December weather forecastCajon Junction, CA
December
Weather in December
The first month of the winter, December, is also a fresh month in Cajon Junction, California, with an average temperature varying between 39.4°F (4.1°C) and 54.5°F (12.5°C).Temperature
December, with its average high-temperature of 54.5°F (12.5°C) and an average low-temperature of 39.4°F (4.1°C), holds the record as the coldest month.Humidity
With an average relative humidity of 53%, December is the most humid month.Rainfall
December is the month with the most rainfall in Cajon Junction, California. Rain falls for 4 days and accumulates 0.47" (12mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. The month with the most snowfall is December, when snow falls for 1.5 days and typically aggregates up to 1.5" (38mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 54min of daylight.On the first day of the month, sunrise is at 6:38 am and sunset at 4:39 pm. On the last day of December, in Cajon Junction, sunrise is at 6:55 am and sunset at 4:50 pm PST.
Sunshine
With an average of 6.9h of sunshine, December has the least sunshine of the year in Cajon Junction.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum UV index of 3 during December translates into these guidelines:
Preventative actions are necessary - Recommendations to ward off sunburn are given. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Cajon Junction, CA
- Average high temperature in December: 54.5°F
The warmest month (with the highest average high temperature) is August (90.3°F).
The month with the lowest average high temperature is December (54.5°F).
- Average low temperature in December: 39.4°F
The month with the highest average low temperature is August (66.7°F).
The coldest month (with the lowest average low temperature) is December (39.4°F).
Average pressure in December
Cajon Junction, 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 (29.85"Hg).
Average wind speed in December
Cajon Junction, CA
- Average wind speed in December: 6.3mph
The windiest months (with the highest average wind speed) are April and May (8.1mph).
The calmest month (with the lowest average wind speed) is September (5.8mph).
Average humidity in December
Cajon Junction, CA
- Average humidity in December: 53%
The month with the highest relative humidity is December (53%).
The month with the lowest relative humidity is August (33%).
Average rainfall in December
Cajon Junction, CA
- Average rainfall in December: 0.47"
The wettest month (with the highest rainfall) is December (0.47").
The driest month (with the least rainfall) is June (0").
Average rainfall days in December
Cajon Junction, CA
- Average rainfall days in December: 4 days
The month with the highest number of rainy days is March (4.9 days).
The month with the least rainy days is June (0.7 days).
Average snowfall in December
Cajon Junction, CA
- Average snowfall in December: 1.5"
The month with the highest snowfall is December (1.5").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Cajon Junction, CA
- Average snowfall days in December: 1.5 days
The month with the highest number of snowfall days is February (2.4 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Cajon Junction, CA
- Average daylight in December: 9h and 54min
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 54min
The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 54min).
Average sunshine days in December
Cajon Junction, CA
- Average sunshine days in December: 25.6 days
The month with the most sunshine days is June (29 days).
The month with the least sunshine days is February (23.6 days).
Average UV index in December
Cajon Junction, CA
- Average UV index in December: 3
The months with the highest UV index are July and August (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in December
Cajon Junction, CA
- Average cloud cover in December: 22
The month with the most cloud cover is December (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in December
Cajon Junction, 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).
