Rooks Creek, IL climate
Rooks Creek has chilly winters and warm summers. A typical July afternoon reaches 85°, a January night drops to 16°, and about 25 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Rooks Creek feels like
Winter
Spring
Summer
Fall
Rooks Creek 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 | 33° | 16° | 2.0" | 6.7" | 9 | 13 | 17° – 36° |
| February | 37° | 20° | 1.8" | 8.0" | 8 | 9 | 15° – 39° |
| March | 49° | 29° | 2.5" | 3.4" | 10 | 2 | 32° – 55° |
| April | 63° | 39° | 3.6" | 0.6" | 11 | 0 | 42° – 58° |
| May | 74° | 51° | 4.6" | 0 | 12 | 0 | 56° – 69° |
| June | 83° | 60° | 4.2" | 0 | 10 | 0 | 67° – 75° |
| July | 85° | 64° | 4.0" | 0 | 9 | 0 | 69° – 81° |
| August | 83° | 62° | 3.6" | 0 | 9 | 0 | 67° – 78° |
| September | 78° | 54° | 3.4" | 0 | 8 | 0 | 61° – 71° |
| October | 65° | 42° | 3.2" | 0 | 8 | 0 | 49° – 60° |
| November | 50° | 32° | 2.6" | 0.7" | 9 | 0 | 33° – 49° |
| December | 38° | 22° | 2.1" | 5.7" | 9 | 6 | 16° – 40° |
| Year | 61° | 41° | 37.5" | 25.1" | 112 | 31 |
“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 Rooks Creek
Rooks Creek 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 112 days a year. Snow covers the ground about 31 days of the year.
About 191 frost-free days a year
In half of years the last 32° night comes by April 16 and the first one by October 24. That leaves about 191 frost-free days for gardens, longer than 65% of U.S. towns.
Heating and cooling a home in Rooks Creek
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Rooks Creek, 85% of that work is heating and 15% 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.
Rooks Creek and its neighbors
Rooks Creek borders 4 towns with climate data. January nights across them vary by 0.5°. Amity has the coldest January nights (16°) and Nebraska the hottest July afternoons (85°). Rooks Creek’s January low is 16° and its July high 85°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Rooks Creek 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 Rooks Creek averaged 1.4° warmer than the 1900s. The biggest change is in December (+2.7°). The shift is larger than in 66% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Rooks Creek’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 16° to 40°. June is the most reliable, staying within 8°.
Common questions about Rooks Creek’s climate
What is the coldest month in Rooks Creek?
January, with a typical high of 33° and a low of 16°.
What is the hottest month in Rooks Creek?
July, with a typical high of 85° and a low of 64°. About 17 days a year reach 90°.
How much snow does Rooks Creek get?
About 25 inches in a normal winter, most of it in February.
When is the first frost in Rooks Creek?
In half of years the first 32° night comes by October 24, and the last spring frost by April 16.
What is the rainiest month in Rooks Creek?
May, with 4.6 inches of rain and melted snow. The year totals 37 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Rooks Creek itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Pontiac, IL (6 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.