December weather forecastMackinaw, IL
December
Weather in December
The first month of the winter, December, is still a cold month in Mackinaw, Illinois, with temperature in the range of an average high of 36.5°F (2.5°C) and an average low of 26.4°F (-3.1°C).Temperature
A shift in the average high-temperature occurs in December, reducing from a frosty 48.2°F (9°C) in November to a wintry 36.5°F (2.5°C). Mackinaw's temperature lowers to a mean of 26.4°F (-3.1°C) during the nights in December.Humidity
The average relative humidity in December in Mackinaw is 80%.Rainfall
December is the month with the least rainfall in Mackinaw, Illinois. Rain falls for 4.7 days and accumulates 0.43" (11mm) of precipitation.Snowfall
Months with snowfall in Mackinaw, Illinois, are January through April, October through December. In Mackinaw, in December, snow falls for 4.5 days, with typically accumulated 0.35" (9mm) of snow. In Mackinaw, during the entire year, snow falls for 21.1 days and aggregates up to 3.03" (77mm) of snow.Daylight
With an average of 9h and 18min of daylight, December has the shortest days of the year in Mackinaw.On the first day of December, sunrise is at 7:02 am and sunset at 4:31 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 4:40 pm CST.
Sunshine
In Mackinaw, the average sunshine in December is 4.4h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Mackinaw. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the average person.Note: In December, the maximum UV index of 2 translates into these guidelines:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Mackinaw, IL
- Average high temperature in December: 36.5°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (31.1°F).
- Average low temperature in December: 26.4°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (19°F).
Average pressure in December
Mackinaw, IL
- Average pressure in December: 30.11"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
Mackinaw, IL
- Average wind speed in December: 9.9mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in December
Mackinaw, IL
- Average humidity in December: 80%
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Mackinaw, IL
- Average rainfall in December: 0.43"
The wettest month (with the highest rainfall) is May (1.14").
The driest month (with the least rainfall) is December (0.43").
Average rainfall days in December
Mackinaw, IL
- Average rainfall days in December: 4.7 days
The month with the highest number of rainy days is May (13.4 days).
The month with the least rainy days is January (3.6 days).
Average snowfall in December
Mackinaw, IL
- Average snowfall in December: 0.35"
The month with the highest snowfall is January (1.02").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Mackinaw, IL
- Average snowfall days in December: 4.5 days
The month with the highest number of snowfall days is January (6.8 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
Mackinaw, IL
- Average daylight in December: 9h and 18min
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 18min).
- Average sunshine in December: 4h and 24min
The month with the most sunshine is June (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in December
Mackinaw, IL
- Average sunshine days in December: 22.9 days
The month with the most sunshine days is January (23 days).
The month with the least sunshine days is May (14.7 days).
Average UV index in December
Mackinaw, 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
Mackinaw, IL
- Average cloud cover in December: 54
The month with the most cloud cover is January (Cloud cover 58).
The months with the least cloud cover are August and September (Cloud cover 31).
Average visibility in December
Mackinaw, 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).
