Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
The arrival of December signals a shift in temperature, down from a chilly 48.9°F (9.4°C) in November to a wintry 36.9°F (2.7°C). Throughout the month of December, San Jose expects an average low of 26.4°F (-3.1°C).Humidity
In December, the average relative humidity is 79%.Rainfall
In December, the rain falls for 6.6 days. Throughout December, 1.06" (27mm) of precipitation is accumulated. Throughout the year, in San Jose, Illinois, there are 131.4 rainfall days, and 20.08" (510mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, November and December. In San Jose, in December, during 5.4 snowfall days, 1.22" (31mm) of snow is typically accumulated. In San Jose, during the entire year, snow falls for 25.8 days and aggregates up to 8.66" (220mm) of snow.Daylight
With an average of 9h and 24min of daylight, December has the shortest days of the year in San Jose.On the first day of the month, sunrise is at 7:02 am and sunset at 4:32 pm. On the last day of December, in San Jose, sunrise is at 7:21 am and sunset at 4:42 pm CST.
Sunshine
In December, the average sunshine in San Jose is 4.4h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: In December, the UV index of 2 transforms into the following advice:
Most individuals can handle sun exposure for up to an hour without burning, but children must always be shielded from sun exposure. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Frequently asked questions
How cold is it in San Jose in December?
What is the average humidity in December in San Jose?
How much does it rain in San Jose in December?
How much does it snow in San Jose in December?
What is the month with the shortest days in San Jose?
What is the average length of the day in December in San Jose?
What time are sunrise and sunset in December in San Jose?
How long on average sun shines in December in San Jose?
When is the lowest UV index in San Jose?
How high is the UV index in December in San Jose?
Average temperature in December
San Jose, IL
- Average high temperature in December: 36.9°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (31.5°F).
- Average low temperature in December: 26.4°F
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in December
San Jose, IL
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
San Jose, IL
- Average wind speed in December: 9.8mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity in December
San Jose, IL
- Average humidity in December: 79%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
San Jose, IL
- Average rainfall in December: 1.06"
The wettest month (with the highest rainfall) is May (2.83").
The driest month (with the least rainfall) is February (1.02").
Average rainfall days in December
San Jose, IL
- Average rainfall days in December: 6.6 days
The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is February (5.1 days).
Average snowfall in December
San Jose, IL
- Average snowfall in December: 1.22"
The month with the highest snowfall is January (2.87").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
San Jose, IL
- Average snowfall days in December: 5.4 days
The month with the highest number of snowfall days is January (8.4 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
San Jose, IL
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 4h and 2min
The month with the most sunshine is June (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in December
San Jose, IL
- Average sunshine days in December: 19.7 days
The month with the most sunshine days is November (20 days).
The month with the least sunshine days is May (11.8 days).
Average UV index in December
San Jose, IL
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
San Jose, IL
- Average cloud cover in December: 53
The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is September (Cloud cover 30).
Average visibility in December
San Jose, IL
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
San Jose, Illinois, USA
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