March weather forecast
Old Greenwich, CT

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Weather in March

As Old Greenwich moves into March, the air becomes crisper, and the days longer. The intensity of the sun's rays increases, resulting in slightly higher temperatures. The winter snow reduces gradually by this time, yet occasional flurries are not uncommon. An interesting fact about the weather in this month is the noticeable increase in rainfall to 2.95" (75mm), indicating the gradual transition from winter to spring. Given the varying conditions, it is advisable for residents and visitors to adjust their wardrobes and plans according to the changing weather.

Temperature

March's onset is marked by a subtle temperature increase, moving from a cold 38.5°F (3.6°C) in February to a frosty 45°F (7.2°C). The nighttime temperature in Old Greenwich, during March, averages of 34.2°F (1.2°C).

Humidity

In Old Greenwich, the average relative humidity in March is 72%.

Rainfall

In Old Greenwich, in March, during 13.2 rainfall days, 2.95" (75mm) of precipitation is typically accumulated. In Old Greenwich, during the entire year, the rain falls for 166.6 days and collects up to 38.07" (967mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall. In Old Greenwich, in March, during 4.6 snowfall days, 2.56" (65mm) of snow is typically accumulated. Throughout the year, in Old Greenwich, there are 24.8 snowfall days, and 9.33" (237mm) of snow is accumulated.

Ocean temperature

In March, the average ocean temperature in Old Greenwich, Connecticut, is 39.7°F (4.3°C).
Note: During swimming events, this situation presents an imminent life risk. Instantaneous loss of breath control makes clear thinking a near impossibility. A specialized swimsuit is compulsory to limit thermal dissipation.

Daylight

The average length of the day in March in Old Greenwich is 11h and 58min.
On the first day of March in Old Greenwich, sunrise is at 6:27 am and sunset at 5:45 pm EST. On the last day of the month, sunrise is at 6:37 am and sunset at 7:18 pm EDT.
Note: 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 lasts until Sunday, November 3. 2024, at 2:00 am; consequently, the time zone reverts from EDT to EST.

Sunshine

In March, the average sunshine is 6.2h.

UV index

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Old Greenwich. A UV Index value of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for the average person.
Note: In March, the maximum UV index of 2 translates into these guidelines:
Those with sensitive skin, infants, and children require constant safeguarding from prolonged sun exposure. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
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Frequently asked questions

What is the usual temperature for Old Greenwich in March?

The high-temperature, in March, in Old Greenwich, is 45°F (7.2°C), while the low-temperature averages to 34.2°F (1.2°C).

What is the average humidity in March in Old Greenwich?

The average relative humidity in March in Old Greenwich, Connecticut, is 72%.

How many days does it rain in March in Old Greenwich?

In Old Greenwich, Connecticut, in March, it is raining for 13.2 days, with typically 2.95" (75mm) of accumulated precipitation.

How many days does it snow in March in Old Greenwich?

In Old Greenwich, during March, snow falls for 4.6 days and regularly aggregates up to 2.56" (65mm) of snow.

What is the ocean temperature in March in Old Greenwich?

In Old Greenwich, Connecticut, the average seawater temperature in March is 39.7°F (4.3°C). For swimming, this is considered life-threatening and very dangerous. The water feels painfully cold, and hyperventilation quickly occurs. A specialized swimsuit is mandatory to reduce thermal damage.

How many hours of daylight does Old Greenwich have in March?

In March, the average day length in Old Greenwich, Connecticut, is 11h and 58min.

What time are sunrise and sunset in March in Old Greenwich?

In March, on the first day of the month, sunrise is at 6:27 am and sunset at 5:45 pm EST. On the last day of the month, in Old Greenwich, sunrise is at 6:37 am and sunset at 7:18 pm EDT.

When does Daylight Saving Time (DST) start in March in Old Greenwich?

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

How long on average sun shines in March in Old Greenwich?

In March, the average sunshine duration is 6.2h.

What is the month with the lowest UV index in Old Greenwich?

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

What is the UV index intensity in March in Old Greenwich?

In Old Greenwich, the average daily maximum UV index in March is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in March
Old Greenwich, CT

Average temperature in March - Old Greenwich, CT
  • Average high temperature in March: 45°F

The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (36°F).

  • Average low temperature in March: 34.2°F

The month with the highest average low temperature is July (69.3°F).
The coldest month (with the lowest average low temperature) is January (26.2°F).

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Average pressure in March
Old Greenwich, CT

Average pressure in March - Old Greenwich, CT
  • Average pressure in March: 30.05"Hg

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

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Average wind speed in March
Old Greenwich, CT

Average wind speed in March - Old Greenwich, CT
  • Average wind speed in March: 9.8mph

The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.6mph).

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Average humidity in March
Old Greenwich, CT

Average humidity in March - Old Greenwich, CT
  • Average humidity in March: 72%

The months with the highest relative humidity are February, May, June and December (75%).
The month with the lowest relative humidity is August (71%).

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Average rainfall in March
Old Greenwich, CT

Average rainfall in March - Old Greenwich, CT
  • Average rainfall in March: 2.95"

The wettest month (with the highest rainfall) is July (4.13").
The driest month (with the least rainfall) is January (2.44").

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Average rainfall days in March
Old Greenwich, CT

Average rainfall days in March - Old Greenwich, CT
  • Average rainfall days in March: 13.2 days

The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is January (8.6 days).

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Average snowfall in March
Old Greenwich, CT

Average snowfall in March - Old Greenwich, CT
  • Average snowfall in March: 2.56"

The month with the highest snowfall is February (2.6").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in March
Old Greenwich, CT

Average snowfall days in March - Old Greenwich, CT
  • Average snowfall days in March: 4.6 days

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

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Average sea temperature in March
Old Greenwich, CT

Average sea temperature in March - Old Greenwich, CT
  • Average sea temperature in March: 39.7°F

The best month for swimming (with the highest average sea temperature) is August (73.1°F).
The coldest month (with the lowest average sea temperature) is February (39.5°F).

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Average daylight in March /
Average sunshine in March
Old Greenwich, CT

Average daylight in March / Average sunshine in March - Old Greenwich, CT
  • Average daylight in March: 12h and 0min

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).

  • Average sunshine in March: 6h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The months with the least sunshine are February and December (Average sunshine: 4h and 42min).

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Average sunshine days in March
Old Greenwich, CT

Average sunshine days in March - Old Greenwich, CT
  • Average sunshine days in March: 13.6 days

The month with the most sunshine days is November (17.9 days).
The month with the least sunshine days is June (11.1 days).

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Average UV index in March
Old Greenwich, CT

Average UV index in March - Old Greenwich, CT
  • Average UV index in March: 2

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).

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Average cloud cover in March
Old Greenwich, CT

Average cloud cover in March - Old Greenwich, CT
  • Average cloud cover in March: 48

The month with the most cloud cover is December (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 31).

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Average visibility in March
Old Greenwich, CT

Average visibility in March - Old Greenwich, CT
  • Average visibility in March: 6mi

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).

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Old Greenwich, Connecticut, USA

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