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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, like December, is a freezing cold winter month in Groton, Massachusetts, with temperature in the range of an average low of 19.4°F (-7°C) and an average high of 31.3°F (-0.4°C). The month of January sees the lowest average temperatures, reaching 31.3°F (-0.4°C) at the peak and 19.4°F (-7°C) at the low. Weather in January »
Weather in February
February, the last month of the winter in Groton, is a cold month, with an average temperature fluctuating between 34.7°F (1.5°C) and 19.9°F (-6.7°C). A minor adjustment in Groton's average high-temperature is noted with the start of February, touching a cold 34.7°F (1.5°C) from January's 31.3°F (-0.4°C). Weather in February »
Weather in March
March, the first month of the spring in Groton, is also an icy month, with temperature in the range of an average high of 42.3°F (5.7°C) and an average low of 27.5°F (-2.5°C). March's arrival coincides with a subtle temperature rise, moving from February's 34.7°F (1.5°C) to a still wintry 42.3°F (5.7°C). Weather in March »
Weather in April
April in Groton, Massachusetts, is a mild spring month, with an average temperature fluctuating between 38.1°F (3.4°C) and 55.6°F (13.1°C). As March transitions into April, a change in temperatures is observed, with average highs moving from a cold 42.3°F (5.7°C) to a mild 55.6°F (13.1°C). Weather in April »
Weather in May
The last month of the spring, May, is a comfortable month in Groton, Massachusetts, with an average temperature varying between 47.8°F (8.8°C) and 67.6°F (19.8°C). Groton's weather shows a temperature rise with the arrival of May, moving from a mild 55.6°F (13.1°C) in April to a comfortable 67.6°F (19.8°C). Weather in May »
Weather in June
The first month of the summer, June, is a warm month in Groton, Massachusetts, with an average temperature varying between 55.6°F (13.1°C) and 75.4°F (24.1°C). June sees a marginal temperature increase, moving from a refreshing 67.6°F (19.8°C) in May to a warm 75.4°F (24.1°C). Weather in June »
Weather in July
July, like June, in Groton, Massachusetts, is a moderately hot summer month, with an average temperature varying between 82°F (27.8°C) and 62.2°F (16.8°C). The warmest time of the year is July, with temperatures averaging a high of 82°F (27.8°C) and a low of 62.2°F (16.8°C). The heat index value for July is estimated at a hot 87.8°F (31°C). Weather in July »
Weather in August
The last month of the summer, August, is another warm month in Groton, Massachusetts, with an average temperature ranging between min 60.4°F (15.8°C) and max 80.2°F (26.8°C). In August, Groton experiences a minor shift in meteorological conditions with average high-temperatures marked at a still moderately hot 80.2°F (26.8°C), closely mirroring the climate in July. Weather in August »
Weather in September
The first month of the autumn, September, is still a pleasant month in Groton, Massachusetts, with an average temperature fluctuating between 72.7°F (22.6°C) and 54°F (12.2°C). In the transition to September, Groton observes a minor drop in the average high-temperature, shifting from a moderately hot 80.2°F (26.8°C) in August to a pleasant 72.7°F (22.6°C). Weather in September »
Weather in October
October, like September, is a moderate autumn month in Groton, Massachusetts, with an average temperature ranging between max 59.9°F (15.5°C) and min 44.6°F (7°C). Groton experiences a temperature shift at the start of October, with average high-temperatures adjusting from an agreeable 72.7°F (22.6°C) in September to a mild 59.9°F (15.5°C). Weather in October »
Weather in November
November, the last month of the autumn in Groton, is also a frosty month, with temperature in the range of an average low of 34.3°F (1.3°C) and an average high of 47.3°F (8.5°C). November's arrival correlates with a reduction in the average high-temperature, down from a mild 59.9°F (15.5°C) in October to a frosty 47.3°F (8.5°C). Weather in November »
Weather in December
The first month of the winter, December, is also a wintry month in Groton, Massachusetts, with temperature in the range of an average high of 37.4°F (3°C) and an average low of 26.2°F (-3.2°C). As November transitions to December, the average high-temperature falls from a chilly 47.3°F (8.5°C) to a cold 37.4°F (3°C). Weather in December »
[Resources]Frequently asked questions
What is the coldest month in Groton?
In Groton, January is known for its average lowest temperatures, reaching a high of 31.3°F (-0.4°C) and a low of 19.4°F (-7°C).
How much does it rain in Groton?
Throughout the year, in Groton, Massachusetts, there are 142.2 rainfall days, and 26.97" (685mm) of precipitation is accumulated.
When does it snow in Groton?
Months with snowfall in Groton are January through May, October through December.
How many days does it snow in Groton?
In Groton, Massachusetts, during the entire year, snow falls for 32.6 days and aggregates up to 22.99" (584mm) of snow.
What is the month with the lowest UV index in Groton?
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2.
What is the most humid month in Groton?
The most humid month in Groton is February, with an average relative humidity of 81%.
When does it snow the most in Groton?
The month with the most snowfall is February, when snow falls for 7.8 days and typically aggregates up to 6.3" (160mm) of snow.
What is the month with the least sunshine in Groton?
The month with the least sunshine in Groton, Massachusetts, is February, with an average of 4.6h of sunshine.
When is Daylight Saving Time (DST) in Groton?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Groton, 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 Groton?
April is the least humid month in Groton, with an average relative humidity of 71%.
When it does not snow in Groton?
June through September are months without snowfall in Groton, Massachusetts.
When are the longest days in Groton?
The month with the longest days in Groton is June, with an average of 15h and 18min of daylight.
When is the highest UV index in Groton?
The months with the highest UV index are June through August, with an average maximum UV index of 6.
What month is the hottest in Groton?
In Groton, Massachusetts, the peak temperatures are generally noted in July, averaging a high of 82°F (27.8°C) and a low of 62.2°F (16.8°C).
What month has the most sunshine in Groton?
The month with the most sunshine is August, with an average of 10.3h of sunshine.
What is the driest month in Groton?
September is the month with the least rainfall. Rain falls for 9.9 days and accumulates 1.3" (33mm) of precipitation.
What is the wettest month in Groton?
The month with the most rainfall in Groton, Massachusetts, is December, when the rain falls for 9.7 days and typically aggregates up to 2.8" (71mm) of precipitation.
What is the month with the shortest days in Groton?
With an average of 9h and 6min of daylight, December has the shortest days of the year.
Average temperature
Groton, MA
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (31.3°F).
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (19.4°F).
Average pressure
Groton, MA
- Average pressure in January:
30.01"Hg - Average pressure in February:
29.99"Hg - Average pressure in March:
30.03"Hg - Average pressure in April:
29.97"Hg - Average pressure in May:
30"Hg - Average pressure in June:
29.92"Hg
- Average pressure in July:
29.94"Hg - Average pressure in August:
29.97"Hg - Average pressure in September:
30.05"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.07"Hg - Average pressure in December:
30.04"Hg
The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
Groton, MA
- Average wind speed in January:
8.4mph - Average wind speed in February:
8.2mph - Average wind speed in March:
8.1mph - Average wind speed in April:
7.8mph - Average wind speed in May:
6.5mph - Average wind speed in June:
6mph
- Average wind speed in July:
5.5mph - Average wind speed in August:
5.4mph - Average wind speed in September:
5.7mph - Average wind speed in October:
6.9mph - Average wind speed in November:
7.3mph - Average wind speed in December:
8mph
The windiest month (with the highest average wind speed) is January (8.4mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).
Average humidity
Groton, MA
The month with the highest relative humidity is February (81%).
The month with the lowest relative humidity is April (71%).
Average rainfall
Groton, MA
- Average rainfall in January:
2.13" - Average rainfall in February:
2.09" - Average rainfall in March:
2.48" - Average rainfall in April:
2.64" - Average rainfall in May:
2.09" - Average rainfall in June:
2.32"
The wettest month (with the highest rainfall) is December (2.8").
The driest month (with the least rainfall) is September (1.3").
Average rainfall days
Groton, MA
- Average rainfall days in January:
7.8 days - Average rainfall days in February:
7.7 days - Average rainfall days in March:
11.4 days - Average rainfall days in April:
14.5 days - Average rainfall days in May:
15.5 days - Average rainfall days in June:
14.6 days
- Average rainfall days in July:
14.5 days - Average rainfall days in August:
13.2 days - Average rainfall days in September:
9.9 days - Average rainfall days in October:
13.5 days - Average rainfall days in November:
9.9 days - Average rainfall days in December:
9.7 days
The month with the highest number of rainy days is May (15.5 days).
The month with the least rainy days is February (7.7 days).
Average snowfall
Groton, MA
- Average snowfall in January:
4.25" - Average snowfall in February:
6.3" - Average snowfall in March:
4.76" - Average snowfall in April:
1.69" - Average snowfall in May:
0.12" - Average snowfall in June:
0"
The month with the highest snowfall is February (6.3").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Groton, MA
- Average snowfall days in January:
8.1 days - Average snowfall days in February:
7.8 days - Average snowfall days in March:
7.6 days - Average snowfall days in April:
1.6 days - Average snowfall days in May:
0.1 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0.3 days - Average snowfall days in November:
1.8 days - Average snowfall days in December:
5.3 days
The month with the highest number of snowfall days is January (8.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Groton, MA
- Average daylight in January:
9h and 3min - Average daylight in February:
10h and 4min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 4min - Average daylight in June:
15h and 2min
- Average daylight in July:
14h and 5min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 5min - Average daylight in December:
9h and 1min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in January:
5h and 1min - Average sunshine in February:
4h and 4min - Average sunshine in March:
5h and 5min - Average sunshine in April:
8h and 1min - Average sunshine in May:
8h and 2min - Average sunshine in June:
9h and 0min
- Average sunshine in July:
10h and 1min - Average sunshine in August:
10h and 2min - Average sunshine in September:
8h and 2min - Average sunshine in October:
5h and 5min - Average sunshine in November:
5h and 3min - Average sunshine in December:
4h and 5min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days
Groton, MA
- Average sunshine days in January:
17.9 days - Average sunshine days in February:
14.5 days - Average sunshine days in March:
14.9 days - Average sunshine days in April:
13.6 days - Average sunshine days in May:
13.5 days - Average sunshine days in June:
14 days
- Average sunshine days in July:
14.6 days - Average sunshine days in August:
16.4 days - Average sunshine days in September:
17.7 days - Average sunshine days in October:
15.3 days - Average sunshine days in November:
18.4 days - Average sunshine days in December:
17.7 days
The month with the most sunshine days is November (18.4 days).
The month with the least sunshine days is May (13.5 days).
Average UV index
Groton, MA
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
Groton, MA
The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility
Groton, MA
The months with the highest visibility are April, October, November and December (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August and September (5mi).
Groton, Massachusetts, USA
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