Washington Court House, Ohio climate: Normal weather by month, frost dates and records
Washington Court House's normal year runs from 20°F January nights to 84°F July afternoons, with 40.8 inches of precipitation and 18 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 11.0°C, January lows of −7°C, July highs of 29°C, 1,036 mm of precipitation a year.
- NOAA stationWashington Court House
- Station IDUSC00338794
- Location39.54°N 83.42°W
- Elevation957 ft (292 m)
- From the centerunder 1 mile
- Population14,446
On October 23, the normal high in Washington Court House is 63°F and the normal low 40°F, and the chance of measurable rain or snow is 33%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Washington Court House.
- Jan 36° 20°
- Feb 40° 22°
- Mar 50° 30°
- Apr 64° 40°
- May 73° 51°
- Jun 81° 60°
- Jul 84° 63°
- Aug 82° 61°
- Sep 77° 54°
- Oct 66° 42°
- Nov 52° 32°
- Dec 41° 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 Washington Court House each month?
July is the warmest month, with normal highs of 84°F; January the coldest, with normal lows of 20°F. The most precipitation falls in May (4.45 in), the least in February (2.53 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 36°F | 20°F | 27.8°F | 3.01 | 7.9 | 12 | <1 | 27 | 9 h 40 min |
| February | 40°F | 22°F | 30.9°F | 2.53 | 3.7 | 10 | <1 | 22 | 10 h 40 min |
| March | 50°F | 30°F | 39.9°F | 3.76 | 2.8 | 12 | <1 | 18 | 11 h 50 min |
| April | 64°F | 40°F | 51.6°F | 4.06 | 0.3 | 13 | <1 | 6 | 13 h 10 min |
| May | 73°F | 51°F | 61.8°F | 4.45 | 0.0 | 13 | <1 | <1 | 14 h 20 min |
| June | 81°F | 60°F | 70.1°F | 4.33 | 0.0 | 12 | 2 | <1 | 15 h |
| July | 84°F | 63°F | 73.2°F | 3.95 | 0.0 | 11 | 6 | <1 | 14 h 40 min |
| August | 82°F | 61°F | 71.7°F | 3.35 | 0.0 | 8 | 2 | <1 | 13 h 50 min |
| September | 77°F | 54°F | 65.5°F | 2.69 | 0.0 | 8 | 1 | <1 | 12 h 30 min |
| October | 66°F | 42°F | 54.0°F | 2.69 | 0.2 | 10 | <1 | 3 | 11 h 10 min |
| November | 52°F | 32°F | 41.9°F | 2.78 | 0.7 | 11 | <1 | 16 | 10 h |
| December | 41°F | 25°F | 32.9°F | 3.19 | 2.7 | 11 | <1 | 23 | 9 h 20 min |
| Year (annual) | 62°F | 42°F | 51.8°F | 40.79 | 18.3 | 130 | 12 | 115 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 2°C | −7°C | −2.3°C | 76 mm | 20 cm |
| February | 4°C | −6°C | −0.6°C | 64 mm | 9 cm |
| March | 10°C | −1°C | 4.4°C | 96 mm | 7 cm |
| April | 18°C | 4°C | 10.9°C | 103 mm | 1 cm |
| May | 23°C | 10°C | 16.6°C | 113 mm | 0 cm |
| June | 27°C | 15°C | 21.2°C | 110 mm | 0 cm |
| July | 29°C | 17°C | 22.9°C | 100 mm | 0 cm |
| August | 28°C | 16°C | 22.1°C | 85 mm | 0 cm |
| September | 25°C | 12°C | 18.6°C | 68 mm | 0 cm |
| October | 19°C | 6°C | 12.2°C | 68 mm | 1 cm |
| November | 11°C | 0°C | 5.5°C | 71 mm | 2 cm |
| December | 5°C | −4°C | 0.5°C | 81 mm | 7 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00338794; 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 Washington Court House?
Normal highs sit between 65°F and 85°F in May, June, July, August, September and October. Of those, September has the fewest days with rain (8).
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 USC00338794.
When is the last frost in Washington Court House?
In Washington Court House, the last spring frost (32°F) comes after April 23 in half of years and after May 8 in one year in ten; the first autumn frost comes before October 21 in half of years and before October 8 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 231 year in 10 after May 8; 9 in 10 after April 10
- First autumn frost, half of years before
- October 211 year in 10 before October 8; 9 in 10 before October 31
NOAA puts the median frost-free season at 181 days, and the season without a hard freeze (28°F) at 203 days.
A hard freeze (28°F) comes after April 11 in half of springs and before November 1 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Washington Court House in zone 6b in ZIP code 43160, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Washington Court House's NOAA station is in zone 6b: the coldest night of a typical year reaches −4°F (23 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 USC00338794; 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 Washington Court House?
In a normal year in Washington Court House, 12 days a year reach 90°F, 115 nights fall to 32°F or colder and 130 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
- 115a normal year
- Days that stay below freezing
- 29high of 32°F or less
- Days with 0.01 inch of precipitation
- 130a normal year
- Days with 1 inch of snow or more
- 7a normal year
The highest temperature in this station's record (since 1915) is 107°F, on July 21, 1934; the lowest is −27°F, on January 19, 1994.
The wettest calendar year on that record is 2017, with 54.36 in; the snowiest season is 1977–78, with 59.8 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00338794; records: ACIS (NOAA Regional Climate Centers), station USC00338794. Records use complete months only; a month missing more than three days is left out.
How sunny is Washington Court House?
Over a year 72% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Washington Court House, 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 Washington Court House need?
A normal year in Washington Court House brings 5,615 heating degree days, 5% more than the median U.S. place (5,373), and 830 cooling degree days, 9% 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 3,244 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,153 | 0 |
| February | 955 | 0 |
| March | 779 | 1 |
| April | 406 | 5 |
| May | 164 | 63 |
| June | 22 | 176 |
| July | 3 | 257 |
| August | 7 | 215 |
| September | 83 | 99 |
| October | 354 | 13 |
| November | 695 | 1 |
| December | 995 | 0 |
| Year (annual) | 5,615 | 830 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00338794. 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 Washington Court House been warmer than normal lately?
2025 averaged 52.5°F, 0.7°F above the 1991-2020 normal of 51.8°F. 4 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 53.4°F | +1.6°F | 39.55 | – |
| 2022 | 52.1°F | +0.3°F | 47.44 | – |
| 2024 | 55.1°F | +3.3°F | 36.43 | – |
| 2025 | 52.5°F | +0.7°F | 46.91 | – |
Over 84 complete years from 1916 to 2025, the station's annual mean temperature rose at a fitted 2.3°F per century (+0.13°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00338794; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Washington Court House's climate compare?
Washington Court House is warmer than 55 of the other 98 places with their own NOAA record in Ohio, and wetter than 38. Across the 7,247 U.S. stations with normals, its annual mean of 51.8°F is warmer than 49%.
In the Köppen classification computed from these normals, Washington Court House 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 Washington Court House share this climate record?
10 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.
- Greenfield, OH4,350 people · 13 mi S
- Mount Sterling, OH2,070 people · 15 mi NE
- Jeffersonville, OH1,236 people · 11 mi NW
- Bloomingburg, OH867 people · 5 mi N
- New Holland, OH831 people · 9 mi E
- South Salem, OH209 people · 15 mi SE
- Good Hope, OH199 people · 7 mi SE
- Milledgeville, OH99 people · 10 mi NW
- Octa, OH57 people · 11 mi NW
- Pancoastburg, OH18 people · 10 mi NE
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 Washington Court House's climate
What is the coldest month in Washington Court House?
January, with a normal high of 36°F and a normal low of 20°F. The warmest is July (84°F by day, 63°F at night).
Does it snow in Washington Court House?
Yes: 18 inches in a normal year, falling on 11 days with 0.1 inch or more, the most in January (7.9 inches).
What is the rainiest month in Washington Court House?
May, with 4.45 in of precipitation in a normal year; the driest is February with 2.53 in.
What plant hardiness zone is Washington Court House in?
The USDA's 2023 map puts Washington Court House in zone 6b in ZIP code 43160, the nearest ZIP area. By the same method at Washington Court House's NOAA station, the coldest night of a typical year reaches −4°F (23 years, 1991-2020): zone 6b.
How late can frost come in Washington Court House?
In half of years the last 32°F night comes after April 23; in one year in ten it comes after May 8. Waiting until May 8 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Ohio climateThe statewide normals and every place in the state
- Weather Office Wilmington, OH22 miles from this station, 53.7°F a year
- Wilmington, OH22 miles from this station, 52.6°F a year
- Hillsboro, OH23 miles from this station, 52.3°F a year
- Chillicothe, OH25 miles from this station, 53.5°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made