Park climate1991–2020 climate normals87 m source elevationNASA POWER

Twelve-month long-term climate normals including temperature, precipitation, humidity, and daylight cycles

Mallows Bay–Potomac River National Marine Sanctuary Monthly Climate Averages and Atmospheric Patterns

Name: Mallows Bay–Potomac River National Marine Sanctuary monthly climate normals
Creator: NASA POWER

View the 1991 to 2020 monthly climate normals for Mallows Bay–Potomac River National Marine Sanctuary, derived from a single representative point at an elevation of 87.42 meters. This dataset provides a systematic breakdown of average daily precipitation rates, mean temperature fluctuations, relative humidity, wind speeds, and daylight hours to characterize the atmospheric rhythm at this location. Measurements reflect long-term statistical averages rather than current weather or site-wide climate variations.

View park overview Browse climate zones

A stylized illustration of the Mallows Bay shoreline featuring remains of historic shipwrecks protruding from calm water, surrounded by lush vegetation and a sandy beach.

Annual climate pattern

A large January-to-July temperature rise with a steadier precipitation cycle

Mallows Bay–Potomac River Sanctuary annual temperature and rainfall pattern

Mallows Bay–Potomac River National Marine Sanctuary’s sampled mean temperature changes from 0.41 °C in January to 25.84 °C in July, with monthly average minima and maxima showing the seasonal thermal range. Precipitation varies less, from 2.46 mm/day in February to 3.77 mm/day in September; these 1991–2020 values belong to one 87.42 m coordinate rather than the whole sanctuary.

Mean temperatureAverage minimum–maximum rangePrecipitation

Annual mean: 13.1 °C
Warmest month: July
Coolest month: January
Wettest month: September

Twelve-month climate

Analyze average temperature bounds, daily precipitation rates, humidity, wind, and daylight across the calendar year.

Mallows Bay–Potomac River National Marine Sanctuary Weather by Month: Twelve-Month Climate Comparison

Evaluating twelve distinct monthly climate records helps trace long-term temperature ranges and precipitation patterns across the protected sanctuary coordinate. Comparing average minimum and maximum bounds alongside humidity, wind, and calculated daylight reveals complete seasonal variations.

	Mean temperature	Precipitation	Humidity	Wind speed	Daylight
January	0.4 °C-12° to 17.1°	2.5 mm/day	82.4%	2.8 m/s	9.7 hours
February	1.8 °C-10.3° to 18°	2.5 mm/day	81.3%	2.9 m/s	10.6 hours
March	6.3 °C-7.1° to 22.8°	3.1 mm/day	78.8%	3 m/s	11.8 hours
April	12.5 °C-1.7° to 27.8°	2.9 mm/day	76%	2.7 m/s	13 hours
May	18 °C4.5° to 31.4°	3.5 mm/day	76.1%	2.3 m/s	14.1 hours
June	23.1 °C10.4° to 35.2°	3.7 mm/day	72.3%	2 m/s	14.6 hours
July	25.8 °C14.9° to 37°	3.5 mm/day	68.1%	1.8 m/s	14.4 hours
August	24.8 °C14.1° to 36.2°	3.1 mm/day	69%	1.8 m/s	13.5 hours
September	20.8 °C8° to 33.6°	3.8 mm/day	71.8%	2.1 m/s	12.2 hours
October	13.9 °C0.6° to 28.9°	2.9 mm/day	75.3%	2.3 m/s	10.9 hours
November	7.4 °C-4.5° to 22.9°	2.7 mm/day	77.8%	2.5 m/s	9.9 hours
December	2.5 °C-8° to 18.1°	2.8 mm/day	82.7%	2.5 m/s	9.4 hours

Compare two months

See two months side by side and how much they differ. Both use the same 1991–2020 climate normals and NASA POWER data point as the table above, so they show typical conditions, not a forecast.

First month

Second month

Mean temperature: January: 0.4 °C; July: 25.8 °C; Change from January to July: +25.4 °C
Precipitation: January: 2.5 mm/day; July: 3.5 mm/day; Change from January to July: +1 mm/day
Daylight: January: 9.7 hours; July: 14.4 hours; Change from January to July: +4.7 hours

Calculated climate highlights

Comparative monthly normals for temperature, precipitation, humidity, wind, and daylight duration

Calculated Monthly Climate Highlights and Averages for Mallows Bay–Potomac River National Marine Sanctuary

Comparative monthly normals summarize long-term temperature, precipitation, humidity, wind, and daylight variations across a representative coordinate of Mallows Bay–Potomac River National Marine Sanctuary. Statistical calculations establish baseline averages rather than observed weather extremes or localized conditions.

Warmest month: July25.8 °C
Coolest month: January0.4 °C
Wettest month: September3.8 mm/day
Driest month: February2.5 mm/day
Most humid month: December82.7%
Windiest month: March3 m/s
Longest daylight: June14.6 hours

Interactive climate map

National park climate map

Open the climate map to compare monthly temperature, precipitation, and other averages.

Global National Park Climate Map

Other park climates

Analyze monthly temperature, precipitation, and regional atmospheric patterns across diverse protected landscapes

Comparing Mallows Bay–Potomac River National Marine Sanctuary Climate Profiles Across Protected Areas

Standardized monthly climate profiles enable systematic comparison of long-term temperature, precipitation, humidity, wind, and daylight variations across different protected landscapes. Evaluating these atmospheric norms alongside Mallows Bay–Potomac River National Marine Sanctuary reveals distinct geographic patterns and seasonal rhythms in natural environments.