May weather forecast
Old Greenwich, CT

Weather in May

May, the last month of the spring, in Old Greenwich, is an enjoyable month, with average temperature fluctuating between 53.2°F (11.8°C) and 65.8°F (18.8°C).

Temperature

In May, the average high-temperature increases, from a moderate 55.4°F (13°C) in April, to a comfortable 65.8°F (18.8°C). In Old Greenwich, the average low-temperature is 53.2°F (11.8°C).

Humidity

February, May, June and December, with an average relative humidity of 75%, are most humid months.

Rainfall

In Old Greenwich, during May, the rain falls for 17.4 days and regularly aggregates up to 3.11" (79mm) of precipitation. Throughout the year, there are 166.6 rainfall days, and 38.07" (967mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall in Old Greenwich.

Ocean temperature

In Old Greenwich, the average seawater temperature is 51.4°F (10.8°C).
Note: Swimming in 51.4°F (10.8°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

The average length of the day in Old Greenwich is 14.5h.

Sunshine

In Old Greenwich, the average sunshine in May is 8.7h.

UV index

In May, the average daily maximum UV index in Old Greenwich is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from the exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 5 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the most humid month in Old Greenwich?

Months with the highest humidity are February, May, June and December, with an average relative humidity of 75%.

What is the average humidity in May in Old Greenwich?

The average relative humidity in May is 75%.

How much does it rain in Old Greenwich in May?

In May, in Old Greenwich, Connecticut, the rain falls for 17.4 days. Throughout May, 3.11" (79mm) of precipitation is accumulated.

When it does not snow in Old Greenwich?

In Old Greenwich, Connecticut, snow does not fall in May through October.

Does it snow in Old Greenwich in May?

In May, in Old Greenwich, it doesn't snow. April is the latest month when it typically snows.

What is the water temperature in May in Old Greenwich?

In Old Greenwich, in May, the average water temperature is 51.4°F (10.8°C). Swimming in 51.4°F (10.8°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

What is the average length of the day in May in Old Greenwich?

In May, the average length of the day is 14.5h.

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

In Old Greenwich, Connecticut, the average sunshine in May is 8.7h.

What is the UV index reading in May in Old Greenwich?

In Old Greenwich, Connecticut, the average daily maximum UV index in May is 5. A UV Index reading of 3 to 5 represents a medium health risk from unsafe exposure to the Sun's UV rays.

Average temperature in May
Old Greenwich, CT

Average temperature in May - Old Greenwich, CT
  • Average high temperature in May: 65.8°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 May: 53.2°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 May
Old Greenwich, CT

Average pressure in May - Old Greenwich, CT
  • Average pressure in May: 30.01"

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

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Average wind speed in May
Old Greenwich, CT

Average wind speed in May - Old Greenwich, CT
  • Average wind speed in May: 7.6mph

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 May
Old Greenwich, CT

Average humidity in May - Old Greenwich, CT
  • Average humidity in May: 75%

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 May
Old Greenwich, CT

Average rainfall in May - Old Greenwich, CT
  • Average rainfall in May: 3.11"

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 May
Old Greenwich, CT

Average rainfall days in May - Old Greenwich, CT
  • Average rainfall days in May: 17.4 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 May
Old Greenwich, CT

Average snowfall in May - Old Greenwich, CT
  • Average snowfall in May: 0"

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

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Average snowfall days in May
Old Greenwich, CT

Average snowfall days in May - Old Greenwich, CT
  • Average snowfall days in May: 0 days

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

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Average sea temperature in May
Old Greenwich, CT

Average sea temperature in May - Old Greenwich, CT
  • Average sea temperature in May: 51.4°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 May /
Average sunshine in May
Old Greenwich, CT

Average daylight in May / Average sunshine in May - Old Greenwich, CT
  • Average daylight in May: 14.5h

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in May: 8.7h

The month with the most sunshine is July (Average sunshine: 10.5h).
Months with the least sunshine are February and December (Average sunshine: 4.7).

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Average sunshine days in May
Old Greenwich, CT

Average sunshine days in May - Old Greenwich, CT
  • Average sunshine days in May: 11.7 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 May
Old Greenwich, CT

Average UV index in May - Old Greenwich, CT
  • Average UV index in May: 5

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

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Average cloud cover in May
Old Greenwich, CT

Average cloud cover in May - Old Greenwich, CT
  • Average cloud cover in May: 44

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 May
Old Greenwich, CT

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

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

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