A (real) toad-strangler American singular noun informal
Used to implly a very heavy rain
It's dangerous to drive in a toad- strangler.
We can't go on a picnic today because it's a real toad-strangler out there.
Rainy, wet weather
If the heavens open, it starts to rain heavily.
Used to mean that it is the high humidity that makes a person uncomfortable rather than the degree of heat
Intensely hot and irritated
Wonderful weather, particularly on a day when an outdoor event is scheduled
The origin of this expression is not clear.
People tend to remember the bad things others do and while they easily forget or get rid of others' good things.