Rome, IL climate
Rome has chilly winters and warm summers. A typical July afternoon reaches 86°, a January night drops to 16°, and about 20 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Rome feels like
Winter
Spring
Summer
Fall
Rome weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 33° | 16° | 1.9" | 7.1" | 8 | 17° – 37° |
| February | 38° | 20° | 1.8" | 3.7" | 6 | 16° – 40° |
| March | 50° | 30° | 2.4" | 2.7" | 8 | 33° – 54° |
| April | 64° | 40° | 3.8" | 0.8" | 10 | 44° – 59° |
| May | 74° | 52° | 4.6" | 0 | 10 | 57° – 71° |
| June | 83° | 61° | 4.2" | 0 | 10 | 68° – 76° |
| July | 86° | 65° | 3.9" | 0 | 8 | 70° – 81° |
| August | 84° | 62° | 3.6" | 0 | 8 | 67° – 79° |
| September | 78° | 54° | 3.4" | 0 | 7 | 61° – 71° |
| October | 65° | 43° | 3.0" | 0 | 8 | 49° – 60° |
| November | 50° | 32° | 2.5" | 0.4" | 8 | 33° – 50° |
| December | 38° | 22° | 2.1" | 5.3" | 8 | 16° – 40° |
| Year | 62° | 41° | 37.2" | 20.0" | 97 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Rome
Rome gets 37 inches of rain and melted snow a year. May is the wettest month and February the driest. Rain or snow falls on about 97 days a year.
About 178 frost-free days a year
In half of years the last 32° night comes by April 20 and the first one by October 17. That leaves about 178 frost-free days for gardens, longer than 50% of U.S. towns.
Heating and cooling a home in Rome
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Rome, 83% of that work is heating and 17% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Rome and its neighbors
Rome borders 4 towns with climate data. January nights across them vary by 0.4°. Medina has the coldest January nights (16°) and Chillicothe the hottest July afternoons (86°). Rome’s January low is 16° and its July high 86°.