December weather forecastPalomar Mountain, CA
December
Weather in December
The first month of the winter, December, is still a comfortable month in Palomar Mountain, California, with an average temperature varying between 45.1°F (7.3°C) and 62.4°F (16.9°C).Temperature
The coldest time of the year is December, with temperatures averaging a high of 62.4°F (16.9°C) and a low of 45.1°F (7.3°C).Humidity
In December, the average relative humidity is 58%.Rainfall
In December, the rain falls for 5.5 days. Throughout December, 0.79" (20mm) of precipitation is accumulated. In Palomar Mountain, California, during the entire year, the rain falls for 51.6 days and collects up to 5.59" (142mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. Throughout December, 5.39" (137mm) of snow is accumulated. Throughout the year, 35.51" (902mm) of snow is accumulated.Daylight
With an average of 10h and 0min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 6:33 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 4:50 pm PST.
Sunshine
The month with the least sunshine is December, with an average of 6.7h of sunshine.UV index
The month with the lowest UV index is December, with an average maximum UV index of 3. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: In December, the maximum UV index of 3 transforms into these recommendations:
Ensure safety - Recommendations to avert sunburn are presented. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Palomar Mountain, CA
- Average high temperature in December: 62.4°F
The warmest month (with the highest average high temperature) is August (86.9°F).
The month with the lowest average high temperature is December (62.4°F).
- Average low temperature in December: 45.1°F
The month with the highest average low temperature is August (63.1°F).
The coldest month (with the lowest average low temperature) is February (44.6°F).
Average pressure in December
Palomar Mountain, 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 (29.86"Hg).
Average wind speed in December
Palomar Mountain, CA
- Average wind speed in December: 5mph
The windiest month (with the highest average wind speed) is April (5.3mph).
The calmest month (with the lowest average wind speed) is September (4.2mph).
Average humidity in December
Palomar Mountain, CA
- Average humidity in December: 58%
The month with the highest relative humidity is May (66%).
The month with the lowest relative humidity is November (52%).
Average rainfall in December
Palomar Mountain, CA
- Average rainfall in December: 0.79"
The wettest month (with the highest rainfall) is February (0.94").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in December
Palomar Mountain, CA
- Average rainfall days in December: 5.5 days
The month with the highest number of rainy days is March (7.1 days).
The month with the least rainy days is June (1.3 days).
Average snowfall in December
Palomar Mountain, CA
- Average snowfall in December: 5.4"
The month with the highest snowfall is March (9.4").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Palomar Mountain, CA
- Average snowfall days in December: 0 days
The month with the highest number of snowfall days is February (0.1 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in December /
Average sunshine in December
Palomar Mountain, CA
- Average daylight in December: 10h and 0min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in December: 6h and 42min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).
Average sunshine days in December
Palomar Mountain, CA
- Average sunshine days in December: 24.5 days
The month with the most sunshine days is June (28.1 days).
The month with the least sunshine days is February (21.5 days).
Average UV index in December
Palomar Mountain, CA
- Average UV index in December: 3
The months with the highest UV index are June, July, August and September (UV index 6).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in December
Palomar Mountain, CA
- Average cloud cover in December: 23
The month with the most cloud cover is March (Cloud cover 25).
The month with the least cloud cover is August (Cloud cover 6).
Average visibility in December
Palomar Mountain, 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).
