May weather forecast
Groton, CT

Weather in May

May, the last month of the spring in Groton, is a comfortable month, with an average temperature fluctuating between 50.9°F (10.5°C) and 63.3°F (17.4°C).

Temperature

In May, the average high-temperature rises from a fresh 53.4°F (11.9°C) in April to an enjoyable 63.3°F (17.4°C). In Groton, in May, the average low-temperature is 50.9°F (10.5°C).

Humidity

The average relative humidity in May in Groton is 78%.

Rainfall

In Groton, in May, it is raining for 15.6 days, with typically 2.52" (64mm) of accumulated precipitation. In Groton, during the entire year, the rain falls for 159.8 days and collects up to 33.07" (840mm) of precipitation.

Snowfall

May through October are months without snowfall in Groton.

Ocean temperature

In Groton, in May, the average water temperature is 51.8°F (11°C).
Note: Swimming in 51.8°F (11°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 May is 14h and 31min.
On the first day of the month, sunrise is at 5:45 am and sunset at 7:45 pm. On the last day of May, in Groton, Connecticut, sunrise is at 5:17 am and sunset at 8:14 pm EDT.

Sunshine

The average sunshine in May is 8.6h.

UV index

In Groton, the average daily maximum UV index in May is 5. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 5 in May 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. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in May in Groton?

In Groton, Connecticut, the average relative humidity in May is 78%.

How much does it rain in Groton in May?

In Groton, Connecticut, during May, the rain falls for 15.6 days and regularly aggregates up to 2.52" (64mm) of precipitation.

When it does not snow in Groton?

In Groton, snow does not fall in May through October.

Does it snow in Groton in May?

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

How cold is the water in May in Groton?

In May, the average ocean temperature in Groton is 51.8°F (11°C). Swimming in 51.8°F (11°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.

How many hours of daylight does Groton have in May?

In May, the average day length in Groton is 14h and 31min.

When is the sunrise / sunset in May in Groton?

In May, on the first day of the month, sunrise is at 5:45 am and sunset at 7:45 pm. On the last day of the month, sunrise is at 5:17 am and sunset at 8:14 pm EDT.

How long on average sun shines in May in Groton?

The average sunshine duration in May in Groton is 8.6h.

What is the UV index reading in May in Groton?

In May, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a moderate health threat from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Groton, CT

Average temperature in May - Groton, CT
  • Average high temperature in May: 63.3°F

The warmest month (with the highest average high temperature) is July (78.6°F).
The month with the lowest average high temperature is January (36.1°F).

  • Average low temperature in May: 50.9°F

The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (26.2°F).

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Average pressure in May
Groton, CT

Average pressure in May - Groton, CT
  • Average pressure in May: 30.01"Hg

The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in May
Groton, CT

Average wind speed in May - Groton, CT
  • Average wind speed in May: 9.1mph

The windiest month (with the highest average wind speed) is January (11.9mph).
The calmest months (with the lowest average wind speed) are July and August (7.8mph).

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Average humidity in May
Groton, CT

Average humidity in May - Groton, CT
  • Average humidity in May: 78%

The month with the highest relative humidity is June (80%).
The months with the lowest relative humidity are January, March, April and November (74%).

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Average rainfall in May
Groton, CT

Average rainfall in May - Groton, CT
  • Average rainfall in May: 2.52"

The wettest month (with the highest rainfall) is December (3.86").
The driest month (with the least rainfall) is September (1.65").

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Average rainfall days in May
Groton, CT

Average rainfall days in May - Groton, CT
  • Average rainfall days in May: 15.6 days

The month with the highest number of rainy days is July (15.8 days).
The month with the least rainy days is February (9.5 days).

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Average snowfall in May
Groton, CT

Average snowfall in May - Groton, CT
  • Average snowfall in May: 0"

The month with the highest snowfall is March (2.56").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in May
Groton, CT

Average snowfall days in May - Groton, CT
  • Average snowfall days in May: 0.1 days

The month with the highest number of snowfall days is February (6.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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Average sea temperature in May
Groton, CT

Average sea temperature in May - Groton, CT
  • Average sea temperature in May: 51.9°F

The best month for swimming (with the highest average sea temperature) is August (72.1°F).
The coldest month (with the lowest average sea temperature) is February (38.8°F).

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Average daylight in May /
Average sunshine in May
Groton, CT

Average daylight in May / Average sunshine in May - Groton, CT
  • Average daylight in May: 14h and 31min

The month with the longest days is June (Average daylight: 15h and 7min).
The month with the shortest days is December (Average daylight: 9h and 15min).

  • Average sunshine in May: 8h and 36min

The month with the most sunshine is August (Average sunshine: 10h and 36min).
The months with the least sunshine are February and December (Average sunshine: 4h and 54min).

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Average sunshine days in May
Groton, CT

Average sunshine days in May - Groton, CT
  • Average sunshine days in May: 13.4 days

The month with the most sunshine days is November (16.5 days).
The month with the least sunshine days is February (12.5 days).

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Average UV index in May
Groton, CT

Average UV index in May - Groton, CT
  • Average UV index in May: 5

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 May
Groton, CT

Average cloud cover in May - Groton, CT
  • Average cloud cover in May: 44

The months with the most cloud cover are February, March and December (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 29).

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Average visibility in May
Groton, CT

Average visibility in May - Groton, CT
  • Average visibility in May: 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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