Janiveer is an alteration of the French name for January, and the proverb is very old.
So March should be normally dry and windy.
This, too, they understood, and hence the strong proverb:
“A bushel of March dust
Is worth a king’s ransom.”
And another:
“March hack ham,
Come in like a lion, go out like a lamb.”
So April and May should be cool and moist. It is their normal condition in regular, healthy, and productive seasons. The grass and grain require such conditions; and the spring rains are needed to supply the excessive summer evaporation. This, too, they well understood. And hence the proverbs:
“A cold April the barn will fill.”
“A cool May, and a windy,
Makes a full barn and a findy.”
And—
“April and May are the keys of the year.”