Summers, winters and rain in Mount Summit all run close to those of most U.S. towns
The coldest hours of a January night bottom out at 19° on average. June is the wettest month, February the driest. By July afternoons alone, it runs cooler than 63% of U.S. towns. For walks and days out, the stretch from April to October brings highs of 62–84°.
A year in Mount Summit at a glance
Each month’s typical high and low, and what it brings.
What stands out about Mount Summit’s climate
Compared with towns across the U.S., with Mount Summit’s place in Indiana beside it.
What a year in Mount Summit feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 173 frost-free days a year
In half of years the last 32° night comes by April 27 and the first by October 17. Frost and day counts come from NOAA’s station at New Castle 3 Sw, IN, 8 miles from the town’s center, at about the same height.
The 2023 USDA map puts Mount Summit’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 25 inches of snow a winter
Snow, measured at New Castle 3 Sw, IN, falls mostly in January. Precipitation (rain plus melted snow) adds up to 44 inches a year; June is the wettest month and February the driest. Rain or snow falls on about 131 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Mount Summit
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 New Castle 3 Sw, IN.
Living with Mount Summit’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
173 frost-free days in zone 6a. The last frost comes by Apr 27 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 17.
Months with highs of 62–84° and lows of 40° or more: April, May, June, July, August, September and October.
Parks & trails →Of the yearly building losses FEMA expects in Mount Summit from natural hazards, river flooding is the largest share (52%); heat waves, cold waves, winter storms and ice storms together are 6%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Mount Summit and similar climates
TownRatings has no climate map of the towns around Mount Summit yet.
Climates most like Mount Summit’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 |
|---|---|---|---|---|
| Mount Summit, IN | 19° | 84° | 44" | 25" |
| Bloomsburg, PA | 19° | 84° | 43" | 29" |
| Warren, OH | 19° | 83° | 41" | 28" |
| Essex, CT | 21° | 83° | 47" | 28" |
| Coxsackie, NY | 16° | 84° | 43" | 31" |
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 Mount Summit averaged 1.1° warmer than the 1900s. The biggest change is in December (+2.4°).
A smaller shift than in 72% 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 Mount Summit compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Mount Summit’s place among Indiana’s.
Mount Summit weather by month
Highs, lows and precipitation from NOAA’s grid at Mount Summit’s center; snow, wet days and snow on the ground from New Castle 3 Sw, IN. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 34° | 19° | 3.0" | 7.9" | 13 | 12 | 18° – 39° |
| February | 39° | 22° | 2.4" | 6.4" | 11 | 9 | 18° – 41° |
| March | 49° | 31° | 3.5" | 3.4" | 12 | 3 | 33° – 54° |
| April | 62° | 40° | 4.3" | 0.3" | 13 | 0 | 45° – 57° |
| May | 73° | 51° | 4.8" | 0.0" | 13 | 0 | 55° – 69° |
| June | 81° | 60° | 5.1" | 0.0" | 12 | 0 | 65° – 73° |
| July | 84° | 62° | 4.3" | 0.0" | 11 | 0 | 68° – 79° |
| August | 82° | 61° | 3.6" | 0.0" | 8 | 0 | 67° – 77° |
| September | 77° | 53° | 3.2" | 0.0" | 8 | 0 | 61° – 71° |
| October | 65° | 43° | 3.2" | 0.0" | 9 | 0 | 49° – 60° |
| November | 51° | 33° | 3.5" | 0.9" | 10 | 1 | 35° – 49° |
| December | 39° | 25° | 3.0" | 5.9" | 12 | 6 | 18° – 43° |
| Year | 61° | 42° | 43.8" | 24.8" | 131 | 30 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 18° to 43°. June is the most reliable, staying within 8°.
Where Mount Summit’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 Mount Summit’s center.
- Snow: New Castle 3 Sw, IN.
- Frost, freezing nights, 90° and 100° days, heating and cooling: New Castle 3 Sw, IN, 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 Mount Summit’s climate
What is the weather like in Mount Summit?
A typical July afternoon reaches 84°, a January night drops to 19°, and about 25 inches of snow falls in a normal winter. Colder January nights than 63% of U.S. towns; cooler July afternoons than 63% of U.S. towns.
How cold does it get in Mount Summit in winter?
January nights average 19°. About 132 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 18°.
How much snow does Mount Summit get?
About 25 inches in a normal winter at New Castle 3 Sw, IN, most of it in January, with snow on the ground about 30 days a year.
How hot does it get in Mount Summit?
July, with a typical high of 84° and a low of 62°. About 9 days a year reach 90° (New Castle 3 Sw, IN).
When is the first and last frost in Mount Summit?
In half of years the last spring frost (32°) comes by April 27 and the first fall frost by October 17, about 173 frost-free days, at New Castle 3 Sw, IN.
What growing zone is Mount Summit 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 Mount Summit?
By one simple rule (highs of 62–84° and lows of 40° or more), April, May, June, July, August, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Mount Summit getting warmer?
Yes: 1991–2020 averaged 1.1° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 72% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Mount Summit.
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.