Groton (CT) Weather and Climate: A Comprehensive Guide
The temperature in Groton can vary greatly throughout the year.
The temperatures shift from warm
to cold.
It also has a relatively rain/snowy climate with high levels of precipitation.
Let's now guide you through the climate details for a complete overview.
Average maximum day and minimum night temperature
Depending on the time of the year, temperatures range from comfortable to chilly in Groton. On average, daytime temperatures range from a comfortable 27°C in July to a chilly 4°C in January.
Nighttime temperatures can drop, with average lows reaching -5°C in January. Check out our detailed temperature page for more information.Temperature ranges by month
Precipitation and rainy days
Groton has a relatively rain/snowy climate with high precipitation levels, averaging 1244 mm of rain/snowfall annually. The wettest period in Groton occurs in December, which receives around 128 mm of precipitation. During the driest month, November, Groton experiences moderate rainfall, totaling approximately 93 mm. The consistent precipitation levels throughout the year contribute to a relatively stable climate.The mean monthly precipitation over the year, including rain, hail and snow
The average number of days each month with precipitation
Sunshine over the year
In Groton, summer days are longer and more sunny, with daily sunshine hours peaking at 9.8 hours in July. As the darker season arrives, the brightness of the sun becomes less. November sees a soft sun for only 4.6 hours per average day. Visit our detailed sunshine hours page for more information.Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Average humidity
The relative humidity is high throughout the year in Groton.
The city experiences its highest humidity in September, reaching 72%. In April, the humidity drops to its lowest level at 58%. Explore our detailed page on humidity levels for further details.
Relative humidity over the year
partly cloudy and no rain overcast and slight rain overcast and slight rainForecast for Groton (CT)
3 m/s
3 m/s
5 m/s
The best time of year to visit Groton in the United States of America
During the months of June and September you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.Other facts from our historical weather data:
July has an average maximum temperature of 27°C and is the warmest month of the year.
The coldest month is January with an average maximum temperature of 4°C.
December tops the wettest month list with 128 mm of rainfall.
November is the driest month with 93 mm of precipitation.
July is the sunniest month with an average of 293 hours of sunshine.
No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
