Photo: John Phelan · CC BY-SA 4.0Glastonbury gets more rain and snow than 72% of U.S. towns: 47 inches of precipitation a year
In January the night’s low is typically 19°. The seasons are far apart: from a winter night to a summer afternoon the average spans 65°. Winter nights are cold: in January they are colder than in 64% of U.S. towns. Seedlings are safe outdoors from about April 17, with the first autumn frost due around October 26.
A year in Glastonbury at a glance
Each month’s typical high and low, and what it brings.
What stands out about Glastonbury’s climate
Compared with towns across the U.S., with Glastonbury’s place in Connecticut beside it.
What a year in Glastonbury feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 191 frost-free days a year
In half of years the last 32° night comes by April 17 and the first by October 26. Frost and day counts come from NOAA’s station at Hartford Brainard Fld, CT, 6 miles from the town’s center, 370 ft lower.
The 2023 USDA map puts Glastonbury’s center in zone 6b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −2°. 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 52 inches of snow a winter
Snow, measured at Hartford Bradley International Airport, is heaviest from January through February, about 15 inches a month. Precipitation (rain plus melted snow) adds up to 47 inches a year; October is the wettest month and February the driest. Rain or snow falls on about 130 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Glastonbury
86% 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 Hartford Brainard Fld, CT.
Living with Glastonbury’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
191 frost-free days in zone 6b. The last frost comes by Apr 17 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 26.
Months with highs of 62–84° and lows of 40° or more: May, June, August, September and October. 174 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Glastonbury from natural hazards, river flooding is the largest share (81%); heat waves, cold waves, winter storms and ice storms together are 7%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Glastonbury and its neighbors
Bolton has the coldest January nights next door (18°, 1° colder) and East Hartford the hottest July afternoons (85°, 1° warmer). Differences under a degree are within what the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Glastonbury’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 |
|---|---|---|---|---|
| Glastonbury, CT | 19° | 84° | 47" | 52" |
| Latrobe, PA | 21° | 84° | 47" | 48" |
| Buckhannon, WV | 23° | 83° | 50" | 39" |
| Manchester, MD | 22° | 84° | 47" | 34" |
| North Canton, OH | 20° | 83° | 41" | 47" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in Glastonbury averaged 1.9° warmer than the 1900s. The biggest change is in December (+3.4°).
A bigger shift than in 84% 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 Glastonbury compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Glastonbury’s place among Connecticut’s.
Glastonbury weather by month
Highs, lows and precipitation from NOAA’s grid at Glastonbury’s center; snow, wet days and snow on the ground from Hartford Bradley International Airport. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 36° | 19° | 3.4" | 14.2" | 11 | 19° – 34° |
| February | 39° | 21° | 3.0" | 14.8" | 11 | 16° – 36° |
| March | 47° | 28° | 4.1" | 9.4" | 11 | 31° – 46° |
| April | 60° | 37° | 4.1" | 1.1" | 12 | 44° – 53° |
| May | 71° | 47° | 3.6" | 0.0" | 12 | 54° – 63° |
| June | 79° | 56° | 4.3" | 0.0" | 12 | 65° – 71° |
| July | 84° | 62° | 3.9" | 0.0" | 11 | 68° – 77° |
| August | 82° | 61° | 4.0" | 0.0" | 10 | 68° – 76° |
| September | 75° | 53° | 4.1" | 0.0" | 9 | 61° – 68° |
| October | 63° | 42° | 4.7" | 0.7" | 11 | 48° – 59° |
| November | 52° | 33° | 3.8" | 1.4" | 10 | 37° – 47° |
| December | 41° | 25° | 4.3" | 10.1" | 12 | 26° – 43° |
| Year | 61° | 40° | 47.4" | 51.7" | 130 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 16° to 36°. June is the most reliable, staying within 6°.
Where Glastonbury’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 Glastonbury’s center.
- Snow: Hartford Bradley International Airport.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Hartford Brainard Fld, CT, 6 miles from the town’s center, 370 ft lower; 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 Glastonbury’s climate
What is the weather like in Glastonbury?
A typical July afternoon reaches 84°, a January night drops to 19°, and about 52 inches of snow falls in a normal winter. Colder January nights than 64% of U.S. towns; cooler July afternoons than 59% of U.S. towns.
How cold does it get in Glastonbury in winter?
January nights average 19°. About 121 nights a year reach 32° or below and 2 reach 0° or below. In the coldest January of the last 30 years the month averaged 19°.
How much snow does Glastonbury get?
About 52 inches in a normal winter at Hartford Bradley International Airport, heaviest from January through February, about 15 inches a month.
How hot does it get in Glastonbury?
July, with a typical high of 84° and a low of 62°. About 17 days a year reach 90° (Hartford Brainard Fld, CT).
When is the first and last frost in Glastonbury?
In half of years the last spring frost (32°) comes by April 17 and the first fall frost by October 26, about 191 frost-free days, at Hartford Brainard Fld, CT.
What growing zone is Glastonbury in?
Zone 6b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −2°.
What is the best time of year to visit Glastonbury?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, August, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Glastonbury getting warmer?
Yes: 1991–2020 averaged 1.9° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 84% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Glastonbury.
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.