Connecticut is the southernmost state in the New England region of the United States. As of the 2010 Census, it has the highest per-capita income, second-highest level of human development behind Massachusetts, and highest median household income in the United States. It is bordered by Rhode Island to the east, Massachusetts to the north, New York to the west, and the Long Island Sound to the south. Its capital is Hartford, and its most populous city is Bridgeport. Historically the state is part of New England as well as the tri-state area with New York and New Jersey, which together make up metropolitan New York City. The state is named for the Connecticut River which approximately bisects the state.

Connecticut’s first European settlers were Dutchmen who established a small, short-lived settlement called Fort Hoop in Hartford at the confluence of the Park and Connecticut Rivers. Half of Connecticut was initially claimed by the Dutch colony New Netherland, which included much of the land between the Connecticut and Delaware Rivers, although the first major settlements were established in the 1630s by the English. Thomas Hooker led a band of followers from the Massachusetts Bay Colony and founded the Connecticut Colony; other settlers from Massachusetts founded the Saybrook Colony and the New Haven Colony. The Connecticut and New Haven colonies established documents of Fundamental Orders, considered the first constitutions in America. In 1662, the three colonies were merged under a royal charter, making Connecticut a crown colony. Connecticut was one of the Thirteen Colonies which rejected British rule in the American Revolution.

Connecticut is the third smallest state by area, the 29th most populous, and the fourth most densely populated of the fifty states. It is known as the “Constitution State”, the “Nutmeg State”, the “Provisions State”, and the “Land of Steady Habits”. It was influential in the development of the federal government of the United States (see Connecticut Compromise). The Connecticut River, Thames River, and ports along Long Island Sound have given Connecticut a strong maritime tradition which continues today. The state also has a long history of hosting the financial services industry, including insurance companies in Hartford and hedge funds in Fairfield County.

CLIMATE

Connecticut lies at the rough transition zone between the southern end of the humid continental climate, and the northern portion of the humid subtropical climate. Northern Connecticut generally experiences a climate with cold winters with moderate snowfall and hot, humid summers. Far southern and coastal Connecticut has a climate with cool winters with a mix of rain and infrequent snow, and the long hot and humid summers typical of the middle and lower East Coast.

Precipitation

Connecticut sees a fairly even precipitation pattern with rainfall/snowfall spread throughout the 12 months. Connecticut averages 56% of possible sunshine (higher than the U.S. national average), averaging 2,400 hours of sunshine annually. On average, about one third of days in the state see some amount of precipitation each year. Occasionally, some months may see extremes in precipitation, either much higher or lower than normal, though long-term droughts and floods are rare.

Seasons

Connecticut has 4 well defined seasons, though major changes in temperature from day to day are common.

Early spring (April) can range from slightly cool (40s to low 50s F) to warm (65 to 70 F), while mid and late spring (late April/May) is warm. By late May, the building Bermuda High creates a southerly flow of warm and humid tropical air, bringing hot weather conditions throughout the state. Average highs are 81 °F (27 °C) in New London and 85 °F (29 °C) in Windsor Locks at the peak of summer in late July. On occasion, heat waves with highs from 90 to 100 °F (38 °C) occur across Connecticut. Connecticut’s record high temperature is 106 °F (41 °C) which occurred in Danbury on July 15, 1995.

Although summers are sunny in Connecticut, quick moving summer thunderstorms can bring brief downpours with thunder and lightning. Occasionally these thunderstorms can be severe, and the state usually averages one tornado per year. During hurricane season, the remains of tropical cyclones occasionally affect the region, though a direct hit is rare. Some notable hurricanes to impact the state include the 1938 New England hurricane, Hurricane Carol in 1954, Hurricane Sandy in 2012, and Hurricane Isaias in 2020.

Weather commonly associated with the fall season typically begins in October and lasts to the first days of December. Daily high temperatures in October and November range from the 50s to 60s (Fahrenheit) with nights in the 40s and upper 30s. Colorful foliage begins across northern parts of the state in early October and moves south and east reaching southeast Connecticut by early November. Far southern and coastal areas, however, have more oak and hickory trees (and fewer maples) and are often less colorful than areas to the north. By December daytime highs are in the 40s °F for much of the state, and average overnight lows are below freezing.

Winters (December through mid-March) are generally cold from south to north in Connecticut. The coldest month (January) has average high temperatures ranging from 38 °F (3 °C) in the coastal lowlands to 33 °F (1 °C) in the inland and northern portions on the state. The lowest temperature recorded in Connecticut is −32 °F (−36 °C) which has been observed twice: in Falls Village on February 16, 1943, and in Coventry on January 22, 1961. The average yearly snowfall ranges from about 60 inches (1,500 mm) in the higher elevations of the northern portion of the state to only 20–25 inches (510–640 mm) along the southeast coast of Connecticut (Branford to Groton). Generally, any locale north or west of Interstate 84 receives the most snow, during a storm, and throughout the season. Most of Connecticut has less than 60 days of snow cover. Snow usually falls from late November to late March in the northern part of the state, and from early December to mid-March in the southern and coastal parts of the state.

During winter, Connecticut is subject to blizzards and nor’easters, which may produce as much as several feet of snow across the state along with heavy winds, sometimes resulting in significant damage. Ice storms also occur on occasion, such as the Southern New England ice storm of 1973 and the December 2008 Northeastern United States ice storm. These storms can cause widespread power outages and damage.