December weather forecastBerkeley, CA
December
Weather in December
December carries the full onsets of winter with temperatures falling between 44.6°F (7°C) and 55.4°F (13°C). The city experiences an average rainfall of 0.87" (22mm) stretched across 7.5 days, reflecting December as the wettest period of the year. The chilling winds of 5.7mph (9.2km/h) coupled with high relative humidity of 71% create a frosty atmosphere. The short daylight hours of 9.6 and the escalated cloud cover of 35% cast a grey-white canvas across the city. Despite the less harsh winter, it’s advisable for locals and tourists alike to pack snug clothing to enjoy the winter festivities comfortably.Temperature
December, characterized by an average high temperature of 55.4°F (13°C) and a low temperature of 44.6°F (7°C), is generally the coldest month.Humidity
In Berkeley, California, the average relative humidity in December is 71%.Rainfall
In December, the rain falls for 7.5 days. Throughout December, 0.87" (22mm) of precipitation is accumulated. In Berkeley, during the entire year, the rain falls for 55.6 days and collects up to 5.24" (133mm) of precipitation.Daylight
December has the shortest days of the year, with an average of 9h and 36min of daylight.On the first day of the month, sunrise is at 7:06 am and sunset at 4:50 pm. On the last day of December, in Berkeley, sunrise is at 7:24 am and sunset at 5:00 pm PST.
Sunshine
With an average of 5.8h of sunshine, December has the least sunshine of the year.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for average individuals.Note: In December, an average UV index of 3 transforms into the following instructions:
Guard yourself - An obligation to protect skin and eyes from harm exists. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Berkeley, CA
- Average high temperature in December: 55.4°F
The warmest month (with the highest average high temperature) is September (76.6°F).
The month with the lowest average high temperature is December (55.4°F).
- Average low temperature in December: 44.6°F
The month with the highest average low temperature is September (56.8°F).
The coldest month (with the lowest average low temperature) is January (44.2°F).
Average pressure in December
Berkeley, CA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
Average wind speed in December
Berkeley, CA
- Average wind speed in December: 5.7mph
The windiest month (with the highest average wind speed) is May (7.3mph).
The calmest month (with the lowest average wind speed) is November (5mph).
Average humidity in December
Berkeley, CA
- Average humidity in December: 71%
The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is October (64%).
Average rainfall in December
Berkeley, CA
- Average rainfall in December: 0.87"
The wettest month (with the highest rainfall) is February (1.1").
The driest months (with the least rainfall) are June, July, August and September (0.08").
Average rainfall days in December
Berkeley, CA
- Average rainfall days in December: 7.5 days
The month with the highest number of rainy days is March (8.7 days).
The month with the least rainy days is August (1.5 days).
Average daylight in December /
Average sunshine in December
Berkeley, CA
- Average daylight in December: 9h and 36min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in December: 5h and 48min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in December
Berkeley, CA
- Average sunshine days in December: 22.1 days
The month with the most sunshine days is October (26 days).
The month with the least sunshine days is February (20.5 days).
Average UV index in December
Berkeley, CA
- Average UV index in December: 3
The months with the highest UV index are April, May, June, July, August and September (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in December
Berkeley, CA
- Average cloud cover in December: 35
The month with the most cloud cover is March (Cloud cover 36).
The month with the least cloud cover is July (Cloud cover 11).
Average visibility in December
Berkeley, 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).
