Climate and Average Weather Year Round in Connecticut United States

We show the climate in Connecticut by comparing the average weather in 2 representative places: Hartford and New Haven.

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Connecticut, United States
New Haven
Connecticut, United States

Average High and Low Temperature in Connecticut

Average High and Low Temperature in ConnecticutJanFebMarAprMayJunJulAugSepOctNovDec10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F662184361331NowNowHartfordHartfordNew HavenNew Haven
The daily average high and low air temperature at 2 meters above the ground. The thin dotted lines are the corresponding perceived temperatures.
Hartford 36°F39°F48°F60°F71°F79°F84°F81°F74°F63°F51°F41°F
New Haven 37°F39°F47°F58°F68°F76°F81°F80°F73°F62°F52°F42°F
Hartford 22°F24°F31°F41°F51°F60°F66°F64°F56°F45°F36°F27°F
New Haven 24°F25°F32°F41°F51°F60°F66°F65°F57°F47°F38°F29°F


Average Hourly Temperature in HartfordJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNowNowfreezingfreezingvery coldvery coldcoldcoldcoolcoolwarmfreezing

New Haven

Average Hourly Temperature in New HavenJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNowNowfreezingvery coldvery coldcoldcoldcoolcoolwarmfreezingfreezing
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Chance of Clearer Skies in Connecticut

Chance of Clearer Skies in ConnecticutJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%6546NowNowHartfordHartfordNew HavenNew Haven
The percentage of time the sky is clear, mostly clear, or partly cloudy (i.e., less than 60% of the sky is covered by clouds).
Clearer SkiesJanFebMarAprMayJunJulAugSepOctNovDec
Hartford 48%47%48%48%49%53%59%62%64%61%53%48%
New Haven 49%48%49%50%50%53%59%63%64%63%55%50%

Daily Chance of Precipitation in Connecticut

Daily Chance of Precipitation in ConnecticutJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%352234NowNowHartfordHartfordNew HavenNew Haven
The percentage of days in which precipitation is observed, excluding trace quantities.
Days of Precip.JanFebMarAprMayJunJulAugSepOctNovDec
Hartford 7.4d6.9d8.1d8.4d9.9d10.1d10.3d9.3d8.0d7.8d7.6d8.2d
New Haven 7.4d7.0d8.3d8.4d9.5d9.4d9.9d9.0d7.8d7.7d7.7d8.4d

Average Monthly Rainfall in Connecticut

Average Monthly Rainfall in ConnecticutJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in3. HavenNew Haven
The average rainfall accumulated over the course of a sliding 31-day period centered on the day in question.
Hartford 1.8″2.0″3.0″3.6″3.4″3.5″3.2″3.4″3.5″3.7″3.4″2.7″
New Haven 2.2″2.3″3.2″3.7″3.5″3.4″3.0″3.4″3.5″3.7″3.5″3.0″

Average Monthly Snowfall in Connecticut

Average Monthly Snowfall in ConnecticutJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 in10.67.8NowNowHartfordHartfordNew HavenNew Haven
The average snowfall accumulated over the course of a sliding 31-day period centered on the day in question.
Hartford 10.1″9.3″4.7″0.6″0.0″0.0″0.0″0.0″0.0″0.2″1.7″7.0″
New Haven 7.5″7.3″3.8″0.4″0.0″0.0″0.0″0.0″0.0″0.1″0.9″5.0″

Hours of Daylight in Connecticut

Hours of Daylight in ConnecticutJanFebMarAprMayJunJulAugSepOctNovDec4 hr4 hr6 hr6 hr8 hr8 hr10 hr10 hr12 hr12 hr14 hr14 hr16 hr16 hr18 hr18 hr20 hr20 hr15.29.1NowNowHartfordHartfordNew HavenNew Haven
The number of hours during which the Sun is at least partly above the horizon.
Hartford 9.5h10.6h12.0h13.4h14.6h15.2h14.8h13.8h12.4h11.0h9.8h9.2h
New Haven 9.6h10.6h12.0h13.4h14.5h15.1h14.8h13.8h12.4h11.1h9.9h9.2h

Chance of Muggy Conditions in Connecticut

Chance of Muggy Conditions in ConnecticutJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%4653NowNowHartfordHartfordNew HavenNew Haven
The percentage of time that is muggy, oppressive, or miserable (i.e., a dew point greater than 65°F).
Muggy daysJanFebMarAprMayJunJulAugSepOctNovDec
Hartford 0.0d0.0d0.0d0.0d0.9d5.7d12.6d10.8d4.5d0.7d0.0d0.0d
New Haven 0.0d0.0d0.0d0.0d0.7d6.0d14.4d13.0d5.8d1.0d0.0d0.0d

Average Wind Speed in Connecticut

Average Wind Speed in ConnecticutJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph1 mph1 mph2 mph2 mph3 mph3 mph4 mph4 mph5 mph5 mph6 mph6 mph7 mph7 mph8 mph8 mph9 mph9 mph6. HavenNew Haven
The average of mean hourly wind speeds at 10 meters above the ground.
Wind Speed (mph)JanFebMarAprMayJunJulAugSepOctNovDec
New Haven

Average Water Temperature in Connecticut

Average Water Temperature in ConnecticutJanFebMarAprMayJunJulAugSepOctNovDec35°F35°F40°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F7137NowNowHartfordHartfordNew HavenNew Haven
The daily average wide-area surface water temperature.
Water Temp.JanFebMarAprMayJunJulAugSepOctNovDec
Hartford 40°F37°F38°F44°F52°F62°F69°F71°F68°F63°F54°F47°F
New Haven 40°F37°F38°F44°F53°F62°F69°F71°F69°F63°F55°F47°F

Tourism Score in Connecticut

Tourism Score in ConnecticutJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.70.1NowNowHartfordHartfordNew HavenNew Haven
The tourism score, which favors clear, rainless days with perceived temperatures between 65°F and 80°F.

Beach/Pool Score in Connecticut

Beach/Pool Score in ConnecticutJanFebMarAprMayJunJulAugSepOctNovDec002244668810105.7NowNowHartfordHartfordNew HavenNew Haven
The beach/pool score, which favors clear, rainless days with perceived temperatures between 75°F and 90°F.

Growing Season in Connecticut

Growing Season in ConnecticutJanFebMarAprMayJunJulAugSepOctNovDec0%0%20%20%40%40%60%60%80%80%100%100%NowNowHartfordHartfordNew HavenNew Haven
The percentage chance that a given day is within the growing season, defined as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

Growing Degree Days in Connecticut

Growing Degree Days in ConnecticutJanFebMarAprMayJunJulAugSepOctNovDec500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°F3,000°F3,000°F3,500°F3,500°FNowNowHartfordHartfordNew HavenNew Haven
The average growing degree days accumulated over the course of the year, where growing degree days are defined as the integral of warmth above a base temperature (50°F in this case).

Average Daily Incident Shortwave Solar Energy in Connecticut

Average Daily Incident Shortwave Solar Energy in ConnecticutJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh6.91.7NowNowHartfordHartfordNew HavenNew Haven
The average daily shortwave solar energy reaching the ground per square meter.
Solar Energy (kWh)JanFebMarAprMayJunJulAugSepOctNovDec
New Haven

This report illustrates the typical weather for Hartford and New Haven year round, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

The details of the data sources used on this page vary between places and are discussed in detail on each place's dedicated page:


The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

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