December weather forecastWest Covina, CA
December
Weather in December
December captures the peak of winter in West Covina with temperatures dropping to a range from 63.5°F (17.5°C) to 47.3°F (8.5°C). The decrease in temperature complements the festive season, giving West Covina a chilly end of the year. The increasing rainfall enriches the scenery with lush greenery, providing beauty beyond imagination. Shorter daylight hours and an increased cloud cover contribute to December’s winter charm. As the year concludes, West Covina's weather conditions beckon a fresh new year filled with diverse climates and sceneries.Temperature
December, with an average high of 63.5°F (17.5°C) and a low of 47.3°F (8.5°C), signifies the coldest month of the year in West Covina.Humidity
In December, the average relative humidity in West Covina is 51%.Rainfall
December is the month with the most rainfall. Rain falls for 5.9 days and accumulates 1.73" (44mm) of precipitation.Snowfall
December is the only month when snow falls in West Covina. December has the most snowfall days of the year. Snow falls for 0.1 days.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 6:39 am and sunset at 4:42 pm. On the last day of December, sunrise is at 6:57 am and sunset at 4:53 pm PST.
Sunshine
The months with the least sunshine in West Covina are February and December, with an average of 6.9h of sunshine.UV index
January, February, November and December, with an average maximum UV index of 4, are months with the lowest UV index in West Covina. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the average person.Note: A maximum UV index of 4 in December translates into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. Direct Sun exposure should be minimized especially during midday when radiation is most intense. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
West Covina, CA
- Average high temperature in December: 63.5°F
The warmest month (with the highest average high temperature) is August (88.9°F).
The month with the lowest average high temperature is December (63.5°F).
- Average low temperature in December: 47.3°F
The month with the highest average low temperature is August (64.9°F).
The coldest month (with the lowest average low temperature) is December (47.3°F).
Average pressure in December
West 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 (29.88"Hg).
Average wind speed in December
West 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 months (with the lowest average wind speed) are September and October (4.5mph).
Average humidity in December
West Covina, CA
- Average humidity in December: 51%
The months with the highest relative humidity are May and June (57%).
The month with the lowest relative humidity is November (46%).
Average rainfall in December
West Covina, CA
- Average rainfall in December: 1.73"
The wettest month (with the highest rainfall) is December (1.73").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in December
West Covina, CA
- Average rainfall days in December: 5.9 days
The month with the highest number of rainy days is March (6.8 days).
The month with the least rainy days is June (1.3 days).
Average snowfall days in December
West Covina, 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
West 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
West 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 (21.6 days).
Average UV index in December
West Covina, CA
- Average UV index in December: 4
The month with the highest UV index is August (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 4).
Average cloud cover in December
West Covina, 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
West 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).
