Climate and monthly weather forecastRome, IL
Climate and monthly weather forecast
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). 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). Weather in January »Weather in February
February, the last month of the winter in Rome, is a cold month, with an average temperature varying between 21.7°F (-5.7°C) and 35.2°F (1.8°C). February's arrival is noted with a slight increase in the average high-temperature, moving from a subzero cold 29.8°F (-1.2°C) in January to a wintry 35.2°F (1.8°C). Weather in February »Weather in March
The first month of the spring, March, is a chilly month in Rome, Illinois, with an average temperature varying between 33.3°F (0.7°C) and 48.2°F (9°C). Rome in March sees a temperature change, with average high-temperatures moving from a wintry 35.2°F (1.8°C) in February to a chilly 48.2°F (9°C). Weather in March »Weather in April
April in Rome, Illinois, is a moderate spring month, with an average temperature varying between 60.1°F (15.6°C) and 43.9°F (6.6°C). April's onset witnesses a shift in the average high-temperature, moving from a frosty 48.2°F (9°C) in March to a mild 60.1°F (15.6°C). Weather in April »Weather in May
May, the last month of the spring in Rome, is an agreeable month, with an average temperature ranging between max 71.2°F (21.8°C) and min 54.1°F (12.3°C). With the onset of May, Rome sees a temperature rise, with the average high-temperature moving from April's refreshing 60.1°F (15.6°C) to an agreeable 71.2°F (21.8°C). Weather in May »Weather in June
June, the first month of the summer in Rome, is a warm month, with temperature in the range of an average high of 79.3°F (26.3°C) and an average low of 62.2°F (16.8°C). A slight uplift of average high-temperatures is noted in June, with temperatures adjusting from an agreeable 71.2°F (21.8°C) in May to a warm 79.3°F (26.3°C). Weather in June »Weather in July
July, the same as June, is another warm summer month in Rome, Illinois, with an average temperature fluctuating between 64.8°F (18.2°C) and 81.9°F (27.7°C). In Rome, July is the warmest month, with temperatures averaging a high of 81.9°F (27.7°C) and a low of 64.8°F (18.2°C). In July, the average heat index is calculated to be a tropical 89.6°F (32°C). Weather in July »Weather in August
The last month of the summer, August, is another warm month in Rome, Illinois, with temperature in the range of an average high of 80.4°F (26.9°C) and an average low of 63°F (17.2°C). The beginning of August records an average high-temperature of a still moderately hot 80.4°F (26.9°C), marking a negligible difference from July's 81.9°F (27.7°C). Weather in August »Weather in September
The first month of the autumn, September, is still a warm month in Rome, Illinois, with an average temperature fluctuating between 75.9°F (24.4°C) and 56.7°F (13.7°C). Rome marks the onset of September with an average high-temperature of a still moderately hot 75.9°F (24.4°C), subtly divergent from August's 80.4°F (26.9°C). Weather in September »Weather in October
October, like September, in Rome, Illinois, is another comfortable autumn month, with an average temperature ranging between min 46°F (7.8°C) and max 61.9°F (16.6°C). The start of October comes with a reduction in the average high-temperature, receding from a warm 75.9°F (24.4°C) in September to an enjoyable 61.9°F (16.6°C). Weather in October »Weather in November
November, the last month of the autumn in Rome, is another chilly month, with an average temperature fluctuating between 47.5°F (8.6°C) and 34.2°F (1.2°C). November's arrival sees a clear drop in the average high-temperature, decreasing from October's comfortable 61.9°F (16.6°C) to a chilly 47.5°F (8.6°C). Weather in November »Weather in December
December, the first month of the winter in Rome, is still a cold month, with an average temperature ranging between min 25.7°F (-3.5°C) and max 36°F (2.2°C). The commencement of December involves a temperature shift, with the average high-temperature dropping from a chilly 47.5°F (8.6°C) in November to a cold 36°F (2.2°C). Weather in December »Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
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.
January is the month with the least rainfall. Rain falls for 4.8 days and accumulates 0.67" (17mm) of precipitation.
In Rome, Illinois, during the entire year, the rain falls for 123.4 days and collects up to 15.12" (384mm) of precipitation.
Months with snowfall in Rome, Illinois, are January through April, October through December.
January is the month with the most snowfall. Snow falls for 9.2 days and accumulates 1.93" (49mm) of snow.
In Rome, during the entire year, snow falls for 27.8 days and aggregates up to 6.46" (164mm) of snow.
The month with the least sunshine is January, with an average of 3.8h of sunshine.
The months with the lowest UV index in Rome, Illinois, are January and December, with an average maximum UV index of 1.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Rome, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.
The month with the most rainfall in Rome, Illinois, is May, when the rain falls for 16.2 days and typically aggregates up to 2.36" (60mm) of precipitation.
May through September are months without snowfall.
The month with the longest days in Rome, Illinois, is June, with an average of 15h and 6min of daylight.
June has the most sunshine of the year, with an average of 10h of sunshine.
The months with the highest UV index in Rome, Illinois, are June and July, with an average maximum UV index of 6.
July tends to be the warmest month in Rome, Illinois, with temperatures averaging a daily high of 81.9°F (27.7°C) and a low of 64.8°F (18.2°C).
With an average relative humidity of 84%, July is the most humid month.
With an average relative humidity of 72%, October is the least humid month in Rome, Illinois.
December has the shortest days of the year, with an average of 9h and 18min of daylight.
Average temperature
Rome, IL
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).
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
Rome, IL
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.94"Hg - Average pressure in May:
29.95"Hg - Average pressure in June:
29.91"Hg
- Average pressure in July:
29.97"Hg - Average pressure in August:
29.97"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.11"Hg - Average pressure in December:
30.11"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
Rome, IL
- Average wind speed in January:
10.4mph - Average wind speed in February:
10.4mph - Average wind speed in March:
10.3mph - Average wind speed in April:
10.6mph - Average wind speed in May:
8.9mph - Average wind speed in June:
7.8mph
- Average wind speed in July:
6.6mph - Average wind speed in August:
6.5mph - Average wind speed in September:
7.6mph - Average wind speed in October:
9.3mph - Average wind speed in November:
10.1mph - Average wind speed in December:
9.8mph
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
Rome, IL
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Rome, IL
- Average rainfall in January:
0.67" - Average rainfall in February:
0.71" - Average rainfall in March:
1.1" - Average rainfall in April:
1.77" - Average rainfall in May:
2.36" - Average rainfall in June:
1.73"
- Average rainfall in July:
1.46" - Average rainfall in August:
1.26" - Average rainfall in September:
1.14" - Average rainfall in October:
1.34" - Average rainfall in November:
0.83" - Average rainfall in December:
0.75"
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
Rome, IL
- Average rainfall days in January:
4.8 days - Average rainfall days in February:
4.5 days - Average rainfall days in March:
11 days - Average rainfall days in April:
13.6 days - Average rainfall days in May:
16.2 days - Average rainfall days in June:
13.8 days
- Average rainfall days in July:
14.3 days - Average rainfall days in August:
11.9 days - Average rainfall days in September:
10.1 days - Average rainfall days in October:
10 days - Average rainfall days in November:
7.5 days - Average rainfall days in December:
5.7 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
Rome, IL
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
Rome, IL
- Average snowfall days in January:
9.2 days - Average snowfall days in February:
7 days - Average snowfall days in March:
2.9 days - Average snowfall days in April:
0.5 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0.1 days - Average snowfall days in November:
1.8 days - Average snowfall days in December:
6.3 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 / Average sunshine
Rome, IL
- Average daylight in January:
9h and 36min - Average daylight in February:
10h and 42min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 18min - Average daylight in May:
14h and 30min - Average daylight in June:
15h and 6min
- Average daylight in July:
14h and 48min - Average daylight in August:
13h and 48min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 6min - Average daylight in November:
9h and 54min - Average daylight in December:
9h and 18min
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 - Average sunshine in February:
4h and 6min - Average sunshine in March:
6h and 30min - Average sunshine in April:
8h and 0min - Average sunshine in May:
8h and 54min - Average sunshine in June:
10h and 0min
- Average sunshine in July:
9h and 54min - Average sunshine in August:
9h and 48min - Average sunshine in September:
9h and 6min - Average sunshine in October:
5h and 48min - Average sunshine in November:
5h and 12min - Average sunshine in December:
4h and 18min
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
Rome, IL
- Average sunshine days in January:
19.4 days - Average sunshine days in February:
17.3 days - Average sunshine days in March:
17.4 days - Average sunshine days in April:
14.7 days - Average sunshine days in May:
12.4 days - Average sunshine days in June:
13.1 days
- Average sunshine days in July:
13 days - Average sunshine days in August:
16.5 days - Average sunshine days in September:
17.8 days - Average sunshine days in October:
19 days - Average sunshine days in November:
20.2 days - Average sunshine days in December:
19.9 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
Rome, IL
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
Rome, IL
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
Rome, IL
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).
