Allagash, Maine climate: Climate normals at a NOAA weather station
Allagash's normal year runs from −6°F January nights to 77°F July afternoons, with 37.5 inches of precipitation and 100 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 3.0°C, January lows of −21°C, July highs of 25°C, 953 mm of precipitation a year.
- NOAA stationAllagash
- Station IDUSC00170200
- Location47.09°N 69.03°W
- Elevation596 ft (182 m)
On October 22, the normal high in Allagash is 50°F and the normal low 30°F, and the chance of measurable rain or snow is 40%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Allagash.
- Jan 20° -6°
- Feb 24° -6°
- Mar 34° 5°
- Apr 48° 24°
- May 63° 35°
- Jun 73° 46°
- Jul 77° 52°
- Aug 76° 49°
- Sep 67° 41°
- Oct 53° 32°
- Nov 39° 22°
- Dec 27° 7°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like at Allagash each month?
July is the warmest month, with normal highs of 77°F; January the coldest, with normal lows of −6°F. The most precipitation falls in July (4.25 in), the least in February (1.97 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 20°F | −6°F | 7.1°F | 2.56 | 19.1 | 11 | <1 | 31 | 8 h 50 min |
| February | 24°F | −6°F | 8.8°F | 1.97 | 21.0 | 10 | <1 | 28 | 10 h 20 min |
| March | 34°F | 5°F | 19.8°F | 2.17 | 17.5 | 11 | <1 | 31 | 11 h 50 min |
| April | 48°F | 24°F | 35.5°F | 2.89 | 7.1 | 12 | <1 | 27 | 13 h 30 min |
| May | 63°F | 35°F | 49.0°F | 2.88 | 0.4 | 13 | <1 | 13 | 15 h |
| June | 73°F | 46°F | 59.0°F | 3.56 | 0.0 | 13 | 1 | 2 | 15 h 50 min |
| July | 77°F | 52°F | 64.4°F | 4.25 | 0.0 | 15 | 1 | <1 | 15 h 30 min |
| August | 76°F | 49°F | 62.5°F | 3.59 | 0.0 | 12 | 1 | <1 | 14 h 20 min |
| September | 67°F | 41°F | 54.0°F | 3.40 | 0.0 | 11 | <1 | 7 | 12 h 40 min |
| October | 53°F | 32°F | 42.2°F | 3.96 | 2.1 | 13 | <1 | 20 | 11 h |
| November | 39°F | 22°F | 30.3°F | 3.28 | 8.5 | 12 | <1 | 27 | 9 h 20 min |
| December | 27°F | 7°F | 16.9°F | 3.00 | 24.0 | 13 | <1 | 31 | 8 h 30 min |
| Year (annual) | 50°F | 25°F | 37.4°F | 37.51 | 99.7 | 145 | 2 | 218 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −7°C | −21°C | −13.8°C | 65 mm | 49 cm |
| February | −5°C | −21°C | −12.9°C | 50 mm | 53 cm |
| March | 1°C | −15°C | −6.8°C | 55 mm | 44 cm |
| April | 9°C | −5°C | 1.9°C | 73 mm | 18 cm |
| May | 17°C | 2°C | 9.4°C | 73 mm | 1 cm |
| June | 23°C | 8°C | 15.0°C | 90 mm | 0 cm |
| July | 25°C | 11°C | 18.0°C | 108 mm | 0 cm |
| August | 24°C | 9°C | 16.9°C | 91 mm | 0 cm |
| September | 20°C | 5°C | 12.2°C | 86 mm | 0 cm |
| October | 12°C | 0°C | 5.7°C | 101 mm | 5 cm |
| November | 4°C | −6°C | −0.9°C | 83 mm | 22 cm |
| December | −3°C | −14°C | −8.4°C | 76 mm | 61 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00170200; 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.
Which months are mildest at Allagash?
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 USC00170200.
When is the last frost at Allagash?
In Allagash, the last spring frost (32°F) comes after June 2 in half of years and after June 21 in one year in ten; the first autumn frost comes before September 15 in half of years and before August 29 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
- June 21 year in 10 after June 21; 9 in 10 after May 21
- First autumn frost, half of years before
- September 151 year in 10 before August 29; 9 in 10 before September 30
NOAA puts the median frost-free season at 102 days, and the season without a hard freeze (28°F) at 129 days.
A hard freeze (28°F) comes after May 20 in half of springs and before September 29 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Allagash in zone 4b in ZIP code 04774, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, the station is in zone 3a: the coldest night of a typical year reaches −35°F (19 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in Maine · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00170200; 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 at Allagash?
In a normal year in Allagash, 2 days a year reach 90°F, 218 nights fall to 32°F or colder and 145 days bring measurable precipitation.
- Days at 90°F or more
- 2a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 218a normal year
- Days that stay below freezing
- 93high of 32°F or less
- Days with 0.01 inch of precipitation
- 145a normal year
- Days with 1 inch of snow or more
- 37a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00170200.
How sunny is it at Allagash?
Over a year 67% of the sunlight that would reach the ground under clear skies gets through the clouds at Allagash, 3.4 kWh per square metre a day. August is the sunniest month (72%) and December the cloudiest (54%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 61% | 1.3 |
| February | 64% | 2.1 |
| March | 67% | 3.4 |
| April | 66% | 4.5 |
| May | 65% | 5.2 |
| June | 67% | 5.6 |
| July | 71% | 5.5 |
| August | 72% | 4.8 |
| September | 71% | 3.7 |
| October | 61% | 2.2 |
| November | 55% | 1.2 |
| December | 54% | 0.9 |
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 many heating and cooling degree days does Allagash record?
A normal year at Allagash brings 10,148 heating degree days, 89% more than the median U.S. place (5,373), and 147 cooling degree days, 84% fewer than the median (908). Nine months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 1,392 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,795 | 0 |
| February | 1,575 | 0 |
| March | 1,403 | 0 |
| April | 885 | 0 |
| May | 499 | 3 |
| June | 207 | 27 |
| July | 81 | 61 |
| August | 121 | 43 |
| September | 342 | 12 |
| October | 709 | 0 |
| November | 1,041 | 0 |
| December | 1,491 | 0 |
| Year (annual) | 10,148 | 147 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00170200. 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.
How does Allagash's climate compare?
Allagash is warmer than 0 of the 42 places with their own NOAA record in Maine, and wetter than 0. Across the 7,247 U.S. stations with normals, its annual mean of 37.4°F is warmer than 3%.
In the Köppen classification computed from these normals, Allagash 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.
Questions about Allagash's climate
What is the coldest month at Allagash?
January, with a normal high of 20°F and a normal low of −6°F. The warmest is July (77°F by day, 52°F at night).
Does it snow at Allagash?
Yes: 100 inches in a normal year, falling on 40 days with 0.1 inch or more, the most in December (24.0 inches).
What is the rainiest month at Allagash?
July, with 4.25 in of precipitation in a normal year; the driest is February with 1.97 in.
What plant hardiness zone is Allagash in?
The USDA's 2023 map puts Allagash in zone 4b in ZIP code 04774, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches −35°F (19 years, 1991-2020): zone 3a.
How late can frost come at Allagash?
In half of years the last 32°F night comes after June 2; in one year in ten it comes after June 21. Waiting until June 21 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Maine climateThe statewide normals and every place in the state
- Fort Kent, ME22 miles from this station, 37.8°F a year
- Frenchville Aroostook Airport, ME36 miles from this station, 40.1°F a year
- Clayton Lake, ME40 miles from this station, 37.5°F a year
- Caribou, ME50 miles from this station, 40.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made