Photo: Cresthilladmin · CC BY-SA 3.0Winter nights in Crest Hill are colder than in 79% of U.S. towns
On a normal July day the thermometer tops out near 84°. Expect the heaviest rain or snow in May and the lightest in February. It is a dry place: less rain and snow fall here than on 64% of U.S. towns. Keep the boiler serviced for the months from November to April, which average under 50°.
A year in Crest Hill at a glance
Each month’s typical high and low, and what it brings.
What stands out about Crest Hill’s climate
Compared with towns across the U.S., with Crest Hill’s place in Illinois beside it.
What a year in Crest Hill feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 188 frost-free days a year
In half of years the last 32° night comes by April 19 and the first by October 25. Frost and day counts come from NOAA’s station at Joliet Brandon Rd Dam, IL, 5 miles from the town’s center, at about the same height.
The 2023 USDA map puts Crest Hill’s center in zone 6a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −10°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 33 inches of snow a winter
Snow, measured at Romeoville Wfo, IL, falls mostly in January. Precipitation (rain plus melted snow) adds up to 39 inches a year; May is the wettest month and February the driest. Rain or snow falls on about 127 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Crest Hill
88% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Joliet Brandon Rd Dam, IL.
Living with Crest Hill’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
188 frost-free days in zone 6a. The last frost comes by Apr 19 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 25.
Months with highs of 62–84° and lows of 40° or more: May, June, August, September and October. 5.3 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Crest Hill from natural hazards, river flooding is the largest share (37%); heat waves, cold waves, winter storms and ice storms together are 35%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Crest Hill and its neighbors
Every town next door is within a degree of Crest Hill in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Crest Hill’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Crest Hill, IL | 16° | 84° | 39" | 33" |
| Fort Wayne, IN | 18° | 84° | 39" | 34" |
| Sayre, PA | 17° | 84° | 37" | 35" |
| Claverack, NY | 16° | 84° | 42" | 31" |
| Bryan, OH | 18° | 84° | 37" | 29" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
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°).
A smaller shift than in 57% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Crest Hill compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Crest Hill’s place among Illinois’.
Crest Hill weather by month
Highs, lows and precipitation from NOAA’s grid at Crest Hill’s center; snow, wet days and snow on the ground from Romeoville Wfo, IL. 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" | 0.0" | 14 | 0 | 55° – 67° |
| June | 81° | 59° | 4.5" | 0.0" | 12 | 0 | 66° – 75° |
| July | 84° | 64° | 4.2" | 0.0" | 10 | 0 | 69° – 80° |
| August | 83° | 62° | 4.0" | 0.0" | 10 | 0 | 67° – 79° |
| September | 76° | 55° | 3.4" | 0.0" | 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 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 15° to 39°. June is the most reliable, staying within 8°.
Where Crest Hill’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Crest Hill’s center.
- Snow: Romeoville Wfo, IL.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Joliet Brandon Rd Dam, IL, 5 miles from the town’s center, at about the same height; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Crest Hill’s climate
What is the weather like in Crest Hill?
A typical July afternoon reaches 84°, a January night drops to 16°, and about 33 inches of snow falls in a normal winter. Colder January nights than 79% of U.S. towns; cooler July afternoons than 56% of U.S. towns.
How cold does it get in Crest Hill in winter?
January nights average 16°. About 126 nights a year reach 32° or below and 8 reach 0° or below. In the coldest January of the last 30 years the month averaged 14°.
How much snow does Crest Hill get?
About 33 inches in a normal winter at Romeoville Wfo, IL, most of it in January, with snow on the ground about 39 days a year.
How hot does it get in Crest Hill?
July, with a typical high of 84° and a low of 64°. About 15 days a year reach 90° (Joliet Brandon Rd Dam, IL).
When is the first and last frost in Crest Hill?
In half of years the last spring frost (32°) comes by April 19 and the first fall frost by October 25, about 188 frost-free days, at Joliet Brandon Rd Dam, IL.
What growing zone is Crest Hill in?
Zone 6a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −10°.
What is the best time of year to visit Crest Hill?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, August, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Crest Hill getting warmer?
Yes: 1991–2020 averaged 1.3° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 57% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Crest Hill.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.