Photo: Magicpiano · CC BY-SA 3.0Colebrook’s winters are colder and snowier than most of the U.S.
A typical July afternoon reaches 81°, a January night drops to 15°, and about 59 inches of snow falls in a normal winter.
A year in Colebrook at a glance
Each month’s typical high and low, and what it brings.
What stands out about Colebrook’s climate
Compared with towns across the U.S., with Colebrook’s place in Connecticut beside it.
What a year in Colebrook feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 161 frost-free days a year
In half of years the last 32° night comes by May 3 and the first by October 11. Frost and day counts come from NOAA’s station at Norfolk 2 Sw, CT, 8 miles from the town’s center, 150 ft higher.
The 2023 USDA map puts Colebrook’s center in zone 6a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −10°. 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 59 inches of snow a winter
Snow, measured at Bakersville, CT, falls mostly in February. Precipitation (rain plus melted snow) adds up to 53 inches a year; October is the wettest month and February the driest. Rain or snow falls on about 143 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Colebrook
95% 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 Norfolk 2 Sw, CT.
Living with Colebrook’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
161 frost-free days in zone 6a. The last frost comes by May 3 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 11.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September. 48 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Colebrook from natural hazards, river flooding is the largest share (77%); heat waves, cold waves, winter storms and ice storms together are 4%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Colebrook and its neighbors
Every town next door is within a degree of Colebrook in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Colebrook’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 |
|---|---|---|---|---|
| Colebrook, CT | 15° | 81° | 53" | 59" |
| Kennebunk, ME | 14° | 81° | 49" | 49" |
| Tamaqua, PA | 18° | 82° | 52" | 43" |
| Wakefield, NH | 11° | 80° | 49" | 81" |
| Elkins, WV | 21° | 82° | 50" | 69" |
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 Colebrook averaged 1.7° warmer than the 1900s. The biggest change is in December (+3.2°).
A bigger shift than in 74% 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 Colebrook compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Colebrook’s place among Connecticut’s.
Colebrook weather by month
Highs, lows and precipitation from NOAA’s grid at Colebrook’s center; snow, wet days and snow on the ground from Bakersville, CT. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 33° | 15° | 3.8" | 13.1" | 13 | 23 | 14° – 30° |
| February | 36° | 16° | 3.3" | 15.8" | 10 | 21 | 12° – 32° |
| March | 44° | 23° | 4.3" | 12.7" | 12 | 17 | 26° – 44° |
| April | 57° | 33° | 4.1" | 2.6" | 13 | 2 | 40° – 50° |
| May | 68° | 44° | 4.1" | 0.0" | 14 | 0 | 51° – 62° |
| June | 76° | 53° | 4.8" | 0.0" | 13 | 0 | 62° – 68° |
| July | 81° | 58° | 4.6" | 0.0" | 12 | 0 | 65° – 74° |
| August | 79° | 56° | 4.6" | 0.0" | 11 | 0 | 64° – 71° |
| September | 72° | 49° | 5.0" | 0.0" | 11 | 0 | 58° – 65° |
| October | 60° | 39° | 5.3" | 0.3" | 12 | 0 | 45° – 55° |
| November | 48° | 30° | 4.1" | 2.6" | 11 | 2 | 35° – 44° |
| December | 37° | 21° | 4.7" | 12.0" | 13 | 15 | 22° – 40° |
| Year | 58° | 36° | 52.5" | 59.1" | 143 | 80 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 12° to 32°. June is the most reliable, staying within 6°.
Where Colebrook’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 Colebrook’s center.
- Snow: Bakersville, CT.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Norfolk 2 Sw, CT, 8 miles from the town’s center, 150 ft higher; 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 Colebrook’s climate
What is the weather like in Colebrook?
A typical July afternoon reaches 81°, a January night drops to 15°, and about 59 inches of snow falls in a normal winter. Colder January nights than 86% of U.S. towns; cooler July afternoons than 86% of U.S. towns.
How cold does it get in Colebrook in winter?
January nights average 15°. About 152 nights a year reach 32° or below and 9 reach 0° or below. In the coldest January of the last 30 years the month averaged 14°.
How much snow does Colebrook get?
About 59 inches in a normal winter at Bakersville, CT, most of it in February, with snow on the ground about 80 days a year.
How hot does it get in Colebrook?
July, with a typical high of 81° and a low of 58°. About 1 days a year reach 90° (Norfolk 2 Sw, CT).
When is the first and last frost in Colebrook?
In half of years the last spring frost (32°) comes by May 3 and the first fall frost by October 11, about 161 frost-free days, at Norfolk 2 Sw, CT.
What growing zone is Colebrook in?
Zone 6a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −10°.
What is the best time of year to visit Colebrook?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Colebrook getting warmer?
Yes: 1991–2020 averaged 1.7° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 74% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Colebrook.
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.