January weather forecastRock Island, IL
January
Weather in January
January, like December, is a freezing cold winter month in Rock Island, Illinois, with temperature in the range of an average high of 28°F (-2.2°C) and an average low of 15.6°F (-9.1°C).Temperature
Rock Island's coldest weather arrives in January, when temperatures average a high of 28°F (-2.2°C) and a low of 15.6°F (-9.1°C).Humidity
January and July, with an average relative humidity of 83%, are the most humid months in Rock Island.Rainfall
In January, the rain falls for 4.3 days. Throughout January, 1.3" (33mm) of precipitation is accumulated. Throughout the year, there are 138.1 rainfall days, and 27.32" (694mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, October through December. January is the month with the most snowfall. Snow falls for 10.9 days and accumulates 3.98" (101mm) of snow.Daylight
In Rock Island, the average length of the day in January is 9h and 35min.On the first day of the month, sunrise is at 7:28 am and sunset at 4:42 pm. On the last day of January, sunrise is at 7:15 am and sunset at 5:16 pm CST.
Sunshine
January has the least sunshine of the year, with an average of 3.9h of sunshine.UV index
January is the month with the lowest UV index, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum UV index of 1 during January translates into these guidelines:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in January
Rock Island, IL
- Average high temperature in January: 28°F
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (28°F).
- Average low temperature in January: 15.6°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (15.6°F).
Average pressure in January
Rock Island, IL
- 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 (29.9"Hg).
Average wind speed in January
Rock Island, IL
- Average wind speed in January: 10.3mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.7mph).
Average humidity in January
Rock Island, IL
- Average humidity in January: 83%
The months with the highest relative humidity are January and July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall in January
Rock Island, IL
- Average rainfall in January: 1.3"
The wettest month (with the highest rainfall) is May (4.49").
The driest month (with the least rainfall) is February (1.1").
Average rainfall days in January
Rock Island, IL
- Average rainfall days in January: 4.3 days
The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (4.3 days).
Average snowfall in January
Rock Island, IL
- Average snowfall in January: 3.98"
The month with the highest snowfall is January (3.98").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in January
Rock Island, IL
- Average snowfall days in January: 10.9 days
The month with the highest number of snowfall days is January (10.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Rock Island, IL
- Average daylight in January: 9h and 36min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in January: 3h and 54min
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 54min).
Average sunshine days in January
Rock Island, IL
- Average sunshine days in January: 16.4 days
The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is May (11.4 days).
Average UV index in January
Rock Island, IL
- Average UV index in January: 1
The months with the highest UV index are July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in January
Rock Island, IL
- Average cloud cover in January: 58
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in January
Rock Island, IL
- Average visibility in January: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
