|weather map or weather chart|
|a synoptic chart showing weather conditions, compiled from simultaneous observations taken at various weather stations|
|weather chart or weather chart|
A map showing the weather patterns throughout a given region.
any map or chart that shows the meteorological elements at a given time over an extended area. The earliest weather charts were made well before 1835 by collecting synchronous weather reports by mail. The first telegraphic collection of synoptic meteorological reports and their mapping for forecasting was accomplished by Urbain-J.-J. Le Verrier during the mid-1800s.
Learn more about weather map with a free trial on Britannica.com.