New Haven, CT Weather

According to the Köppen classification, New Haven is cfa, or a Temperate climate. The city has hot, humid summers and cool to cold winters. From May to late September, the weather is typically hot and humid, with average temperatures exceeding 80 °F (27 °C) on 70 days per year. In summer, the Bermuda High creates as southern flow of warm and humid air, with frequent thundershowers. October to early December is normally mild to cool late in the season, while early spring (April) can be cool to warm. Winters are moderately cold with both rain and snow fall. The weather patterns that affect New Haven result from a primarily offshore direction, thus reducing the marine influence of Long Island Sound—although, like other marine areas, differences in temperature between areas right along the coastline and areas a mile or two inland can be large at times. During summer heat waves, temperatures may reach 95 °F (35 °C) or higher on occasion with heat-index values of over 100 °F (38 °C). Tropical cyclones have struck New Haven in the past, including 1938 Hurricane (Long Island Express), Hurricane Carol in 1954, Hurricane Gloria in 1985.