Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall in January
- Average snowfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
Temperature readings reach their annual highs in January, averaging 19.9°F (-6.7°C) and a minimum average of 6.3°F (-14.3°C).Humidity
The months with the highest humidity in Rock Falls, Wisconsin, are January and February, with an average relative humidity of 91%.Rainfall
January is the month with the least rainfall in Rock Falls. Rain falls for 3.8 days and accumulates 0.87" (22mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Rock Falls, during January, snow falls for 16.9 days and regularly aggregates up to 5.04" (128mm) of snow. Throughout the year, in Rock Falls, there are 69.2 snowfall days, and 26.02" (661mm) of snow is accumulated.Daylight
In Rock Falls, the average length of the day in January is 9h and 16min.On the first day of January, sunrise is at 7:43 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 5:13 pm CST.
Sunshine
With an average of 3h of sunshine, January has the least sunshine of the year.UV index
The months with the lowest UV index in Rock Falls 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 threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum daily UV index of 1 in January converts into the following recommendations:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
Frequently asked questions
What part of the year is the coldest in Rock Falls?
How cold is January in Rock Falls?
What is the most humid month in Rock Falls?
What is the average humidity in January in Rock Falls?
What is the driest month in Rock Falls?
How many days does it rain in January in Rock Falls?
How many days does it snow in January in Rock Falls?
What is the average length of the day in January in Rock Falls?
When are sunrise and sunset in January in Rock Falls?
What is the month with the least sunshine in Rock Falls?
How long on average sun shines in January in Rock Falls?
What are the months with the lowest UV index in Rock Falls?
How high is the UV index in January in Rock Falls?
Average temperature in January
Rock Falls, WI
- Average high temperature in January: 19.9°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 January: 6.3°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 January
Rock Falls, WI
- Average pressure in January: 30.13"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 January
Rock Falls, WI
- Average wind speed in January: 8.6mph
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 January
Rock Falls, WI
- Average humidity in January: 91%
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 January
Rock Falls, WI
- Average rainfall in January: 0.87"
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 January
Rock Falls, WI
- Average rainfall days in January: 3.8 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 January
Rock Falls, WI
- Average snowfall in January: 5.04"
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 January
Rock Falls, WI
- Average snowfall days in January: 16.9 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 January /
Average sunshine in January
Rock Falls, WI
- Average daylight in January: 9h and 2min
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 January: 3h and 0min
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 January
Rock Falls, WI
- Average sunshine days in January: 13.6 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 January
Rock Falls, WI
- Average UV index in January: 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 January
Rock Falls, WI
- Average cloud cover in January: 68
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 January
Rock Falls, WI
- Average visibility in January: 4mi
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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