Colebrook, New Hampshire climate: Normal weather by month, frost dates and records
Colebrook's normal year runs from 0°F January nights to 77°F July afternoons, with 41.3 inches of precipitation and 81 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 4.3°C, January lows of −18°C, July highs of 25°C, 1,048 mm of precipitation a year.
- NOAA stationColebrook (3 mi SW)
- Station IDUSC00271647
- Location44.86°N 71.54°W
- Elevation1,120 ft (341 m)
- Population (town)2,100
- Census place1,143
On October 23, the normal high in Colebrook is 52°F and the normal low 29°F, and the chance of measurable rain or snow is 42%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Colebrook.
- Jan 24° 0°
- Feb 27° 0°
- Mar 36° 11°
- Apr 50° 26°
- May 64° 37°
- Jun 72° 47°
- Jul 77° 52°
- Aug 76° 50°
- Sep 68° 43°
- Oct 55° 32°
- Nov 42° 22°
- Dec 30° 10°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Colebrook each month?
July is the warmest month, with normal highs of 77°F; January the coldest, with normal lows of 0°F. The most precipitation falls in June (4.68 in), the least in February (2.04 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 24°F | 0°F | 12.3°F | 2.71 | 18.2 | 13 | <1 | 31 | 9 h 10 min |
| February | 27°F | 0°F | 13.6°F | 2.04 | 19.9 | 10 | <1 | 27 | 10 h 20 min |
| March | 36°F | 11°F | 23.7°F | 2.49 | 14.5 | 10 | <1 | 29 | 11 h 50 min |
| April | 50°F | 26°F | 37.8°F | 2.86 | 3.4 | 10 | <1 | 22 | 13 h 30 min |
| May | 64°F | 37°F | 50.7°F | 3.99 | 0.1 | 12 | <1 | 9 | 14 h 50 min |
| June | 72°F | 47°F | 59.9°F | 4.68 | 0.0 | 14 | <1 | 1 | 15 h 30 min |
| July | 77°F | 52°F | 64.7°F | 4.25 | 0.0 | 13 | <1 | <1 | 15 h 20 min |
| August | 76°F | 50°F | 62.9°F | 4.22 | 0.0 | 12 | <1 | <1 | 14 h 10 min |
| September | 68°F | 43°F | 55.6°F | 3.40 | 0.0 | 11 | <1 | 3 | 12 h 40 min |
| October | 55°F | 32°F | 43.4°F | 4.39 | 0.9 | 13 | <1 | 15 | 11 h |
| November | 42°F | 22°F | 31.6°F | 3.13 | 5.9 | 13 | <1 | 24 | 9 h 40 min |
| December | 30°F | 10°F | 20.0°F | 3.11 | 18.5 | 15 | <1 | 30 | 8 h 50 min |
| Year (annual) | 52°F | 28°F | 39.7°F | 41.27 | 81.4 | 145 | 1 | 191 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −4°C | −18°C | −10.9°C | 69 mm | 46 cm |
| February | −3°C | −18°C | −10.2°C | 52 mm | 51 cm |
| March | 2°C | −12°C | −4.6°C | 63 mm | 37 cm |
| April | 10°C | −4°C | 3.2°C | 73 mm | 9 cm |
| May | 18°C | 3°C | 10.4°C | 101 mm | 0 cm |
| June | 22°C | 9°C | 15.5°C | 119 mm | 0 cm |
| July | 25°C | 11°C | 18.2°C | 108 mm | 0 cm |
| August | 24°C | 10°C | 17.2°C | 107 mm | 0 cm |
| September | 20°C | 6°C | 13.1°C | 86 mm | 0 cm |
| October | 13°C | 0°C | 6.3°C | 112 mm | 2 cm |
| November | 5°C | −6°C | −0.2°C | 80 mm | 15 cm |
| December | −1°C | −12°C | −6.7°C | 79 mm | 47 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00271647; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Colebrook?
Normal highs sit between 65°F and 85°F in June, July, August and September. Of those, September has the fewest days with rain (11).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00271647.
When is the last frost in Colebrook?
In Colebrook, the last spring frost (32°F) comes after May 31 in half of years and after June 14 in one year in ten; the first autumn frost comes before September 21 in half of years and before September 7 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- May 311 year in 10 after June 14; 9 in 10 after May 16
- First autumn frost, half of years before
- September 211 year in 10 before September 7; 9 in 10 before October 2
NOAA puts the median frost-free season at 112 days, and the season without a hard freeze (28°F) at 135 days.
A hard freeze (28°F) comes after May 17 in half of springs and before October 1 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Colebrook in zone 4a in ZIP code 05903, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Colebrook's NOAA station is in zone 4a: the coldest night of a typical year reaches −27°F (24 complete years).
Frost dates for every NOAA station in New Hampshire · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00271647; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in Colebrook?
In a normal year in Colebrook, 1 day a year reaches 90°F, 191 nights fall to 32°F or colder and 145 days bring measurable precipitation.
- Days at 90°F or more
- 1a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 191a normal year
- Days that stay below freezing
- 77high of 32°F or less
- Days with 0.01 inch of precipitation
- 145a normal year
- Days with 1 inch of snow or more
- 31a normal year
The highest temperature in this station's record (since 1960) is 95°F, on August 3, 1975; the lowest is −42°F, on February 2, 1962.
The wettest calendar year on that record is 1973, with 52.61 in; the snowiest season is 1970–71, with 151.8 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00271647; records: ACIS (NOAA Regional Climate Centers), station USC00271647. Records use complete months only; a month missing more than three days is left out.
How sunny is Colebrook?
Over a year 66% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Colebrook, 3.5 kWh per square metre a day. September is the sunniest month (73%) and December the cloudiest (54%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 59% | 1.4 |
| February | 62% | 2.3 |
| March | 65% | 3.5 |
| April | 64% | 4.4 |
| May | 64% | 5.1 |
| June | 67% | 5.5 |
| July | 71% | 5.6 |
| August | 73% | 5.0 |
| September | 73% | 4.0 |
| October | 62% | 2.4 |
| November | 59% | 1.6 |
| December | 54% | 1.1 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Colebrook need?
A normal year in Colebrook brings 9,336 heating degree days, 74% more than the median U.S. place (5,373), and 148 cooling degree days, 84% fewer than the median (908). Eight months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 1,527 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,634 | 0 |
| February | 1,439 | 0 |
| March | 1,280 | 0 |
| April | 815 | 0 |
| May | 447 | 4 |
| June | 183 | 30 |
| July | 71 | 61 |
| August | 105 | 40 |
| September | 295 | 13 |
| October | 671 | 0 |
| November | 1,002 | 0 |
| December | 1,395 | 0 |
| Year (annual) | 9,336 | 148 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00271647. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Has Colebrook been warmer than normal lately?
2025 averaged 39.9°F, 0.2°F above the 1991-2020 normal of 39.7°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 40.1°F | +0.4°F | 34.43 | – |
| 2022 | 40.5°F | +0.8°F | 43.57 | – |
| 2023 | 42.7°F | +3.0°F | 47.25 | – |
| 2024 | 43.1°F | +3.4°F | 49.96 | – |
| 2025 | 39.9°F | +0.2°F | – | – |
Over 43 complete years from 1969 to 2024, the station's annual mean temperature rose at a fitted 6.9°F per century (+0.38°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00271647; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Colebrook's climate compare?
Colebrook is warmer than 0 of the other 27 places with their own NOAA record in New Hampshire, and wetter than 8. Across the 7,247 U.S. stations with normals, its annual mean of 39.7°F is warmer than 5%.
In the Köppen classification computed from these normals, Colebrook is Dfb: continental, no dry season, warm summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Colebrook share this climate record?
2 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Canaan, VT896 people · 10 mi N
- Beecher Falls, VT73 people · 11 mi N
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Colebrook's climate
What is the coldest month in Colebrook?
January, with a normal high of 24°F and a normal low of 0°F. The warmest is July (77°F by day, 52°F at night).
Does it snow in Colebrook?
Yes: 81 inches in a normal year, falling on 48 days with 0.1 inch or more, the most in February (19.9 inches).
What is the rainiest month in Colebrook?
June, with 4.68 in of precipitation in a normal year; the driest is February with 2.04 in.
What plant hardiness zone is Colebrook in?
The USDA's 2023 map puts Colebrook in zone 4a in ZIP code 05903, the nearest ZIP area. By the same method at Colebrook's NOAA station, the coldest night of a typical year reaches −27°F (24 years, 1991-2020): zone 4a.
How late can frost come in Colebrook?
In half of years the last 32°F night comes after May 31; in one year in ten it comes after June 14. Waiting until June 14 leaves about a one-in-ten chance of a later frost.
Nearby and next
- New Hampshire climateThe statewide normals and every place in the state
- Averill, VT12 miles from this station, 39.1°F a year
- North Stratford, NH12 miles from this station, 41.6°F a year
- Island Pond, VT17 miles from this station, 41.1°F a year
- Errol Airport, NH19 miles from this station, 39.5°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made