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 Walnut Creek, California, the lowest average temperatures are observed in December, with a high of 55.4°F (13°C) and a low of 42.4°F (5.8°C).Humidity
The average relative humidity in December in Walnut Creek, California, is 70%.Rainfall
In Walnut Creek, in December, during 10.2 rainfall days, 1.81" (46mm) of precipitation is typically accumulated. In Walnut Creek, during the entire year, the rain falls for 68.7 days and collects up to 11.26" (286mm) of precipitation.Daylight
With an average of 9h and 36min of daylight, December has the shortest days of the year in Walnut Creek.On the first day of December, sunrise is at 7:05 am and sunset at 4:49 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 4:59 pm PST.
Sunshine
With an average of 5.8h of sunshine, December has the least sunshine of the year.UV index
January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.Note: The UV index of 3 during December translates into the following guidance:
Undertake protective steps - Recommendations to avoid sunburn are issued. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. To cut down UV radiation exposure by about half, sport a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the coldest months in Walnut Creek?
What are December temperatures in Walnut Creek?
What is the average humidity in December in Walnut Creek?
How many days does it rain in December in Walnut Creek?
What is the month with the shortest days in Walnut Creek?
What is the average length of the day in December in Walnut Creek?
When is the sunrise / sunset in December in Walnut Creek?
What is the month with the least sunshine in Walnut Creek?
How many hours of sunshine does Walnut Creek have in December?
What is the month with the lowest UV index in Walnut Creek?
How high is the UV index in December in Walnut Creek?
Average temperature in December
Walnut Creek, CA
- Average high temperature in December: 55.4°F
The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is December (55.4°F).
- Average low temperature in December: 42.4°F
The month with the highest average low temperature is September (57.2°F).
The coldest months (with the lowest average low temperature) are January and December (42.4°F).
Average pressure in December
Walnut Creek, CA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Walnut Creek, CA
- Average wind speed in December: 4.9mph
The windiest month (with the highest average wind speed) is May (7.3mph).
The calmest month (with the lowest average wind speed) is November (4.4mph).
Average humidity in December
Walnut Creek, CA
- Average humidity in December: 70%
The month with the highest relative humidity is March (74%).
The months with the lowest relative humidity are September and October (58%).
Average rainfall in December
Walnut Creek, CA
- Average rainfall in December: 1.81"
The wettest month (with the highest rainfall) is February (2.4").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in December
Walnut Creek, CA
- Average rainfall days in December: 10.2 days
The month with the highest number of rainy days is March (12.6 days).
The month with the least rainy days is August (0.8 days).
Average daylight in December /
Average sunshine in December
Walnut Creek, CA
- Average daylight in December: 9h and 4min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in December: 5h and 5min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in December
Walnut Creek, CA
- Average sunshine days in December: 20.1 days
The month with the most sunshine days is August (29.6 days).
The month with the least sunshine days is March (17.5 days).
Average UV index in December
Walnut Creek, CA
- Average UV index in December: 3
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in December
Walnut Creek, 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 8).
Average visibility in December
Walnut Creek, 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).
Walnut Creek, California, USA
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