Jacob Broom House · Photo: Template:Jack E. Boucher · Public domainNeither notably warm, cold, wet nor dry, Greenville sits near the middle of U.S. towns
The coldest hours of a January night bottom out at 24° on average. Its yearly precipitation tops that of 71% of U.S. towns. The latest 30-year average runs 1.9° warmer than 1901–2000’s, with December up the most. Garden planting can start around April 7; autumn frost returns near November 4.
A year in Greenville at a glance
Each month’s typical high and low, and what it brings.
What stands out about Greenville’s climate
Compared with towns across the U.S., with Greenville’s place in Delaware beside it.
What a year in Greenville feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 209 frost-free days a year
In half of years the last 32° night comes by April 7 and the first by November 4. Frost and day counts come from NOAA’s station at Wilmington Porter Rsch, DE, 4 miles from the town’s center, at about the same height.
The 2023 USDA map puts Greenville’s center in zone 7b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 6°. 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 20 inches of snow a winter
Snow, measured at Wilmington New Castle Co Airport, falls mostly in February. Precipitation (rain plus melted snow) adds up to 47 inches a year; September is the wettest month and February the driest. Rain or snow falls on about 122 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Greenville
84% of the work is heating. Months averaging under 55° run from November 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 Wilmington Porter Rsch, DE.
Living with Greenville’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
209 frost-free days in zone 7b. The last frost comes by Apr 7 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Nov 4.
Months with highs of 62–84° and lows of 40° or more: April, May, June, September and October. 1.8 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Greenville from natural hazards, river flooding is the largest share (79%); heat waves, cold waves, winter storms and ice storms together are 6%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Greenville and similar climates
TownRatings has no climate map of the towns around Greenville yet.
Climates most like Greenville’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 |
|---|---|---|---|---|
| Greenville, DE | 24° | 87° | 47" | 20" |
| Cynthiana, KY | 24° | 87° | 48" | 16" |
| Amelia, OH | 23° | 86° | 46" | 23" |
| Cave Spring, VA | 27° | 87° | 45" | 18" |
| Lawrenceburg, IN | 23° | 86° | 45" | 23" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Greenville averaged 1.9° warmer than the 1900s. The biggest change is in December (+3.4°).
A bigger shift than in 83% 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 Greenville compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Greenville’s place among Delaware’s.
Greenville weather by month
Highs, lows and precipitation from NOAA’s grid at Greenville’s center; snow, wet days and snow on the ground from Wilmington New Castle Co Airport. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 41° | 24° | 3.4" | 6.1" | 11 | 5 | 24° – 40° |
| February | 44° | 26° | 2.9" | 7.8" | 10 | 7 | 25° – 42° |
| March | 52° | 33° | 4.3" | 3.1" | 11 | 3 | 37° – 51° |
| April | 64° | 42° | 3.7" | 0.1" | 11 | 0 | 50° – 58° |
| May | 74° | 52° | 3.6" | 0.0" | 12 | 0 | 58° – 68° |
| June | 82° | 62° | 4.5" | 0.0" | 11 | 0 | 68° – 76° |
| July | 87° | 67° | 4.6" | 0.0" | 10 | 0 | 73° – 80° |
| August | 85° | 65° | 4.4" | 0.0" | 9 | 0 | 71° – 78° |
| September | 78° | 58° | 4.6" | 0.0" | 9 | 0 | 65° – 72° |
| October | 67° | 46° | 4.0" | 0.0" | 9 | 0 | 52° – 63° |
| November | 55° | 36° | 3.3" | 0.2" | 9 | 0 | 40° – 51° |
| December | 46° | 29° | 4.1" | 2.9" | 11 | 2 | 29° – 49° |
| Year | 64° | 45° | 47.2" | 20.2" | 122 | 17 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 29° to 49°. September is the most reliable, staying within 7°.
Where Greenville’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 Greenville’s center.
- Snow: Wilmington New Castle Co Airport.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Wilmington Porter Rsch, DE, 4 miles from the town’s center, at about the same height; 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 Greenville’s climate
What is the weather like in Greenville?
A typical July afternoon reaches 87°, a January night drops to 24°, and about 20 inches of snow falls in a normal winter. Milder January nights than 61% of U.S. towns; hotter July afternoons than 62% of U.S. towns.
How cold does it get in Greenville in winter?
January nights average 24°. About 87 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 24°.
How much snow does Greenville get?
About 20 inches in a normal winter at Wilmington New Castle Co Airport, most of it in February, with snow on the ground about 17 days a year.
How hot does it get in Greenville?
July, with a typical high of 87° and a low of 67°. About 17 days a year reach 90° (Wilmington Porter Rsch, DE).
When is the first and last frost in Greenville?
In half of years the last spring frost (32°) comes by April 7 and the first fall frost by November 4, about 209 frost-free days, at Wilmington Porter Rsch, DE.
What growing zone is Greenville in?
Zone 7b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 6°.
What is the best time of year to visit Greenville?
By one simple rule (highs of 62–84° and lows of 40° or more), April, May, June, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Greenville getting warmer?
Yes: 1991–2020 averaged 1.9° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 83% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Greenville.
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.