Summer arrives in force in Delaware, hotter than in 86% of U.S. towns
In January the night’s low is typically 26°. Temperatures cover 66° across the year, low to high. Winters are mild: January nights here are milder than in 64% of U.S. towns. Garden planting can start around April 4; autumn frost returns near November 1.
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 Oklahoma 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 210 frost-free days a year
In half of years the last 32° night comes by April 4 and the first by November 1. Frost and day counts come from NOAA’s station at Nowata, OK, 6 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 2°. 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 8 inches of snow a winter
Snow, measured at Coffeyville Wtr Wks, KS, falls mostly in December. Precipitation (rain plus melted snow) adds up to 42 inches a year; May is the wettest month and January the driest. Rain or snow falls on about 88 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Delaware
66% of the work is heating. Months averaging under 55° run from November through March.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Nowata, OK.
Living with Delaware’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
210 frost-free days in zone 7a. The last frost comes by Apr 4 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 1.
Months with highs of 62–84° and lows of 40° or more: April, May, September and October.
Parks & trails →Of the yearly building losses FEMA expects in Delaware from natural hazards, river flooding is the largest share (31%); heat waves, cold waves, winter storms and ice storms together are 26%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Delaware and similar climates
TownRatings has no climate map of the towns around Delaware yet.
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, OK | 26° | 92° | 42" | 8.3" |
| Pevely, MO | 23° | 89° | 43" | 9.2" |
| Columbia, IL | 24° | 89° | 42" | 8.8" |
| East Highland Park, VA | 28° | 90° | 46" | 8.8" |
| Mountain Home, AR | 26° | 90° | 48" | 7.8" |
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 Delaware averaged 0.5° warmer than the 1900s. The biggest change is in March (+2.0°).
A smaller shift than in 98% 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 Oklahoma’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 Coffeyville Wtr Wks, KS. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 47° | 26° | 1.5" | 1.8" | 5 | 3 | 31° – 46° |
| February | 52° | 29° | 1.8" | 1.4" | 6 | 1 | 34° – 49° |
| March | 61° | 39° | 3.0" | 1.3" | 8 | 1 | 43° – 60° |
| April | 71° | 47° | 4.4" | 0.0" | 9 | 0 | 52° – 66° |
| May | 78° | 57° | 6.3" | 0.0" | 11 | 0 | 64° – 74° |
| June | 87° | 67° | 5.3" | 0.0" | 9 | 0 | 72° – 82° |
| July | 92° | 71° | 3.6" | 0.0" | 7 | 0 | 76° – 88° |
| August | 91° | 69° | 3.7" | 0.0" | 7 | 0 | 74° – 85° |
| September | 83° | 60° | 4.0" | 0.0" | 6 | 0 | 67° – 79° |
| October | 72° | 48° | 3.7" | 0.0" | 8 | 0 | 54° – 66° |
| November | 60° | 37° | 2.6" | 0.6" | 5 | 0 | 42° – 57° |
| December | 49° | 28° | 2.1" | 3.2" | 6 | 4 | 26° – 44° |
| Year | 70° | 48° | 41.9" | 8.3" | 88 | 9 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 26° to 44°. June is the most reliable, staying within 9°.
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: Coffeyville Wtr Wks, KS.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Nowata, OK, 6 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 92°, a January night drops to 26°, and about 8 inches of snow falls in a normal winter. Milder January nights than 64% of U.S. towns; hotter July afternoons than 86% of U.S. towns.
How cold does it get in Delaware in winter?
January nights average 26°. About 82 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 31°.
How much snow does Delaware get?
About 8.3 inches in a normal winter at Coffeyville Wtr Wks, KS, most of it in December, with snow on the ground about 9 days a year.
How hot does it get in Delaware?
July, with a typical high of 92° and a low of 71°. About 60 days a year reach 90° and 9 reach 100° (Nowata, OK).
When is the first and last frost in Delaware?
In half of years the last spring frost (32°) comes by April 4 and the first fall frost by November 1, about 210 frost-free days, at Nowata, OK.
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 2°.
What is the best time of year to visit Delaware?
By one simple rule (highs of 62–84° and lows of 40° or more), April, May, 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 0.5° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 98% 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.