December weather forecastSan Bernardino, CA
December
Weather in December
December, the first month of the winter in San Bernardino, is still a refreshing month, with temperature in the range of an average high of 59.9°F (15.5°C) and an average low of 43.7°F (6.5°C).Temperature
December, recording an average high temperature of 59.9°F (15.5°C) and a low temperature of 43.7°F (6.5°C), is San Bernardino's coldest month.Humidity
The average relative humidity in December in San Bernardino is 51%.Rainfall
The month with the most rainfall is December, when the rain falls for 6 days and typically aggregates up to 1.42" (36mm) of precipitation.Snowfall
January, March through December are months without snowfall in San Bernardino.Daylight
With an average of 9h and 54min of daylight, December has the shortest days of the year in San Bernardino.On the first day of the month, sunrise is at 6:37 am and sunset at 4:39 pm. On the last day of December, in San Bernardino, California, sunrise is at 6:54 am and sunset at 4:50 pm PST.
Sunshine
With an average of 6.9h of sunshine, December has the least sunshine of the year.UV index
December is the month with the lowest UV index, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for the average person.Note: In December, the maximum UV index of 3 translates into these guidelines:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. To cut down UV radiation exposure by about half, sport a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
San Bernardino, CA
- Average high temperature in December: 59.9°F
The warmest month (with the highest average high temperature) is August (91.9°F).
The month with the lowest average high temperature is December (59.9°F).
- Average low temperature in December: 43.7°F
The month with the highest average low temperature is August (65.8°F).
The coldest month (with the lowest average low temperature) is February (43.5°F).
Average pressure in December
San Bernardino, 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 (29.85"Hg).
Average wind speed in December
San Bernardino, CA
- Average wind speed in December: 5.2mph
The windiest months (with the highest average wind speed) are April and May (6mph).
The calmest month (with the lowest average wind speed) is September (4.5mph).
Average humidity in December
San Bernardino, CA
- Average humidity in December: 51%
The month with the highest relative humidity is February (53%).
The month with the lowest relative humidity is August (38%).
Average rainfall in December
San Bernardino, CA
- Average rainfall in December: 1.42"
The wettest month (with the highest rainfall) is December (1.42").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in December
San Bernardino, CA
- Average rainfall days in December: 6 days
The month with the highest number of rainy days is March (6.7 days).
The month with the least rainy days is June (1.2 days).
Average snowfall days in December
San Bernardino, 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
San Bernardino, 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 12min).
The month with the least sunshine is December (Average sunshine: 6h and 54min).
Average sunshine days in December
San Bernardino, CA
- Average sunshine days in December: 24.3 days
The months with the most sunshine days are June and October (27.9 days).
The month with the least sunshine days is February (21.7 days).
Average UV index in December
San Bernardino, CA
- Average UV index in December: 3
The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in December
San Bernardino, CA
- Average cloud cover in December: 21
The months with the most cloud cover are February and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in December
San Bernardino, 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).
