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
The coldest month is December, with an average high-temperature of 54.9°F (12.7°C) and an average low-temperature of 41.9°F (5.5°C).Humidity
In December, the average relative humidity is 66%.Rainfall
In Glenn, in December, during 11.7 rainfall days, 3.11" (79mm) of precipitation is typically accumulated. Throughout the year, in Glenn, California, there are 82.1 rainfall days, and 17.24" (438mm) of precipitation is accumulated.Daylight
December has the shortest days of the year in Glenn, with an average of 9h and 24min of daylight.On the first day of December in Glenn, sunrise is at 7:10 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 4:54 pm PST.
Sunshine
The month with the least sunshine is December, with an average of 5.8h of sunshine.UV index
The months with the lowest UV index in Glenn are February, November and December, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for average individuals.Note: The daily maximum UV index of 3 in December interprets into the following advice:
Make use of precautions - Shielding skin and eyes from injury is a requirement. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.
Frequently asked questions
What are the coldest months in Glenn?
What are December temperatures in Glenn?
What is the average humidity in December in Glenn?
How many days does it rain in December in Glenn?
What is the month with the shortest days in Glenn?
How many hours of daylight does Glenn have in December?
When is the sunrise / sunset in December in Glenn?
What is the month with the least sunshine in Glenn?
How many hours of sunshine does Glenn have in December?
What are the months with the lowest UV index in Glenn?
How high is the UV index in December in Glenn?
Average temperature in December
Glenn, CA
- Average high temperature in December: 54.9°F
The warmest month (with the highest average high temperature) is July (98.4°F).
The month with the lowest average high temperature is December (54.9°F).
- Average low temperature in December: 41.9°F
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is December (41.9°F).
Average pressure in December
Glenn, CA
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
Glenn, CA
- Average wind speed in December: 6mph
The windiest month (with the highest average wind speed) is March (7.1mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).
Average humidity in December
Glenn, CA
- Average humidity in December: 66%
The month with the highest relative humidity is March (69%).
The months with the lowest relative humidity are July and August (32%).
Average rainfall in December
Glenn, CA
- Average rainfall in December: 3.11"
The wettest month (with the highest rainfall) is February (3.19").
The driest months (with the least rainfall) are July and August (0.08").
Average rainfall days in December
Glenn, CA
- Average rainfall days in December: 11.7 days
The month with the highest number of rainy days is March (14.1 days).
The month with the least rainy days is July (1.6 days).
Average daylight in December /
Average sunshine in December
Glenn, CA
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 5h and 5min
The month with the most sunshine is July (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in December
Glenn, CA
- Average sunshine days in December: 18.5 days
The month with the most sunshine days is July (29.5 days).
The month with the least sunshine days is March (16.1 days).
Average UV index in December
Glenn, CA
- Average UV index in December: 3
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are February, November and December (UV index 3).
Average cloud cover in December
Glenn, CA
- Average cloud cover in December: 35
The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 4).
Average visibility in December
Glenn, 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).
Glenn, California, USA
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