Seymour climate — normals and trends
Seymour (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 12.5 °C and it receives 1,080 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 (24.6 °C on average) and the coldest is January (-0.8 °C). Rainfall peaks in April.
Seymour averages 89 frost days, 45 hot days (≥ 30 °C) and 122 rainy days per year.
Seymour has warmed by +1.7 °C between 1940 and 2025, or +0.20 °C per decade. This trend is statistically significant.
The number of frost days there went from about 101 to 77 per year over the period.
The hottest day of the period reached 40.4 °C (on 22 July 1983) and the coldest -30.5 °C (on 17 January 1982).
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
SeymourIndiana
- coords
- 38.96°, -85.89°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
12.5°C
Average daily high
17.6°C
Average daily low
7.9°C
Annual rainfall
1,080mm
Sunshine / day
8.7h
Mean relative humidity
70%
Average peak wind
15.6km/h
Seasonal range
25.4°C
Frost days (< 0 °C)
89 d/yr
Hot days (≥ 30 °C)
45 d/yr
Rainy days (≥ 1 mm)
122 d/yr
Annual snowfall
41.2 cm
Average feels-like high
16.5 °C
Average feels-like low
5.8 °C
Average peak gust
36.1 km/h
Tropical nights (≥ 20 °C)
46 d/yr
Solar radiation
15.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.7 °C
since 1940
+0.2 °C per decade · r² = 0.34 · 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
40.4 °C
22 July 1983
Coldest day
-30.5 °C
17 January 1982
Wettest day
159 mm
1 October 1977
Windiest day
42.6 km/h
2 April 2016
Strongest gust
109.4 km/h
10 November 1998
Hottest feels-like
44.2 °C
29 June 2012
Coldest feels-like
-37.1 °C
20 January 1985
Snowiest day
29.1 cm
19 March 1996
Sunniest day
14.4 h
11 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 | 1.0 °C | -2.4 °C | 66 mm | -15 mm |
| Feb | 6.0 °C | +0.1 °C | 129 mm | +49 mm |
| Mar | 16.2 °C | +4.7 °C | 119 mm | +11 mm |
| Apr | 19.4 °C | +1.4 °C | 190 mm | +76 mm |
| May | 22.1 °C | -1.1 °C | 123 mm | +9 mm |
| Jun | 29.1 °C | +1.1 °C | 124 mm | +27 mm |
| Jul | 31.0 °C | +1.2 °C | 214 mm | +124 mm |
| Aug | 28.3 °C | -0.8 °C | 34 mm | -45 mm |
| Sep | 27.6 °C | +2.0 °C | 79 mm | +6 mm |
| Oct | 20.4 °C | +1.1 °C | 84 mm | +13 mm |
| Nov | 12.0 °C | +0.4 °C | 77 mm | -12 mm |
| Dec | 5.8 °C | +0.2 °C | 59 mm | -26 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 Seymour?
Seymour has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 12.5 °C and it receives 1,080 mm of precipitation per year.
What is the hottest day ever recorded in Seymour?
The hottest day measured in Seymour between 1940 and 2025 was 22 July 1983, reaching 40.4 °C.
What is the coldest day in Seymour?
The coldest day measured in Seymour between 1940 and 2025 was 17 January 1982, at -30.5 °C.
Does it snow in Seymour?
Yes. Seymour gets on average 41.2 cm of snow per year and has around 89 frost days.
Has the climate of Seymour warmed?
Yes: Seymour warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Seymour?
The wettest day measured in Seymour between 1940 and 2025 was 1 October 1977, with 159 mm of rain in 24 hours.
What was the windiest day in Seymour?
The windiest day measured in Seymour between 1940 and 2025 was 2 April 2016, with winds reaching 42.6 km/h.
What is the warmest month in Seymour?
The warmest month in Seymour is July (24.6 °C on average); the coldest is January (-0.8 °C).
How much does it rain in Seymour?
Seymour receives on average 1,080 mm of precipitation per year, spread over about 122 rainy days.
Is it sunny in Seymour?
Seymour gets on average 8.7 hours of sunshine per day, roughly 3,175 hours per year over 1940-2025.
What is the biggest single-day snowfall in Seymour?
The heaviest 24-hour snowfall measured in Seymour between 1940 and 2025 was 19 March 1996, with 29.1 cm.
Are there tropical nights in Seymour?
Yes: Seymour has on average 46 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Seymour?
In Seymour, between 1940 and 2025, the highest apparent temperature reached 44.2 °C on 29 June 2012, and the lowest was -37.1 °C on 20 January 1985.
Compare Seymour with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Seymour