Jasper, Indiana Weather
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Climate of Jasper: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), August is usually the hottest month in Jasper, with average daytime highs around 30°C. January is the coolest, when nights typically fall to about -5°C and frost is possible on the coldest nights. That is a wide yearly range of roughly 36°C, so the seasons feel very different from each other.
The area receives about 1270 mm of rain in a typical year. Most of it falls from March to July and October to December (around 73% of the yearly total), and May is the wettest month at roughly 136 mm.
For outdoor plans and travel, August to September usually offer the most comfortable weather in Jasper, with mild days and relatively little rain.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | 4° | -5° | 85 mm | 85% |
| Feb | 6° | -4° | 84 mm | 84% |
| Mar | 12° | 1° | 117 mm | 81% |
| Apr | 19° | 7° | 131 mm | 79% |
| May | 24° | 13° | 136 mm | 80% |
| Jun | 28° | 18° | 119 mm | 79% |
| Jul | 30° | 20° | 115 mm | 77% |
| Aug | 30° | 19° | 81 mm | 72% |
| Sep | 27° | 15° | 90 mm | 70% |
| Oct | 20° | 8° | 106 mm | 73% |
| Nov | 12° | 1° | 101 mm | 78% |
| Dec | 6° | -3° | 102 mm | 85% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Jasper. Values describe typical conditions, not a forecast.
About Jasper weather
Jasper is set in Indiana's humid continental climate, typical of the US Midwest, about 167 km south-west of Indianapolis. Summers bring warm, humid summers (June–August). The year winds down with cold winters (December–February) with regular snow. This page shows live, auto-refreshing weather for Jasper: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/Indiana/Vincennes.
Frequently asked questions
Jasper is about 167 km south-west of Indianapolis, in Indiana.
Jasper sees cold winters (December–February) with regular snow.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Jasper's exact coordinates. No fixed schedule, the page updates whenever you load it.
August is usually the hottest month in Jasper, with average daytime highs of about 30°C and nights around 19°C.
The coldest nights come in January, when the average low is about -5°C and daytime highs reach around 4°C. Frost is possible on clear, calm nights.
Jasper receives about 1270 mm of rain in a typical year. May is the wettest month at roughly 136 mm, and the main rainy period is March to July and October to December.
August to September usually offer the most comfortable weather in Jasper, with mild daytime temperatures and little rain.
In November Jasper typically sees daytime highs near 12°C and lows near 1°C, with about 101 mm of rain over the month and average humidity around 78%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
Live temperature for Jasper is shown at the top of this page and refreshes automatically — see the hourly breakdown below for how it changes through the day.
Jasper's day-to-day weather follows the broader pattern of Indiana described above. See the hourly weather forecast or the air quality index for more detail.