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 beginning of December marks a decrease in the average high-temperature, transitioning from a chilly 47.7°F (8.7°C) in November to an icy 36.7°F (2.6°C). In Rockford, an average nighttime temperature of 27.1°F (-2.7°C) is expected during December.Humidity
In Rockford, the average relative humidity in December is 82%.Rainfall
In Rockford, in December, it is raining for 6.7 days, with typically 0.79" (20mm) of accumulated precipitation. In Rockford, during the entire year, the rain falls for 111.9 days and collects up to 9.65" (245mm) of precipitation.Snowfall
Months with snowfall are January through April, October through December. In December, it is snowing for 7.3 days. Throughout December, 0.75" (19mm) of snow is accumulated. Throughout the year, there are 31.1 snowfall days, and 3.74" (95mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 7:46 am and sunset at 5:14 pm. On the last day of December, sunrise is at 8:05 am and sunset at 5:23 pm EST.
Sunshine
In December, the average sunshine is 3.9h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index estimate of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for the average person.Note: The daily high UV index of 1 during December translates into the following recommendations:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December?
What is the average humidity in December?
How much does it rain in December?
How much does it snow in December?
What is the month with the shortest days in Rockford?
How many hours of daylight does Rockford have in December?
When are sunrise and sunset in December in Rockford?
How many hours of sunshine does Rockford have in December?
When is the lowest UV index in Rockford?
How high is the UV index in December?
Average temperature in December
Rockford, IN
- Average high temperature in December: 36.7°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: 27.1°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in December
Rockford, IN
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Rockford, IN
- Average wind speed in December: 9.8mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in December
Rockford, IN
- Average humidity in December: 82%
The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is October (74%).
Average rainfall in December
Rockford, IN
- Average rainfall in December: 0.79"
The wettest month (with the highest rainfall) is May (1.22").
The driest months (with the least rainfall) are February and November (0.51").
Average rainfall days in December
Rockford, IN
- Average rainfall days in December: 6.7 days
The month with the highest number of rainy days is May (14 days).
The month with the least rainy days is February (4.6 days).
Average snowfall in December
Rockford, IN
- Average snowfall in December: 0.75"
The month with the highest snowfall is February (1.14").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Rockford, IN
- Average snowfall days in December: 7.3 days
The month with the highest number of snowfall days is January (8.4 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
Rockford, IN
- Average daylight in December: 9h and 2min
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: 3h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in December
Rockford, IN
- Average sunshine days in December: 20 days
The month with the most sunshine days is November (20.9 days).
The month with the least sunshine days is May (13.1 days).
Average UV index in December
Rockford, IN
- 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
Rockford, IN
- Average cloud cover in December: 60
The month with the most cloud cover is January (Cloud cover 64).
The months with the least cloud cover are July and August (Cloud cover 32).
Average visibility in December
Rockford, IN
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, September, October, November and December (6mi).
The month with the lowest visibility is August (5mi).
Rockford, Indiana, USA
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