WEATHER

muggy /ˈmʌɡi/ (adv):

​# (of weather) warm and slightly wet in an unpleasant way.

SYNONYM close;

a muggy August day.

close /kləʊs/ (adj):

# (comparative closer, superlative closest) warm in an uncomfortable way because there does not seem to be enough fresh air.

SYNONYM stuffy;

It’s very close today - I think there’s going to be a storm.

stuffy /ˈstʌfi/ (adj):

# (comparative stuffier, superlative stuffiest) ​(of a building, room, etc.) warm in an unpleasant way and without enough fresh air.

a stuffy room

It gets very hot and stuffy in here in summer.

equable /ˈekwəbl/ (adj):

# (formal) (of weather) keeping a steady temperature with no sudden changes.

an equable climate.