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
Summerland experiences its lowest temperatures in December, with an average peak of 59.4°F (15.2°C) and a low of 46.4°F (8°C).Humidity
In December, the average relative humidity is 58%.Rainfall
In Summerland, in December, during 5.5 rainfall days, 1.38" (35mm) of precipitation is typically accumulated. Throughout the year, there are 46.9 rainfall days, and 7.83" (199mm) of precipitation is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 54min of daylight.On the first day of the month, sunrise is at 6:47 am and sunset at 4:48 pm. On the last day of December, sunrise is at 7:04 am and sunset at 4:58 pm PST.
Sunshine
The average sunshine in December is 6.8h.UV index
With an average maximum UV index of 3, December is the month with the lowest UV index. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: A maximum high daily UV index of 3 during December translates into the following directions:
Be vigilant - A duty to shield skin and eyes from injury exists. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest time of year?
What is the usual temperature for Summerland in December?
What is the average humidity in December?
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?
When is the sunrise / sunset in December?
How many hours of sunshine does Summerland have in December?
What is the month with the lowest UV index in Summerland?
What is the UV index reading in December?
Average temperature in December
Summerland, CA
- Average high temperature in December: 59.4°F
The warmest month (with the highest average high temperature) is August (79.2°F).
The month with the lowest average high temperature is December (59.4°F).
- Average low temperature in December: 46.4°F
The month with the highest average low temperature is August (61.3°F).
The coldest month (with the lowest average low temperature) is February (45.3°F).
Average pressure in December
Summerland, CA
- Average pressure in December: 30.08"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is September (29.9"Hg).
Average wind speed in December
Summerland, CA
- Average wind speed in December: 6.2mph
The windiest month (with the highest average wind speed) is April (7mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).
Average humidity in December
Summerland, CA
- Average humidity in December: 58%
The month with the highest relative humidity is March (63%).
The months with the lowest relative humidity are October and November (53%).
Average rainfall in December
Summerland, CA
- Average rainfall in December: 1.38"
The wettest months (with the highest rainfall) are February and March (1.46").
The driest months (with the least rainfall) are June and August (0.12").
Average rainfall days in December
Summerland, CA
- Average rainfall days in December: 5.5 days
The month with the highest number of rainy days is March (6.8 days).
The month with the least rainy days is August (1.5 days).
Average daylight in December /
Average sunshine in December
Summerland, CA
- Average daylight in December: 9h and 5min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in December: 6h and 5min
The months with the most sunshine are June and August (Average sunshine: 12h and 0min).
The month with the least sunshine is February (Average sunshine: 6h and 30min).
Average sunshine days in December
Summerland, CA
- Average sunshine days in December: 24.7 days
The month with the most sunshine days is August (27.3 days).
The month with the least sunshine days is February (21.8 days).
Average UV index in December
Summerland, CA
- Average UV index in December: 3
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in December
Summerland, CA
- Average cloud cover in December: 23
The month with the most cloud cover is March (Cloud cover 24).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in December
Summerland, 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).
Summerland, California, USA
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