Crest Hill, IL climate
Crest Hill has chilly, snowy winters and warm summers. A typical July afternoon reaches 84°, a January night drops to 16°, and about 33 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Crest Hill feels like
Winter
Spring
Summer
Fall
Crest 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 | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 31° | 16° | 2.1" | 10.6" | 10 | 15 | 14° – 36° |
| February | 36° | 20° | 1.8" | 8.7" | 10 | 11 | 15° – 39° |
| March | 48° | 29° | 2.4" | 4.2" | 11 | 3 | 30° – 54° |
| April | 61° | 39° | 3.9" | 0.9" | 12 | 0 | 41° – 56° |
| May | 72° | 50° | 4.5" | 0 | 14 | 0 | 55° – 67° |
| June | 81° | 59° | 4.5" | 0 | 12 | 0 | 66° – 75° |
| July | 84° | 64° | 4.2" | 0 | 10 | 0 | 69° – 80° |
| August | 83° | 62° | 4.0" | 0 | 10 | 0 | 67° – 79° |
| September | 76° | 55° | 3.4" | 0 | 8 | 0 | 60° – 70° |
| October | 64° | 43° | 3.4" | 0.1" | 11 | 0 | 49° – 59° |
| November | 49° | 32° | 2.6" | 1.2" | 9 | 1 | 33° – 49° |
| December | 36° | 22° | 2.1" | 7.5" | 11 | 9 | 15° – 39° |
| Year | 60° | 41° | 38.8" | 33.2" | 127 | 39 |
“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 Crest Hill
Crest 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 127 days a year. Snow covers the ground about 39 days of the year.
About 184 frost-free days a year
In half of years the last 32° night comes by April 20 and the first one by October 22. That leaves about 184 frost-free days for gardens, longer than 57% of U.S. towns.
Heating and cooling a home in Crest Hill
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Crest Hill, 86% of that work is heating and 14% 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.
Crest Hill and its neighbors
Crest Hill borders 4 towns with climate data. January nights across them vary by 0.2°. Sunnyland has the coldest January nights (16°) and Joliet the hottest July afternoons (85°). Crest Hill’s January low is 16° and its July high 84°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Crest 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 Crest Hill averaged 1.3° warmer than the 1900s. The biggest change is in December (+2.4°). The shift is larger than in 54% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Crest Hill’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. February swings the most: between 1991 and 2020 its average temperature ranged from 15° to 39°. June is the most reliable, staying within 8°.
Common questions about Crest Hill’s climate
What is the coldest month in Crest Hill?
January, with a typical high of 31° and a low of 16°.
What is the hottest month in Crest Hill?
July, with a typical high of 84° and a low of 64°. About 16 days a year reach 90°.
How much snow does Crest Hill get?
About 33 inches in a normal winter, most of it in January.
When is the first frost in Crest Hill?
In half of years the first 32° night comes by October 22, and the last spring frost by April 20.
What is the rainiest month in Crest 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 Crest Hill itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Romeoville Wfo, IL (3 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.