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 brings a distinct temperature shift, with the average high-temperature dropping from an icy 40.1°F (4.5°C) in November to a freezing cold 25.3°F (-3.7°C). In Rock Falls, the nighttime temperature averages to a still subzero cold 14.9°F (-9.5°C) during December.Humidity
In Rock Falls, the average relative humidity in December is 89%.Rainfall
In Rock Falls, during December, the rain falls for 5.2 days and regularly aggregates up to 1.38" (35mm) of precipitation. Throughout the year, there are 135.6 rainfall days, and 26.57" (675mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Rock Falls, in December, snow falls for 13.8 days, with typically accumulated 5.2" (132mm) of snow. In Rock Falls, during the entire year, snow falls for 69.2 days and aggregates up to 26.02" (661mm) of snow.Daylight
The month with the shortest days is December, with an average of 8h and 54min of daylight.On the first day of December, sunrise is at 7:24 am and sunset at 4:27 pm. On the last day of the month, sunrise is at 7:43 am and sunset at 4:36 pm CST.
Sunshine
In Rock Falls, Wisconsin, the average sunshine in December is 3.1h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: In December, the maximum UV index of 1 transforms into these recommendations:
Sun exposure does not present considerable issues for many, yet infants, fair-skinned people, and children necessitate constant protection. When the Sun is at its strongest around midday, find shade and limit exposure. Employ a wide-brim hat for potent defense against up to 50% of UV rays. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Frequently asked questions
How cold is it in Rock Falls in December?
What is the average humidity in December in Rock Falls?
How many days does it rain in December in Rock Falls?
How much does it snow in Rock Falls in December?
What is the month with the shortest days in Rock Falls?
How many hours of daylight does Rock Falls have in December?
What time are sunrise and sunset in December in Rock Falls?
How many hours of sunshine does Rock Falls have in December?
What are the months with the lowest UV index in Rock Falls?
What is the UV index intensity in December in Rock Falls?
Average temperature in December
Rock Falls, WI
- Average high temperature in December: 25.3°F
The warmest month (with the highest average high temperature) is July (78.4°F).
The month with the lowest average high temperature is January (19.9°F).
- Average low temperature in December: 14.9°F
The month with the highest average low temperature is July (60.6°F).
The coldest month (with the lowest average low temperature) is January (6.3°F).
Average pressure in December
Rock Falls, WI
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in December
Rock Falls, WI
- Average wind speed in December: 8.5mph
The windiest month (with the highest average wind speed) is April (9.3mph).
The calmest month (with the lowest average wind speed) is July (6.4mph).
Average humidity in December
Rock Falls, WI
- Average humidity in December: 89%
The months with the highest relative humidity are January and February (91%).
The months with the lowest relative humidity are April and October (77%).
Average rainfall in December
Rock Falls, WI
- Average rainfall in December: 1.38"
The wettest month (with the highest rainfall) is June (4.57").
The driest month (with the least rainfall) is January (0.87").
Average rainfall days in December
Rock Falls, WI
- Average rainfall days in December: 5.2 days
The month with the highest number of rainy days is June (17.9 days).
The month with the least rainy days is February (3.6 days).
Average snowfall in December
Rock Falls, WI
- Average snowfall in December: 5.2"
The month with the highest snowfall is February (6.38").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Rock Falls, WI
- Average snowfall days in December: 13.8 days
The month with the highest number of snowfall days is January (16.9 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 Falls, WI
- Average daylight in December: 8h and 5min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in December: 3h and 1min
The months with the most sunshine are July and August (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
Average sunshine days in December
Rock Falls, WI
- Average sunshine days in December: 15.1 days
The month with the most sunshine days is October (16.3 days).
The month with the least sunshine days is June (9.8 days).
Average UV index in December
Rock Falls, WI
- Average UV index in December: 1
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in December
Rock Falls, WI
- Average cloud cover in December: 67
The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in December
Rock Falls, WI
- Average visibility in December: 5mi
The months with the highest visibility are April, May, June, August, October and November (6mi).
The month with the lowest visibility is January (4mi).
Rock Falls, Wisconsin, USA
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