Marion, Ohio climate: Normal weather by month, frost dates and records
Marion's normal year runs from 19°F January nights to 84°F July afternoons, with 37.5 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.4°C, January lows of −7°C, July highs of 29°C, 954 mm of precipitation a year.
- NOAA stationMarion Municipal Airport
- Station IDUSW00004855
- Location40.62°N 83.06°W
- Elevation994 ft (303 m)
- From the center3 miles
- Population35,576
On October 23, the normal high in Marion is 61°F and the normal low 40°F, and the chance of measurable rain or snow is 37%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Marion.
- Jan 34° 19°
- Feb 37° 21°
- Mar 48° 29°
- Apr 61° 39°
- May 72° 50°
- Jun 80° 60°
- Jul 84° 62°
- Aug 82° 61°
- Sep 76° 53°
- Oct 64° 43°
- Nov 50° 33°
- Dec 39° 25°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Marion each month?
July is the warmest month, with normal highs of 84°F; January the coldest, with normal lows of 19°F. The most precipitation falls in June (4.24 in), the least in February (2.03 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 34°F | 19°F | 26.7°F | 2.39 | 11 | <1 | 27 | 9 h 30 min |
| February | 37°F | 21°F | 29.3°F | 2.03 | 10 | <1 | 25 | 10 h 40 min |
| March | 48°F | 29°F | 38.5°F | 2.62 | 12 | <1 | 21 | 11 h 50 min |
| April | 61°F | 39°F | 50.0°F | 3.88 | 13 | <1 | 7 | 13 h 10 min |
| May | 72°F | 50°F | 61.1°F | 3.98 | 15 | <1 | <1 | 14 h 20 min |
| June | 80°F | 60°F | 69.9°F | 4.24 | 13 | 3 | <1 | 15 h |
| July | 84°F | 62°F | 73.0°F | 3.42 | 12 | 5 | <1 | 14 h 50 min |
| August | 82°F | 61°F | 71.1°F | 3.24 | 12 | 3 | <1 | 13 h 50 min |
| September | 76°F | 53°F | 64.4°F | 3.51 | 11 | 2 | <1 | 12 h 30 min |
| October | 64°F | 43°F | 53.1°F | 2.76 | 12 | <1 | 3 | 11 h 10 min |
| November | 50°F | 33°F | 41.3°F | 2.87 | 10 | <1 | 16 | 10 h |
| December | 39°F | 25°F | 31.7°F | 2.61 | 11 | <1 | 24 | 9 h 20 min |
| Year (annual) | 61°F | 41°F | 50.8°F | 37.55 | 141 | 12 | 123 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 1°C | −7°C | −2.9°C | 61 mm |
| February | 3°C | −6°C | −1.5°C | 52 mm |
| March | 9°C | −2°C | 3.6°C | 67 mm |
| April | 16°C | 4°C | 10.0°C | 99 mm |
| May | 22°C | 10°C | 16.2°C | 101 mm |
| June | 27°C | 15°C | 21.1°C | 108 mm |
| July | 29°C | 17°C | 22.8°C | 87 mm |
| August | 28°C | 16°C | 21.7°C | 82 mm |
| September | 24°C | 12°C | 18.0°C | 89 mm |
| October | 18°C | 6°C | 11.7°C | 70 mm |
| November | 10°C | 0°C | 5.2°C | 73 mm |
| December | 4°C | −4°C | −0.2°C | 66 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. Marion's own co-op station Marion (2 mi N) does: 24 inches of snow in a normal year (see the other stations below).
Source: NOAA NCEI 1991-2020 monthly normals, station USW00004855; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Marion?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, September has the fewest days with rain (11).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00004855.
When is the last frost in Marion?
In Marion, the last spring frost (32°F) comes after April 24 in half of years and after May 10 in one year in ten; the first autumn frost comes before October 20 in half of years and before October 5 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- April 241 year in 10 after May 10; 9 in 10 after April 11
- First autumn frost, half of years before
- October 201 year in 10 before October 5; 9 in 10 before November 1
NOAA puts the median frost-free season at 178 days, and the season without a hard freeze (28°F) at 201 days.
A hard freeze (28°F) comes after April 15 in half of springs and before October 31 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Marion in zone 6a in ZIP code 43302, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Marion's NOAA station is in zone 6a: the coldest night of a typical year reaches −7°F (20 complete years).
Frost dates for every NOAA station in Ohio · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USW00004855; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in Marion?
In a normal year in Marion, 12 days a year reach 90°F, 123 nights fall to 32°F or colder and 141 days bring measurable precipitation.
- Days at 90°F or more
- 12a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 123a normal year
- Days that stay below freezing
- 40high of 32°F or less
- Days with 0.01 inch of precipitation
- 141a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USW00004855.
How sunny is Marion?
Over a year 72% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Marion, 3.9 kWh per square metre a day. August is the sunniest month (81%) and December the cloudiest (56%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 57% | 1.7 |
| February | 63% | 2.6 |
| March | 63% | 3.5 |
| April | 69% | 4.8 |
| May | 72% | 5.5 |
| June | 77% | 6.2 |
| July | 80% | 6.2 |
| August | 81% | 5.6 |
| September | 78% | 4.5 |
| October | 70% | 3.0 |
| November | 67% | 2.1 |
| December | 56% | 1.4 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Marion need?
A normal year in Marion brings 5,901 heating degree days, 10% more than the median U.S. place (5,373), and 779 cooling degree days, 14% fewer than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 3,109 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,189 | 0 |
| February | 1,000 | 0 |
| March | 822 | 1 |
| April | 454 | 6 |
| May | 177 | 56 |
| June | 28 | 173 |
| July | 4 | 252 |
| August | 8 | 199 |
| September | 97 | 80 |
| October | 382 | 13 |
| November | 711 | 0 |
| December | 1,031 | 0 |
| Year (annual) | 5,901 | 779 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00004855. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Has Marion been warmer than normal lately?
2023 averaged 53.4°F, 2.6°F above the 1991-2020 normal of 50.8°F.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2023 | 53.4°F | +2.6°F | 31.49 |
Source: observed years: ACIS, station USW00004855. A year counts only with all twelve months complete.
How does Marion's climate compare?
Marion is warmer than 32 of the other 98 places with their own NOAA record in Ohio, and wetter than 14. Across the 7,247 U.S. stations with normals, its annual mean of 50.8°F is warmer than 44%.
In the Köppen classification computed from these normals, Marion is Dfa: continental, no dry season, hot summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Marion share this climate record?
9 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Cardington, OH2,203 people · 12 mi SE
- Ashley, OH1,350 people · 15 mi S
- Prospect, OH1,057 people · 13 mi SW
- Caledonia, OH558 people · 5 mi E
- Edison, OH443 people · 11 mi E
- New Bloomington, OH414 people · 13 mi W
- Morral, OH369 people · 9 mi NW
- Waldo, OH317 people · 11 mi S
- Green Camp, OH305 people · 10 mi SW
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
What do Marion's other NOAA stations record?
One more NOAA station keeps 1991-2020 normals in or near Marion. This page uses Marion Municipal Airport; the other differs by site and elevation:
| Station | From the center | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Marion (2 mi N) USC00334942 | 1 mi N | 965 ft | 50.6°F | 18°F | 84°F | 39.4 | 24 | April 25 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Marion's climate
What is the coldest month in Marion?
January, with a normal high of 34°F and a normal low of 19°F. The warmest is July (84°F by day, 62°F at night).
Does it snow in Marion?
Yes. NOAA publishes no 1991-2020 snowfall normal for Marion's NOAA station; Marion's own co-op station Marion (2 mi N) records 24 inches of snow in a normal year.
What is the rainiest month in Marion?
June, with 4.24 in of precipitation in a normal year; the driest is February with 2.03 in.
What plant hardiness zone is Marion in?
The USDA's 2023 map puts Marion in zone 6a in ZIP code 43302, the nearest ZIP area. By the same method at Marion's NOAA station, the coldest night of a typical year reaches −7°F (20 years, 1991-2020): zone 6a.
How late can frost come in Marion?
In half of years the last 32°F night comes after April 24; in one year in ten it comes after May 10. Waiting until May 10 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Ohio climateThe statewide normals and every place in the state
- Bucyrus, OH14 miles from this station, 52.3°F a year
- Galion, OH16 miles from this station, 50.1°F a year
- Upper Sandusky, OH19 miles from this station, 50.1°F a year
- Kenton, OH29 miles from this station, 50.8°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made