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
Rock Falls records the coldest temperatures in January, averaging a high of 22.5°F (-5.3°C) and a low of 10°F (-12.2°C).Humidity
With an average relative humidity of 89%, January is the most humid month in Rock Falls.Rainfall
The month with the least rainfall is January, when the rain falls for 3.8 days and typically collects 0.94" (24mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Rock Falls. In Rock Falls, Iowa, in January, snow falls for 12.7 days, with typically accumulated 4.8" (122mm) of snow. In Rock Falls, Iowa, during the entire year, snow falls for 50.1 days and aggregates up to 21.69" (551mm) of snow.Daylight
In January, the average length of the day in Rock Falls is 9h and 25min.On the first day of the month, sunrise is at 7:44 am and sunset at 4:47 pm. On the last day of January, sunrise is at 7:28 am and sunset at 5:22 pm CST.
Sunshine
The month with the least sunshine is January, with an average of 3.6h of sunshine.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for the ordinary person.Note: A daily maximum UV index of 1 in January translates into the following instructions:
Children must always have sun protection, unlike most people, who can tolerate up to an hour in the sun without any burns. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest time of year in Rock Falls?
How cold is it in Rock Falls in January?
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 much does it snow in Rock Falls in January?
What is the average length of the day in January in Rock Falls?
When is the sunrise / sunset in January in Rock Falls?
What is the month with the least sunshine in Rock Falls?
How many hours of sunshine does Rock Falls have in January?
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, IA
- Average high temperature in January: 22.5°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (22.5°F).
- Average low temperature in January: 10°F
The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (10°F).
Average pressure in January
Rock Falls, IA
- Average pressure in January: 30.14"Hg
The months with the highest atmospheric pressure are January and February (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in January
Rock Falls, IA
- Average wind speed in January: 10.7mph
The windiest months (with the highest average wind speed) are January and April (10.7mph).
The calmest month (with the lowest average wind speed) is July (7.2mph).
Average humidity in January
Rock Falls, IA
- Average humidity in January: 89%
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is October (71%).
Average rainfall in January
Rock Falls, IA
- Average rainfall in January: 0.94"
The wettest month (with the highest rainfall) is June (3.98").
The driest month (with the least rainfall) is January (0.94").
Average rainfall days in January
Rock Falls, IA
- Average rainfall days in January: 3.8 days
The month with the highest number of rainy days is June (17.8 days).
The month with the least rainy days is February (3 days).
Average snowfall in January
Rock Falls, IA
- Average snowfall in January: 4.8"
The month with the highest snowfall is February (5.94").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in January
Rock Falls, IA
- Average snowfall days in January: 12.7 days
The month with the highest number of snowfall days is January (12.7 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, IA
- Average daylight in January: 9h and 2min
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 0min).
- Average sunshine in January: 3h and 4min
The months with the most sunshine are July and August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in January
Rock Falls, IA
- Average sunshine days in January: 15.9 days
The month with the most sunshine days is November (17.7 days).
The month with the least sunshine days is June (10.5 days).
Average UV index in January
Rock Falls, IA
- Average UV index in January: 1
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in January
Rock Falls, IA
- Average cloud cover in January: 62
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in January
Rock Falls, IA
- Average visibility in January: 5mi
The months with the highest visibility are February, March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January and July (5mi).
Rock Falls, Iowa, USA
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