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 snowfall 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
December, with an average high of 54.5°F (12.5°C) and a low of 40.6°F (4.8°C), signifies the coldest month of the year.Humidity
In December, the average relative humidity is 67%.Rainfall
In Thermalito, during December, the rain falls for 11.1 days and regularly aggregates up to 4.33" (110mm) of precipitation. Throughout the year, in Thermalito, California, there are 80.4 rainfall days, and 24.21" (615mm) of precipitation is accumulated.Snowfall
December is the only month when snow falls in Thermalito. The month with the most snowfall days is December, when snow falls for 0.1 days.Daylight
December has the shortest days of the year in Thermalito, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 7:08 am and sunset at 4:43 pm. On the last day of December, sunrise is at 7:26 am and sunset at 4:52 pm PST.
Sunshine
The month with the least sunshine is December, with an average of 5.8h of sunshine.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 medium vulnerability from exposure to the Sun's UV rays for the average person.Note: In December, a daily maximum UV index of 3 leads to the following instructions:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Frequently asked questions
What is the coldest month in Thermalito?
What is the average December temperature in Thermalito?
What is the average humidity in December in Thermalito?
How many days does it rain in December in Thermalito?
When does it snow the most in Thermalito?
When does it start snowing in Thermalito?
What is the month with the shortest days in Thermalito?
How many hours of daylight does Thermalito have in December?
When are sunrise and sunset in December in Thermalito?
What is the month with the least sunshine in Thermalito?
How long on average sun shines in December in Thermalito?
What are the months with the lowest UV index in Thermalito?
What is the UV index reading in December in Thermalito?
Average temperature in December
Thermalito, CA
- Average high temperature in December: 54.5°F
The warmest month (with the highest average high temperature) is July (95.9°F).
The month with the lowest average high temperature is December (54.5°F).
- Average low temperature in December: 40.6°F
The month with the highest average low temperature is July (63.7°F).
The coldest month (with the lowest average low temperature) is December (40.6°F).
Average pressure in December
Thermalito, CA
- Average pressure in December: 30.14"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
Thermalito, CA
- Average wind speed in December: 5.3mph
The windiest month (with the highest average wind speed) is March (6.3mph).
The calmest months (with the lowest average wind speed) are August and November (5.2mph).
Average humidity in December
Thermalito, CA
- Average humidity in December: 67%
The month with the highest relative humidity is March (72%).
The month with the lowest relative humidity is July (33%).
Average rainfall in December
Thermalito, CA
- Average rainfall in December: 4.33"
The wettest month (with the highest rainfall) is March (4.61").
The driest month (with the least rainfall) is July (0.04").
Average rainfall days in December
Thermalito, CA
- Average rainfall days in December: 11.1 days
The month with the highest number of rainy days is March (14.3 days).
The month with the least rainy days is July (1.3 days).
Average snowfall days in December
Thermalito, CA
- Average snowfall days in December: 0.1 days
The month with the highest number of snowfall days is December (0.1 days).
The months with the least snowfall days are January, February, March, April, May, June, July, August, September, October and November (0 days).
Average daylight in December /
Average sunshine in December
Thermalito, 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 6min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in December
Thermalito, CA
- Average sunshine days in December: 19.2 days
The month with the most sunshine days is July (29.3 days).
The month with the least sunshine days is March (15.5 days).
Average UV index in December
Thermalito, CA
- Average UV index in December: 3
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in December
Thermalito, CA
- Average cloud cover in December: 35
The month with the most cloud cover is March (Cloud cover 38).
The month with the least cloud cover is July (Cloud cover 4).
Average visibility in December
Thermalito, 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).
Thermalito, California, USA
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