Monthly Temperature Averages and Climate for Groton, CT

Adventure graphic for climate page specific to each city and state

Groton, CT has a longitude of -72.1 degrees and a latitude of 41.3 degrees.

Groton, CT has temperatures that can go as high as 73.5 °F in June, 78.9 °F in July, and 78.9 °F in August. The hottest month is typically July.

Groton, CT also has temperatures that can go as low as 26.7 °F in December, 23.0 °F in January, and 23.1 °F in February. The coldest month is typically January.

The wettest month for Groton, CT is March with 15.8 inches of rain.

The annual weather and monthly temperature averages for highs and lows are presented in the table below. The weather values used to interpolate these values are provided by the US NAOO weather station values from the last 10 years.

JanFebMarAprMayJunJulAugSepOctNovDec
Average High (°F)37.539.346.555.564.573.578.978.971.762.653.642.8
Average Low (°F)23.023.130.339.348.357.362.862.755.544.735.726.7
Average Precipitation (in)8.98.015.811.810.011.09.99.010.913.09.811.8
Tree Graphic for climate page specific to city and state for annual weather site

Connecticut lies at the rough transition zone between the southern end of the humid continental climate, and the northern portion of the humid subtropical climate. Northern Connecticut generally experiences a climate with cold winters with moderate snowfall and hot, humid summers.

Far southern and coastal Connecticut has a climate with cool winters with a mix of rain and infrequent snow, and the long hot and humid summers typical of the middle and lower East Coast.

In reality, each climate is unique and finding one that is suitable can be a real challenge! We hope that the information here can be the starting point of your weather and climate research for your next vacation or potentially next home.

We hope you use this information to make your travel plans to Groton, CT or decide if living in the Groton climate is the right choice for you!

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