December weather forecastLoma Portal, CA
December
Weather in December
The first month of the winter, December, is still a refreshing month in Loma Portal, California, with an average temperature ranging between min 52.7°F (11.5°C) and max 63.3°F (17.4°C).Temperature
With December's arrival, Loma Portal's weather records an average high-temperature of a comfortable 63.3°F (17.4°C), marking little difference from November's 68.5°F (20.3°C). Loma Portal's temperature drops to an average low of 52.7°F (11.5°C) during the nights of December.Humidity
In Loma Portal, the average relative humidity in December is 62%.Rainfall
December is the month with the most rainfall. Rain falls for 5.8 days and accumulates 1.65" (42mm) of precipitation.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 6:33 am and sunset at 4:42 pm. On the last day of December, sunrise is at 6:51 am and sunset at 4:53 pm PST.
Sunshine
With an average of 6.7h of sunshine, December has the least sunshine of the year.UV index
January through March, November and December, with an average maximum UV index of 4, are months with the lowest UV index in Loma Portal. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: In December, the maximum UV index of 4 suggests these recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Loma Portal, CA
- Average high temperature in December: 63.3°F
The warmest month (with the highest average high temperature) is August (77.4°F).
The month with the lowest average high temperature is February (63.1°F).
- Average low temperature in December: 52.7°F
The month with the highest average low temperature is August (65.7°F).
The coldest month (with the lowest average low temperature) is February (51.8°F).
Average pressure in December
Loma Portal, CA
- Average pressure in December: 30.06"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are June and September (29.88"Hg).
Average wind speed in December
Loma Portal, CA
- Average wind speed in December: 5.5mph
The windiest months (with the highest average wind speed) are April and May (6.3mph).
The calmest month (with the lowest average wind speed) is October (5.2mph).
Average humidity in December
Loma Portal, CA
- Average humidity in December: 62%
The month with the highest relative humidity is June (73%).
The month with the lowest relative humidity is November (59%).
Average rainfall in December
Loma Portal, CA
- Average rainfall in December: 1.65"
The wettest month (with the highest rainfall) is December (1.65").
The driest month (with the least rainfall) is June (0.12").
Average rainfall days in December
Loma Portal, CA
- Average rainfall days in December: 5.8 days
The month with the highest number of rainy days is March (7.6 days).
The month with the least rainy days is June (2.7 days).
Average daylight in December /
Average sunshine in December
Loma Portal, 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 months with the most sunshine are July and August (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).
Average sunshine days in December
Loma Portal, CA
- Average sunshine days in December: 23.2 days
The month with the most sunshine days is January (24.3 days).
The month with the least sunshine days is July (20.3 days).
Average UV index in December
Loma Portal, CA
- Average UV index in December: 4
The months with the highest UV index are July, August and September (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 4).
Average cloud cover in December
Loma Portal, CA
- Average cloud cover in December: 24
The month with the most cloud cover is December (Cloud cover 24).
The month with the least cloud cover is August (Cloud cover 9).
Average visibility in December
Loma Portal, 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).
