Deal Island, MD climate
Deal Island has mild winters and warm summers. A typical July afternoon reaches 88°, a January night drops to 29°.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Deal Island feels like
Winter
Spring
Summer
Fall
Deal Island weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 46° | 29° | 3.3" | 31° – 44° |
| February | 48° | 30° | 2.8" | 28° – 46° |
| March | 55° | 37° | 4.0" | 41° – 55° |
| April | 66° | 46° | 3.4" | 52° – 62° |
| May | 75° | 56° | 3.6" | 60° – 71° |
| June | 83° | 65° | 4.1" | 69° – 79° |
| July | 88° | 71° | 4.5" | 75° – 83° |
| August | 86° | 69° | 4.6" | 74° – 81° |
| September | 80° | 63° | 4.1" | 68° – 77° |
| October | 70° | 51° | 4.0" | 56° – 67° |
| November | 59° | 40° | 3.1" | 44° – 54° |
| December | 50° | 33° | 3.6" | 33° – 52° |
| Year | 67° | 49° | 45.1" |
“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 Deal Island
Deal Island gets 45 inches of rain and melted snow a year. August is the wettest month and February the driest.
About 217 frost-free days a year
In half of years the last 32° night comes by April 3 and the first one by November 7. That leaves about 217 frost-free days for gardens, longer than 81% of U.S. towns.
Heating and cooling a home in Deal Island
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Deal Island, 72% of that work is heating and 28% 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 Deal Island 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 Deal Island averaged 1.7° warmer than the 1900s. The biggest change is in December (+2.7°). The shift is larger than in 84% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Deal Island’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 33° to 52°. August is the most reliable, staying within 7°.
Common questions about Deal Island’s climate
What is the coldest month in Deal Island?
January, with a typical high of 46° and a low of 29°.
What is the hottest month in Deal Island?
July, with a typical high of 88° and a low of 71°. About 31 days a year reach 90°.
When is the first frost in Deal Island?
In half of years the first 32° night comes by November 7, and the last spring frost by April 3.
What is the rainiest month in Deal Island?
August, with 4.6 inches of rain and melted snow. The year totals 45 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Deal Island itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Salisbury, MD (24 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.