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isohyet
Contours..
Because rainfall is very variable and localized, it is not generally displayed as a line on any given map. The usual depiction is by color code, which refers to areas of a similar amounts of rainfall expressed in millimeters.
The two diagonals, and the two lines joining the midpoints of opposite sides.
There are four:the two diagonals, andthe two lines joining the midpoints of opposite sides.
isohyet
Isohytes are lines drawn on maps joining places of equal rainfall.
Isohyets.
Contours..
a contour line joins places of equal elevation
isotherms
isotherms
Those lines are "isobars."
isonephs
Air pressure.
isobars
isobars