As snow in summer, and as rain in harvest. Snow in summer would be quite unnatural and unheard of (see on Proverbs 25:13). Rain falls in the usual course of things only at stated times; whence arose the phrase of "the early and of latter rains" (see on Proverbs 16:15).
From spring to October or November was the dry season, and a storm at harvest time was regarded, not merely as destructive or inconvenient, but as portentous and even supernatural (see 1 Samuel 12:17, etc.
). The two cases are types of all that is incongruous and unsuitable. The LXX; apparently regarding their experience in Egypt rather than the actual text, translate, "As dew in harvest, and as rain in summer."
So honour is not seemly for a fool (Proverbs 26:8; Proverbs 19:10). It is quite out of place to show respect to a stupid and ungodly man, or to raise him to a post of dignity; such conduct will only confirm him in his folly, give others a wrong impression concerning him, and afford him increased power of mischief.
The Greeks had a proverb about giving honour to unsuitable objects: they called it washing an ass's head with nitre.