Climate Comfort Score
78/100
Good
NOAA 1991–2020 normals 56°F annual avg Public-domain federal data
Upper Marlboro, MD Climate
Average temperature, precipitation, and a comfort score, drawn from NOAA NCEI 1991–2020 normals →
- 56°F
- Avg annual temp
- 78/100
- Comfort score
- 45.0"
- Annual precip
- 203d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Upper Marlboro
Upper Marlboro, Maryland averages 56°F a year and scores 78/100 on the comfort index - good, milder than 74% of U.S. cities.
- 56°F
- average temperature, NOAA 1991-2020 normal
- 78/100
- comfort score, milder than 74% of U.S. cities
- 45.0"
- annual precipitation · 16" snow
- 203 days
- frost-free days per growing season
Based on NOAA U.S. Climate Normals (1991–2020) - 30-year averages describing the typical year, not a forecast.
Avg Temperature
56°F (13°C)
Avg High
67°F
Avg Low
45°F
Annual Precip
45.0"
Annual Snow
15.9"
Comfort Score
78/100
Good
Avg Annual Temperature
56°F
30-year mean (NOAA NCEI)
Annual Precipitation
45.0"
Plus 15.9" of snow
Comfort score vs national 100-point ceiling (Upper Marlboro) 78.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Good for the Upper Marlboro area.
How Upper Marlboro compares to every U.S. city
Upper Marlboro's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
78 Top 26% higher than 74% of 6,915 US cities
Each bar is a band; taller bars hold more US cities. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Warming context for Upper Marlboro
MethodologyUpper Marlboro's NOAA 1991-2020 normal sits inside a longer story: U.S. land temperatures have been tracking (and drifting from) the global mean since 1900, and the chart below shows that spread, with the most recent decade running warmer than the 30-year mean.
- United States land mean (NOAA NCEI) +0.11 °C/decade
- Global anomaly (NASA GISTEMP) +0.11 °C/decade
- Paris Agreement thresholds 1.5°C / 2.0°C
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 44°F (7°C) | 25°F (-4°C) | 34°F (1°C) | 3.0" | 5.7" | 24.8 | 0.0 |
| February | 47°F (8°C) | 26°F (-3°C) | 36°F (2°C) | 2.7" | 6.3" | 22.5 | 0.0 |
| March | 55°F (13°C) | 33°F (0°C) | 44°F (7°C) | 3.9" | 1.7" | 16.3 | 0.0 |
| April | 67°F (19°C) | 44°F (6°C) | 55°F (13°C) | 3.4" | 0.0" | 2.6 | 0.4 |
| May | 75°F (24°C) | 54°F (12°C) | 64°F (18°C) | 4.1" | 0.0" | 0.0 | 1.7 |
| June | 84°F (29°C) | 63°F (17°C) | 73°F (23°C) | 4.2" | 0.0" | 0.0 | 6.8 |
| July | 88°F (31°C) | 67°F (20°C) | 78°F (25°C) | 4.2" | 0.0" | 0.0 | 11.0 |
| August | 86°F (30°C) | 65°F (19°C) | 76°F (24°C) | 4.1" | 0.0" | 0.0 | 8.7 |
| September | 80°F (27°C) | 58°F (15°C) | 69°F (21°C) | 4.5" | 0.0" | 0.0 | 3.0 |
| October | 69°F (20°C) | 46°F (8°C) | 57°F (14°C) | 4.1" | 0.0" | 1.9 | 0.2 |
| November | 58°F (14°C) | 36°F (2°C) | 47°F (8°C) | 3.3" | 0.0" | 13.0 | 0.0 |
| December | 48°F (9°C) | 29°F (-2°C) | 38°F (4°C) | 3.5" | 2.2" | 21.9 | 0.0 |
Monthly Precipitation
Average monthly rainfall and snowfall
January 3.0"
Snow: 5.7"
9.6 days with precipitation
February 2.7"
Snow: 6.3"
9.1 days with precipitation
March 3.9"
Snow: 1.7"
10.0 days with precipitation
April 3.4"
10.4 days with precipitation
May 4.1"
10.2 days with precipitation
June 4.2"
10.5 days with precipitation
July 4.2"
9.3 days with precipitation
August 4.1"
8.9 days with precipitation
September 4.5"
7.9 days with precipitation
October 4.1"
8.0 days with precipitation
November 3.3"
7.1 days with precipitation
December 3.5"
Snow: 2.2"
9.8 days with precipitation
Frost Dates & Growing Season
First Fall Freeze
October 29
50% probability date
Last Spring Freeze
April 9
50% probability date
Growing Season
203 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
4,546
Higher = more heating needed
Cooling Degree Days
1,284
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
What Upper Marlboro's climate means for you
Upper Marlboro runs 56°F a year - peaking in July, coldest in January.
- Gardeners get about 203 frost-free days, with the last spring freeze near April 9 - plan the planting calendar around it, not the regional average.
- Energy bills track 4,546 heating and 1,284 cooling degree days a year, higher means the furnace or AC runs more.
- Comparing places to live? Line this city up against nearby cities and the national rankings. See rankings
These are 30-year NOAA normals (1991–2020) - the typical year, not a forecast for any specific season.
Climate Guides
Climate Insight: Upper Marlboro, MD
In Upper Marlboro, Maryland, the NOAA 1991–2020 climate normals put the annual average temperature at 56°F, ranging from a mean daily high of 67°F to a mean daily low of 45°F. July is typically the warmest month of the year, while January is the coldest. As thirty-year averages computed from station USC00189070, these numbers smooth out year-to-year noise into a working baseline for a typical month.
Anyone planning to live, garden, or travel in Upper Marlboro should weigh precipitation alongside temperature: the annual average runs 45.0 inches, with 15.9 inches typically falling as snow. The frost-free season averages 203 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near April 9 and the first fall freeze near October 29. And on the energy front, 4,546 heating degree days and 1,284 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Upper Marlboro scores 78/100 (Good), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. Use the monthly tables above to plan around specific windows, shoulder seasons for mild highs and lows, peak summer for July-driven heat, or deep winter for January-driven cold. All figures here are thirty-year averages: any single year may run warmer, wetter, drier, or cooler than the normal, so treat them as planning guidance rather than forecasts.
Frequently Asked Questions
What is the average temperature in Upper Marlboro, MD? ▼
The average annual temperature in Upper Marlboro, Maryland is 56°F. The warmest month averages 88°F (31°C) and the coldest averages 25°F (-4°C).
How much rain does Upper Marlboro get? ▼
Upper Marlboro receives 45.0 inches of precipitation annually, including 15.9 inches of snow. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Upper Marlboro? ▼
Upper Marlboro has a climate comfort score of 78/100 (Good), milder than 74% of U.S. cities in the PlainClimate database.
When is the growing season in Upper Marlboro? ▼
Upper Marlboro has approximately 203 frost-free days per year, with the last spring freeze around April 9 and the first fall freeze around October 29.
How much energy does heating and cooling require in Upper Marlboro? ▼
Upper Marlboro has 4,546 heating degree days and 1,284 cooling degree days annually, a heating-dominated climate. See our <a href="/guides/reading-weather-data/" class="underline hover:text-brand-600">guide to reading weather data</a> for what these figures mean.
Where does this Upper Marlboro climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00189070 near Upper Marlboro.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00189070. For informational purposes only.
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainClimate Editorial
Every figure on PlainClimate is rendered directly from NOAA 1991-2020 U.S. Climate Normals data, no number is typed in by an editor. This page draws directly on NOAA 1991-2020 U.S. Climate Normals data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.