Jasper (IN) Temperature by Month
The average annual maximum temperature in Jasper, Indiana, United States of America is 19°C (66°F), with daytime highs ranging from 5°C (41°F) in January to 30°C (86°F) in July. This page covers monthly averages, day-night differences, and how Jasper compares to cities worldwide.
Jasper Monthly Temperatures
Visitors to Jasper can expect significant temperature changes throughout the year. Nighttime temperatures also vary widely, ranging from 19°C (66°F) in July to -5°C (23°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Jasper by month:
From around 4 AM to 6 AM temperatures are at their lowest; by 3 PM they've climbed to their daily peak. July, the warmest month, averages 322 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Jasper vs the United States of America
The map below shows the annual temperature across the United States of America. You can also select individual months if you want to compare a specific time of year.
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Jasper vs World: Temperature Compared
Jasper's average annual maximum temperature is 19°C (66°F). To put that in context, here's how it compares to a few well-known destinations:
Lisbon, Portugal averages 21°C (70°F) annually — warm summers, mild winters, and rain mainly in the cooler months.
On the cooler end, Oslo, Norway averages just 10°C (50°F) annually, with pleasant summers but long, cold winters.
Osaka, Japan averages 22°C (72°F) annually, with hot humid summers, mild winters, and pleasant spring and autumn seasons.
Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate — hot dry summers and mild wet winters.
What Does the Temperature Feel Like in Jasper?
Temperature alone doesn't tell the whole story — humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.
In the cooler months, when temperatures drop below 10°C, high humidity makes the cold feel more cutting than it would in dry conditions.
In Jasper, January is the coolest month, with average highs of 5°C (41°F) and humidity around 72% — considered high. In July, the warmest month, temperatures average 30°C (86°F) with 71% humidity — conditions that feel high. For a full picture, see our humidity page.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
Seasonal temperature shifts influence more than just how warm it feels — they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.
Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Jasper this rarely lasts long on the ground.
For more on Jasper's weather — including monthly rainfall, sunshine hours, and humidity — visit our Jasper climate page.
