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 shift from November to December in Galena corresponds with a decrease in the average high-temperature, down to a freezing cold 31.8°F (-0.1°C) from a frosty 44.2°F (6.8°C). Throughout December, an average low-temperature of 21.4°F (-5.9°C) is experienced in Galena.Humidity
The average relative humidity in December in Galena is 83%.Rainfall
In Galena, in December, it is raining for 7.6 days, with typically 1.5" (38mm) of accumulated precipitation. In Galena, Illinois, during the entire year, the rain falls for 153.1 days and collects up to 30.75" (781mm) of precipitation.Snowfall
January through April, October through December are months with snowfall in Galena. In Galena, Illinois, in December, snow falls for 10.5 days, with typically accumulated 3.03" (77mm) of snow. In Galena, Illinois, during the entire year, snow falls for 46.9 days and aggregates up to 17.52" (445mm) of snow.Daylight
The month with the shortest days in Galena is December, with an average of 9h and 6min of daylight.On the first day of the month, sunrise is at 7:12 am and sunset at 4:29 pm. On the last day of December, in Galena, sunrise is at 7:30 am and sunset at 4:39 pm CST.
Sunshine
In December, the average sunshine in Galena is 4.1h.UV index
The months with the lowest UV index in Galena are January and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: A maximum high UV index of 1 in December translates into the following recommendations:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Employ a wide-brim hat for potent defense against up to 50% of UV rays. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
Frequently asked questions
How cold is December in Galena?
What is the average humidity in December in Galena?
How many days does it rain in December in Galena?
How many days does it snow in December in Galena?
What is the month with the shortest days in Galena?
What is the average length of the day in December in Galena?
When is the sunrise / sunset in December in Galena?
How many hours of sunshine does Galena have in December?
What are the months with the lowest UV index in Galena?
What is the UV index reading in December in Galena?
Average temperature in December
Galena, IL
- Average high temperature in December: 31.8°F
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (25°F).
- Average low temperature in December: 21.4°F
The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (12.4°F).
Average pressure in December
Galena, IL
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
Galena, IL
- Average wind speed in December: 9.6mph
The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity in December
Galena, IL
- Average humidity in December: 83%
The month with the highest relative humidity is January (87%).
The months with the lowest relative humidity are April and October (76%).
Average rainfall in December
Galena, IL
- Average rainfall in December: 1.5"
The wettest month (with the highest rainfall) is June (4.29").
The driest month (with the least rainfall) is January (1.26").
Average rainfall days in December
Galena, IL
- Average rainfall days in December: 7.6 days
The month with the highest number of rainy days is May (20 days).
The month with the least rainy days is February (4.8 days).
Average snowfall in December
Galena, IL
- Average snowfall in December: 3.03"
The month with the highest snowfall is January (5.12").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Galena, IL
- Average snowfall days in December: 10.5 days
The month with the highest number of snowfall days is January (13.2 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
Galena, IL
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in December: 4h and 1min
The month with the most sunshine is August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in December
Galena, IL
- Average sunshine days in December: 15.7 days
The month with the most sunshine days is November (17.1 days).
The month with the least sunshine days is June (7.9 days).
Average UV index in December
Galena, IL
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Galena, IL
- Average cloud cover in December: 58
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is September (Cloud cover 32).
Average visibility in December
Galena, IL
- Average visibility in December: 6mi
The months with the highest visibility are March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February and July (5mi).
Galena, Illinois, USA
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