Photo: Jerrye & Roy Klotz, MD · CC BY-SA 3.0Delaware gets more rain and snow than 77% of U.S. towns: 48 inches of precipitation a year
Peak summer warmth arrives in July, with afternoons near 84°. Winter nights are cold: in January they are colder than in 66% of U.S. towns. Compared with 1901–2000, the average now sits 2.2° higher. Long walks are most pleasant from May to October, when afternoons reach 64–84°.
A year in Delaware at a glance
Each month’s typical high and low, and what it brings.
What stands out about Delaware’s climate
Compared with towns across the U.S., with Delaware’s place in New Jersey beside it.
What a year in Delaware feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 168 frost-free days a year
In half of years the last 32° night comes by April 30 and the first by October 18. Frost and day counts come from NOAA’s station at Belvidere Brg, NJ, 4 miles from the town’s center, at about the same height.
The 2023 USDA map puts Delaware’s center in zone 7a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 0°. 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 23 inches of snow a winter
Snow, measured at Belvidere Brg, NJ, falls mostly in January. Precipitation (rain plus melted snow) adds up to 48 inches a year; August is the wettest month and February the driest. Rain or snow falls on about 131 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Delaware
90% 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 Belvidere Brg, NJ.
Living with Delaware’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
168 frost-free days in zone 7a. The last frost comes by Apr 30 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 18.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August, September and October.
Parks & trails →Of the yearly building losses FEMA expects in Delaware from natural hazards, river flooding is the largest share (65%); heat waves, cold waves, winter storms and ice storms together are 16%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Delaware and its neighbors
Every town next door is within a degree of Delaware in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Delaware’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 |
|---|---|---|---|---|
| Delaware, NJ | 19° | 84° | 48" | 23" |
| Taunton, MA | 20° | 84° | 50" | 26" |
| Norwich, CT | 19° | 83° | 48" | 28" |
| Connellsville, PA | 21° | 84° | 46" | 24" |
| New Castle, IN | 19° | 84° | 44" | 25" |
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 Delaware averaged 2.2° warmer than the 1900s. The biggest change is in December (+4.0°).
A bigger shift than in 95% 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 Delaware compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Delaware’s place among New Jersey’s.
Delaware weather by month
Highs, lows and precipitation from NOAA’s grid at Delaware’s center; snow, wet days and snow on the ground from Belvidere Brg, NJ. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 37° | 19° | 3.5" | 9.9" | 11 | 18° – 35° |
| February | 40° | 20° | 2.7" | 5.2" | 9 | 18° – 37° |
| March | 49° | 27° | 3.7" | 3.5" | 11 | 32° – 48° |
| April | 62° | 37° | 3.8" | 0.3" | 11 | 45° – 54° |
| May | 72° | 47° | 4.0" | 0.0" | 14 | 54° – 64° |
| June | 79° | 56° | 4.7" | 0.0" | 12 | 64° – 71° |
| July | 84° | 61° | 4.7" | 0.0" | 11 | 67° – 77° |
| August | 82° | 59° | 4.8" | 0.0" | 11 | 66° – 74° |
| September | 75° | 52° | 4.5" | 0.0" | 9 | 61° – 67° |
| October | 64° | 41° | 4.5" | 0.0" | 10 | 47° – 60° |
| November | 52° | 32° | 3.4" | 0.4" | 10 | 37° – 47° |
| December | 41° | 24° | 4.1" | 4.0" | 12 | 25° – 43° |
| Year | 61° | 40° | 48.3" | 23.3" | 131 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 18° to 37°. September is the most reliable, staying within 7°.
Where Delaware’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 Delaware’s center.
- Snow: Belvidere Brg, NJ.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Belvidere Brg, NJ, 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 Delaware’s climate
What is the weather like in Delaware?
A typical July afternoon reaches 84°, a January night drops to 19°, and about 23 inches of snow falls in a normal winter. Colder January nights than 66% of U.S. towns; cooler July afternoons than 61% of U.S. towns.
How cold does it get in Delaware in winter?
January nights average 19°. About 135 nights a year reach 32° or below and 2 reach 0° or below. In the coldest January of the last 30 years the month averaged 18°.
How much snow does Delaware get?
About 23 inches in a normal winter at Belvidere Brg, NJ, most of it in January.
How hot does it get in Delaware?
July, with a typical high of 84° and a low of 61°. About 14 days a year reach 90° (Belvidere Brg, NJ).
When is the first and last frost in Delaware?
In half of years the last spring frost (32°) comes by April 30 and the first fall frost by October 18, about 168 frost-free days, at Belvidere Brg, NJ.
What growing zone is Delaware in?
Zone 7a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 0°.
What is the best time of year to visit Delaware?
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 Delaware getting warmer?
Yes: 1991–2020 averaged 2.2° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 95% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Delaware.
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.