Marion climate — normals and trends
Marion (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 10.6 °C and it receives 1,004 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 (22.9 °C on average) and the coldest is January (-2.9 °C). Rainfall peaks in May.
Marion averages 110 frost days, 22 hot days (≥ 30 °C) and 130 rainy days per year.
Marion has warmed by +1.8 °C between 1940 and 2025, or +0.21 °C per decade. This trend is statistically significant.
The number of frost days there went from about 122 to 98 per year over the period.
The hottest day of the period reached 38.8 °C (on 25 June 1988) and the coldest -30.7 °C (on 19 January 1994).
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
MarionOhio
- coords
- 40.59°, -83.13°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.6°C
Average daily high
15.5°C
Average daily low
5.9°C
Annual rainfall
1,004mm
Sunshine / day
8.6h
Mean relative humidity
71%
Average peak wind
20.0km/h
Seasonal range
25.8°C
Frost days (< 0 °C)
110 d/yr
Hot days (≥ 30 °C)
22 d/yr
Rainy days (≥ 1 mm)
130 d/yr
Annual snowfall
65.0 cm
Average feels-like high
13.5 °C
Average feels-like low
3.0 °C
Average peak gust
38.5 km/h
Tropical nights (≥ 20 °C)
24 d/yr
Solar radiation
14.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.36 · 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
38.8 °C
25 June 1988
Coldest day
-30.7 °C
19 January 1994
Wettest day
77 mm
21 January 1959
Windiest day
57.7 km/h
22 March 1960
Strongest gust
109.8 km/h
9 January 2008
Hottest feels-like
41.8 °C
22 July 2011
Coldest feels-like
-37.6 °C
20 January 1985
Snowiest day
22.1 cm
22 March 1968
Sunniest day
14.9 h
18 June 1941
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 | -1.3 °C | -2.3 °C | 38 mm | -36 mm |
| Feb | 2.7 °C | -0.2 °C | 90 mm | +23 mm |
| Mar | 14.0 °C | +5.2 °C | 83 mm | -12 mm |
| Apr | 17.4 °C | +1.7 °C | 145 mm | +42 mm |
| May | 19.8 °C | -1.6 °C | 162 mm | +57 mm |
| Jun | 27.3 °C | +1.3 °C | 136 mm | +38 mm |
| Jul | 28.7 °C | +0.9 °C | 120 mm | +31 mm |
| Aug | 26.1 °C | -1.0 °C | 24 mm | -54 mm |
| Sep | 26.2 °C | +2.3 °C | 54 mm | -14 mm |
| Oct | 18.8 °C | +1.3 °C | 90 mm | +23 mm |
| Nov | 9.7 °C | -0.2 °C | 46 mm | -35 mm |
| Dec | 3.5 °C | 0.0 °C | 59 mm | -19 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 Marion?
Marion has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 10.6 °C and it receives 1,004 mm of precipitation per year.
What is the hottest day ever recorded in Marion?
The hottest day measured in Marion between 1940 and 2025 was 25 June 1988, reaching 38.8 °C.
What is the coldest day in Marion?
The coldest day measured in Marion between 1940 and 2025 was 19 January 1994, at -30.7 °C.
Does it snow in Marion?
Yes. Marion gets on average 65.0 cm of snow per year and has around 110 frost days.
Has the climate of Marion warmed?
Yes: Marion warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Marion?
The wettest day measured in Marion between 1940 and 2025 was 21 January 1959, with 77 mm of rain in 24 hours.
What was the windiest day in Marion?
The windiest day measured in Marion between 1940 and 2025 was 22 March 1960, with winds reaching 57.7 km/h.
What is the warmest month in Marion?
The warmest month in Marion is July (22.9 °C on average); the coldest is January (-2.9 °C).
How much does it rain in Marion?
Marion receives on average 1,004 mm of precipitation per year, spread over about 130 rainy days.
Is it sunny in Marion?
Marion gets on average 8.6 hours of sunshine per day, roughly 3,139 hours per year over 1940-2025.
What is the biggest single-day snowfall in Marion?
The heaviest 24-hour snowfall measured in Marion between 1940 and 2025 was 22 March 1968, with 22.1 cm.
Are there tropical nights in Marion?
Yes: Marion has on average 24 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Marion?
In Marion, between 1940 and 2025, the highest apparent temperature reached 41.8 °C on 22 July 2011, and the lowest was -37.6 °C on 20 January 1985.
Compare Marion with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Marion