Detroit's winters are harsh and cold, with temperatures often plummeting below -10°C in January and February, but averaging around 0°C. Spring is a slow warming process, with March temperatures finally rising above freezing, while April and May bring increasingly mild conditions. Summer is warm and sunny, with July and August being the hottest months, with average highs reaching 23-24°C. Autumn brings a return to cooler temperatures, with September being the warmest month of the season, but October and November are chilly, with averages around 4-6°C. Winters are cold again in December, mirroring January's chill.