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°F (13.9°C) and a minimum average of 45.5°F (7.5°C).Humidity
The average relative humidity in December is 71%.Rainfall
In Mount Hermon, during December, the rain falls for 9.8 days and regularly aggregates up to 2.52" (64mm) of precipitation. Throughout the year, there are 72.5 rainfall days, and 13.58" (345mm) of precipitation is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 42min of daylight.On the first day of December, sunrise is at 7:03 am and sunset at 4:51 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 5:01 pm PST.
Sunshine
December has the least sunshine of the year, with an average of 5.8h 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 reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the average person.Note: In December, a daily UV index of 3 turns into the following recommendations:
Be vigilant - Suggestions to stave off sun damage are provided. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the coldest?
What are December temperatures?
What is the average humidity in December?
How many days does it rain in December in Mount Hermon?
What is the month with the shortest days?
How many hours of daylight does Mount Hermon have in December?
What time are sunrise and sunset in December?
What is the month with the least sunshine?
How many hours of sunshine does Mount Hermon have in December?
When is the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Mount Hermon, CA
- Average high temperature in December: 57°F
The warmest month (with the highest average high temperature) is August (74.8°F).
The month with the lowest average high temperature is December (57°F).
- Average low temperature in December: 45.5°F
The month with the highest average low temperature is September (55.4°F).
The coldest month (with the lowest average low temperature) is February (45.1°F).
Average pressure in December
Mount Hermon, 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
Mount Hermon, CA
- Average wind speed in December: 5.9mph
The windiest month (with the highest average wind speed) is April (7.1mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in December
Mount Hermon, CA
- Average humidity in December: 71%
The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is October (67%).
Average rainfall in December
Mount Hermon, CA
- Average rainfall in December: 2.52"
The wettest month (with the highest rainfall) is February (2.6").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in December
Mount Hermon, CA
- Average rainfall days in December: 9.8 days
The month with the highest number of rainy days is March (12.8 days).
The month with the least rainy days is August (0.8 days).
Average daylight in December /
Average sunshine in December
Mount Hermon, CA
- Average daylight in December: 9h and 4min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in December: 5h and 5min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in December
Mount Hermon, CA
- Average sunshine days in December: 20.2 days
The month with the most sunshine days is August (28.9 days).
The month with the least sunshine days is March (17.5 days).
Average UV index in December
Mount Hermon, CA
- Average UV index in December: 3
The months with the highest UV index are June, July, August, September and October (UV index 5).
The months with the lowest UV index are February, November and December (UV index 3).
Average cloud cover in December
Mount Hermon, CA
- Average cloud cover in December: 34
The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 12).
Average visibility in December
Mount Hermon, 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 Hermon, California, USA
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