December weather forecastCovina, CA
December
Weather in December
The first month of the winter, December, is still a refreshing month in Covina, California, with temperature in the range of an average low of 47.1°F (8.4°C) and an average high of 63.1°F (17.3°C).Temperature
December brings the lowest temperatures, with an average high of 63.1°F (17.3°C) and an average low of 47.1°F (8.4°C).Humidity
The average relative humidity in December is 51%.Rainfall
December is the month with the most rainfall in Covina, California. Rain falls for 5.5 days and accumulates 1.5" (38mm) of precipitation.Daylight
December has the shortest days of the year, with an average of 9h and 54min of daylight.On the first day of December in Covina, sunrise is at 6:39 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 4:52 pm PST.
Sunshine
The months with the least sunshine are February and December, with an average of 6.9h of sunshine.UV index
December is the month with the lowest UV index, with an average maximum UV index of 3. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the average person.Note: During December, 3 as the daily maximum UV index converts into the following advice:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Covina, CA
- Average high temperature in December: 63.1°F
The warmest month (with the highest average high temperature) is August (89.1°F).
The month with the lowest average high temperature is December (63.1°F).
- Average low temperature in December: 47.1°F
The month with the highest average low temperature is August (65.1°F).
The coldest month (with the lowest average low temperature) is February (46.4°F).
Average pressure in December
Covina, CA
- Average pressure in December: 30.07"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in December
Covina, CA
- Average wind speed in December: 5.1mph
The windiest months (with the highest average wind speed) are April and May (5.7mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).
Average humidity in December
Covina, CA
- Average humidity in December: 51%
The month with the highest relative humidity is May (56%).
The month with the lowest relative humidity is November (45%).
Average rainfall in December
Covina, CA
- Average rainfall in December: 1.5"
The wettest month (with the highest rainfall) is December (1.5").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in December
Covina, CA
- Average rainfall days in December: 5.5 days
The month with the highest number of rainy days is March (6.3 days).
The month with the least rainy days is June (1.3 days).
Average daylight in December /
Average sunshine in December
Covina, 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 month with the most sunshine is July (Average sunshine: 12h and 6min).
The months with the least sunshine are February and December (Average sunshine: 6h and 54min).
Average sunshine days in December
Covina, CA
- Average sunshine days in December: 23.9 days
The month with the most sunshine days is June (28 days).
The month with the least sunshine days is February (22 days).
Average UV index in December
Covina, CA
- Average UV index in December: 3
The month with the highest UV index is August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in December
Covina, CA
- Average cloud cover in December: 21
The months with the most cloud cover are March and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 4).
Average visibility in December
Covina, 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).
