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 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
In Pacifica, the month of December is known for its lowest average temperatures, reaching a high of 55.6°F (13.1°C) and a low of 48.9°F (9.4°C).Humidity
The months with the lowest humidity are November and December, with an average relative humidity of 72%.Rainfall
In Pacifica, during December, the rain falls for 8.8 days and regularly aggregates up to 1.1" (28mm) of precipitation. In Pacifica, during the entire year, the rain falls for 77.3 days and collects up to 6.81" (173mm) of precipitation.Daylight
With an average of 9h and 36min of daylight, December has the shortest days of the year in Pacifica.On the first day of the month, sunrise is at 7:06 am and sunset at 4:51 pm. On the last day of December, in Pacifica, sunrise is at 7:24 am and sunset at 5:01 pm PST.
Sunshine
The month with the least sunshine is December, with an average of 5.7h of sunshine.UV index
The months with the lowest UV index in Pacifica are February and December, with an average maximum UV index of 3. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 3 in December interprets into the following recommendations:
Ensure safety - Sun damage prevention is strongly urged. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Experience reduced UV exposure by about half when donning a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the coldest months?
What is the temperature in December?
What are the least humid months?
What is the average humidity in December in Pacifica?
How much does it rain in December?
What is the month with the shortest days?
What is the average length of the day in December?
What time are sunrise and sunset in December?
What is the month with the least sunshine in Pacifica?
How many hours of sunshine does Pacifica have in December?
When is the lowest UV index in Pacifica?
How high is the UV index in December?
Average temperature in December
Pacifica, CA
- Average high temperature in December: 55.6°F
The warmest month (with the highest average high temperature) is September (67.5°F).
The month with the lowest average high temperature is December (55.6°F).
- Average low temperature in December: 48.9°F
The month with the highest average low temperature is September (56.8°F).
The coldest months (with the lowest average low temperature) are January and February (48.7°F).
Average pressure in December
Pacifica, CA
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is September (29.92"Hg).
Average wind speed in December
Pacifica, CA
- Average wind speed in December: 8.1mph
The windiest month (with the highest average wind speed) is April (9.4mph).
The calmest months (with the lowest average wind speed) are August and September (6.8mph).
Average humidity in December
Pacifica, CA
- Average humidity in December: 72%
The month with the highest relative humidity is August (82%).
The months with the lowest relative humidity are November and December (72%).
Average rainfall in December
Pacifica, CA
- Average rainfall in December: 1.1"
The wettest month (with the highest rainfall) is February (1.34").
The driest months (with the least rainfall) are June, July and September (0.12").
Average rainfall days in December
Pacifica, CA
- Average rainfall days in December: 8.8 days
The month with the highest number of rainy days is March (10.5 days).
The month with the least rainy days is September (3.6 days).
Average daylight in December /
Average sunshine in December
Pacifica, CA
- Average daylight in December: 9h and 4min
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 4min
The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in December
Pacifica, CA
- Average sunshine days in December: 20.7 days
The month with the most sunshine days is October (24.5 days).
The month with the least sunshine days is August (18.7 days).
Average UV index in December
Pacifica, CA
- Average UV index in December: 3
The months with the highest UV index are June, August and September (UV index 5).
The months with the lowest UV index are February and December (UV index 3).
Average cloud cover in December
Pacifica, CA
- Average cloud cover in December: 36
The month with the most cloud cover is March (Cloud cover 39).
The months with the least cloud cover are September and October (Cloud cover 21).
Average visibility in December
Pacifica, 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).
Pacifica, California, USA
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