Mount Summit, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mount Summit, a town in Henry County, Indiana.
Today
81°F
Patchy Fog then Sunny
Patchy fog before 9am. Sunny, with a high near 81. East northeast wind around 2 mph.
7-day forecast for Mount Summit
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 81°F | Patchy Fog then Sunny | 2 mph ENE | 0% |
| Tonight | 61°F | Mostly Clear | 0 mph | 0% |
| Wednesday | 83°F | Sunny | 0 to 3 mph ESE | 0% |
| Wednesday Night | 64°F | Partly Cloudy | 2 mph SSW | 4% |
| Thursday | 83°F | Mostly Sunny then Scattered Showers And Thunderstorms | 2 to 7 mph SW | 48% |
| Thursday Night | 65°F | Scattered Showers And Thunderstorms | 3 mph SW | 62% |
| Friday | 82°F | Chance Showers And Thunderstorms then Scattered Showers And Thunderstorms | 2 to 6 mph SSW | 62% |
| Friday Night | 65°F | Chance Showers And Thunderstorms | 3 mph SW | 52% |
| Saturday | 83°F | Slight Chance Showers And Thunderstorms | 1 to 6 mph SW | 20% |
| Saturday Night | 66°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 3 mph SSW | 20% |
| Sunday | 85°F | Mostly Sunny | 3 to 9 mph SW | 14% |
| Sunday Night | 69°F | Partly Cloudy | 6 mph SW | 14% |
| Monday | 86°F | Mostly Sunny then Chance Showers And Thunderstorms | 6 to 10 mph SW | 26% |
| Monday Night | 68°F | Chance Showers And Thunderstorms | 7 mph SW | 34% |
Forecast source: National Weather Service (api.weather.gov) for Mount Summit (40.004, -85.386). Updated through the day.
Growing snapshot for Mount Summit
Last spring frost
Apr 27
First fall frost
Oct 17
Growing season
173 days
Hardiness zone
6a
More local growing data for Mount Summit: nearby ZIP 47361 weather · frost dates · planting calendar · Indiana frost dates
Nearby towns & communities
Cadiz
Dunreith
Greensboro
Kennard
Knightstown
Lewisville
Middletown
Millville
Mooreland
New Castle
New Lisbon
Shirley
Spiceland
Springport
Straughn
Sulphur Springs
Westwood
Climate data from the nearest NOAA station, New Castle 3 Sw, In (7.6 mi from Mount Summit). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.