Il fait trรจs froid.
Eel feh treh frwah
It is very cold.
Simple
Il fait un froid glacial aujourd'hui, couvre-toi bien.
Eel feh uhn frwah glah-SYAL oh-zhoor-DWEE, koov-rwah BYAN
It's glacial cold today, cover yourself well.
glacial = icy/glacial, natural intensifier
Il fait un froid de canard, je ne sens plus mes doigts !
Eel feh uhn frwah duh kah-NAR, zhuh nuh sahn ploo meh dwah
It's duck's cold, I can't feel my fingers anymore!
froid de canard = classic French idiom; ne sens plus = can't feel anymore
More French Weather Phrases