Claymont, DE climate
Claymont has chilly winters and warm summers. A typical July afternoon reaches 87°, a January night drops to 25°, and about 12 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Claymont feels like
Winter
Spring
Summer
Fall
Claymont weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 41° | 25° | 3.3" | 5.3" | 10 | 25° – 40° |
| February | 44° | 27° | 2.8" | 4.0" | 9 | 25° – 43° |
| March | 52° | 33° | 4.2" | 1.8" | 11 | 37° – 51° |
| April | 64° | 43° | 3.7" | 0 | 10 | 50° – 59° |
| May | 74° | 52° | 3.5" | 0 | 11 | 58° – 68° |
| June | 82° | 62° | 4.3" | 0 | 10 | 69° – 77° |
| July | 87° | 68° | 4.6" | 0 | 9 | 73° – 81° |
| August | 85° | 66° | 4.4" | 0 | 9 | 71° – 79° |
| September | 78° | 59° | 4.7" | 0 | 9 | 65° – 73° |
| October | 66° | 47° | 3.9" | 0 | 8 | 52° – 63° |
| November | 55° | 37° | 3.3" | 0.1" | 8 | 40° – 52° |
| December | 46° | 30° | 4.0" | 0.8" | 10 | 30° – 50° |
| Year | 64° | 46° | 46.7" | 12.0" | 113 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Claymont
Claymont gets 47 inches of rain and melted snow a year. September is the wettest month and February the driest. Rain or snow falls on about 113 days a year.
About 230 frost-free days a year
In half of years the last 32° night comes by March 30 and the first one by November 16. That leaves about 230 frost-free days for gardens, longer than 86% of U.S. towns.
Heating and cooling a home in Claymont
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Claymont, 75% of that work is heating and 25% is cooling.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
How Claymont compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Claymont averaged 1.8° warmer than the 1900s. The biggest change is in December (+3.3°). The shift is larger than in 89% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Claymont’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. December swings the most: between 1991 and 2020 its average temperature ranged from 30° to 50°. September is the most reliable, staying within 7°.
Common questions about Claymont’s climate
What is the coldest month in Claymont?
January, with a typical high of 41° and a low of 25°.
What is the hottest month in Claymont?
July, with a typical high of 87° and a low of 68°. About 27 days a year reach 90°.
How much snow does Claymont get?
About 12 inches in a normal winter, most of it in January.
When is the first frost in Claymont?
In half of years the first 32° night comes by November 16, and the last spring frost by March 30.
What is the rainiest month in Claymont?
September, with 4.7 inches of rain and melted snow. The year totals 47 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Claymont itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Wilmington Porter Rsch, DE (5 mi, snow) and Marcus Hook, PA (2 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.