July in Groton Long Point stays fresher than in 88% of U.S. towns
In January the night’s low is typically 23°. Its yearly precipitation tops that of 62% of U.S. towns. Warming shows here too: 2.1° more than in 1901–2000, led by December. From May to October, highs of 64–81° make it easy to spend the day outdoors.
A year in Groton Long Point at a glance
Each month’s typical high and low, and what it brings.
What stands out about Groton Long Point’s climate
Compared with towns across the U.S., with Groton Long Point’s place in Connecticut beside it.
What a year in Groton Long Point feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 194 frost-free days a year
In half of years the last 32° night comes by April 16 and the first by October 28. Frost and day counts come from NOAA’s station at Groton New London Airport, 2.2 miles from the town’s center, at about the same height.
The 2023 USDA map puts Groton Long Point’s center in zone 7a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 4°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 25 inches of snow a winter
Snow, measured at Groton, CT, falls mostly in February. Precipitation (rain plus melted snow) adds up to 46 inches a year; October is the wettest month and February the driest. Rain or snow falls on about 128 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Groton Long Point
90% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Groton New London Airport.
Living with Groton Long Point’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
194 frost-free days in zone 7a. The last frost comes by Apr 16 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 28.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August, September and October. 1.0 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Groton Long Point from natural hazards, river flooding is the largest share (45%); heat waves, cold waves, winter storms and ice storms together are 1%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Groton Long Point and similar climates
TownRatings has no climate map of the towns around Groton Long Point yet.
Climates most like Groton Long Point’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Groton Long Point, CT | 23° | 81° | 46" | 25" |
| Princeton, WV | 23° | 82° | 41" | 24" |
| Galax, VA | 25° | 82° | 48" | 17" |
| Jeannette, PA | 21° | 83° | 44" | 30" |
| Bellefontaine, OH | 19° | 83° | 42" | 26" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Groton Long Point averaged 2.1° warmer than the 1900s. The biggest change is in December (+3.6°).
A bigger shift than in 92% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Groton Long Point compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Groton Long Point’s place among Connecticut’s.
Groton Long Point weather by month
Highs, lows and precipitation from NOAA’s grid at Groton Long Point’s center; snow, wet days and snow on the ground from Groton, CT. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 39° | 23° | 3.4" | 5.8" | 11 | 7 | 23° – 38° |
| February | 40° | 24° | 3.0" | 8.3" | 10 | 7 | 20° – 39° |
| March | 47° | 31° | 4.3" | 3.9" | 12 | 3 | 33° – 46° |
| April | 57° | 39° | 4.1" | 0.8" | 12 | 0 | 45° – 52° |
| May | 67° | 49° | 3.6" | 0.0" | 12 | 0 | 53° – 63° |
| June | 76° | 58° | 3.7" | 0.0" | 10 | 0 | 64° – 69° |
| July | 81° | 65° | 3.2" | 0.0" | 10 | 0 | 69° – 77° |
| August | 80° | 64° | 3.7" | 0.0" | 9 | 0 | 69° – 76° |
| September | 74° | 57° | 4.1" | 0.0" | 10 | 0 | 63° – 69° |
| October | 64° | 46° | 4.4" | 0.0" | 10 | 0 | 52° – 61° |
| November | 53° | 37° | 3.6" | 0.5" | 10 | 0 | 41° – 49° |
| December | 44° | 29° | 4.3" | 5.2" | 12 | 4 | 30° – 48° |
| Year | 60° | 44° | 45.5" | 24.5" | 128 | 21 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 20° to 39°. June is the most reliable, staying within 5°.
Where Groton Long Point’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Groton Long Point’s center.
- Snow: Groton, CT.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Groton New London Airport, 2.2 miles from the town’s center, at about the same height; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Groton Long Point’s climate
What is the weather like in Groton Long Point?
A typical July afternoon reaches 81°, a January night drops to 23°, and about 25 inches of snow falls in a normal winter. Milder January nights than 57% of U.S. towns; cooler July afternoons than 88% of U.S. towns.
How cold does it get in Groton Long Point in winter?
January nights average 23°. About 107 nights a year reach 32° or below and 1 reach 0° or below. In the coldest January of the last 30 years the month averaged 23°.
How much snow does Groton Long Point get?
About 25 inches in a normal winter at Groton, CT, most of it in February, with snow on the ground about 21 days a year.
How hot does it get in Groton Long Point?
July, with a typical high of 81° and a low of 65°. About 2 days a year reach 90° (Groton New London Airport).
When is the first and last frost in Groton Long Point?
In half of years the last spring frost (32°) comes by April 16 and the first fall frost by October 28, about 194 frost-free days, at Groton New London Airport.
What growing zone is Groton Long Point in?
Zone 7a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 4°.
What is the best time of year to visit Groton Long Point?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Groton Long Point getting warmer?
Yes: 1991–2020 averaged 2.1° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 92% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Groton Long Point.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.