December weather forecastRockwood, MI
December
Weather in December
December, the first month of the winter in Rockwood, is still a cold month, with temperature in the range of an average high of 35.4°F (1.9°C) and an average low of 27.5°F (-2.5°C).Temperature
December brings a decrease in the average high-temperature, falling from November's frosty 45.7°F (7.6°C) to a cold 35.4°F (1.9°C). Rockwood registers an average low-temperature of 27.5°F (-2.5°C) throughout December, a modest decrease from its daytime highs.Humidity
The average relative humidity in December in Rockwood is 82%.Rainfall
December is the month with the least rainfall. Rain falls for 8.3 days and accumulates 1.26" (32mm) of precipitation.Snowfall
Months with snowfall are January through May, November and December. In Rockwood, during December, snow falls for 7.4 days and regularly aggregates up to 1.54" (39mm) of snow. In Rockwood, during the entire year, snow falls for 37.7 days and aggregates up to 12.87" (327mm) of snow.Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:42 am and sunset at 5:02 pm. On the last day of the month, sunrise is at 8:01 am and sunset at 5:11 pm EST.
Sunshine
In Rockwood, the average sunshine in December is 3.6h.UV index
The month with the lowest UV index in Rockwood is December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: In December, the UV index of 1 transforms into the following advice:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Boost your sun resistance with garments that are densely woven yet spacious. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Rockwood, MI
- Average high temperature in December: 35.4°F
The warmest month (with the highest average high temperature) is July (79.5°F).
The month with the lowest average high temperature is January (29.5°F).
- Average low temperature in December: 27.5°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 (19.4°F).
Average pressure in December
Rockwood, MI
- Average pressure in December: 30.08"Hg
The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Rockwood, MI
- Average wind speed in December: 10.3mph
The windiest month (with the highest average wind speed) is January (10.6mph).
The calmest month (with the lowest average wind speed) is July (6.8mph).
Average humidity in December
Rockwood, MI
- Average humidity in December: 82%
The month with the highest relative humidity is February (85%).
The month with the lowest relative humidity is October (75%).
Average rainfall in December
Rockwood, MI
- Average rainfall in December: 1.26"
The wettest month (with the highest rainfall) is May (3.15").
The driest month (with the least rainfall) is December (1.26").
Average rainfall days in December
Rockwood, MI
- Average rainfall days in December: 8.3 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is February (6.1 days).
Average snowfall in December
Rockwood, MI
- Average snowfall in December: 1.54"
The month with the highest snowfall is February (4.25").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in December
Rockwood, MI
- Average snowfall days in December: 7.4 days
The month with the highest number of snowfall days is January (10.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Rockwood, MI
- Average daylight in December: 9h and 12min
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 12min).
- Average sunshine in December: 3h and 36min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 3h and 6min).
Average sunshine days in December
Rockwood, MI
- Average sunshine days in December: 16.2 days
The month with the most sunshine days is November (18.4 days).
The month with the least sunshine days is July (10.3 days).
Average UV index in December
Rockwood, MI
- Average UV index in December: 1
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Rockwood, MI
- Average cloud cover in December: 62
The month with the most cloud cover is January (Cloud cover 67).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility in December
Rockwood, MI
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
