Photo: Nyttend · Public domainJanuary in Cromwell bites harder than in 75% of U.S. towns
High summer brings afternoon highs near 83°. Its July afternoons stay fresher than in 70% of U.S. towns. Warming shows here too: 1.3° more than in 1901–2000, led by December. Warm coats and heating bills mark the months from November to April, when means dip under 50°.
A year in Cromwell at a glance
Each month’s typical high and low, and what it brings.
What stands out about Cromwell’s climate
Compared with towns across the U.S., with Cromwell’s place in Indiana beside it.
What a year in Cromwell feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 182 frost-free days a year
In half of years the last 32° night comes by April 24 and the first by October 24. Frost and day counts come from NOAA’s station at Northern Indiana Wfo, IN, 5 miles from the town’s center, at about the same height.
The 2023 USDA map puts Cromwell’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 24 inches of snow a winter
Snow, measured at Ligonier 2 S, IN, falls mostly in January. 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 114 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Cromwell
89% 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 Northern Indiana Wfo, IN.
Living with Cromwell’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
182 frost-free days in zone 6a. The last frost comes by Apr 24 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 24.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August, September and October.
Parks & trails →Of the yearly building losses FEMA expects in Cromwell from natural hazards, river flooding is the largest share (47%); heat waves, cold waves, winter storms and ice storms together are 10%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Cromwell and similar climates
TownRatings has no climate map of the towns around Cromwell yet.
Climates most like Cromwell’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 |
|---|---|---|---|---|
| Cromwell, IN | 17° | 83° | 38" | 24" |
| Wadsworth, OH | 20° | 83° | 39" | 29" |
| Plano, IL | 15° | 84° | 38" | 28" |
| Eldridge, IA | 14° | 84° | 38" | 29" |
| Harper Woods, MI | 19° | 83° | 34" | 28" |
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 Cromwell averaged 1.3° warmer than the 1900s. The biggest change is in December (+2.6°).
A smaller shift than in 55% 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 Cromwell compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Cromwell’s place among Indiana’s.
Cromwell weather by month
Highs, lows and precipitation from NOAA’s grid at Cromwell’s center; snow, wet days and snow on the ground from Ligonier 2 S, IN. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 32° | 17° | 2.4" | 9.5" | 11 | 15° – 36° |
| February | 36° | 19° | 1.9" | 3.6" | 7 | 14° – 38° |
| March | 47° | 28° | 2.3" | 3.3" | 9 | 28° – 52° |
| April | 60° | 38° | 3.6" | 0.7" | 11 | 42° – 54° |
| May | 71° | 49° | 4.2" | 0.0" | 12 | 53° – 67° |
| June | 80° | 58° | 4.2" | 0.0" | 11 | 64° – 73° |
| July | 83° | 62° | 3.9" | 0.0" | 10 | 67° – 79° |
| August | 81° | 60° | 3.9" | 0.0" | 9 | 66° – 76° |
| September | 75° | 52° | 3.1" | 0.0" | 8 | 59° – 68° |
| October | 63° | 42° | 3.1" | 0.2" | 8 | 48° – 59° |
| November | 48° | 32° | 2.8" | 1.3" | 10 | 33° – 47° |
| December | 37° | 23° | 2.4" | 5.3" | 10 | 16° – 40° |
| Year | 59° | 40° | 37.7" | 23.9" | 114 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 14° to 38°. September is the most reliable, staying within 9°.
Where Cromwell’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 Cromwell’s center.
- Snow: Ligonier 2 S, IN.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Northern Indiana Wfo, IN, 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 Cromwell’s climate
What is the weather like in Cromwell?
A typical July afternoon reaches 83°, a January night drops to 17°, and about 24 inches of snow falls in a normal winter. Colder January nights than 75% of U.S. towns; cooler July afternoons than 70% of U.S. towns.
How cold does it get in Cromwell in winter?
January nights average 17°. About 126 nights a year reach 32° or below and 7 reach 0° or below. In the coldest January of the last 30 years the month averaged 15°.
How much snow does Cromwell get?
About 24 inches in a normal winter at Ligonier 2 S, IN, most of it in January.
How hot does it get in Cromwell?
July, with a typical high of 83° and a low of 62°. About 9 days a year reach 90° (Northern Indiana Wfo, IN).
When is the first and last frost in Cromwell?
In half of years the last spring frost (32°) comes by April 24 and the first fall frost by October 24, about 182 frost-free days, at Northern Indiana Wfo, IN.
What growing zone is Cromwell 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 Cromwell?
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 Cromwell getting warmer?
Yes: 1991–2020 averaged 1.3° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 55% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Cromwell.
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.