Weather & Climate at Research & Development Center Coast Guard Base

Groton, CT

Summary of the weather and climate in Groton, CT:

The average high is 60.2°F and the average low is 44°F.
The hottest month is July with a high of 81°F.
The coldest month is January with a low of 22.5°F.
Annual rainfall is 49.68 inches; the rainiest month is March (5.07 in).
Annual snowfall is 23.2 inches; the snowiest month is February (7.5 in).

Source: NOAA climate normals.

Temperatures through the year

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Bars span each month's average low to average high (20°F – 90°F scale).

Monthly averages

Month	High (°F)	Low (°F)	Rain (in)	Snow (in)
January	38.4	22.5	3.78	6
February	41	24.9	3.51	7.5
March	47.9	31.6	5.07	3
April	57.4	40.9	4.54	0.8
May	66.9	49.5	3.65	0
June	75.7	59.1	4.08	0
July	81	65.3	3.63	0
August	79.9	64.5	4.29	0
September	73.6	57.2	4.16	0
October	63.2	46	4.15	0
November	53.9	37.9	4.54	0.8
December	43.6	28.2	4.28	5.1