The year at a glance
Averages from 30 years of climate history, 1991-2020
| Groton | Metric | Norwich |
|---|---|---|
| 200 days | Sunny daysclear or partly cloudy skies | 200 days |
| 46 in | Precipitationper year | 46 in |
| 123 days | Wet daysrain or snow per year | 123 days |
| 25 in | Snowfallper year | 28 in |
| 2 days | Hot daysabove 90 °F | 14 days |
| 101 days | Freezing nightsat or below 32 °F | 115 days |
| 73% | Humidityaverage relative | 72% |
| 52 °F | Average temperatureyear round | 52 °F |
Monthly temperatures
Average daily high and low for each month, in °F. The gap between the two lines is what an ordinary day feels like across the year.
Daily highs
Daily lows
View monthly temperatures as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Groton high | 38 | 40 | 47 | 56 | 65 | 74 | 80 | 79 | 74 | 63 | 53 | 44 |
| Norwich high | 38 | 40 | 48 | 59 | 70 | 78 | 84 | 83 | 75 | 64 | 53 | 43 |
| Groton low | 23 | 25 | 31 | 39 | 49 | 58 | 65 | 64 | 57 | 46 | 37 | 29 |
| Norwich low | 21 | 23 | 29 | 39 | 49 | 58 | 65 | 63 | 55 | 44 | 34 | 27 |
Monthly precipitation
Total rain plus melted snow for each month, in inches. Taller bars mean wetter months.
View monthly precipitation as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Groton | 3.6 | 3.2 | 4.4 | 3.9 | 3.2 | 3.8 | 3.5 | 4.2 | 4.0 | 4.2 | 3.7 | 4.5 |
| Norwich | 3.6 | 3.2 | 4.4 | 3.9 | 3.2 | 3.8 | 3.5 | 4.2 | 4.0 | 4.2 | 3.7 | 4.5 |
Monthly sunny days
Days each month with clear or partly cloudy skies, so compare the same month between cities.
View monthly sunny days as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Groton | 18 | 16 | 16 | 16 | 15 | 15 | 18 | 18 | 17 | 18 | 17 | 16 |
| Norwich | 18 | 16 | 16 | 16 | 15 | 15 | 18 | 18 | 17 | 18 | 17 | 16 |
Keep comparing
Nearby cities and popular picks for each side of this matchup. Any two cities can be compared from the home page.
Groton vs another city
- Groton vs New London, CT
- Groton vs Conning Towers-Nautilus Park, CT
- Groton vs Pawcatuck, CT
- Groton vs Westerly, RI
- Groton vs Springs, NY
- Groton vs New York, NY
- Groton vs Los Angeles, CA
- Groton vs Chicago, IL
- Groton vs Houston, TX
- Groton vs Phoenix, AZ
- Groton vs Philadelphia, PA
Norwich vs another city
- Norwich vs Conning Towers-Nautilus Park, CT
- Norwich vs Willimantic, CT
- Norwich vs New London, CT
- Norwich vs Pawcatuck, CT
- Norwich vs Westerly, RI
- Norwich vs New York, NY
- Norwich vs Los Angeles, CA
- Norwich vs Chicago, IL
- Norwich vs Houston, TX
- Norwich vs Phoenix, AZ
- Norwich vs Philadelphia, PA
About this data
Every figure on this page is a 30 year average computed from daily climate history for 1991-2020, using each city's own coordinates. Wet days count days with measurable precipitation, calibrated against the wet day counts in NOAA's published climate normals. Sunny days count clear plus partly cloudy days, defined as average cloud cover of 63 percent or less and calibrated against NOAA's published sky cover tables. Snowfall figures are model estimates anchored to NOAA station measurements near each city.
Weather data by Open-Meteo.com (CC BY 4.0). Contains modified Copernicus Climate Change Service information (ERA5, ERA5-Land).