December weather forecastGlendora, CA
December
Weather in December
The first month of the winter, December, is still a refreshing month in Glendora, California, with an average temperature varying between 45.5°F (7.5°C) and 61.5°F (16.4°C).Temperature
Glendora, California, experiences its lowest temperatures in December, with an average peak of 61.5°F (16.4°C) and a low of 45.5°F (7.5°C).Humidity
In December, the average relative humidity is 51%.Rainfall
In December, the rain falls for 4.7 days. Throughout December, 1.65" (42mm) of precipitation is accumulated. In Glendora, during the entire year, the rain falls for 44.9 days and collects up to 7.76" (197mm) of precipitation.Snowfall
In Glendora, snow does not fall in January, March through December.Daylight
December has the shortest days of the year, 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 4:41 pm. On the last day of December, sunrise is at 6:57 am and sunset at 4:52 pm PST.
Sunshine
In Glendora, the average sunshine in December is 7h.UV index
The month with the lowest UV index is December, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In December, a regular UV index of 3 translates into these guidelines:
Take precautions. Light skin individuals may get burned in less than 30 minutes. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Boost your sun resistance with garments that are densely woven yet spacious.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Glendora, CA
- Average high temperature in December: 61.5°F
The warmest month (with the highest average high temperature) is August (88.7°F).
The month with the lowest average high temperature is December (61.5°F).
- Average low temperature in December: 45.5°F
The month with the highest average low temperature is August (65.7°F).
The coldest month (with the lowest average low temperature) is December (45.5°F).
Average pressure in December
Glendora, CA
- Average pressure in December: 30.07"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in December
Glendora, CA
- Average wind speed in December: 5.2mph
The windiest months (with the highest average wind speed) are April and May (5.8mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).
Average humidity in December
Glendora, CA
- Average humidity in December: 51%
The months with the highest relative humidity are March and May (55%).
The months with the lowest relative humidity are August and November (45%).
Average rainfall in December
Glendora, CA
- Average rainfall in December: 1.65"
The wettest month (with the highest rainfall) is February (1.73").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in December
Glendora, CA
- Average rainfall days in December: 4.7 days
The month with the highest number of rainy days is March (7.2 days).
The month with the least rainy days is June (1.1 days).
Average snowfall days in December
Glendora, 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
Glendora, 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: 7h and 0min
The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The month with the least sunshine is February (Average sunshine: 6h and 54min).
Average sunshine days in December
Glendora, CA
- Average sunshine days in December: 25.2 days
The month with the most sunshine days is June (28.6 days).
The month with the least sunshine days is February (22.6 days).
Average UV index in December
Glendora, CA
- Average UV index in December: 3
The months with the highest UV index are July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in December
Glendora, 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
Glendora, 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).
