Based on the Random House Dictionary, © Random House, Inc. 2012.
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| a fog that does not moisten exposed surfaces |
| a circulation of winds around a region of high atmospheric pressure, clockwise in the Northern Hemisphere, counterclockwise in the Southern Hemisphere |
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isotherm  (ī'sə-thûrm') Pronunciation Key
A line drawn on a weather map connecting points that have the same temperature. Each point can mark one temperature reading or an average of several readings. |
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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isotherm
line drawn on a map or chart joining points with the same temperature. Isotherms are commonly used in meteorology to show the distribution of temperature at the Earth's surface or on a chart indicating constant level or constant pressure. They are also used to show the time variation of temperature with height in the atmosphere or with depth in soil or water; the characteristics of heat flow into soil, for example, are easily visualized from a graph showing temperature as a function of depth and time. A convenient way to compare thermal climates is to plot the temperature for each location as a function of time of day (vertical axis) and time of year (horizontal axis)
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