December weather forecastMount Shasta, CA
December
Weather in December
December, the first month of the winter in Mount Shasta, is still a cold month, with an average temperature varying between 27.1°F (-2.7°C) and 40.8°F (4.9°C).Temperature
Mount Shasta's coldest month, December, registers temperatures that range from a high of 40.8°F (4.9°C) to a low of 27.1°F (-2.7°C).Humidity
The average relative humidity in December is 79%.Rainfall
In Mount Shasta, in December, during 9.5 rainfall days, 4.02" (102mm) of precipitation is typically accumulated. In Mount Shasta, California, during the entire year, the rain falls for 90.7 days and collects up to 26.38" (670mm) of precipitation.Snowfall
Months with snowfall in Mount Shasta, California, are January through May, September through December. In December, it is snowing for 10.9 days. Throughout December, 12.68" (322mm) of snow is accumulated. Throughout the year, there are 50.2 snowfall days, and 81.42" (2068mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 18min of daylight.On the first day of December, sunrise is at 7:16 am and sunset at 4:40 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 4:50 pm PST.
Sunshine
December has the least sunshine of the year, with an average of 5.4h of sunshine.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the average person.Note: In December, the maximum UV index of 2 translates into these guidelines:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Mount Shasta, CA
- Average high temperature in December: 40.8°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is December (40.8°F).
- Average low temperature in December: 27.1°F
The month with the highest average low temperature is July (52.2°F).
The coldest month (with the lowest average low temperature) is December (27.1°F).
Average pressure in December
Mount Shasta, CA
- Average pressure in December: 30.14"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The months with the lowest atmospheric pressure are June and August (29.94"Hg).
Average wind speed in December
Mount Shasta, CA
- Average wind speed in December: 5mph
The windiest month (with the highest average wind speed) is March (5.8mph).
The calmest month (with the lowest average wind speed) is August (3.9mph).
Average humidity in December
Mount Shasta, CA
- Average humidity in December: 79%
The month with the highest relative humidity is March (81%).
The month with the lowest relative humidity is August (45%).
Average rainfall in December
Mount Shasta, CA
- Average rainfall in December: 4.02"
The wettest month (with the highest rainfall) is March (4.69").
The driest month (with the least rainfall) is July (0.16").
Average rainfall days in December
Mount Shasta, CA
- Average rainfall days in December: 9.5 days
The month with the highest number of rainy days is March (12.3 days).
The month with the least rainy days is August (2.3 days).
Average snowfall in December
Mount Shasta, CA
- Average snowfall in December: 12.68"
The month with the highest snowfall is January (19.21").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Mount Shasta, CA
- Average snowfall days in December: 10.9 days
The month with the highest number of snowfall days is December (10.9 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Mount Shasta, CA
- Average daylight in December: 9h and 18min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 5h and 24min
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 24min).
Average sunshine days in December
Mount Shasta, CA
- Average sunshine days in December: 14.9 days
The months with the most sunshine days are July and August (25.7 days).
The month with the least sunshine days is March (12.3 days).
Average UV index in December
Mount Shasta, CA
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in December
Mount Shasta, CA
- Average cloud cover in December: 43
The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is August (Cloud cover 6).
Average visibility in December
Mount Shasta, CA
- Average visibility in December: 5mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March and December (5mi).
