Photo: John Schanlaub · CC BY 2.0A middle-of-the-road climate: Thorntown is close to most U.S. towns on every count
July afternoons average 84°. The seasons are far apart: from a winter night to a summer afternoon the average spans 65°. In January, nights here are colder than in 68% of U.S. towns. Central heating does most of its work from November to March, in months below 50° on average.
A year in Thorntown at a glance
Each month’s typical high and low, and what it brings.
What stands out about Thorntown’s climate
Compared with towns across the U.S., with Thorntown’s place in Indiana beside it.
What a year in Thorntown feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 181 frost-free days a year
In half of years the last 32° night comes by April 21 and the first by October 21. Frost and day counts come from NOAA’s station at Frankfort Disposal, IN, 13 miles from the town’s center, at about the same height.
The 2023 USDA map puts Thorntown’s center in zone 6a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −8°. 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 18 inches of snow a winter
Snow, measured at Lebanon 6w, IN, falls mostly in January and December. Precipitation (rain plus melted snow) adds up to 42 inches a year; June is the wettest month and February the driest. Rain or snow falls on about 125 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Thorntown
86% 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 Frankfort Disposal, IN.
Living with Thorntown’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
181 frost-free days in zone 6a. The last frost comes by Apr 21 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 21.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August, September and October. 0.1 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Thorntown from natural hazards, river flooding is the largest share (62%); heat waves, cold waves, winter storms and ice storms together are 13%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Thorntown and similar climates
TownRatings has no climate map of the towns around Thorntown yet.
Climates most like Thorntown’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 |
|---|---|---|---|---|
| Thorntown, IN | 18° | 84° | 42" | 18" |
| Urbana, OH | 20° | 84° | 42" | 19" |
| Beaver Falls, PA | 20° | 84° | 41" | 20" |
| Wheeling, WV | 22° | 84° | 42" | 15" |
| Wytheville, VA | 24° | 83° | 42" | 18" |
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 Thorntown averaged 1.1° warmer than the 1900s. The biggest change is in December (+2.4°).
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 Thorntown compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Thorntown’s place among Indiana’s.
Thorntown weather by month
Highs, lows and precipitation from NOAA’s grid at Thorntown’s center; snow, wet days and snow on the ground from Lebanon 6w, IN. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 34° | 18° | 2.8" | 5.5" | 11 | 9 | 18° – 38° |
| February | 38° | 21° | 2.3" | 4.2" | 10 | 8 | 17° – 41° |
| March | 50° | 30° | 3.1" | 2.2" | 11 | 1 | 33° – 55° |
| April | 62° | 40° | 4.1" | 0.2" | 12 | 0 | 44° – 57° |
| May | 73° | 51° | 4.6" | 0.0" | 13 | 0 | 55° – 70° |
| June | 81° | 60° | 5.0" | 0.0" | 12 | 0 | 66° – 73° |
| July | 84° | 63° | 4.6" | 0.0" | 10 | 0 | 68° – 79° |
| August | 82° | 61° | 3.5" | 0.0" | 9 | 0 | 67° – 78° |
| September | 77° | 53° | 3.1" | 0.0" | 8 | 0 | 60° – 70° |
| October | 65° | 43° | 3.3" | 0.0" | 10 | 0 | 50° – 60° |
| November | 50° | 33° | 3.4" | 0.7" | 10 | 0 | 34° – 49° |
| December | 39° | 24° | 2.7" | 5.3" | 11 | 6 | 17° – 41° |
| Year | 61° | 41° | 42.3" | 18.1" | 125 | 24 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 17° to 41°. June is the most reliable, staying within 7°.
Where Thorntown’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 Thorntown’s center.
- Snow: Lebanon 6w, IN.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Frankfort Disposal, IN, 13 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 Thorntown’s climate
What is the weather like in Thorntown?
A typical July afternoon reaches 84°, a January night drops to 18°, and about 18 inches of snow falls in a normal winter. Colder January nights than 68% of U.S. towns; cooler July afternoons than 65% of U.S. towns.
How cold does it get in Thorntown in winter?
January nights average 18°. About 119 nights a year reach 32° or below and 6 reach 0° or below. In the coldest January of the last 30 years the month averaged 18°.
How much snow does Thorntown get?
About 18 inches in a normal winter at Lebanon 6w, IN, most of it in January and December, with snow on the ground about 24 days a year.
How hot does it get in Thorntown?
July, with a typical high of 84° and a low of 63°. About 13 days a year reach 90° (Frankfort Disposal, IN).
When is the first and last frost in Thorntown?
In half of years the last spring frost (32°) comes by April 21 and the first fall frost by October 21, about 181 frost-free days, at Frankfort Disposal, IN.
What growing zone is Thorntown in?
Zone 6a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −8°.
What is the best time of year to visit Thorntown?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Thorntown 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 Thorntown.
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.