Manhattan's winters are cold and variable, with temperatures often below freezing in January and February, but occasional warmth in March. Spring brings a gradual warming trend, with April and May temperatures steadily rising into the mid-20s Celsius. Summer is warm and humid, with July and August highs often reaching the low 30s Celsius, while September sees a return to more pleasant temperatures. Autumn is mild, with October and November temperatures cooling back down towards average winter levels, only to rise again in December.