WW2010
University of Illinois

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Isotherms
surface maps

A line connecting points of equal temperature is called an isotherm. That means, at every point along a given isotherm, the values of temperature are the same.

Isotherms are represented by dashed orange contours in the Weather Visualizer. An image of surface temperature reports and isotherms has been given below.

The black numbers are station reports of surface temperature in degrees Fahrenheit, which is the unit for temperature in the U.S.. Most other nations of the world use Celsius.

The isotherms displayed were generated from the observed values of temperature, and have been plotted at intervals of 5 degrees Fahrenheit. The small orange numbers are contour labels, which identify the value of an isotherm (75, 85 degrees Fahrenheit).


Terms for using data resources. CD-ROM available.
Credits and Acknowledgments for WW2010.
Department of Atmospheric Sciences (DAS) at
the University of Illinois at Urbana-Champaign.