Winters in Omaha are extremely cold, with temperatures often dropping below -20°C and averaging around -10°C. Spring is a gradual warming period, starting with chilly days in March and April, but eventually reaching mild highs by May. Summers are warm to hot, with temperatures frequently reaching the mid-30s Celsius, but rarely exceeding 40°C. Autumn brings a return to cooler temperatures, with September being the warmest month of the season before a steady decline into winter.