Chillicothe, Ohio climate: Normal weather by month, frost dates and records
Chillicothe's normal year runs from 21°F January nights to 85°F July afternoons. (NOAA 1991-2020 normals)
In metric: a yearly mean of 11.9°C, January lows of −6°C, July highs of 29°C.
- NOAA stationChillicothe Mound City
- Station IDUSC00331528
- Location39.37°N 83.00°W
- Elevation650 ft (198 m)
- Population21,769
On October 14, the normal high in Chillicothe is 68°F and the normal low 44°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Chillicothe.
- Jan 39° 21°
- Feb 43° 24°
- Mar 53° 31°
- Apr 66° 41°
- May 74° 52°
- Jun 83° 61°
- Jul 85° 64°
- Aug 85° 62°
- Sep 79° 54°
- Oct 67° 43°
- Nov 55° 34°
- Dec 44° 26°
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 Chillicothe each month?
July is the warmest month, with normal highs of 85°F; January the coldest, with normal lows of 21°F.
| Month | High | Low | Mean | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|
| January | 39°F | 21°F | 30.1°F | – | <1 | 25 | 9 h 40 min |
| February | 43°F | 24°F | 33.4°F | – | <1 | 23 | 10 h 40 min |
| March | 53°F | 31°F | 42.2°F | – | <1 | 18 | 11 h 50 min |
| April | 66°F | 41°F | 53.4°F | – | <1 | 6 | 13 h 10 min |
| May | 74°F | 52°F | 62.7°F | – | <1 | <1 | 14 h 20 min |
| June | 83°F | 61°F | 71.8°F | – | 6 | <1 | 15 h |
| July | 85°F | 64°F | 74.5°F | – | 7 | <1 | 14 h 40 min |
| August | 85°F | 62°F | 73.2°F | – | 6 | <1 | 13 h 50 min |
| September | 79°F | 54°F | 66.2°F | – | 3 | <1 | 12 h 30 min |
| October | 67°F | 43°F | 55.3°F | – | <1 | 4 | 11 h 10 min |
| November | 55°F | 34°F | 44.2°F | – | <1 | 14 | 10 h |
| December | 44°F | 26°F | 35.0°F | – | <1 | 23 | 9 h 30 min |
| Year (annual) | 64°F | 43°F | 53.5°F | – | 22 | 114 |
The same normals in °C and millimetres
| Month | High | Low | Mean |
|---|---|---|---|
| January | 4°C | −6°C | −1.1°C |
| February | 6°C | −5°C | 0.8°C |
| March | 12°C | −1°C | 5.7°C |
| April | 19°C | 5°C | 11.9°C |
| May | 23°C | 11°C | 17.1°C |
| June | 28°C | 16°C | 22.1°C |
| July | 29°C | 18°C | 23.6°C |
| August | 29°C | 17°C | 22.9°C |
| September | 26°C | 12°C | 19.0°C |
| October | 20°C | 6°C | 12.9°C |
| November | 13°C | 1°C | 6.8°C |
| December | 7°C | −3°C | 1.7°C |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Circleville (16 miles away), gets 15 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00331528; 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 Chillicothe?
Normal highs sit between 65°F and 85°F in April, May, June, July, August, September and October.
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 USC00331528.
When is the last frost in Chillicothe?
In Chillicothe, the last spring frost (32°F) comes after April 20 in half of years and after May 7 in one year in ten; the first autumn frost comes before October 22 in half of years and before October 7 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 201 year in 10 after May 7; 9 in 10 after April 6
- First autumn frost, half of years before
- October 221 year in 10 before October 7; 9 in 10 before November 4
NOAA puts the median frost-free season at 184 days, and the season without a hard freeze (28°F) at 207 days.
A hard freeze (28°F) comes after April 6 in half of springs and before November 2 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Chillicothe in zone 6b in ZIP code 45601, the nearest ZIP area.
Frost dates for every NOAA station in Ohio · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00331528; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. 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 Chillicothe?
In a normal year in Chillicothe, 22 days a year reach 90°F and 114 nights fall to 32°F or colder.
- Days at 90°F or more
- 22a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 114a normal year
- Days that stay below freezing
- 20high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00331528.
How sunny is Chillicothe?
Over a year 72% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Chillicothe, 4.0 kWh per square metre a day. August is the sunniest month (81%) and December the cloudiest (57%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 58% | 1.8 |
| February | 62% | 2.6 |
| March | 65% | 3.6 |
| April | 71% | 4.9 |
| May | 73% | 5.6 |
| June | 78% | 6.2 |
| July | 79% | 6.0 |
| August | 81% | 5.5 |
| September | 79% | 4.6 |
| October | 72% | 3.2 |
| November | 69% | 2.2 |
| December | 57% | 1.5 |
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 Chillicothe need?
A normal year in Chillicothe brings 5,145 heating degree days, 4% fewer than the median U.S. place (5,373), and 986 cooling degree days, 9% more 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 3,538 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,080 | 0 |
| February | 886 | 0 |
| March | 708 | 1 |
| April | 362 | 14 |
| May | 142 | 70 |
| June | 17 | 221 |
| July | 1 | 297 |
| August | 4 | 258 |
| September | 70 | 106 |
| October | 318 | 18 |
| November | 626 | 1 |
| December | 930 | 0 |
| Year (annual) | 5,145 | 986 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00331528. 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.
How does Chillicothe's climate compare?
Chillicothe is warmer than 80 of the other 98 places with their own NOAA record in Ohio. Across the 7,247 U.S. stations with normals, its annual mean of 53.5°F is warmer than 55%.
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers.
Which places near Chillicothe share this climate record?
6 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.
- Kingston, OH1,236 people · 8 mi NE
- Frankfort, OH1,097 people · 10 mi W
- Bourneville, OH471 people · 10 mi SW
- Andersonville, OH437 people · 4 mi N
- Massieville, OH415 people · 8 mi S
- Clarksburg, OH400 people · 12 mi NW
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Chillicothe's climate
What is the coldest month in Chillicothe?
January, with a normal high of 39°F and a normal low of 21°F. The warmest is July (85°F by day, 64°F at night).
Does it snow in Chillicothe?
Yes. NOAA publishes no 1991-2020 snowfall normal for Chillicothe's NOAA station; the nearest record that keeps one, Circleville (16 miles away), records 15 inches of snow in a normal year.
What plant hardiness zone is Chillicothe in?
The USDA's 2023 map puts Chillicothe in zone 6b in ZIP code 45601, the nearest ZIP area.
How late can frost come in Chillicothe?
In half of years the last 32°F night comes after April 20; in one year in ten it comes after May 7. Waiting until May 7 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Ohio climateThe statewide normals and every place in the state
- Circleville, OH17 miles from this station, 54.3°F a year
- Waverly, OH18 miles from this station, 53.9°F a year
- Washington Court House, OH25 miles from this station, 51.8°F a year
- Jackson, OH26 miles from this station, 51.5°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made