Photo: TCP04 · CC BY 4.0Lexington has colder winter nights than 78% of U.S. towns
On a normal July day the thermometer tops out near 85°. From frosty January to warm July, readings climb 68°. By precipitation alone, it ranks drier than 69% of U.S. towns. Seedlings are safe outdoors from about April 23, with the first autumn frost due around October 15.
A year in Lexington at a glance
Each month’s typical high and low, and what it brings.
What stands out about Lexington’s climate
Compared with towns across the U.S., with Lexington’s place in Illinois beside it.
What a year in Lexington feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 174 frost-free days a year
In half of years the last 32° night comes by April 23 and the first by October 15. Frost and day counts come from NOAA’s station at Chenoa, IL, 7 miles from the town’s center, at about the same height.
The 2023 USDA map puts Lexington’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 20 inches of snow a winter
Snow, measured at Chenoa, IL, falls mostly in January and December. Precipitation (rain plus melted snow) adds up to 38 inches a year; May is the wettest month and February the driest. Rain or snow falls on about 96 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Lexington
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 Chenoa, IL.
Living with Lexington’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
174 frost-free days in zone 6a. The last frost comes by Apr 23 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 15.
Months with highs of 62–84° and lows of 40° or more: May, June, August, September and October. 1.4 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Lexington from natural hazards, river flooding is the largest share (44%); heat waves, cold waves, winter storms and ice storms together are 28%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Lexington and its neighbors
Every town next door is within a degree of Lexington in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Lexington’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 |
|---|---|---|---|---|
| Lexington, IL | 17° | 85° | 38" | 20" |
| Centerville, IA | 15° | 85° | 38" | 22" |
| Defiance, OH | 19° | 85° | 37" | 24" |
| Wabash, IN | 19° | 84° | 40" | 20" |
| Savannah, MO | 18° | 87° | 37" | 21" |
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 Lexington averaged 1.5° warmer than the 1900s. The biggest change is in December (+2.8°).
A bigger shift than in 58% 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 Lexington compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Lexington’s place among Illinois’.
Lexington weather by month
Highs, lows and precipitation from NOAA’s grid at Lexington’s center; snow, wet days and snow on the ground from Chenoa, IL. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 33° | 17° | 2.1" | 5.3" | 7 | 12 | 18° – 37° |
| February | 38° | 20° | 1.8" | 4.8" | 5 | 8 | 16° – 40° |
| March | 50° | 30° | 2.6" | 2.3" | 8 | 2 | 33° – 55° |
| April | 63° | 39° | 3.7" | 0.8" | 11 | 0 | 42° – 58° |
| May | 74° | 51° | 4.5" | 0.0" | 11 | 0 | 56° – 70° |
| June | 83° | 60° | 4.1" | 0.0" | 9 | 0 | 67° – 75° |
| July | 85° | 64° | 4.0" | 0.0" | 8 | 0 | 69° – 81° |
| August | 83° | 61° | 3.6" | 0.0" | 8 | 0 | 67° – 78° |
| September | 78° | 54° | 3.2" | 0.0" | 7 | 0 | 60° – 71° |
| October | 65° | 42° | 3.2" | 0.0" | 9 | 0 | 49° – 59° |
| November | 50° | 32° | 2.7" | 1.3" | 8 | 1 | 33° – 49° |
| December | 38° | 22° | 2.1" | 5.4" | 7 | 6 | 16° – 40° |
| Year | 62° | 41° | 37.6" | 19.9" | 96 | 29 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 16° to 40°. June is the most reliable, staying within 8°.
Where Lexington’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 Lexington’s center.
- Snow: Chenoa, IL.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Chenoa, IL, 7 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 Lexington’s climate
What is the weather like in Lexington?
A typical July afternoon reaches 85°, a January night drops to 17°, and about 20 inches of snow falls in a normal winter. Colder January nights than 78% of U.S. towns; cooler July afternoons than 52% of U.S. towns.
How cold does it get in Lexington in winter?
January nights average 17°. About 127 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 18°.
How much snow does Lexington get?
About 20 inches in a normal winter at Chenoa, IL, most of it in January and December, with snow on the ground about 29 days a year.
How hot does it get in Lexington?
July, with a typical high of 85° and a low of 64°. About 23 days a year reach 90° (Chenoa, IL).
When is the first and last frost in Lexington?
In half of years the last spring frost (32°) comes by April 23 and the first fall frost by October 15, about 174 frost-free days, at Chenoa, IL.
What growing zone is Lexington 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 Lexington?
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 Lexington getting warmer?
Yes: 1991–2020 averaged 1.5° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 58% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Lexington.
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.