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Weather in Groton, CT · National Weather Service + NOAA

Groton stays cool in summer

Groton has chilly winters and pleasant summers. A typical July afternoon reaches 81°, a January night drops to 23°, and about 25 inches of snow falls in a normal winter. Normal November highs come to 53°, and lows to 37°.

Winter 41°/26°Spring 57°/40°Summer 79°/62°Fall 64°/47°
Right now
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Sunrise 6:21 am · sunset 4:42 pm

Getting the latest forecast from the National Weather Service…

What stands out about Groton’s weather

Read from 30 years of NOAA records. Each one opens the full story on the Climate page.

Climate →
Cool summersJuly afternoons average 81°, cooler than 336 of 364 Connecticut towns.Milder winters than most of ConnecticutJanuary nights average 23°, milder than 328 of 364 Connecticut towns.Warming faster than mostThe last 30 years averaged 2.1° warmer than the 1900s, a bigger shift than 96% of U.S. towns.Less snow than most of ConnecticutAbout 25 inches a winter, less than 331 of 353 Connecticut towns.
A normal year

Where today sits in Groton’s year

Typical highs and lows month by month, from 30 years of NOAA records.

Full climate →
Winter
41° / 26°
8 days with an inch or more of snow
Spring
57° / 40°
Last frost around Apr 16
Summer
79° / 62°
2 days reach 90° in a normal year
Fall now
64° / 47°
First frost around Oct 28
Pastthe usual first frost (Oct 28). Last frost next spring: Apr 16
Best months to be outside
MayJunJulAugSepOct
Highs of 62–84° and lows of 40° or more
How much snow does Groton get?About 25 inches a winter.When is it wettest?October, with 4.4 inches.Is it warmer than it used to be?+2.1° vs. the 20th century.

Weather talk

Road reports, first frosts and storm memories from neighbors in Groton.

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Forecast, conditions and alerts: National Weather Service. Climate: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Temperatures and rainfall come from NOAA’s gridded normals for Groton itself (about a 3-mile square). Snow, frost dates and day counts: the NOAA station at Groton, CT (2 mi, snow) and Groton New London Airport, CT (1 mi, frost, heat and degree days). Sunrise and sunset are calculated from the town’s position. Normals are 30-year averages, not a forecast.