New York has a humid continental climate resulting from the constant winds that bring cold air from inside the American continent. New York City has cold winters, but the coastal location of the city keeps temperatures slightly warmer than inland regions, helping to moderate the amount of snow, which is on average from 63.5 to 88.9 cm per year. The city has a warm period lasts an average of 199 days between seasonal freezes. Spring and autumn are erratic and can vary from cold and snowy to hot and humid. Summer is warm and humid, with temperatures of 30 ° C or more on average between 18 and 25 days each summer.