Crystal Lawns has chilly winters and warm summers
A typical July afternoon reaches 84°, a January night drops to 16°, and about 17 inches of snow falls in a normal winter.
A year in Crystal Lawns at a glance
Each month’s typical high and low, and what it brings.
What a year in Crystal Lawns feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
17 inches of snow, 39 of rain and melt
May is the wettest month and February the driest. Rain or snow falls on about 123 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
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.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
Living with Crystal Lawns’s climate
What the numbers mean for a garden, a driveway, a furnace and a free afternoon.
188 frost-free days. 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.
About 17" a winter over 7 days with an inch or more, most in February. Snow covers the ground about 28 days a year.
Months averaging under 55° run from October through April. Heating is 88% of the year’s heating-and-cooling load.
About 15 days a year reach 90°, and July afternoons average 84°.
The nicest months are May, June, August, September and October.
Parks & trails →Normals are averages. Ice storms, nor’easters, floods and heat waves are on the natural hazards page.
Natural hazards →Crystal Lawns and its neighbors
Joliet has the coldest January nights next door (16°) and Joliet the hottest July afternoons (85°). Tap a town to see its climate.
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 Crystal Lawns averaged 1.3° warmer than the 1900s. The biggest change is in December (+2.4°).
A bigger shift than in 53% of U.S. towns.
Change by month
How Crystal Lawns compares
Against every U.S. town on TownTapestry, each counted once, with its place in Illinois.
Crystal Lawns 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 | 32° | 16° | 2.0" | 5.0" | 11 | 12 | 14° – 36° |
| February | 36° | 20° | 1.8" | 6.2" | 9 | 8 | 15° – 39° |
| March | 48° | 29° | 2.3" | 2.1" | 10 | 2 | 30° – 54° |
| April | 61° | 39° | 3.8" | 0.1" | 12 | 0 | 41° – 56° |
| May | 72° | 50° | 4.6" | 0 | 12 | 0 | 55° – 67° |
| June | 81° | 59° | 4.5" | 0 | 11 | 0 | 67° – 75° |
| July | 84° | 64° | 4.1" | 0 | 9 | 0 | 69° – 81° |
| August | 83° | 62° | 4.1" | 0 | 9 | 0 | 67° – 79° |
| September | 77° | 55° | 3.3" | 0 | 8 | 0 | 60° – 70° |
| October | 64° | 43° | 3.3" | 0 | 10 | 0 | 49° – 59° |
| November | 49° | 32° | 2.6" | 0.3" | 10 | 0 | 33° – 49° |
| December | 37° | 22° | 2.1" | 3.2" | 11 | 6 | 15° – 39° |
| Year | 60° | 41° | 38.6" | 16.9" | 123 | 28 |
Heating and cooling a home in Crystal Lawns
88% of the work is heating, so the furnace matters far more than the air conditioner.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. Source: NOAA station normals.
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°.
Common questions about Crystal Lawns’s climate
What is the coldest month in Crystal Lawns?
January, with a typical high of 32° and a low of 16°.
What is the hottest month in Crystal Lawns?
July, with a typical high of 84° and a low of 64°. About 15 days a year reach 90°.
How much snow does Crystal Lawns get?
About 17 inches in a normal winter, most of it in February.
When is the first frost in Crystal Lawns?
In half of years the first 32° night comes by October 25, and the last spring frost by April 19.
What is the rainiest month in Crystal Lawns?
May, with 4.6 inches of rain and melted snow. The year totals 39 inches.
Neighbors talk weather
Gardens, snow, and the best days of the year in Crystal Lawns.
Your answer becomes a post in Town Square.
Temperatures and rainfall come from NOAA’s gridded climate normals for Crystal Lawns itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Joliet Brandon Rd Dam, IL (5 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Today’s forecast: National Weather Service.