Jasper climate — normals and trends
Jasper (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 13.2 °C and it receives 1,147 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (25.3 °C on average) and the coldest is January (-0.2 °C). Rainfall peaks in May.
Jasper averages 81 frost days, 54 hot days (≥ 30 °C) and 121 rainy days per year.
Jasper has warmed by +1.6 °C between 1940 and 2025, or +0.18 °C per decade. This trend is statistically significant.
The number of frost days there went from about 92 to 70 per year over the period.
The hottest day of the period reached 40.5 °C (on 29 June 2012) and the coldest -30.1 °C (on 22 December 1989).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
JasperIndiana
- coords
- 38.39°, -86.93°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
13.2°C
Average daily high
18.3°C
Average daily low
8.7°C
Annual rainfall
1,147mm
Sunshine / day
8.9h
Mean relative humidity
69%
Average peak wind
15.8km/h
Seasonal range
25.5°C
Frost days (< 0 °C)
81 d/yr
Hot days (≥ 30 °C)
54 d/yr
Rainy days (≥ 1 mm)
121 d/yr
Annual snowfall
35.2 cm
Average feels-like high
17.4 °C
Average feels-like low
6.7 °C
Average peak gust
36.1 km/h
Tropical nights (≥ 20 °C)
58 d/yr
Solar radiation
15.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.6 °C
since 1940
+0.2 °C per decade · r² = 0.30 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
40.5 °C
29 June 2012
Coldest day
-30.1 °C
22 December 1989
Wettest day
127 mm
9 March 1964
Windiest day
45.0 km/h
14 September 2008
Strongest gust
119.5 km/h
11 January 2020
Hottest feels-like
44.1 °C
6 July 2012
Coldest feels-like
-36.4 °C
20 January 1985
Snowiest day
35.2 cm
19 March 1996
Sunniest day
14.2 h
16 June 2024
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 1.6 °C | -2.4 °C | 81 mm | -6 mm |
| Feb | 6.8 °C | +0.1 °C | 130 mm | +44 mm |
| Mar | 17.0 °C | +4.6 °C | 140 mm | +26 mm |
| Apr | 20.5 °C | +1.7 °C | 230 mm | +109 mm |
| May | 23.0 °C | -0.9 °C | 156 mm | +33 mm |
| Jun | 29.4 °C | +0.8 °C | 185 mm | +84 mm |
| Jul | 31.2 °C | +0.9 °C | 177 mm | +83 mm |
| Aug | 28.9 °C | -0.8 °C | 35 mm | -46 mm |
| Sep | 28.5 °C | +2.2 °C | 91 mm | +14 mm |
| Oct | 21.2 °C | +1.2 °C | 81 mm | +4 mm |
| Nov | 13.3 °C | +1.1 °C | 102 mm | +7 mm |
| Dec | 6.8 °C | +0.5 °C | 52 mm | -39 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Jasper?
Jasper has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 13.2 °C and it receives 1,147 mm of precipitation per year.
What is the hottest day ever recorded in Jasper?
The hottest day measured in Jasper between 1940 and 2025 was 29 June 2012, reaching 40.5 °C.
What is the coldest day in Jasper?
The coldest day measured in Jasper between 1940 and 2025 was 22 December 1989, at -30.1 °C.
Does it snow in Jasper?
Yes. Jasper gets on average 35.2 cm of snow per year and has around 81 frost days.
Has the climate of Jasper warmed?
Yes: Jasper warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Jasper?
The wettest day measured in Jasper between 1940 and 2025 was 9 March 1964, with 127 mm of rain in 24 hours.
What was the windiest day in Jasper?
The windiest day measured in Jasper between 1940 and 2025 was 14 September 2008, with winds reaching 45.0 km/h.
What is the warmest month in Jasper?
The warmest month in Jasper is July (25.3 °C on average); the coldest is January (-0.2 °C).
How much does it rain in Jasper?
Jasper receives on average 1,147 mm of precipitation per year, spread over about 121 rainy days.
Is it sunny in Jasper?
Jasper gets on average 8.9 hours of sunshine per day, roughly 3,249 hours per year over 1940-2025.
What is the biggest single-day snowfall in Jasper?
The heaviest 24-hour snowfall measured in Jasper between 1940 and 2025 was 19 March 1996, with 35.2 cm.
Are there tropical nights in Jasper?
Yes: Jasper has on average 58 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Jasper?
In Jasper, between 1940 and 2025, the highest apparent temperature reached 44.1 °C on 6 July 2012, and the lowest was -36.4 °C on 20 January 1985.
Compare Jasper with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Jasper