If the sun sets clear Friday night, it will not rain before Monday night; but if it sets in a cloud, it will rain before Monday night.
Boston, Mass.

If the sun sets clear Friday night, it will not rain before Monday night; but if it sets in a cloud, it will rain before Monday night.
Source: Current Superstitions (1896), entry 939.
Fanny D. Bergen, editor.
Modern normalized navigation; the historical attribution above remains unchanged.