A green Yule makes a fat churchyard

[worder]

the meaning, please, thank you.

[FredPuli]

Apparently " Be prepared always; first impressions are deceptive" A green Yule means a mild early part of Winter. In Britain the worst Winter may have a mild start. Historically the very worst weather comes later and often suddenly; this weather may kill thousands. So we should be prepared and not be fooled by the early mildness; being unprepared for the sudden chill we may die for our folly. 'A fat churchyard' means 'a full graveyard' full of the foolish victims.

[incitatus]

Theres more to this as well. influenza, the biggest winter killer, loves mild wet inter weatehr. it helps it spread. so this may be epidemiological advice too.