Parts of Connecticut, including northwestern Connecticut, have a Humid continental climate while other parts, especially southeastern Connecticut, have a Humid subtropical climate, with seasonal extremes tempered by its proximity to the Atlantic Ocean. Winters are cold, with average temperatures ranging from 31°F (−1°C) in the southeast to 23°F (−5°C) in the northwest in January. The average yearly snowfall is about 25–100" (64–254 cm) across the state, with higher totals in the northwest. Spring has variable temperatures with frequent rainfall. Summer is hot and humid throughout the state, with average highs in New London of 81°F (27°C) and 87°F (31°C) in Windsor Locks. Fall months are mild, and bring foliage across the state in October and November. During hurricane season, tropical cyclones occasionally affect the region. Thunderstorms are most frequent during the summer, occurring on average 30 times annually. These storms can be severe, though tornadoes are rare.
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