Theodore Roosevelt Island
Part of Theodore Roosevelt Island National Memorial

Also Known As: Roosevelt Island, Barbados Island, Mason's Island, Masons Island, Anacosta Island, Anacostan Island, Anacostian Island, Anacostien Ile, Anacostin Island, Anacostine Isle, Analostan Island, Analostian Island, Analostien Island, Annalostan Island, Antecostan Island, Barbadoes Island, Colonel Masons Island, George Mason Island, My Lords Barbados, My Lords Island, Teddy Roosevelt Island, and Theodore Roosevelt Insel.



Area of dry or relatively dry land surrounded by water or low wetland.
land Icon Land
Map Marker

GPS Coordinates

Latitude, Longitude:
38.8956674°, -77.0619219°
Elevation Icon


36 ft. (11 m.)

Topographic Map

US Topo Map

The USGS (U.S. Geological Survey) publishes a set of the most commonly used topographic maps of the U.S. called US Topo that are separated into rectangular quadrants that are printed at 22.75"x29" or larger. Theodore Roosevelt Island is covered by the Washington West, DC US Topo Map quadrant

Free US Topo Map PDF Order Waterproof Printed Topo Map
Water Icon Water
Land Icon Land
Man-made Icon Man-made

Nearby Islands

Little Island 0.3 mi

Nearby Cities

Nearby Points of Interest

Columbia Athletic Club (historical) Man-made 0.0 mi
Theodore Roosevelt Island National Memorial Man-made 0.0 mi
Widows Mite (historical) Man-made 0.1 mi
Woods Trail Man-made 0.1 mi
Swamp Trail Man-made 0.1 mi

Historical Weather

Below are weather averages from 1971 to 2000 according to data gathered from the nearest official weather station. The nearest weather station for both precipitation and temperature measurements is WASHINGTON REAGAN NTL AP which is approximately 3 miles away and has an elevation of 10 feet (26 feet lower than Theodore Roosevelt Island). Because the nearest station and this geographic feature may have differences in elevation and topography, the historic weather at the two separate locations may be different as well.

Average Daily Temperatures by Month (°F)

Average Monthly Precipitation (in inches)

Month Precip AVG High Temp AVG Low Temp
January 3.21" 42.5° 27.3°
February 2.63" 46.5° 29.7°
March 3.60" 55.7° 37.3°
April 2.77" 66.3° 45.9°
May 3.82" 75.4° 55.8°
June 3.13" 83.9° 65.0°
July 3.66" 88.3° 70.1°
August 3.44" 86.3° 68.6°
September 3.79" 79.3° 61.8°
October 3.22" 68.0° 49.6°
November 3.03" 57.3° 40.0°
December 3.05" 47.0° 32.0°

Summer High Temps

This location's average summer high temps are higher than 59% of other locations on record.

Winter Low Temps

This location's average winter low temps are higher than 71% of other locations on record.

Precipitation Levels

This location's average precipitation levels are higher than 58% of other locations on record.