December weather forecastFort Irwin, CA
December
Weather in December
The first month of the winter, December, is still a cool month in Fort Irwin, California, with an average temperature ranging between max 55°F (12.8°C) and min 40.1°F (4.5°C).Temperature
December is the month that records the lowest temperatures, with averages ranging from a high of 55°F (12.8°C) to a low of 40.1°F (4.5°C).Humidity
December is the most humid month in Fort Irwin, California, with an average relative humidity of 47%.Rainfall
The month with the most rainfall in Fort Irwin is December, when the rain falls for 4.6 days and typically aggregates up to 0.51" (13mm) of precipitation.Snowfall
In Fort Irwin, California, snow does not fall in February through December.Daylight
With an average of 9h and 48min of daylight, December has the shortest days of the year in Fort Irwin.On the first day of December in Fort Irwin, sunrise is at 6:37 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 4:44 pm PST.
Sunshine
In December, the average sunshine in Fort Irwin is 7.2h.UV index
November and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: The maximum daily UV index, 3 in December, converts into the following recommendations:
Make use of precautions - Suggestions to resist sunburn are communicated. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Fort Irwin, CA
- Average high temperature in December: 55°F
The warmest month (with the highest average high temperature) is July (98.2°F).
The month with the lowest average high temperature is December (55°F).
- Average low temperature in December: 40.1°F
The month with the highest average low temperature is August (74.7°F).
The coldest month (with the lowest average low temperature) is December (40.1°F).
Average pressure in December
Fort Irwin, CA
- Average pressure in December: 30.08"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.79"Hg).
Average wind speed in December
Fort Irwin, CA
- Average wind speed in December: 6.6mph
The windiest month (with the highest average wind speed) is May (11.7mph).
The calmest month (with the lowest average wind speed) is January (6mph).
Average humidity in December
Fort Irwin, CA
- Average humidity in December: 47%
The month with the highest relative humidity is December (47%).
The month with the lowest relative humidity is August (21%).
Average rainfall in December
Fort Irwin, CA
- Average rainfall in December: 0.51"
The wettest month (with the highest rainfall) is December (0.51").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in December
Fort Irwin, CA
- Average rainfall days in December: 4.6 days
The month with the highest number of rainy days is December (4.6 days).
The month with the least rainy days is June (0.6 days).
Average snowfall in December
Fort Irwin, CA
- Average snowfall in December: 0"
The month with the highest snowfall is January (0.04").
The months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in December
Fort Irwin, CA
- Average snowfall days in December: 0.3 days
The months with the highest number of snowfall days are January and December (0.3 days).
The months with the least snowfall days are February, March, April, May, June, July, August, September, October and November (0 days).
Average daylight in December /
Average sunshine in December
Fort Irwin, CA
- Average daylight in December: 9h and 48min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in December: 7h and 12min
The months with the most sunshine are June, July and August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 7h and 6min).
Average sunshine days in December
Fort Irwin, CA
- Average sunshine days in December: 25.4 days
The month with the most sunshine days is June (29 days).
The month with the least sunshine days is February (23.5 days).
Average UV index in December
Fort Irwin, CA
- Average UV index in December: 3
The months with the highest UV index are June and July (UV index 8).
The months with the lowest UV index are November and December (UV index 3).
Average cloud cover in December
Fort Irwin, CA
- Average cloud cover in December: 18
The month with the most cloud cover is December (Cloud cover 18).
The month with the least cloud cover is June (Cloud cover 4).
Average visibility in December
Fort Irwin, 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).
