Mean monthly dew point temperature : January dew point -- April dew point -- July dew point -- October dew point / compiled by A. V. Dodd, U. S. Army from official hourly weather records for periods averaging 10 years in length prior to 1964 -- Mean monthly relative humidity : January relative humidity -- April relative humidity -- July relative humidity -- October relative humidity / adapted from 1:20,000,000-scale maps by Environmental Data Service, Environmental Science Services Administration records for the period 1931-1952 -- Mean annual number of days with snowfall one inch or more / compiled by Environmental Data Service, Environmental Science Services Administration for varying periods 20 years or more in length, prior to 1960.

• Main Authors: Geological Survey (U.S.), Dodd, A. V., United States. Environmental Data Service, United States. Environmental Science Services Administration, Pecora, William T., Gerlach, Arch C., Overstreet, William B.
• Format: Map
• Language: unknown
• Published: United States Department of the Interior Geological Survey 1964
• Subjects: Physical; Climate; Weather; Historical; Data Visualization; glaciers; Alaska
• Online Access: https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~341319~90109460; https://media.davidrumsey.com/MediaManager/srvr?mediafile=/Size4/RUMSEY~8~1/199/14359074.jpg

Eight physical maps representing the United States, featuring dew point and humidity in January, April, July and October, based upon the periods recorded prior to 1964. Maps also show political boundaries, bodies of water, drainage, coastlines and islands. Maps include legends, as well as bar scales and scale statements. Presented with Albers Equal Area Projection. With two inset maps within each map: Principal islands of Hawaii -- Alaska. Colored lithograph. Together, maps are 42 x 31 cm, on sheet 49 x 35 cm. Maps appear in Special subject maps section, subsection Physical : Climate. The national atlas of the United States of America, by the United States Geological Survey; published in Washington D. C., 1970. Bound in navy blue board, with title printed in silver on both front cover and spine. Accompanied by envelope with six overlay sheets, tucked between final page and back cover of volume. Collation: [i-vi], vii-xiii, [1], 2-417, A1, A2, B1, B2, C, D. Atlas contains 770 maps and 18 charts. Includes a dedication, foreward, list of contributors, introduction, table of contents and index to map subjects. Topic covered: physical geography, history, economics, culture, administrative boundaries and cartography. In addition, atlas also provides maps of the world, as related to the United States. Maps show political boundaries, cities, railways, roads, topography, bodies of water, glaciers, drainage, coastlines, islands, water depths and time zones. Topical maps feature other details, such as history, geology, climate, agriculture, population, racial demographics (including indigenous peoples), religion, language and transportation. Some maps use data visualization to further illustrate geographical information, with charts overlaid upon the landscape. "Adapted from "About The National Atlas of the United States of America," by the U.S. Geological Survey: The National Atlas of the United States of America was published in 1970. It was designed to be of practical use to decision makers in government and business, ...