Annual mean 12°C · wettest around February · prevailing wind W
Warmest
25.6 °C
Coldest
1.9 °C
Wettest
21%
Windiest
4.1 m/s
Prevailing
W
3.4 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Groton over the whole year is 12°C. July is the hottest month, with highs of about 25°C; January is the coldest, with lows of about -1°C. Groton has no sharply defined rainy season: the chance of rain on a given day runs from 10% in June, the driest month, to 21% in February, the wettest. Winds in Groton are highest in March, averaging 3.2 m/s (12 km/h), and lightest in July, at 2.1 m/s (8 km/h). The prevailing wind is from the W. The clearest skies in Groton come in August, when the sky is typically 36% covered; May is the cloudiest month, at 49%.
Month by month Groton climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
3°C
-1°C
-3°C
19%
47%
3.0 m/s
0
0
6
February
4°C
0°C
-2°C
21%
45%
2.8 m/s
0
0
10
March
7°C
2°C
1°C
15%
43%
3.2 m/s
1
0
20
April
11°C
7°C
6°C
15%
49%
3.1 m/s
8
1
46
May
16°C
12°C
13°C
15%
49%
2.6 m/s
40
3
77
June
22°C
17°C
21°C
10%
40%
2.3 m/s
78
23
63
July
25°C
21°C
26°C
10%
39%
2.1 m/s
59
60
25
August
25°C
20°C
26°C
10%
36%
2.1 m/s
65
53
31
September
22°C
17°C
21°C
11%
43%
2.4 m/s
78
22
63
October
17°C
12°C
14°C
14%
45%
2.7 m/s
48
3
76
November
10°C
6°C
5°C
12%
36%
2.9 m/s
11
0
42
December
5°C
2°C
-0°C
17%
45%
2.7 m/s
0
0
14
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Groton weather by season
Year round, Groton has days of about 3°C at their warmest in January, its coolest month, and 25°C in July, its warmest; the coolest hours of the day run from -1°C to 21°C through the year, and the average temperature over the year is 12°C around the clock. Rain is most likely around February and least likely around June. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Groton weather in winterDecember to February
High 4°CLow 1°CRain 19%
Winter in Groton has typical daily highs of about 4°C and lows of about 1°C, with a 19% chance of rain on a given day.
Groton weather in springMarch to May
High 11°CLow 7°CRain 15%
Spring in Groton has typical daily highs of about 11°C and lows of about 7°C, with a 15% chance of rain on a given day.
Groton weather in summerJune to August
High 24°CLow 19°CRain 10%
Summer in Groton has typical daily highs of about 24°C and lows of about 19°C, with a 10% chance of rain on a given day.
Groton weather in autumnSeptember to November
High 16°CLow 11°CRain 12%
Autumn in Groton has typical daily highs of about 16°C and lows of about 11°C, with a 12% chance of rain on a given day.
When is the rainy season in Groton?
Groton has no sharply defined rainy season: the chance of rain on a given day runs from 10% in June, the driest month, to 21% in February, the wettest.
What time of year is Groton windiest?
Winds in Groton are highest in March, averaging 3.2 m/s (12 km/h), and lightest in July, at 2.1 m/s (8 km/h). The prevailing wind is from the W.
What is the average temperature in Groton year round?
The average temperature in Groton over the whole year is 12°C. July is the hottest month, with highs of about 25°C; January is the coldest, with lows of about -1°C.