Cotton Hill, IL climate
Cotton Hill has chilly winters and warm summers. A typical July afternoon reaches 86°, a January night drops to 20°, and about 14 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decade10° warmer than normal today. The forecast high is 83°, and a typical Oct 1 in Cotton Hill peaks around 73°.Live forecast: National Weather Service · Normal: NOAA 1991–2020
What a year in Cotton Hill feels like
Winter
Spring
Summer
Fall
Cotton Hill 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 | 35° | 20° | 2.2" | 5.6" | 9 | 21° – 39° |
| February | 41° | 23° | 2.0" | 4.0" | 8 | 20° – 42° |
| March | 52° | 33° | 2.8" | 1.1" | 10 | 35° – 57° |
| April | 65° | 42° | 4.3" | 0.2" | 11 | 47° – 60° |
| May | 75° | 53° | 4.5" | 0 | 12 | 59° – 73° |
| June | 84° | 62° | 4.5" | 0 | 10 | 68° – 76° |
| July | 86° | 65° | 3.8" | 0 | 9 | 71° – 83° |
| August | 85° | 63° | 3.5" | 0 | 7 | 69° – 80° |
| September | 80° | 55° | 3.1" | 0 | 8 | 62° – 72° |
| October | 67° | 44° | 3.2" | 0.1" | 9 | 51° – 61° |
| November | 52° | 34° | 3.1" | 0.5" | 9 | 35° – 50° |
| December | 40° | 25° | 2.3" | 2.4" | 9 | 19° – 42° |
| Year | 64° | 43° | 39.3" | 13.9" | 110 |
“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 Cotton Hill
Cotton Hill gets 39 inches of rain and melted snow a year. May is the wettest month and February the driest. Rain or snow falls on about 110 days a year.
About 187 frost-free days a year
In half of years the last 32° night comes by April 14 and the first one by October 20. That leaves about 187 frost-free days for gardens, longer than 60% of U.S. towns.
Heating and cooling a home in Cotton Hill
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Cotton Hill, 81% of that work is heating and 19% 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.
Cotton Hill and its neighbors
Cotton Hill borders 6 towns with climate data. January nights across them vary by 0.4°. Rochester has the coldest January nights (19°) and South Fork the hottest July afternoons (86°). Cotton Hill’s January low is 20° and its July high 86°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Cotton Hill compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Cotton Hill averaged 0.9° warmer than the 1900s. The biggest change is in December (+2.0°). The shift is smaller than in 76% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Cotton Hill’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. December swings the most: between 1991 and 2020 its average temperature ranged from 19° to 42°. June is the most reliable, staying within 8°.
Common questions about Cotton Hill’s climate
What is the coldest month in Cotton Hill?
January, with a typical high of 35° and a low of 20°.
What is the hottest month in Cotton Hill?
July, with a typical high of 86° and a low of 65°. About 28 days a year reach 90°.
How much snow does Cotton Hill get?
About 14 inches in a normal winter, most of it in January.
When is the first frost in Cotton Hill?
In half of years the first 32° night comes by October 20, and the last spring frost by April 14.
What is the rainiest month in Cotton Hill?
May, with 4.5 inches of rain and melted snow. The year totals 39 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Cotton Hill itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Kincaid 3w, IL (7 mi, snow) and Springfield Capital Airport, IL (15 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.