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
January, noted for its average high-temperature of 29.3°F (-1.5°C) and an average low-temperature of 17.4°F (-8.1°C), is considered the coldest month.Humidity
In Rockdale, the average relative humidity in January is 82%.Rainfall
In Rockdale, in January, during 6.8 rainfall days, 1.85" (47mm) of precipitation is typically accumulated. Throughout the year, there are 153.6 rainfall days, and 32.72" (831mm) of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall. The month with the most snowfall is January, when snow falls for 11.9 days and typically aggregates up to 4.33" (110mm) of snow.Daylight
In January, the average length of the day is 9h and 35min.On the first day of January, sunrise is at 7:18 am and sunset at 4:32 pm. On the last day of the month, sunrise is at 7:05 am and sunset at 5:06 pm CST.
Sunshine
With an average of 3.7h of sunshine, January has the least sunshine of the year.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index in Rockdale. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 1 in January interprets into the following recommendations:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Stay sun-safe with clothing that is both closely woven and worn loosely. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What month is the coldest?
How cold is January?
What is the average humidity in January?
How much does it rain in Rockdale in January?
When does it snow the most?
How much does it snow in Rockdale in January?
What is the average length of the day in January in Rockdale?
When is the sunrise / sunset in January?
What is the month with the least sunshine?
How long on average sun shines in January in Rockdale?
When is the lowest UV index?
What is the UV index reading in January?
Average temperature in January
Rockdale, IL
- Average high temperature in January: 29.3°F
The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (29.3°F).
- Average low temperature in January: 17.4°F
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (17.4°F).
Average pressure in January
Rockdale, IL
- Average pressure in January: 30.12"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in January
Rockdale, IL
- Average wind speed in January: 9.5mph
The windiest month (with the highest average wind speed) is April (9.7mph).
The calmest month (with the lowest average wind speed) is August (5.9mph).
Average humidity in January
Rockdale, IL
- Average humidity in January: 82%
The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is October (73%).
Average rainfall in January
Rockdale, IL
- Average rainfall in January: 1.85"
The wettest month (with the highest rainfall) is May (4.41").
The driest month (with the least rainfall) is February (1.61").
Average rainfall days in January
Rockdale, IL
- Average rainfall days in January: 6.8 days
The month with the highest number of rainy days is July (17.9 days).
The month with the least rainy days is February (5.7 days).
Average snowfall in January
Rockdale, IL
- Average snowfall in January: 4.33"
The month with the highest snowfall is January (4.33").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in January
Rockdale, IL
- Average snowfall days in January: 11.9 days
The month with the highest number of snowfall days is January (11.9 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
Rockdale, IL
- Average daylight in January: 9h and 4min
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 4min
The month with the most sunshine is August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in January
Rockdale, IL
- Average sunshine days in January: 14.4 days
The month with the most sunshine days is November (18.1 days).
The month with the least sunshine days is June (10.4 days).
Average UV index in January
Rockdale, IL
- 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
Rockdale, IL
- Average cloud cover in January: 60
The month with the most cloud cover is January (Cloud cover 60).
The months with the least cloud cover are August and September (Cloud cover 34).
Average visibility in January
Rockdale, IL
- Average visibility in January: 5mi
The months with the highest visibility are March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, February, July and August (5mi).
Rockdale, Illinois, USA
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