The greatest number of hot days occurred during the last two multiyear periods (2010–20–2020 Figure 2a). Temperatures in Connecticut have risen almost 3.5☏ since the beginning of the 20th century (Figure 1). Less warming is expected under a lower emissions future (the coldest end-of-century projections being about 2☏ warmer than the historical average green shading) and more warming under a higher emissions future (the hottest end-of-century projections being about 10☏ warmer than the hottest year in the historical record red shading). Historically unprecedented warming is projected to continue through this century. Observed temperatures are generally within the envelope of model simulations of the historical period (gray shading). Shading indicates the range of annual temperatures from the set of models. Temperatures in Connecticut (orange line) have risen almost 3.5☏ since the beginning of the 20th century. Projected changes for 2006–2100 are from global climate models for two possible futures: one in which greenhouse gas emissions continue to increase (higher emissions) and another in which greenhouse gas emissions increase at a slower rate (lower emissions). Days with temperatures below 0☏ range from an annual average of 7 days in Falls Village to 2 days in Hartford and 1 day in New Haven.įigure 1: Observed and projected changes (compared to the 1901–1960 average) in near-surface air temperature for Connecticut. Days with temperatures above 90☏ vary from an annual average of 8 days in Falls Village, in the northwest, to 13 days in Hartford (Hartford Brainard Field), in the central part of the state, and 4 days in New Haven, along the coast in the south. Extreme temperatures vary across the state. The annual average temperature is 49.9☏, with average temperatures of 27.2☏ in January and 72.4☏ in July. Coastal areas experience warmer winters and longer frost-free seasons than inland areas. The jet stream, often located near the state, gives it highly variable weather patterns and generally abundant precipitation throughout the year. Its climate is characterized by cold, snowy winters and warm, humid summers. The topography varies from hilly slopes in the northwestern portion of the state to diverse sections of rocky high points and marshes along the Long Island Sound of the southeastern coast. Combined with its northerly latitude, its geographic location exposes the state to both the moderating and moistening influence of the Atlantic Ocean and the effects of the hot and cold air masses from the interior of the continent. Connecticut is located on the eastern coast of the North American continent.
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