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
The month of December sees the lowest average temperatures, reaching 58.6°F (14.8°C) at the peak and 41°F (5°C) at the low.Humidity
In December, the average relative humidity is 54%.Rainfall
In San Jacinto, in December, it is raining for 6 days, with typically 1.22" (31mm) of accumulated precipitation. Throughout the year, there are 54 rainfall days, and 6.61" (168mm) of precipitation is accumulated.Snowfall
December is the only month when snow falls. The month with the most snowfall in San Jacinto is December, when snow falls for 0.1 days and typically aggregates up to 0.04" (1mm) of snow.Daylight
With an average of 10h and 0min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 6:35 am and sunset at 4:39 pm. On the last day of December, sunrise is at 6:52 am and sunset at 4:49 pm PST.
Sunshine
The months with the least sunshine are February and December, with an average of 6.7h of sunshine.UV index
The months with the lowest UV index are November and December, with an average maximum UV index of 3. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.Note: A maximum high UV index of 3 in December translates into the following recommendations:
Undertake precautions - Guarding against sun damage is counselled. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Opt for tightly woven and loose clothing to enhance protection from the Sun. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the coldest months?
What is the usual temperature for San Jacinto in December?
What is the average humidity in December?
How many days does it rain in December?
When does it snow the most?
When does it start snowing?
What is the month with the shortest days?
What is the average length of the day in December in San Jacinto?
When are sunrise and sunset in December?
What are the months with the least sunshine in San Jacinto?
How many hours of sunshine does San Jacinto have in December?
What are the months with the lowest UV index in San Jacinto?
How high is the UV index in December in San Jacinto?
Average temperature in December
San Jacinto, CA
- Average high temperature in December: 58.6°F
The warmest month (with the highest average high temperature) is August (90.5°F).
The month with the lowest average high temperature is December (58.6°F).
- Average low temperature in December: 41°F
The month with the highest average low temperature is August (63.1°F).
The coldest month (with the lowest average low temperature) is December (41°F).
Average pressure in December
San Jacinto, CA
- Average pressure in December: 30.06"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in December
San Jacinto, CA
- Average wind speed in December: 5.5mph
The windiest month (with the highest average wind speed) is April (6.2mph).
The calmest month (with the lowest average wind speed) is September (4.7mph).
Average humidity in December
San Jacinto, CA
- Average humidity in December: 54%
The months with the highest relative humidity are February, March and May (56%).
The month with the lowest relative humidity is August (41%).
Average rainfall in December
San Jacinto, CA
- Average rainfall in December: 1.22"
The wettest month (with the highest rainfall) is February (1.38").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in December
San Jacinto, CA
- Average rainfall days in December: 6 days
The month with the highest number of rainy days is March (7.4 days).
The month with the least rainy days is June (1.6 days).
Average snowfall in December
San Jacinto, CA
- Average snowfall in December: 0.04"
The month with the highest snowfall is December (0.04").
The months with the least snowfall are January, February, March, April, May, June, July, August, September, October and November (0").
Average snowfall days in December
San Jacinto, 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
San Jacinto, CA
- Average daylight in December: 10h and 0min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in December: 6h and 4min
The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The months with the least sunshine are February and December (Average sunshine: 6h and 42min).
Average sunshine days in December
San Jacinto, CA
- Average sunshine days in December: 24.2 days
The month with the most sunshine days is October (27.4 days).
The month with the least sunshine days is February (20.9 days).
Average UV index in December
San Jacinto, CA
- Average UV index in December: 3
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are November and December (UV index 3).
Average cloud cover in December
San Jacinto, CA
- Average cloud cover in December: 25
The months with the most cloud cover are March and December (Cloud cover 25).
The month with the least cloud cover is August (Cloud cover 6).
Average visibility in December
San Jacinto, 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).
San Jacinto, California, USA
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