Cave-In-Rock, IL climate
Cave-In-Rock has chilly winters and warm summers, with plenty of rain. A typical July afternoon reaches 89°, a January night drops to 26°, and about 3 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decade14° warmer than normal today. The forecast high is 90°, and a typical Oct 1 in Cave-In-Rock peaks around 76°.Live forecast: National Weather Service · Normal: NOAA 1991–2020
What a year in Cave-In-Rock feels like
Winter
Spring
Summer
Fall
Cave-In-Rock 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 | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 43° | 26° | 3.7" | 0.9" | 10 | 4 | 27° – 44° |
| February | 48° | 29° | 3.7" | 1.4" | 9 | 4 | 26° – 47° |
| March | 57° | 37° | 4.8" | 0.2" | 12 | 1 | 40° – 61° |
| April | 69° | 46° | 4.9" | 0 | 11 | 0 | 51° – 62° |
| May | 77° | 56° | 4.9" | 0 | 11 | 0 | 62° – 73° |
| June | 86° | 65° | 4.3" | 0 | 9 | 0 | 70° – 79° |
| July | 89° | 68° | 4.3" | 0 | 9 | 0 | 73° – 84° |
| August | 88° | 66° | 3.2" | 0 | 7 | 0 | 72° – 84° |
| September | 82° | 59° | 3.4" | 0 | 7 | 0 | 66° – 76° |
| October | 71° | 47° | 3.6" | 0.2" | 8 | 0 | 54° – 64° |
| November | 57° | 37° | 4.1" | 0 | 9 | 0 | 39° – 54° |
| December | 46° | 29° | 4.1" | 0.6" | 10 | 1 | 25° – 47° |
| Year | 68° | 47° | 48.8" | 3.3" | 110 | 9 |
“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 Cave-In-Rock
Cave-In-Rock gets 49 inches of rain and melted snow a year. May is the wettest month and August the driest. Rain or snow falls on about 110 days a year. Snow covers the ground about 9 days of the year.
About 181 frost-free days a year
In half of years the last 32° night comes by April 19 and the first one by October 20. That leaves about 181 frost-free days for gardens, longer than 54% of U.S. towns.
Heating and cooling a home in Cave-In-Rock
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Cave-In-Rock, 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.
How Cave-In-Rock 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 Cave-In-Rock averaged 0.7° warmer than the 1900s. The biggest change is in February (+1.7°). The shift is smaller than in 89% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Cave-In-Rock’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 25° to 47°. June is the most reliable, staying within 10°.
Common questions about Cave-In-Rock’s climate
What is the coldest month in Cave-In-Rock?
January, with a typical high of 43° and a low of 26°.
What is the hottest month in Cave-In-Rock?
July, with a typical high of 89° and a low of 68°. About 31 days a year reach 90°.
How much snow does Cave-In-Rock get?
About 3 inches in a normal winter, most of it in February.
When is the first frost in Cave-In-Rock?
In half of years the first 32° night comes by October 20, and the last spring frost by April 19.
What is the rainiest month in Cave-In-Rock?
May, with 4.9 inches of rain and melted snow. The year totals 49 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Cave-In-Rock itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Rosiclare 5nw, IL (14 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.