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 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
In Mount Wilson, the lowest average temperatures are observed in December, with a high of 58.5°F (14.7°C) and a low of 43.3°F (6.3°C).Humidity
In Mount Wilson, the average relative humidity in December is 52%.Rainfall
In Mount Wilson, in December, it is raining for 5.8 days, with typically 1.69" (43mm) of accumulated precipitation. In Mount Wilson, during the entire year, the rain falls for 50.3 days and collects up to 8.7" (221mm) of precipitation.Snowfall
Months with snowfall in Mount Wilson are January through April, November and December. The month with the most snowfall is December, when snow falls for 0.5 days and typically aggregates up to 2.99" (76mm) of snow.Daylight
The month with the shortest days in Mount Wilson is December, with an average of 9h and 54min of daylight.On the first day of the month, sunrise is at 6:40 am and sunset at 4:42 pm. On the last day of December, in Mount Wilson, sunrise is at 6:58 am and sunset at 4:53 pm PST.
Sunshine
The months with the least sunshine in Mount Wilson are January, February and December, with an average of 6.9h of sunshine.UV index
November and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for average individuals.Note: An average maximum UV index of 3 in December leads to these recommendations:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
Frequently asked questions
What part of the year is the coldest in Mount Wilson?
What is the temperature in December in Mount Wilson?
What is the average humidity in December in Mount Wilson?
How much does it rain in Mount Wilson in December?
When does it snow the most in Mount Wilson?
How many days does it snow in December in Mount Wilson?
What is the month with the shortest days in Mount Wilson?
How many hours of daylight does Mount Wilson have in December?
What time are sunrise and sunset in December in Mount Wilson?
What is the month with the least sunshine in Mount Wilson?
How many hours of sunshine does Mount Wilson have in December?
When is the lowest UV index in Mount Wilson?
What is the UV index reading in December in Mount Wilson?
Average temperature in December
Mount Wilson, CA
- Average high temperature in December: 58.5°F
The warmest month (with the highest average high temperature) is August (86.2°F).
The month with the lowest average high temperature is December (58.5°F).
- Average low temperature in December: 43.3°F
The month with the highest average low temperature is August (64°F).
The coldest month (with the lowest average low temperature) is December (43.3°F).
Average pressure in December
Mount Wilson, 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 June (29.88"Hg).
Average wind speed in December
Mount Wilson, CA
- Average wind speed in December: 5.7mph
The windiest month (with the highest average wind speed) is April (6mph).
The calmest month (with the lowest average wind speed) is September (4.5mph).
Average humidity in December
Mount Wilson, CA
- Average humidity in December: 52%
The month with the highest relative humidity is March (56%).
The month with the lowest relative humidity is August (45%).
Average rainfall in December
Mount Wilson, CA
- Average rainfall in December: 1.69"
The wettest month (with the highest rainfall) is February (1.73").
The driest month (with the least rainfall) is June (0.08").
Average rainfall days in December
Mount Wilson, CA
- Average rainfall days in December: 5.8 days
The month with the highest number of rainy days is March (6.4 days).
The month with the least rainy days is June (1.3 days).
Average snowfall in December
Mount Wilson, CA
- Average snowfall in December: 2.99"
The month with the highest snowfall is December (2.99").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Mount Wilson, CA
- Average snowfall days in December: 0.5 days
The month with the highest number of snowfall days is February (1.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Mount Wilson, 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 month with the most sunshine is July (Average sunshine: 12h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 54min).
Average sunshine days in December
Mount Wilson, CA
- Average sunshine days in December: 23.7 days
The month with the most sunshine days is June (27.9 days).
The month with the least sunshine days is February (21.4 days).
Average UV index in December
Mount Wilson, CA
- Average UV index in December: 3
The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are November and December (UV index 3).
Average cloud cover in December
Mount Wilson, CA
- Average cloud cover in December: 22
The months with the most cloud cover are March and December (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in December
Mount Wilson, 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).
Mount Wilson, California, USA
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