December weather forecastRock, MI
December
Weather in December
The first month of the winter, December, is still a freezing cold month in Rock, Michigan, with an average temperature fluctuating between 21.6°F (-5.8°C) and 28.9°F (-1.7°C).Temperature
December's arrival coincides with a drop in the average high-temperature, decreasing from November's wintry 39.9°F (4.4°C) to a freezing cold 28.9°F (-1.7°C). Rock's nocturnal average in December closely mirrors its daytime temperatures, settling at a still subzero cold 21.6°F (-5.8°C).Humidity
In December, the average relative humidity is 84%.Rainfall
In December, in Rock, the rain falls for 8.2 days. Throughout December, 1.69" (43mm) of precipitation is accumulated. In Rock, during the entire year, the rain falls for 139.7 days and collects up to 24.17" (614mm) of precipitation.Snowfall
Months with snowfall in Rock, Michigan, are January through April, October through December. In December, it is snowing for 14.5 days. Throughout December, 5.83" (148mm) of snow is accumulated. In Rock, Michigan, during the entire year, snow falls for 76.5 days and aggregates up to 28.46" (723mm) of snow.Daylight
December has the shortest days of the year in Rock, with an average of 8h and 42min of daylight.On the first day of December, sunrise is at 8:11 am and sunset at 5:04 pm. On the last day of the month, sunrise is at 8:30 am and sunset at 5:13 pm EST.
Sunshine
In Rock, the average sunshine in December is 3.2h.UV index
The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for the ordinary person.Note: During December, 2 as the daily maximum UV index converts into the following advice:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Rock, MI
- Average high temperature in December: 28.9°F
The warmest month (with the highest average high temperature) is July (72.7°F).
The month with the lowest average high temperature is January (23.2°F).
- Average low temperature in December: 21.6°F
The month with the highest average low temperature is August (57.9°F).
The coldest month (with the lowest average low temperature) is January (14.2°F).
Average pressure in December
Rock, MI
- Average pressure in December: 30.03"Hg
The month with the highest atmospheric pressure is March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Rock, MI
- Average wind speed in December: 10.9mph
The windiest month (with the highest average wind speed) is November (11mph).
The calmest month (with the lowest average wind speed) is June (7.6mph).
Average humidity in December
Rock, MI
- Average humidity in December: 84%
The months with the highest relative humidity are January and February (87%).
The month with the lowest relative humidity is May (75%).
Average rainfall in December
Rock, MI
- Average rainfall in December: 1.69"
The wettest month (with the highest rainfall) is October (2.91").
The driest month (with the least rainfall) is February (1.14").
Average rainfall days in December
Rock, MI
- Average rainfall days in December: 8.2 days
The month with the highest number of rainy days is May (16.2 days).
The month with the least rainy days is February (5.3 days).
Average snowfall in December
Rock, MI
- Average snowfall in December: 5.83"
The month with the highest snowfall is February (6.42").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Rock, MI
- Average snowfall days in December: 14.5 days
The month with the highest number of snowfall days is January (18.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Rock, MI
- Average daylight in December: 8h and 42min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in December: 3h and 12min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
Average sunshine days in December
Rock, MI
- Average sunshine days in December: 12.4 days
The month with the most sunshine days is September (15.3 days).
The month with the least sunshine days is February (9.9 days).
Average UV index in December
Rock, MI
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 5).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in December
Rock, MI
- Average cloud cover in December: 65
The month with the most cloud cover is February (Cloud cover 70).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in December
Rock, MI
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
