Midsummer Humidity, July 1896
A map from 1896 of the United States showing the average absolute humidity for the month of July (midsummer), given in the number of grains of water per cubic foot of surface air....

Typical Air Pressure and Wind Direction, July 1896
A map from 1896 of the United States showing typical conditions of normal air pressure adjusted to sea level, and normal wind directions for July....

Precipitation Chart, March 1, 1891–September 25, 1891
A map from the United States Department of Agriculture showing precipitation departures in 1891. "The seasonal conditions of rainfall from March 1 to September 25 throughout the United States, or during the growing period of the present year. Fr...

Temperature Departures, March 1, 1891–September 25, 1891
A map from 1891 showing comparative temperature departures with averages from previous years. "Plate VI exhibits the thermal conditions of the season as compared with the average of previous years, the shaded portions showing that in New England...

Weather Chart, March 27, 1890
A map from 1891 showing atmospheric conditions during a tornado in Kentucky on March 27, 1890....

Path of a Hurricane, September 12–14, 1878
A map from 1892 of the United States showing the track of a hurricane that crossed the eastern coast between September 12 and 14, 1878. This hurricane struck South Carolina on September 12, 1878 and caused at least 9 deaths before becoming extra&ndas...

War Department Weather Map, September 28, 1872
An example of a War Department Weather Map from Washington, for Saturday, September 28, 1872, at 7:35 a.m....

War Department Weather Map, September 28, 1872
An example of a War Department Weather Map from Washington, on Saturday, September 28, 1872, at 11 p.m....

Weather of the United States, Tuesday November 16, 1909
A sample weather map for Tuesday, November 16, 1909 showing typical symbols found on winter weather maps at the time, including symbols for clear weather, partly cloudy, cloudy, rain, and snow, wind arrows showing prevailing wind direction, isobar li...

Weather of the United States, Wednesday, November 17, 1909
A sample weather map for Tuesday, November 17, 1909 showing typical symbols found on winter weather maps at the time, including symbols for clear weather, partly cloudy, cloudy, rain, and snow, wind arrows showing prevailing wind direction, isobar li...