Photo: Bpluke01 · CC BY-SA 4.0Wet weather: 52 inches of rain and melted snow a year in Simpsonville, more than in 88% of U.S. towns
On a normal January night the air cools to about 24°. A year here swings 63° from midwinter lows to midsummer highs. In July, afternoons here are warmer than in 60% of U.S. towns. The frost-free window for a garden runs roughly May 1 to October 10.
A year in Simpsonville at a glance
Each month’s typical high and low, and what it brings.
What stands out about Simpsonville’s climate
Compared with towns across the U.S., with Simpsonville’s place in Kentucky beside it.
What a year in Simpsonville feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 161 frost-free days a year
In half of years the last 32° night comes by May 1 and the first by October 10. Frost and day counts come from NOAA’s station at Shelbyville 1 E, KY, 8 miles from the town’s center, at about the same height.
The 2023 USDA map puts Simpsonville’s center in zone 6b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −1°. 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 15 inches of snow a winter
Snow, measured at Louisville Wfo, KY, is heaviest from January through February, about 5 inches a month. Precipitation (rain plus melted snow) adds up to 52 inches a year; May is the wettest month and February the driest. Rain or snow falls on about 134 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Simpsonville
84% of the work is heating. Months averaging under 55° run from November through March.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Shelbyville 1 E, KY.
Living with Simpsonville’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
161 frost-free days in zone 6b. The last frost comes by May 1 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 10.
Months with highs of 62–84° and lows of 40° or more: April, May, June, September and October.
Parks & trails →Of the yearly building losses FEMA expects in Simpsonville from natural hazards, river flooding is the largest share (38%); heat waves, cold waves, winter storms and ice storms together are 8%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Simpsonville and similar climates
TownRatings has no climate map of the towns around Simpsonville yet.
Climates most like Simpsonville’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 |
|---|---|---|---|---|
| Simpsonville, KY | 24° | 87° | 52" | 15" |
| Lansdale, PA | 22° | 86° | 49" | 13" |
| Hockessin, DE | 24° | 86° | 48" | 12" |
| Owings Mills, MD | 24° | 87° | 48" | 19" |
| Belle Mead, NJ | 22° | 87° | 49" | 21" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Simpsonville averaged 1.1° warmer than the 1900s. The biggest change is in December (+2.3°).
A smaller shift than in 67% 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 Simpsonville compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Simpsonville’s place among Kentucky’s.
Simpsonville weather by month
Highs, lows and precipitation from NOAA’s grid at Simpsonville’s center; snow, wet days and snow on the ground from Louisville Wfo, KY. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 42° | 24° | 3.6" | 4.6" | 12 | 4 | 25° – 42° |
| February | 46° | 27° | 3.5" | 4.7" | 12 | 4 | 25° – 46° |
| March | 56° | 34° | 4.6" | 2.6" | 13 | 1 | 38° – 57° |
| April | 68° | 44° | 5.1" | 0.1" | 13 | 0 | 49° – 62° |
| May | 76° | 54° | 5.6" | 0.0" | 14 | 0 | 58° – 72° |
| June | 84° | 62° | 5.1" | 0.0" | 12 | 0 | 69° – 77° |
| July | 87° | 66° | 5.0" | 0.0" | 11 | 0 | 71° – 81° |
| August | 86° | 64° | 3.7" | 0.0" | 9 | 0 | 70° – 80° |
| September | 80° | 56° | 3.6" | 0.0" | 8 | 0 | 64° – 75° |
| October | 69° | 45° | 3.8" | 0.0" | 9 | 0 | 53° – 63° |
| November | 56° | 35° | 3.6" | 0.4" | 10 | 0 | 39° – 50° |
| December | 45° | 28° | 4.3" | 2.7" | 13 | 3 | 25° – 47° |
| Year | 66° | 45° | 51.5" | 15.1" | 134 | 11 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 25° to 47°. June is the most reliable, staying within 8°.
Where Simpsonville’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 Simpsonville’s center.
- Snow: Louisville Wfo, KY.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Shelbyville 1 E, KY, 8 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 Simpsonville’s climate
What is the weather like in Simpsonville?
A typical July afternoon reaches 87°, a January night drops to 24°, and about 15 inches of snow falls in a normal winter. Milder January nights than 60% of U.S. towns; hotter July afternoons than 60% of U.S. towns.
How cold does it get in Simpsonville in winter?
January nights average 24°. About 139 nights a year reach 32° or below and 5 reach 0° or below. In the coldest January of the last 30 years the month averaged 25°.
How much snow does Simpsonville get?
About 15 inches in a normal winter at Louisville Wfo, KY, heaviest from January through February, about 5 inches a month, with snow on the ground about 11 days a year.
How hot does it get in Simpsonville?
July, with a typical high of 87° and a low of 66°. About 34 days a year reach 90° (Shelbyville 1 E, KY).
When is the first and last frost in Simpsonville?
In half of years the last spring frost (32°) comes by May 1 and the first fall frost by October 10, about 161 frost-free days, at Shelbyville 1 E, KY.
What growing zone is Simpsonville in?
Zone 6b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −1°.
What is the best time of year to visit Simpsonville?
By one simple rule (highs of 62–84° and lows of 40° or more), April, May, June, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Simpsonville getting warmer?
Yes: 1991–2020 averaged 1.1° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 67% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Simpsonville.
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.