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 indicates a decrease in the average high-temperature, moving from a frosty 44.6°F (7°C) in November to a wintry 33.3°F (0.7°C). A mean low-temperature of 25.2°F (-3.8°C) is anticipated during the month of December, a slight step down from the daytime high.Humidity
In December, the average relative humidity is 85%.Rainfall
In Rockford, in December, during 7.6 rainfall days, 1.34" (34mm) of precipitation is typically accumulated. Throughout the year, there are 135.2 rainfall days, and 18.19" (462mm) of precipitation is accumulated.Snowfall
Months with snowfall in Rockford are January through April, October through December. In Rockford, during December, snow falls for 16 days and regularly aggregates up to 4.33" (110mm) of snow. Throughout the year, there are 71.5 snowfall days, and 17.52" (445mm) of snow is accumulated.Daylight
With an average of 9h and 6min of daylight, December has the shortest days of the year in Rockford.On the first day of the month, sunrise is at 7:54 am and sunset at 5:08 pm. On the last day of December, in Rockford, sunrise is at 8:13 am and sunset at 5:17 pm EST.
Sunshine
The average sunshine in December in Rockford is 2.8h.UV index
The months with the lowest UV index are January, November and December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for the average person.Note: The UV index of 1 during December leads to these advisories:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Rockford?
What is the average humidity in December?
How much does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Rockford have in December?
When is the sunrise / sunset in December?
How many hours of sunshine does Rockford have in December?
When is the lowest UV index in Rockford?
What is the UV index reading in December?
Average temperature in December
Rockford, MI
- Average high temperature in December: 33.3°F
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (27.3°F).
- Average low temperature in December: 25.2°F
The month with the highest average low temperature is July (61°F).
The coldest month (with the lowest average low temperature) is January (18°F).
Average pressure in December
Rockford, MI
- Average pressure in December: 30.06"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
Rockford, MI
- Average wind speed in December: 9.3mph
The windiest month (with the highest average wind speed) is April (9.9mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).
Average humidity in December
Rockford, MI
- Average humidity in December: 85%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is April (74%).
Average rainfall in December
Rockford, MI
- Average rainfall in December: 1.34"
The wettest month (with the highest rainfall) is October (2.24").
The driest months (with the least rainfall) are February and September (1.1").
Average rainfall days in December
Rockford, MI
- Average rainfall days in December: 7.6 days
The month with the highest number of rainy days is October (15.9 days).
The month with the least rainy days is February (5.9 days).
Average snowfall in December
Rockford, MI
- Average snowfall in December: 4.33"
The month with the highest snowfall is January (4.69").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Rockford, MI
- Average snowfall days in December: 16 days
The month with the highest number of snowfall days is January (19.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Rockford, MI
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in December: 2h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 2h and 18min).
Average sunshine days in December
Rockford, MI
- Average sunshine days in December: 9.5 days
The month with the most sunshine days is September (17.5 days).
The month with the least sunshine days is February (8.5 days).
Average UV index in December
Rockford, MI
- 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, November and December (UV index 1).
Average cloud cover in December
Rockford, MI
- Average cloud cover in December: 70
The month with the most cloud cover is January (Cloud cover 75).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in December
Rockford, MI
- Average visibility in December: 5mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).
Rockford, Michigan, USA
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