Garretts Mill, MD climate
Garretts Mill has chilly winters and warm summers. A typical July afternoon reaches 86°, a January night drops to 24°.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Garretts Mill feels like
Winter
Spring
Summer
Fall
Garretts Mill 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 | 41° | 24° | 2.9" | 24° – 40° |
| February | 44° | 26° | 2.5" | 25° – 43° |
| March | 53° | 32° | 3.6" | 37° – 52° |
| April | 65° | 42° | 3.5" | 50° – 59° |
| May | 74° | 51° | 4.4" | 58° – 69° |
| June | 82° | 60° | 3.8" | 67° – 74° |
| July | 86° | 64° | 4.0" | 71° – 79° |
| August | 84° | 63° | 3.3" | 69° – 77° |
| September | 78° | 55° | 4.4" | 64° – 70° |
| October | 66° | 44° | 3.3" | 52° – 63° |
| November | 55° | 35° | 3.1" | 39° – 50° |
| December | 44° | 27° | 3.4" | 27° – 46° |
| Year | 64° | 44° | 42.2" |
“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 Garretts Mill
Garretts Mill gets 42 inches of rain and melted snow a year. May is the wettest month and February the driest.
About 175 frost-free days a year
In half of years the last 32° night comes by April 26 and the first one by October 18. That leaves about 175 frost-free days for gardens, shorter than 54% of U.S. towns.
Heating and cooling a home in Garretts Mill
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Garretts Mill, 86% of that work is heating and 14% is cooling, so the furnace matters far more than the air conditioner.
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 Garretts Mill 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 Garretts Mill averaged 1.5° warmer than the 1900s. The biggest change is in December (+2.8°). The shift is larger than in 68% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Garretts Mill’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 27° to 46°. September is the most reliable, staying within 7°.
Common questions about Garretts Mill’s climate
What is the coldest month in Garretts Mill?
January, with a typical high of 41° and a low of 24°.
What is the hottest month in Garretts Mill?
July, with a typical high of 86° and a low of 64°. About 25 days a year reach 90°.
When is the first frost in Garretts Mill?
In half of years the first 32° night comes by October 18, and the last spring frost by April 26.
What is the rainiest month in Garretts Mill?
May, with 4.4 inches of rain and melted snow. The year totals 42 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Garretts Mill itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Sharpsburg 5 S, MD (4 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.