Groton, CT Weather & Climate Normals
Groton's real weather, in one number
Groton, CT scores 51/100 on this site's reading of NOAA's own 30-year normals: strongly seasonal. Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. 5 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
Groton's hottest and coldest months
Groton's hottest month is Jul, averaging 72°F; its coldest is Jan, averaging 31°F, a 41.5°F swing across the year, a middling gap by national standards.
Rain and snow in Groton
Over a typical year, Groton sees about 39.31in of precipitation a year across roughly 116 days with measurable rain or snow. That station has no snowfall reading, so none is shown rather than assumed.
Where Groton ranks
Groton ranks 1547 of 4876 US cities in this dataset for comfort score, and 4 of 21 within CT. About 10,160 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from GROTON NEW LONDON AP, CT US, 0.9 miles from Groton, not a prediction for any specific day.
More on how this is worked out
Why some cities show no snow or rain figure · How the comfort score is calculated