Photo: Aesopposea · CC BY-SA 3.0The climate in Adelphi sits close to the middle of U.S. towns
Expect July afternoons of about 85°. Warming shows here too: 1.0° more than in 1901–2000, led by December. Garden planting can start around April 17; autumn frost returns near October 28.
A year in Adelphi at a glance
Each month’s typical high and low, and what it brings.
What stands out about Adelphi’s climate
Compared with towns across the U.S., with Adelphi’s place in Ohio beside it.
What a year in Adelphi feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 192 frost-free days a year
In half of years the last 32° night comes by April 17 and the first by October 28. Frost and day counts come from NOAA’s station at Circleville, OH, 15 miles from the town’s center, 170 ft lower.
The 2023 USDA map puts Adelphi’s center in zone 6b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −3°. 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 15 inches of snow a winter
Snow, measured at Laurelville, OH, falls mostly in January. Precipitation (rain plus melted snow) adds up to 42 inches a year; May is the wettest month and February the driest. Rain or snow falls on about 118 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Adelphi
82% of the work is heating. 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 Circleville, OH.
Living with Adelphi’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
192 frost-free days in zone 6b. The last frost comes by Apr 17 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 28.
Months with highs of 62–84° and lows of 40° or more: April, May, June, August, September and October.
Parks & trails →Of the yearly building losses FEMA expects in Adelphi from natural hazards, river flooding is the largest share (59%); heat waves, cold waves, winter storms and ice storms together are 12%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Adelphi and its neighbors
Every town next door is within a degree of Adelphi in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Adelphi’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Adelphi, OH | 22° | 85° | 42" | 15" |
| Shelbyville, IN | 21° | 85° | 44" | 15" |
| Pulaski, VA | 24° | 84° | 41" | 16" |
| Mattoon, IL | 20° | 86° | 41" | 15" |
| Clairton, PA | 22° | 84° | 41" | 21" |
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 Adelphi averaged 1.0° warmer than the 1900s. The biggest change is in December (+2.5°).
A smaller shift than in 78% 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 Adelphi compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Adelphi’s place among Ohio’s.
Adelphi weather by month
Highs, lows and precipitation from NOAA’s grid at Adelphi’s center; snow, wet days and snow on the ground from Laurelville, OH. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 38° | 22° | 3.1" | 6.8" | 11 | 21° – 41° |
| February | 42° | 24° | 2.7" | 4.2" | 9 | 19° – 42° |
| March | 52° | 32° | 3.5" | 1.4" | 10 | 35° – 54° |
| April | 65° | 41° | 4.1" | 0.0" | 11 | 47° – 59° |
| May | 74° | 51° | 4.5" | 0.0" | 12 | 56° – 71° |
| June | 82° | 60° | 4.4" | 0.0" | 11 | 66° – 73° |
| July | 85° | 63° | 4.2" | 0.0" | 10 | 69° – 79° |
| August | 84° | 62° | 3.5" | 0.0" | 9 | 68° – 77° |
| September | 78° | 54° | 3.1" | 0.0" | 8 | 63° – 72° |
| October | 66° | 43° | 3.0" | 0.0" | 9 | 51° – 61° |
| November | 53° | 33° | 3.1" | 0.1" | 8 | 37° – 48° |
| December | 42° | 27° | 3.1" | 2.8" | 10 | 24° – 46° |
| Year | 63° | 43° | 42.2" | 15.3" | 118 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 19° to 42°. June is the most reliable, staying within 8°.
Where Adelphi’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 Adelphi’s center.
- Snow: Laurelville, OH (NOAA station in town).
- Frost, freezing nights, 90° and 100° days, heating and cooling: Circleville, OH, 15 miles from the town’s center, 170 ft lower; 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 Adelphi’s climate
What is the weather like in Adelphi?
A typical July afternoon reaches 85°, a January night drops to 22°, and about 15 inches of snow falls in a normal winter. Milder January nights than 52% of U.S. towns; cooler July afternoons than 52% of U.S. towns.
How cold does it get in Adelphi in winter?
January nights average 22°. About 110 nights a year reach 32° or below and 4 reach 0° or below. In the coldest January of the last 30 years the month averaged 21°.
How much snow does Adelphi get?
About 15 inches in a normal winter at Laurelville, OH, most of it in January.
How hot does it get in Adelphi?
July, with a typical high of 85° and a low of 63°. About 19 days a year reach 90° (Circleville, OH).
When is the first and last frost in Adelphi?
In half of years the last spring frost (32°) comes by April 17 and the first fall frost by October 28, about 192 frost-free days, at Circleville, OH.
What growing zone is Adelphi in?
Zone 6b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −3°.
What is the best time of year to visit Adelphi?
By one simple rule (highs of 62–84° and lows of 40° or more), April, May, June, August, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Adelphi getting warmer?
Yes: 1991–2020 averaged 1.0° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 78% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Adelphi.
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.