October weather forecast
Groton, CT

Weather in October

October, like September, in Groton, Connecticut, is another comfortable autumn month, with temperature in the range of an average low of 50.9°F (10.5°C) and an average high of 61.7°F (16.5°C).

Temperature

In October, the average high-temperature decreases from a pleasant 72°F (22.2°C) in September to a comfortable 61.7°F (16.5°C). The average low-temperature, in October, is 50.9°F (10.5°C).

Humidity

In Groton, the average relative humidity in October is 76%.

Rainfall

In Groton, Connecticut, during October, the rain falls for 14.5 days and regularly aggregates up to 3.39" (86mm) of precipitation. Throughout the year, there are 159.8 rainfall days, and 33.07" (840mm) of precipitation is accumulated.

Snowfall

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

Ocean temperature

In October, the average ocean temperature is 62.8°F (17.1°C).
Note: For swimming, a surface water temperature of 62.8°F (17.1°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

Daylight

In Groton, the average length of the day in October is 11h and 5min.
On the first day of the month, sunrise is at 6:45 am and sunset at 6:30 pm. On the last day of October, sunrise is at 7:18 am and sunset at 5:45 pm EDT.

Sunshine

In October, the average sunshine is 6.2h.

UV index

The average daily maximum UV index in October is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: In October, the average maximum UV index of 3 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the average humidity in October in Groton?

In October, the average relative humidity in Groton is 76%.

How many days does it rain in October in Groton?

In October, the rain falls for 14.5 days. Throughout October, 3.39" (86mm) of precipitation is accumulated.

When it does not snow in Groton?

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

Does it snow in Groton in October?

In Groton, in October, it doesn't snow. In November, it regularly snows.

How cold is the water in October in Groton?

In Groton, in October, the average water temperature is 62.8°F (17.1°C). For swimming, a surface water temperature of 62.8°F (17.1°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

What is the average length of the day in October in Groton?

In Groton, Connecticut, the average day length in October is 11h and 5min.

When is the sunrise / sunset in October in Groton?

In October, on the first day of the month, sunrise is at 6:45 am and sunset at 6:30 pm. On the last day of the month, in Groton, sunrise is at 7:18 am and sunset at 5:45 pm EDT.

How long on average sun shines in October in Groton?

The average sunshine duration in October is 6.2h.

What is the UV index reading in October in Groton?

In October, the average daily maximum UV index in Groton is 3. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unsafe exposure to Sun's UV rays.
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 October
Groton, CT

Average temperature in October - Groton, CT
  • Average high temperature in October: 61.7°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 October: 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 October
Groton, CT

Average pressure in October - Groton, CT
  • Average pressure in October: 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 October
Groton, CT

Average wind speed in October - Groton, CT
  • Average wind speed in October: 10.4mph

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 October
Groton, CT

Average humidity in October - Groton, CT
  • Average humidity in October: 76%

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 October
Groton, CT

Average rainfall in October - Groton, CT
  • Average rainfall in October: 3.39"

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 October
Groton, CT

Average rainfall days in October - Groton, CT
  • Average rainfall days in October: 14.5 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 October
Groton, CT

Average snowfall in October - Groton, CT
  • Average snowfall in October: 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 October
Groton, CT

Average snowfall days in October - Groton, CT
  • Average snowfall days in October: 0 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 October
Groton, CT

Average sea temperature in October - Groton, CT
  • Average sea temperature in October: 62.8°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 October /
Average sunshine in October
Groton, CT

Average daylight in October / Average sunshine in October - Groton, CT
  • Average daylight in October: 11h and 5min

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 October: 6h and 12min

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 October
Groton, CT

Average sunshine days in October - Groton, CT
  • Average sunshine days in October: 14.5 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 October
Groton, CT

Average UV index in October - Groton, CT
  • Average UV index in October: 3

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 October
Groton, CT

Average cloud cover in October - Groton, CT
  • Average cloud cover in October: 40

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 October
Groton, CT

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