Upper Marlboro, MD climate
Upper Marlboro has chilly winters and warm summers. A typical July afternoon reaches 88°, a January night drops to 26°, and about 16 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Upper Marlboro feels like
Winter
Spring
Summer
Fall
Upper Marlboro 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 | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 44° | 26° | 3.0" | 5.7" | 10 | 4 | 27° – 42° |
| February | 48° | 28° | 2.7" | 6.3" | 9 | 6 | 27° – 45° |
| March | 56° | 34° | 4.0" | 1.7" | 10 | 2 | 39° – 54° |
| April | 67° | 44° | 3.3" | 0 | 10 | 0 | 52° – 61° |
| May | 76° | 54° | 4.0" | 0 | 10 | 0 | 60° – 71° |
| June | 84° | 63° | 4.3" | 0 | 11 | 0 | 69° – 78° |
| July | 88° | 68° | 4.5" | 0 | 9 | 0 | 73° – 81° |
| August | 86° | 66° | 4.2" | 0 | 9 | 0 | 71° – 80° |
| September | 80° | 59° | 4.5" | 0 | 8 | 0 | 66° – 74° |
| October | 69° | 47° | 3.8" | 0 | 8 | 0 | 54° – 64° |
| November | 58° | 37° | 3.1" | 0 | 7 | 0 | 41° – 52° |
| December | 48° | 30° | 3.7" | 2.2" | 10 | 2 | 30° – 50° |
| Year | 67° | 46° | 45.1" | 15.9" | 111 | 14 |
“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 Upper Marlboro
Upper Marlboro gets 45 inches of rain and melted snow a year. July is the wettest month and February the driest. Rain or snow falls on about 111 days a year. Snow covers the ground about 14 days of the year.
About 203 frost-free days a year
In half of years the last 32° night comes by April 9 and the first one by October 29. That leaves about 203 frost-free days for gardens, longer than 74% of U.S. towns.
Heating and cooling a home in Upper Marlboro
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Upper Marlboro, 78% of that work is heating and 22% 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.
Upper Marlboro and its neighbors
Upper Marlboro borders 5 towns with climate data. January nights across them vary by 0.1°. Queensland has the coldest January nights (26°) and Marlboro Village the hottest July afternoons (88°). Upper Marlboro’s January low is 26° and its July high 88°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Upper Marlboro 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 Upper Marlboro averaged 1.6° warmer than the 1900s. The biggest change is in December (+2.7°). The shift is larger than in 74% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Upper Marlboro’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 Upper Marlboro’s climate
What is the coldest month in Upper Marlboro?
January, with a typical high of 44° and a low of 26°.
What is the hottest month in Upper Marlboro?
July, with a typical high of 88° and a low of 68°. About 32 days a year reach 90°.
How much snow does Upper Marlboro get?
About 16 inches in a normal winter, most of it in February.
When is the first frost in Upper Marlboro?
In half of years the first 32° night comes by October 29, and the last spring frost by April 9.
What is the rainiest month in Upper Marlboro?
July, with 4.5 inches of rain and melted snow. The year totals 45 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Upper Marlboro itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Upper Marlboro 3 Nnw, MD (3 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.