noun
cloudy weather during the herring season near Hokkaido
A traditional seasonal term for overcast skies common along the Hokkaido coast from the third to the sixth lunar month, when herring fishing was active. Now mostly a historical or regional weather expression.
北海道の沿岸では、春先に鰊曇りと呼ばれる曇り空が続くことがある。
Along the coast of Hokkaido, overcast skies called nishingumori sometimes persist in early spring.