Best year time to visit Groton

General weather information about Groton

Average annual temperature is 7.8 °C

Absolute maximum temperature: 36.0 °C

Absolute minimum temperature: -29.2 °C

Number of sunny days: 211 days

Number of rainy days: 115 days

Number of snow days: 39 days

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* Weather data for Groton United States is based on climate observations for 2026 year

Groton air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)2.03.83.218.831.335.836.033.834.530.315.011.3
Average daytime temperature (°C)-5.7-3.0-2.68.224.029.028.127.724.714.57.73.9
Average temperature (°C)-9.2-8.3-7.22.817.323.321.822.119.19.42.1-0.6
Average night temperature (°C)-12.6-12.6-11.1-1.510.817.615.917.314.35.4-2.1-3.6
Absolute minimum temperature (°C)-28.1-29.2-21.2-12.5-0.312.010.012.28.3-7.3-12.0-10.3

Groton monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)9.011.012.014.015.015.015.014.013.011.010.08.0
Daylight mean duration (h)9.210.411.913.514.915.615.314.112.510.99.58.8
Daylight minimum duration (h)8.09.011.012.014.015.014.013.011.010.09.08.0
Sunshine mean duration (h)3.27.17.39.512.312.513.011.19.97.57.54.7
Precipitation (mm)17234361581044710076361047
Sunny days201817121913171716162620
Rainy days1231312171414141339
Snow days10811500000212

Groton - weather forecast by months

Groton weather in januaryGroton weather in februaryGroton weather in marchGroton weather in aprilGroton weather in mayGroton weather in juneGroton weather in julyGroton weather in augustGroton weather in septemberGroton weather in octoberGroton weather in novemberGroton weather in december

Best time to visit Groton:

The best time to visit Groton during the most sunny months:

  • May — 12.3(h)
  • June — 12.5(h)
  • July — 13.0(h)
  • August — 11.1(h)

Months with the longest average daylight duration in Groton:

  • June — 15.6(h)
  • July — 15.3(h)

The largest precipitation sum in Groton is at

  • June — 104(mm)
  • August — 100(mm)
  • September — 76(mm)

    • Weather forecast in the closest to Groton admin centers

    Weather forecast in the closest towns to Groton

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    Frequently asked questions

    When is the best time to visit Groton?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit Groton.
    What is the weather like in Groton?
    See average temperature, rainfall and daylight hours for Groton by month in the table above.
    How many sunny days does Groton have?
    The monthly weather statistics above show sunshine and rainfall patterns for Groton throughout the year.