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Climate of New York (state)

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Climate of New York (state)

The climate of New York (state) is generally humid continental, transitioning to the warmer humid subtropical climate zone in the southeast part of the state. Winter temperatures average below freezing during January and February in much of the state of New York, but several degrees above freezing along the Atlantic coastline, including New York City and Long Island.

Seasonally, summer-like conditions prevail from May to early September statewide, while areas in far southern New York and New York City have summer conditions from late May through early-mid October. Due to frequent stormy weather and Lake Effect precipitation, the area of New York near the Great Lakes is much more cloudy than southernmost New York and Long Island. Winter-like conditions prevail from November through April in northern New York, and from December through March in southern New York. Greenhouse gas emission is low on a per-capita basis when compared to most other states due to the extensive use of mass transit, particularly across New York City. The significant urbanization within New York City has led to an urban heat island, which causes temperatures to be warmer overnight in all seasons.

Annual precipitation is fairly even throughout the year across the state of New York. The Great Lakes region of New York sees the highest annual rain and snow amounts in the state of New York, and heavy lake-effect snow is common in both western and central New York in winter. In the hotter months, large, long-lived complexes of thunderstorms can invade the state from points to the west, while tropical cyclones can bring rains and winds from the south during the summer and fall. Hurricane impacts on the state occur once every 15 years, with major hurricane impacts every 35 years. An average of ten tornadoes touch down in New York annually. Governors Island, Manhattan, in New York Harbor, is planned to host a US$1 billion research and education center poised to make New York City the global leader in addressing the climate crisis.

The annual average temperature across the state ranges from around 39 °F (4 °C) over the Adirondack Mountains to near 53 °F (12 °C) across the Hudson Valley and Long Island, to around 56 °F (13 °C) within New York City. Weather in New York is heavily influenced by two air masses: a warm, humid one from the southwest and a cold, dry one from the northwest. A cool, humid northeast airflow from the North Atlantic is much less common, and results in a persistent cloud deck with associated precipitation which linger across the region for prolonged periods of time. Temperature differences between the warmer coast and far northern inland sections can exceed 36 degrees Fahrenheit (20 degrees Celsius), with rain near the coast and frozen precipitation, such as sleet and freezing rain, falling inland. Two-thirds of such events occur between November and April. which moves from northeast to southwest.

Unlike the vast majority of the state, New York City features a humid subtropical climate (Koppen Cfa). New York City is an urban heat island, with temperatures 5–7 degrees Fahrenheit (3–4 degrees Celsius) warmer overnight than surrounding areas. In an effort to fight this warming, roofs of buildings are being painted white across the city in an effort to increase the reflection of solar energy, or albedo.

Summers in New York State significantly vary by region. The summer climate is cooler in the Adirondacks due to higher elevation. The Adirondacks typically experience pleasant dry weather in the summer, with average daily maximum temperatures in the range of 66–73 °F (19–23 °C). Evenings in the Adirondacks are chilly, with average daily minimum temperatures ranging on average between 45–54 °F (7–12 °C). Most of Western New York, Central New York, the mid-Hudson Valley and the Catskills have moderate temperatures but are usually humid, with average maximum temperatures ranging 80–85 °F (27–29 °C).

Nights in central New York state are often muggy, minimums averaging between 61–67 °F (16–19 °C). The New York City area and the Lower Hudson Valley in contrast feature more sultry and tropical summers with frequent and often long lasting bouts of high temperatures and dew points. Average maximum temperatures in this area are usually between 86–90 °F (30–32 °C) but slightly cooler by the ocean and south-facing shorelines of Long Island average closer to 84 °F (29 °C). Nights are warm and muggy, dropping to an average of between 68–75 °F (20–24 °C). The record high for New York state is 108 °F (42 °C), set at Troy on July 22, 1926.

Heat waves are common in New York State which bring high heat and humidity. Heat waves occurs at least two times each summer and are an average of 3–5 days. Only the Adirondacks does not see oppressive temperatures during most heat waves in New York State. The Adirondacks have warm to hot temperatures with some humidity during a heat wave, but not to the extent of elsewhere in the state.

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