isoneph

isoneph

[′ī·sə‚nef]
(meteorology)
A line drawn through all points on a map having the same amount of cloudiness.
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References in periodicals archive ?
But from November through April as much as 1/4 to 1/3 of the country is on the unfavorable side of the 70 percent "isoneph" (line connecting points of equal cloudiness).