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New York Climate

Under the Köppen climate classification New York City has a humid subtropical climate (Cfa), and using the 0 °C (32 °F) threshold it is the northernmost major city on the continent with such categorization.

The area averages 234 days with at least some sunshine annually, and averages 58% of possible sunshine annually, accumulating 2,400 to 2,800 hours of sunshine per annum.

Winters are cold and damp, and prevailing wind patterns that blow offshore minimize the moderating effects of the Atlantic Ocean. Yet the Atlantic and the partial shielding of the Appalachians keep the city warmer in the winter than inland North American cities located at similar or lesser latitudes such as Pittsburgh, Cincinnati, and Indianapolis. The average temperature in January, the area's coldest month, is 32.1 °F (0.1 °C). However temperatures in winter could for a few days be as low as 10 °F (−12 °C) and as high as 50 °F (10 °C). Spring and autumn are unpredictable, and can range from chilly to warm, although they are usually mild with low humidity. Summers are typically hot and humid with a July average of 76.5 °F (24.7 °C). Nighttime conditions are often exacerbated by the urban heat island phenomenon, and temperatures exceed 90 °F (32 °C) on average of 18 days each summer and can exceed 100 °F (38 °C) every 4–6 years.

The city receives 49.7 inches (1,260 mm) of precipitation annually, which is fairly spread throughout the year. Average winter snowfall for 1971 to 2000 has been 22 inches (56 cm), but this usually varies considerably from year to year. Hurricanes and tropical storms are rare in the New York area, but are not unheard of and always have the potential to strike the area.

Extreme temperatures have ranged from −15 to 106 °F (-26 to 41 °C), recorded on February 9, 1934 and July 9, 1936, respectively.
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