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
Temperature readings reach their annual highs in December, averaging 57.6°F (14.2°C) and a minimum average of 44.1°F (6.7°C).Humidity
The average relative humidity in December in Spreckels is 71%.Rainfall
The month with the most rainfall in Spreckels is December, when the rain falls for 8.5 days and typically aggregates up to 1.38" (35mm) of precipitation.Daylight
December has the shortest days of the year, with an average of 9h and 42min of daylight.On the first day of December, sunrise is at 7:00 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 5:01 pm PST.
Sunshine
The month with the least sunshine in Spreckels, California, is December, with an average of 6h of sunshine.UV index
The months with the lowest UV index are February, November and December, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a medium vulnerability 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:
Exercise prevention - Precautions against solar damage are endorsed. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What part of the year is the coldest in Spreckels?
What are December temperatures in Spreckels?
What is the average humidity in December in Spreckels?
What is the rainiest month in Spreckels?
How much does it rain in Spreckels in December?
What is the month with the shortest days in Spreckels?
What is the average length of the day in December in Spreckels?
When are sunrise and sunset in December in Spreckels?
What is the month with the least sunshine in Spreckels?
How long on average sun shines in December in Spreckels?
What are the months with the lowest UV index in Spreckels?
How high is the UV index in December in Spreckels?
Average temperature in December
Spreckels, CA
- Average high temperature in December: 57.6°F
The warmest months (with the highest average high temperature) are August and September (76.1°F).
The month with the lowest average high temperature is December (57.6°F).
- Average low temperature in December: 44.1°F
The months with the highest average low temperature are August and September (54.7°F).
The coldest month (with the lowest average low temperature) is December (44.1°F).
Average pressure in December
Spreckels, CA
- Average pressure in December: 30.11"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
Spreckels, CA
- Average wind speed in December: 5.5mph
The windiest month (with the highest average wind speed) is May (6.6mph).
The calmest months (with the lowest average wind speed) are August and September (5mph).
Average humidity in December
Spreckels, CA
- Average humidity in December: 71%
The month with the highest relative humidity is March (76%).
The month with the lowest relative humidity is October (66%).
Average rainfall in December
Spreckels, CA
- Average rainfall in December: 1.38"
The wettest month (with the highest rainfall) is December (1.38").
The driest months (with the least rainfall) are June and August (0.04").
Average rainfall days in December
Spreckels, CA
- Average rainfall days in December: 8.5 days
The month with the highest number of rainy days is March (10.5 days).
The month with the least rainy days is August (0.8 days).
Average daylight in December /
Average sunshine in December
Spreckels, 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
The months with the most sunshine are July and August (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 6h).
Average sunshine days in December
Spreckels, CA
- Average sunshine days in December: 21.5 days
The month with the most sunshine days is August (28.6 days).
The month with the least sunshine days is March (19.2 days).
Average UV index in December
Spreckels, CA
- Average UV index in December: 3
The months with the highest UV index are June, July, August and September (UV index 5).
The months with the lowest UV index are February, November and December (UV index 3).
Average cloud cover in December
Spreckels, CA
- Average cloud cover in December: 32
The month with the most cloud cover is March (Cloud cover 33).
The month with the least cloud cover is July (Cloud cover 8).
Average visibility in December
Spreckels, 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).
Spreckels, California, USA
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