brumal (adj.)
"belonging to winter," 1510s, from Latin brumalis, from bruma "winter" (see brume). The Latin word also is the ultimate source of Brumaire, second month (Oct. 22-Nov. 20) in calendar of the French Republic, literally "the foggy month," coined 1793 by Fabre d'Eglantine from French brume "fog" (see brume).