January weather forecastRome, IL

January

Weather in January

January, like December, is another subzero cold winter month in Rome, Illinois, with an average temperature fluctuating between 29.8°F (-1.2°C) and 18.1°F (-7.7°C).

Temperature

The coldest month is January, with an average high-temperature of 29.8°F (-1.2°C) and an average low-temperature of 18.1°F (-7.7°C).

Humidity

In January, the average relative humidity in Rome is 82%.

Rainfall

January is the month with the least rainfall in Rome. Rain falls for 4.8 days and accumulates 0.67" (17mm) of precipitation.

Snowfall

January through April, October through December are months with snowfall in Rome. The month with the most snowfall is January, when snow falls for 9.2 days and typically aggregates up to 1.93" (49mm) of snow.

Daylight

In January, the average length of the day is 9h and 38min.
On the first day of the month, sunrise is at 7:22 am and sunset at 4:40 pm. On the last day of January, sunrise is at 7:09 am and sunset at 5:13 pm CST.

Sunshine

January has the least sunshine of the year, with an average of 3.8h 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 minimal health vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: An average maximum UV index of 1 in January leads to these recommendations:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.

Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Rome reaches its average lowest temperatures in January, measuring 29.8°F (-1.2°C) at the peak and 18.1°F (-7.7°C) at the lowest.

In January, in Rome, the average high-temperature is 29.8°F (-1.2°C), and the average low-temperature is 18.1°F (-7.7°C).

In January, the average relative humidity is 82%.

January is the month with the least rainfall. Rain falls for 4.8 days and accumulates 0.67" (17mm) of precipitation.

In January, in Rome, Illinois, the rain falls for 4.8 days. Throughout January, 0.67" (17mm) of precipitation is accumulated.

January is the month with the most snowfall. Snow falls for 9.2 days and accumulates 1.93" (49mm) of snow.

In January, in Rome, Illinois, it is snowing for 9.2 days. Throughout January, 1.93" (49mm) of snow is accumulated.

The average day length in January in Rome, Illinois, is 9h and 38min.

In January, on the first day of the month, sunrise is at 7:22 am and sunset at 4:40 pm. On the last day of the month, in Rome, sunrise is at 7:09 am and sunset at 5:13 pm CST.

The month with the least sunshine in Rome, Illinois, is January, with an average of 3.8h of sunshine.

In January, the average sunshine duration in Rome is 3.8h.

The months with the lowest UV index in Rome, Illinois, are January and December, with an average maximum UV index of 1.

In Rome, Illinois, the average daily maximum UV index in January is 1. A UV Index of 2, and less, symbolizes a low health threat from exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year January F M A M J J A S O N D

Dec

January

Feb

Average high temperature

36°F

29.8°F

35.2°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

10.4mph

11.1mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

19.9

19.4

17.3

Average UV index

Average cloud cover

Average visibility

Average temperature in January
Rome, IL

Average high temperature in January: 29.8°F

The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (29.8°F).

Average low temperature in January: 18.1°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 (18.1°F).

Average pressure in January
Rome, IL

Average pressure in January: 30.14"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed in January
Rome, IL

Average wind speed in January: 10.4mph

The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).

Average humidity in January
Rome, IL

Average humidity in January: 82%

The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (72%).

Average rainfall in January
Rome, IL

Average rainfall in January: 0.67"

The wettest month (with the highest rainfall) is May (2.36").
The driest month (with the least rainfall) is January (0.67").

Average rainfall days in January
Rome, IL

Average rainfall days in January: 4.8 days

The month with the highest number of rainy days is May (16.2 days).
The month with the least rainy days is February (4.5 days).

Average snowfall in January
Rome, IL

Average snowfall in January: 1.93"

The month with the highest snowfall is January (1.93").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in January
Rome, IL

Average snowfall days in January: 9.2 days

The month with the highest number of snowfall days is January (9.2 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
Rome, 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 18min).

Average sunshine in January: 3h and 48min

The month with the most sunshine is June (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).

Average sunshine days in January
Rome, IL

Average sunshine days in January: 19.4 days

The month with the most sunshine days is November (20.2 days).
The month with the least sunshine days is May (12.4 days).

Average UV index in January
Rome, 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
Rome, 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 September (Cloud cover 31).

Average visibility in January
Rome, IL

Average visibility in January: 6mi

The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).