Climate and monthly weather forecast
New Haven, CT

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The greeny New Haven Green in Connecticut, with the rest of the city and a far away dramatic landscape
The greeny New Haven Green in Connecticut, with the rest of the city and a far away dramatic landscape

The climate of New Haven

New Haven, Connecticut, is characterized by a humid subtropical climate. Categorization under the Köppen climate classification designates a continuous presence of moisture, with no distinct dry season. This geographical positioning bestows upon New Haven a wide range of weather experiences across the seasonal spectrum.

Throughout the year, the city witnesses noticeable fluctuations in climatological parameters. Temperature oscillations occur, ranging from the chilliest lows of 25.5°F (-3.6°C) in January, to sweltering peaks of 80.4°F (26.9°C) in July. These oscillations extend over to humidity levels, although less characterized, they hover around mid-70 figures across the year. Rainfall varies to a certain degree from February and November as drier periods with 2.4in, upward, reaching a climax in December with 3.86in. Conjoined to this, the amount of rainfall days ranges from as low as 9.4 days in January to a maximum of 18 days in July.

The prevalence of unique weather patterns is most pronounced in snowfall; January and February see the most snow accumulation with 2.13in and 2.68in respectively, snowfall substantially declines afterwards, with virtually none from May to November. Sea temperatures, influenced by the overall weather trend, start from lows of 38.5°F (3.6°C) in February, before peaking at 73°F (22.8°C) in August.

The best time to visit New Haven

The ideal conditions conducive for a visit to New Haven are undoubtedly between May and October. During this period, the city basks in moderate temperatures which fluctuate from 65.1°F (18.4°C) to a comfortable 80.4°F (26.9°C). The sea temperature during this period is also invitingly warm, reaching a peak of 73°F (22.8°C) in August. Besides, visitors will be able to enjoy longer daylight hours, which peak at 15.1h in June. Moreover, the sunshine hours are also the highest between these months, indicating fewer occurrences of cloudy conditions. Nevertheless, it is noteworthy that although July holds the record for the highest average temperatures, it also records the most rain-heavy days.

The worst time to visit New Haven

The least favorable period to visit New Haven extends from late November to early March. Cold temperatures predominate this timeframe, with lows plunging to 25.5°F (-3.6°C) in January and barely rising beyond 43.9°F (6.6°C) in March. Snowfall during these months is experienced quite frequently with January leading with 6.1 snow days on average. Sea temperatures during this period are cold, dropping to a chilly 38.5°F (3.6°C) in February. Days are also shorter, with the least daily sunlight hours occurring in December, lasting for just 9.2h.

Spring weather in New Haven

Spring in New Haven is characterized by a progressive warming trend. Temperatures begin to climb from an average low of 25.5°F (-3.6°C) in March to a pleasant high of 65.1°F (18.4°C) by May. April marks the departure from snowfall, with a meager 0.08in recorded. Rainfall also takes an upward swing, going from 2.8in in March, culminating in a slightly wetter May with 2.76in. Daylight increases significantly during this period, adding approximately two minutes per day from March to May, resulting in a daylight peak of 14.5h.

Summer weather in New Haven

Summer provides New Haven with its warmest conditions. The months from June to August register high temperatures, with July being the hottest month boasting an average peak of 80.4°F (26.9°C). Rainfall during the summer months is fairly consistent, with a slight increase registered in July at 3.43in. Sea temperatures are at their most enticing from June to August, easily reaching a high of 73°F (22.8°C) in August. The summer season also graces New Haven with abundant sunshine, having as high as 15.1 sunshine hours per day in June.

Autumn weather in New Haven

During Autumn, New Haven experiences a gradual cooling pattern. September sees average highs of 72.5°F (22.5°C), which decrease to an average high of 50.7°F (10.4°C) by November. This period also registers moderate to high rainfall, with the peak recorded at 3.54in in October. However, it is notable that in terms of daylight and sunshine hours, Autumn still holds appealing conditions with around 11 sunshine hours per day in September.

Winter weather in New Haven

Winter ushers in the coldest period for New Haven, characterized by a significant drop in temperatures. From December to February, temperatures plummet, from a high of 41.7°F (5.4°C) in December, dropping to an average low of 26.6°F (-3°C) in February. Cold sea temperatures accompany the winter chill, sinking to 38.5°F (3.6°C) in February. Snow becomes a prevalent feature of the weather scenery in December through February, with January having the highest snowfall at 2.13in. Remarkably, despite the cold conditions, winter in New Haven possesses moderate sunshine hours with 4.8h per day in December, indicating fewer cloudy days.

Weather in January

During January, New Haven experiences cold winter days, typified by the blanket of snow decorating the city with an average of 2.13" (54mm) of snowfall. Marked by a drop in temperature from the relaxing autumn climate, the chill in the air is heightened by the wind, making it slightly cooler yet crisp. Weather in January »

Weather in February

Transitioning from January, the nip in the air persists, and New Haven witnesses its last snow of the winter. The snowfall inches up to 2.68" (68mm) and adds to the winter holiday charm. The bitter cold of January sees some respite. Weather in February »

Weather in March

As New Haven moves into March, the weather shows signs of gradual warming. Compared to the prior month, March is warmer with an appreciable increase in daylight hours, indicating towards the approach of spring season. Scarce snowfalls are replaced by rainfall as the primary form of precipitation, making the city gleam anew. Weather in March »

Weather in April

April brings significant transformations in New Haven's weather. It is devoid of snowfall with the temperature rising to a pleasant range. The cold, biting winter is becoming a memory with the emergence of sprouting buds and blossoming landscapes. Weather in April »

Weather in May

New Haven in May showcases a splendid weather transformation, stepping confidently into the warm, sunny days of late spring. The city says goodbye to April’s capricious climate, firmly embracing the utilitarian weather of May, ideal for outdoor activities. Weather in May »

Weather in June

June is the harbinger of summer season in New Haven with comfortable, warm temperatures gracing the city. It holds a significant increase in temperature, confirming the departure of the cool spring season. The daylight stretches out the most during this time, allowing ample sunshine to light up the city. Weather in June »

Weather in July

July in New Haven marks the peak of summer, providing the highest average temperature of 80.4°F (26.9°C) and enjoying 15.1 hours of daylight. The city basks under the golden summer sun, bringing an air of laziness affecting both the locals and the visitors. Weather in July »

Weather in August

August follows the trail of July's heated footsteps, but with a slight reduction in temperature. It's a serene time in New Haven when nature comes alive under the warm summer sun. Rainfall is intermittent, just enough to enhance the intense greenery of the city parks. Weather in August »

Weather in September

September weather in New Haven brings a sense of transformation, triggering the advent of the autumnal breeze. Though it follows August's cue of warm days, the fall season paints the city with hues of cranberry red, pumpkin orange, and gilded gold. Weather in September »

Weather in October

October in New Haven is the heart of the beautiful autumn season and the notable drop in temperature from the previous month starts setting in with characteristic chilly mornings and evenings. With the amber leaves decorating every street, the city encapsulates the essence of the fall season. Weather in October »

Weather in November

November marks the transition from autumn to the early winter season in New Haven. Taking a turn from the mild weather of October, November introduces a crisp coldness that remains till the year-end. However, the luminous fall foliage against the clear, dark blue sky creates a picturesque sight, making it equally attractive. Weather in November »

Weather in December

December welcomes the onset of winter in New Haven, Connecticut, USA, demonstrating temperatures as low as 32.5°F (0.3°C). Evenings turn cold earlier, marking the arrival of long winter nights. Despite its chilly attributes, locals enjoy the festivity brought in by the Christmas season. Weather in December »
Updated: Feb 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the coldest months in New Haven?

In New Haven, January is the coldest month, with temperatures averaging a high of 35.1°F (1.7°C) and a low of 25.5°F (-3.6°C).

How many days does it rain in New Haven?

Throughout the year, in New Haven, Connecticut, there are 167.2 rainfall days, and 35.71" (907mm) of precipitation is accumulated.

When does it snow in New Haven?

January through April, November and December are months with snowfall in New Haven, Connecticut.

How many days does it snow in New Haven?

In New Haven, during the entire year, snow falls for 23.1 days and aggregates up to 9.21" (234mm) of snow.

When is the lowest UV index in New Haven?

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the most humid month in New Haven?

The months with the highest humidity are February, May and June, with an average relative humidity of 76%.

What month is the ocean coldest in New Haven?

With an average ocean temperature of 38.5°F (3.6°C), February is the month with the coldest seawater in New Haven.

What is the month with the least sunshine in New Haven?

With an average of 4.7h of sunshine, February has the least sunshine of the year in New Haven.

What is the snowiest month in New Haven?

March is the month with the most snowfall. Snow falls for 4.8 days and accumulates 2.8" (71mm) of snow.

When is Daylight Saving Time (DST) in New Haven?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.

What is the least humid month in New Haven?

April and November, with an average relative humidity of 72%, are the least humid months in New Haven, Connecticut.

When it does not snow in New Haven?

In New Haven, snow does not fall in May through October.

When are the longest days in New Haven?

With an average of 15h and 6min of daylight, June has the longest days of the year.

What is the month with the highest UV index in New Haven?

The months with the highest UV index in New Haven, Connecticut, are June through August, with an average maximum UV index of 6.

What is the hottest time of year in New Haven?

The warmest temperatures occur during July, when averages reach a peak of 80.4°F (26.9°C) and a low of 67.6°F (19.8°C).

What month has the most sunshine in New Haven?

With an average of 10.6h of sunshine, July has the most sunshine of the year in New Haven, Connecticut.

When is the ocean warmest in New Haven?

With an average ocean temperature of 73°F (22.8°C), August is the month with the warmest seawater.

What is the driest month in New Haven?

September is the month with the least rainfall in New Haven, Connecticut. Rain falls for 13.4 days and accumulates 2.24" (57mm) of precipitation.

What is the rainiest month in New Haven?

The month with the most rainfall in New Haven, Connecticut, is December, when the rain falls for 12.5 days and typically aggregates up to 3.86" (98mm) of precipitation.

What is the month with the shortest days in New Haven?

December has the shortest days of the year, with an average of 9h and 18min of daylight.
Today
Tomorrow
Long-term
YearJFMAMJJASOND

Average temperature
New Haven, CT

Average temperature - New Haven, CT

The warmest month (with the highest average high temperature) is July (80.4°F).
The month with the lowest average high temperature is January (35.1°F).

The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (25.5°F).

Average pressure
New Haven, CT

Average pressure - New Haven, CT

The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed
New Haven, CT

Average wind speed - New Haven, CT

The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).

Average humidity
New Haven, CT

Average humidity - New Haven, CT

The months with the highest relative humidity are February, May and June (76%).
The months with the lowest relative humidity are April and November (72%).

Average rainfall
New Haven, CT

Average rainfall - New Haven, CT

The wettest month (with the highest rainfall) is December (3.86").
The driest month (with the least rainfall) is September (2.24").

Average rainfall days
New Haven, CT

Average rainfall days - New Haven, CT

The month with the highest number of rainy days is July (18 days).
The month with the least rainy days is January (9.4 days).

Average snowfall
New Haven, CT

Average snowfall - New Haven, CT

The month with the highest snowfall is March (2.8").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days
New Haven, CT

Average snowfall days - New Haven, CT

The month with the highest number of snowfall days is February (7.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average sea temperature
New Haven, CT

Average sea temperature - New Haven, CT

The best month for swimming (with the highest average sea temperature) is August (73°F).
The coldest month (with the lowest average sea temperature) is February (38.5°F).

Average daylight / Average sunshine
New Haven, CT

Average daylight / Average sunshine - New Haven, CT

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

Average sunshine days
New Haven, CT

Average sunshine days - New Haven, CT

The month with the most sunshine days is November (17.3 days).
The month with the least sunshine days is August (11.3 days).

Average UV index
New Haven, CT

Average UV index - New Haven, CT

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

Average cloud cover
New Haven, CT

Average cloud cover - New Haven, CT

The months with the most cloud cover are February and December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 29).

Average visibility
New Haven, CT

Average visibility - New Haven, CT

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

New Haven, Connecticut, USA

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