Photo: Nyttend · Public domainNeither notably warm, cold, wet nor dry, De Graff sits near the middle of U.S. towns
The warmest part of a July day comes in at 84° on average. Only 64° separates winter nights from summer afternoons. Its January nights bite harder than in 62% of U.S. towns. Comfortable outdoor weather lasts from May to October, with highs of 64–84°.
A year in De Graff at a glance
Each month’s typical high and low, and what it brings.
What stands out about De Graff’s climate
Compared with towns across the U.S., with De Graff’s place in Ohio beside it.
What a year in De Graff feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 175 frost-free days a year
In half of years the last 32° night comes by April 26 and the first by October 20. Frost and day counts come from NOAA’s station at Bellefontaine, OH, 8 miles from the town’s center, 180 ft higher.
The 2023 USDA map puts De Graff’s center in zone 6a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −7°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 42 inches of rain a year
July is the wettest month and February the driest.
Rain + melted snow by month
Inches of water
Heating and cooling a home in De Graff
88% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Bellefontaine, OH.
Living with De Graff’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
175 frost-free days in zone 6a. The last frost comes by Apr 26 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 20.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August, September and October. 0.0 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in De Graff from natural hazards, river flooding is the largest share (71%); heat waves, cold waves, winter storms and ice storms together are 7%. Normals are averages; the hazards page covers the extremes.
Natural hazards →De Graff and its neighbors
Every town next door is within a degree of De Graff in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in De Graff averaged 1.2° warmer than the 1900s. The biggest change is in December (+2.5°).
A smaller shift than in 61% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How De Graff compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with De Graff’s place among Ohio’s.
De Graff weather by month
Highs, lows and precipitation from NOAA’s grid at De Graff’s center. 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 34° | 20° | 3.0" | 18° – 38° |
| February | 38° | 22° | 2.3" | 17° – 40° |
| March | 49° | 30° | 3.1" | 33° – 52° |
| April | 62° | 40° | 4.1" | 44° – 56° |
| May | 73° | 50° | 4.4" | 55° – 68° |
| June | 81° | 60° | 4.5" | 65° – 73° |
| July | 84° | 63° | 4.6" | 69° – 78° |
| August | 82° | 61° | 3.5" | 68° – 76° |
| September | 77° | 54° | 3.2" | 62° – 70° |
| October | 64° | 43° | 2.9" | 49° – 60° |
| November | 50° | 33° | 3.1" | 35° – 48° |
| December | 39° | 25° | 2.9" | 20° – 42° |
| Year | 61° | 42° | 41.7" |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 17° to 40°. September is the most reliable, staying within 8°.
Where De Graff’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at De Graff’s center.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Bellefontaine, OH, 8 miles from the town’s center, 180 ft higher; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about De Graff’s climate
What is the weather like in De Graff?
A typical July afternoon reaches 84°, a January night drops to 20°. Colder January nights than 62% of U.S. towns; cooler July afternoons than 61% of U.S. towns.
How cold does it get in De Graff in winter?
January nights average 20°. About 127 nights a year reach 32° or below and 7 reach 0° or below. In the coldest January of the last 30 years the month averaged 18°.
How hot does it get in De Graff?
July, with a typical high of 84° and a low of 63°. About 8 days a year reach 90° (Bellefontaine, OH).
When is the first and last frost in De Graff?
In half of years the last spring frost (32°) comes by April 26 and the first fall frost by October 20, about 175 frost-free days, at Bellefontaine, OH.
What growing zone is De Graff in?
Zone 6a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −7°.
What is the best time of year to visit De Graff?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is De Graff getting warmer?
Yes: 1991–2020 averaged 1.2° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 61% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in De Graff.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.