Connecticut Weather by Month
Connecticut, located in the northeastern United States, experiences a humid continental climate characterized by four distinct seasons. The state enjoys warm, humid summers and cold winters, with spring and fall offering mild and pleasant weather. Coastal areas, such as those along Long Island Sound, experience slightly milder winters and cooler summers compared to the inland regions due to the moderating influence of the Atlantic Ocean. Winters in Connecticut can be harsh, with frequent snowfalls and cold temperatures, particularly in the northern parts of the state. Summers are generally warm, with occasional heatwaves, while spring and fall are marked by vibrant foliage and blooming landscapes. Connecticut’s diverse geography, ranging from coastal towns to rolling hills and forests, offers a variety of outdoor activities year-round. Whether you’re exploring the historic towns, enjoying the beautiful coastline, or hiking in the state’s numerous parks and forests, Connecticut’s climate provides a dynamic backdrop for all seasons.
Average Temperature and Precipitation by Month
| Month | Avg Temp (°F) | Avg Temp (°C) | Avg Precipitation (inches) |
|---|---|---|---|
| January | 30°F | -1°C | 3.5 |
| February | 32°F | 0°C | 3.1 |
| March | 40°F | 4°C | 4.0 |
| April | 50°F | 10°C | 4.2 |
| May | 60°F | 16°C | 4.3 |
| June | 69°F | 21°C | 4.0 |
| July | 74°F | 23°C | 4.1 |
| August | 72°F | 22°C | 4.0 |
| September | 65°F | 18°C | 4.1 |
| October | 54°F | 12°C | 4.4 |
| November | 44°F | 7°C | 4.2 |
| December | 34°F | 1°C | 3.9 |
Monthly Weather, Clothing, and Landmarks
January
Weather: January is the coldest month in Connecticut, with average temperatures ranging from 20°F to 40°F (-6°C to 4°C). The state experiences frequent snowfalls, particularly in the northern regions, and icy conditions are common. Coastal areas may see milder temperatures but are still cold and occasionally snowy.
Clothing: To stay warm, dress in layers, including thermal underwear, sweaters, and a heavy winter coat. Hats, gloves, and scarves are essential, and waterproof boots with good insulation are recommended for dealing with snow and ice.
Landmarks: January is a great time to visit Connecticut’s indoor attractions. The Wadsworth Atheneum Museum of Art in Hartford offers a vast collection of American and European art, providing a cultural retreat from the cold. For those interested in history, the Mark Twain House and Museum, also in Hartford, provides a fascinating glimpse into the life of the famous author, with tours of his beautifully preserved Victorian home.
February
Weather: February remains cold in Connecticut, with temperatures ranging from 22°F to 42°F (-5°C to 6°C). Snowfall continues to be frequent, and icy conditions persist, particularly in the mornings and evenings. The days are still short, but by the end of the month, there are signs of the approaching spring.
Clothing: Similar to January, layering is key. Warm coats, hats, gloves, and scarves are necessary. Waterproof and insulated footwear is important for navigating snowy and icy terrain.
Landmarks: February is an ideal month to visit the Yale University Art Gallery in New Haven, where you can explore an impressive collection of art spanning different cultures and time periods. If you’re interested in the outdoors, head to the Connecticut River Museum in Essex, where you can learn about the state’s maritime history and enjoy scenic views of the frozen river.
March
Weather: March marks the beginning of spring in Connecticut, with average temperatures ranging from 30°F to 50°F (-1°C to 10°C). The weather is unpredictable, with the possibility of both snow and rain. As the month progresses, temperatures gradually rise, and the first signs of blooming flowers and budding trees appear.
Clothing: Layering is still important in March, as temperatures can vary widely. A medium-weight jacket, along with sweaters or long-sleeved shirts, is recommended. Waterproof boots and a raincoat or umbrella are also advisable due to the increased likelihood of rain.
Landmarks: March is a good time to visit Mystic Seaport Museum, where you can explore historic ships and maritime exhibits while enjoying the early signs of spring. The Elizabeth Park Conservancy in West Hartford is also worth a visit as the gardens begin to bloom, offering a peaceful setting for a stroll through the greenhouses and grounds.
April
Weather: April brings milder weather to Connecticut, with average temperatures ranging from 40°F to 60°F (4°C to 16°C). The state fully embraces spring, with blooming flowers, budding trees, and increasingly longer days. Rain showers are common, contributing to the lush, green landscape.
Clothing: Light layers, such as long-sleeved shirts and a light jacket, are suitable for April. Waterproof shoes and a rain jacket or umbrella are recommended to handle the frequent spring showers.
Landmarks: April is an excellent time to explore the Connecticut College Arboretum in New London, where the blooming spring flowers create a vibrant display. The Weir Farm National Historic Site in Wilton, a former artist’s retreat, offers beautiful walking trails and an opportunity to learn about the American Impressionists who once lived and worked there.
May
Weather: May sees the full arrival of spring in Connecticut, with temperatures ranging from 50°F to 70°F (10°C to 21°C). The weather is generally mild and pleasant, making it one of the best months to enjoy outdoor activities. Rain is still possible, but the days are longer and sunnier.
Clothing: Light, breathable clothing is ideal for May, such as t-shirts, light jackets, and comfortable walking shoes. A rain jacket or umbrella may still be needed for occasional showers.
Landmarks: May is a fantastic time to visit Gillette Castle State Park in East Haddam, where you can explore the unique stone castle built by actor William Gillette and enjoy hiking trails along the Connecticut River. The blooming spring flowers also make it a great time to visit the New England National Scenic Trail, which offers beautiful vistas and a variety of hiking opportunities.
June
Weather: June ushers in summer in Connecticut, with temperatures ranging from 60°F to 80°F (16°C to 27°C). The weather is warm, with increasing humidity as the month progresses. Rainfall is moderate, often in the form of afternoon showers or thunderstorms.
Clothing: Light, breathable clothing is essential in June, including shorts, t-shirts, and sandals. A hat and sunglasses are recommended for sun protection, and a light rain jacket or umbrella can be useful for sudden showers.
Landmarks: June is perfect for enjoying Connecticut’s coastal attractions, such as Hammonasset Beach State Park, where you can relax on the sand, swim, and partake in water sports. Inland, head to the Litchfield Hills, where you can explore charming small towns, scenic drives, and hiking trails that showcase the state’s natural beauty.
July
Weather: July is the hottest month in Connecticut, with temperatures ranging from 65°F to 85°F (18°C to 29°C). The weather is warm and humid, with frequent afternoon thunderstorms providing some relief from the heat. Coastal areas may enjoy cooler breezes, while inland areas can feel more intense heat.
Clothing: Wear light, breathable clothing such as shorts, tank tops, and sandals. Sunscreen, sunglasses, and a hat are essential for protection against the sun. A lightweight rain jacket may be useful for sudden thunderstorms.
Landmarks: July is ideal for exploring Connecticut’s beaches and coastal towns. Mystic Seaport and Mystic Aquarium are popular attractions, offering a mix of history, marine life, and family-friendly activities. For a more relaxed beach day, head to Silver Sands State Park in Milford, where you can enjoy sandy beaches, boardwalks, and beautiful views of Long Island Sound.
August
Weather: August in Connecticut remains warm and humid, with temperatures ranging from 63°F to 83°F (17°C to 28°C). The summer heat persists, though it may start to ease slightly towards the end of the month. Thunderstorms continue to be common in the afternoons.
Clothing: Light, airy clothing is a must for August, including shorts, t-shirts, and sandals. Sun protection is crucial, so wear sunscreen, a hat, and sunglasses. A light rain jacket or umbrella is also advisable for afternoon storms.
Landmarks: August is a great time to visit the Thimble Islands, a beautiful archipelago off the coast of Branford. Take a boat tour to explore the small islands, many of which feature charming summer cottages and lush vegetation. Inland, the Connecticut Wine Trail offers a relaxing experience with vineyards open for tastings and tours, perfect for enjoying the summer weather.
September
Weather: September brings the first hints of fall to Connecticut, with temperatures ranging from 55°F to 75°F (13°C to 24°C). The weather remains warm, with lower humidity and more comfortable temperatures, especially in the evenings. The landscape begins to show early signs of fall foliage.
Clothing: Light layers are ideal for September, with t-shirts and shorts for the warmer parts of the day and a light jacket or sweater for cooler mornings and evenings. Comfortable walking shoes are recommended for exploring outdoor areas.
Landmarks: September is the perfect time to visit the Connecticut River Valley, where you can take a scenic cruise or explore charming towns like Essex and Old Saybrook. The early fall colors make this one of the most picturesque times to explore the region. The Durham Fair, held annually in September, is Connecticut’s largest agricultural fair, offering fun for the whole family with live music, local food, and traditional fair activities.
October
Weather: October sees a significant drop in temperatures, ranging from 45°F to 65°F (7°C to 18°C). The fall foliage reaches its peak, particularly in the northern and western parts of the state. The weather can be variable, with sunny days giving way to cooler, rainy, or even frosty conditions, especially in higher elevations.
Clothing: Warmer clothing is necessary in October, including sweaters, jackets, and long pants. A heavier coat may be needed for cold days, particularly in the evenings. Waterproof footwear is recommended for wet or muddy trails.
Landmarks: October is a great time to visit Litchfield County, where the fall foliage creates a stunning landscape. The scenic drive along Route 7 is particularly beautiful, with stops at Kent Falls State Park and the historic village of Litchfield. For a unique fall experience, visit the town of Salem, known for its Halloween-themed attractions and haunted houses, offering a festive atmosphere perfect for the season.
November
Weather: November brings the onset of winter to Connecticut, with temperatures dropping to between 35°F and 55°F (2°C to 13°C). The fall foliage begins to fade, and the state starts to experience more frequent frosts and the possibility of the first snowfall of the season.
Clothing: Warm, layered clothing is essential in November, including a winter coat, gloves, and a hat. Waterproof footwear is recommended for dealing with wet or frosty conditions, especially in the mornings.
Landmarks: November marks the beginning of the holiday season in Connecticut, with towns like Greenwich and New Haven hosting festive events and holiday markets. For a cultural experience, visit the New Britain Museum of American Art, where you can explore a wide range of American artworks while staying warm indoors. The Connecticut Science Center in Hartford is another great indoor attraction, offering interactive exhibits that are fun for all ages.
December
Weather: December in Connecticut is characterized by cold temperatures and the potential for snow, especially in the northern regions. Average temperatures range from 28°F to 45°F (-2°C to 7°C). The state’s landscape often takes on a wintry appearance, with bare trees and occasional snow cover.
Clothing: Heavy winter clothing, including coats, scarves, gloves, and hats, is necessary for staying warm in December. Waterproof boots are essential for dealing with snow and slush.
Landmarks: December is the perfect time to visit Connecticut’s holiday attractions. The Festival of Silver Lights in Hubbard Park, Meriden, transforms the park into a winter wonderland with thousands of lights and festive displays. For those who enjoy historic homes, the Lockwood-Mathews Mansion Museum in Norwalk offers special holiday tours, showcasing Victorian-era decorations and holiday traditions.
