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 corresponds with a reduction in the average high-temperature, down from November's frosty 44.6°F (7°C) to a wintry 32.7°F (0.4°C). Throughout the month of December, the nighttime temperature dips to an average of 22.8°F (-5.1°C).Humidity
In December, the average relative humidity in McCullom Lake, Illinois, is 82%.Rainfall
The month with the least rainfall in McCullom Lake is December, when the rain falls for 7.9 days and typically collects 1.34" (34mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In McCullom Lake, in December, snow falls for 10.3 days, with typically accumulated 2.6" (66mm) of snow. In McCullom Lake, during the entire year, snow falls for 49 days and aggregates up to 16.5" (419mm) of snow.Daylight
The month with the shortest days in McCullom Lake is December, with an average of 9h and 6min of daylight.On the first day of December in McCullom Lake, sunrise is at 7:03 am and sunset at 4:21 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 4:30 pm CST.
Sunshine
In December, the average sunshine is 4h.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for the average person.Note: In December, the maximum UV index of 1 suggests this advice:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in McCullom Lake?
What is the average humidity in December in McCullom Lake?
What is the driest month in McCullom Lake?
How much does it rain in McCullom Lake in December?
How many days does it snow in December in McCullom Lake?
What is the month with the shortest days in McCullom Lake?
How many hours of daylight does McCullom Lake have in December?
What time are sunrise and sunset in December in McCullom Lake?
How long on average sun shines in December in McCullom Lake?
When is the lowest UV index in McCullom Lake?
What is the UV index intensity in December in McCullom Lake?
Average temperature in December
McCullom Lake, IL
- Average high temperature in December: 32.7°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 (26.6°F).
- Average low temperature in December: 22.8°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (14.9°F).
Average pressure in December
McCullom Lake, IL
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
McCullom Lake, IL
- Average wind speed in December: 9.3mph
The windiest month (with the highest average wind speed) is January (10mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in December
McCullom Lake, IL
- Average humidity in December: 82%
The months with the highest relative humidity are January and February (85%).
The month with the lowest relative humidity is October (76%).
Average rainfall in December
McCullom Lake, IL
- Average rainfall in December: 1.34"
The wettest month (with the highest rainfall) is June (3.58").
The driest month (with the least rainfall) is December (1.34").
Average rainfall days in December
McCullom Lake, IL
- Average rainfall days in December: 7.9 days
The month with the highest number of rainy days is July (18.3 days).
The month with the least rainy days is February (4.9 days).
Average snowfall in December
McCullom Lake, IL
- Average snowfall in December: 2.6"
The month with the highest snowfall is January (5.16").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
McCullom Lake, IL
- Average snowfall days in December: 10.3 days
The month with the highest number of snowfall days is January (13.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
McCullom Lake, 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 0min
The months with the most sunshine are July and August (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in December
McCullom Lake, IL
- Average sunshine days in December: 15.9 days
The month with the most sunshine days is November (16 days).
The month with the least sunshine days is June (10.2 days).
Average UV index in December
McCullom Lake, IL
- Average UV index in December: 1
The month with the highest UV index is August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
McCullom Lake, IL
- Average cloud cover in December: 60
The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are August and September (Cloud cover 31).
Average visibility in December
McCullom Lake, IL
- Average visibility in December: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
McCullom Lake, Illinois, USA
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