March (2.6").
The driest months (with the least rainfall) are June and August (0.08").
Average rainfall days in December
London, CA
- Average rainfall days in December: 7.5 days
The month with the highest number of rainy days is March (11 days).
The month with the least rainy days is August (0.9 days).
Average snowfall days in December
London, CA
- Average snowfall days in December: 0 days
The month with the highest number of snowfall days is February (0.1 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in December /
Average sunshine in December
London, CA
- Average daylight in December: 9h and 4min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in December: 6h and 2min
The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 24min).
Average sunshine days in December
London, CA
- Average sunshine days in December: 22.5 days
The month with the most sunshine days is August (28.8 days).
The month with the least sunshine days is March (19.5 days).
Average UV index in December
London, CA
- Average UV index in December: 3
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January, November and December (UV index 3).
Average cloud cover in December
London, CA
- Average cloud cover in December: 28
The month with the most cloud cover is March (Cloud cover 29).
The months with the least cloud cover are July and August (Cloud cover 5).
Average visibility in December
London, CA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
London, California, USA
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