I agree, 1°C is too coarse, but I also think that the decades in °F map out better to human comfort, eg >100 intolerably hot, 90-99 hot, 80-89 warm, 70-79 comfortable, 60-69 cool, 50-59 cold, 40-49 colder, 30-39 freezing, 20-29 below freezing, 10-19 bloody freezing, 0-9 CougTek comfort zone.