icy -adjective- slippery because of ice The roads are icy so please avoid driving down any hills.
lightning -noun- electric flash caused by two clouds hitting The outdoor pool always closes when the lifeguards suspect lightning.
mild -adjective- temperature that is warmer than average(in a cold season) It's quite mild out so I didn't bother with a hat or mittens.
meteorologist -noun- a person who studies weather patterns The meteorologist predicted that the cold spell would be over by now.
minus/negative -adjective- indicates that a temperature is below zero It was minus twenty degrees at the top of the skil hill.
overcast -adjective- no sun is visible The sky is overcast this morning, but the sun is supposed to come out by late afternoon.