Brassua Dam, Maine climate: Climate normals at a NOAA weather station
Brassua Dam's normal year runs from 1°F January nights to 76°F July afternoons, with 43.3 inches of precipitation and 108 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 4.2°C, January lows of −17°C, July highs of 24°C, 1,099 mm of precipitation a year.
- NOAA stationBrassua Dam
- Station IDUSC00170814
- Location45.66°N 69.81°W
- Elevation1,069 ft (326 m)
On October 23, the normal high in Brassua Dam is 50°F and the normal low 32°F, and the chance of measurable rain or snow is 44%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Brassua Dam.
- Jan 22° 1°
- Feb 25° 1°
- Mar 35° 11°
- Apr 47° 26°
- May 62° 38°
- Jun 71° 49°
- Jul 76° 55°
- Aug 75° 53°
- Sep 67° 45°
- Oct 53° 35°
- Nov 40° 25°
- Dec 29° 12°
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 Brassua Dam each month?
July is the warmest month, with normal highs of 76°F; January the coldest, with normal lows of 1°F. The most precipitation falls in June (4.69 in), the least in February (2.45 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 22°F | 1°F | 11.7°F | 2.70 | 22.0 | 12 | <1 | 31 | 9 h |
| February | 25°F | 1°F | 12.8°F | 2.45 | 24.0 | 10 | <1 | 28 | 10 h 20 min |
| March | 35°F | 11°F | 22.8°F | 2.92 | 20.6 | 11 | <1 | 30 | 11 h 50 min |
| April | 47°F | 26°F | 36.4°F | 3.57 | 6.9 | 12 | <1 | 25 | 13 h 30 min |
| May | 62°F | 38°F | 49.8°F | 3.68 | 0.3 | 14 | <1 | 8 | 14 h 50 min |
| June | 71°F | 49°F | 59.9°F | 4.69 | 0.0 | 15 | <1 | <1 | 15 h 40 min |
| July | 76°F | 55°F | 65.2°F | 4.33 | 0.0 | 15 | <1 | <1 | 15 h 20 min |
| August | 75°F | 53°F | 63.9°F | 3.83 | 0.0 | 13 | <1 | <1 | 14 h 10 min |
| September | 67°F | 45°F | 56.2°F | 3.42 | 0.0 | 11 | <1 | 2 | 12 h 40 min |
| October | 53°F | 35°F | 43.9°F | 4.57 | 1.8 | 14 | <1 | 13 | 11 h |
| November | 40°F | 25°F | 32.4°F | 3.49 | 7.4 | 13 | <1 | 24 | 9 h 30 min |
| December | 29°F | 12°F | 20.3°F | 3.60 | 24.7 | 14 | <1 | 30 | 8 h 40 min |
| Year (annual) | 50°F | 29°F | 39.6°F | 43.25 | 107.7 | 152 | 1 | 192 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −5°C | −17°C | −11.3°C | 69 mm | 56 cm |
| February | −4°C | −17°C | −10.7°C | 62 mm | 61 cm |
| March | 2°C | −12°C | −5.1°C | 74 mm | 52 cm |
| April | 8°C | −4°C | 2.4°C | 91 mm | 18 cm |
| May | 16°C | 3°C | 9.9°C | 93 mm | 1 cm |
| June | 22°C | 9°C | 15.5°C | 119 mm | 0 cm |
| July | 24°C | 13°C | 18.4°C | 110 mm | 0 cm |
| August | 24°C | 12°C | 17.7°C | 97 mm | 0 cm |
| September | 20°C | 7°C | 13.4°C | 87 mm | 0 cm |
| October | 12°C | 1°C | 6.6°C | 116 mm | 5 cm |
| November | 5°C | −4°C | 0.2°C | 89 mm | 19 cm |
| December | −2°C | −11°C | −6.5°C | 91 mm | 63 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00170814; 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 Brassua Dam?
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 USC00170814.
When is the last frost at Brassua Dam?
In Brassua Dam, the last spring frost (32°F) comes after May 23 in half of years and after June 4 in one year in ten; the first autumn frost comes before September 29 in half of years and before September 16 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 231 year in 10 after June 4; 9 in 10 after May 7
- First autumn frost, half of years before
- September 291 year in 10 before September 16; 9 in 10 before October 11
NOAA puts the median frost-free season at 128 days, and the season without a hard freeze (28°F) at 153 days.
A hard freeze (28°F) comes after May 9 in half of springs and before October 10 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Brassua Dam in zone 4b in ZIP code 04478, 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 4b: the coldest night of a typical year reaches −24°F (30 complete years).
Frost dates for every NOAA station in Maine · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00170814; 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 Brassua Dam?
In a normal year in Brassua Dam, 1 day a year reaches 90°F, 192 nights fall to 32°F or colder and 152 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
- 192a normal year
- Days that stay below freezing
- 86high of 32°F or less
- Days with 0.01 inch of precipitation
- 152a normal year
- Days with 1 inch of snow or more
- 27a normal year
The highest temperature in this station's record (since 1929) is 97°F, on August 3, 1975; the lowest is −39°F, on February 3, 1962.
The wettest calendar year on that record is 2023, with 56.82 in; the snowiest season is 1968–69, with 188.2 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00170814; records: ACIS (NOAA Regional Climate Centers), station USC00170814. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Brassua Dam?
Over a year 68% of the sunlight that would reach the ground under clear skies gets through the clouds at Brassua Dam, 3.5 kWh per square metre a day. September is the sunniest month (74%) and December the cloudiest (59%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 64% | 1.5 |
| February | 66% | 2.4 |
| March | 69% | 3.6 |
| April | 67% | 4.6 |
| May | 65% | 5.1 |
| June | 67% | 5.5 |
| July | 72% | 5.6 |
| August | 73% | 5.0 |
| September | 74% | 4.0 |
| October | 65% | 2.5 |
| November | 61% | 1.5 |
| December | 59% | 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 many heating and cooling degree days does Brassua Dam record?
A normal year at Brassua Dam brings 9,378 heating degree days, 75% more than the median U.S. place (5,373), and 164 cooling degree days, 82% 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 1,549 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,654 | 0 |
| February | 1,460 | 0 |
| March | 1,307 | 0 |
| April | 860 | 0 |
| May | 474 | 3 |
| June | 182 | 27 |
| July | 62 | 69 |
| August | 84 | 50 |
| September | 278 | 14 |
| October | 654 | 0 |
| November | 978 | 0 |
| December | 1,384 | 0 |
| Year (annual) | 9,378 | 164 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00170814. 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.
Have recent years at Brassua Dam been warmer than normal?
2024 averaged 42.9°F, 3.3°F above the 1991-2020 normal of 39.6°F. 3 of the 3 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 42.0°F | +2.4°F | 31.35 | 81.2 |
| 2023 | 42.1°F | +2.5°F | 56.82 | 100.8 |
| 2024 | 42.9°F | +3.3°F | 39.08 | 106.1 |
Over 57 complete years from 1962 to 2024, the station's annual mean temperature rose at a fitted 6.6°F per century (+0.37°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00170814; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Brassua Dam's climate compare?
Brassua Dam is warmer than 4 of the 42 places with their own NOAA record in Maine, and wetter than 11. Across the 7,247 U.S. stations with normals, its annual mean of 39.6°F is warmer than 5%.
In the Köppen classification computed from these normals, Brassua Dam 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 Brassua Dam's climate
What is the coldest month at Brassua Dam?
January, with a normal high of 22°F and a normal low of 1°F. The warmest is July (76°F by day, 55°F at night).
Does it snow at Brassua Dam?
Yes: 108 inches in a normal year, falling on 47 days with 0.1 inch or more, the most in December (24.7 inches).
What is the rainiest month at Brassua Dam?
June, with 4.69 in of precipitation in a normal year; the driest is February with 2.45 in.
What plant hardiness zone is Brassua Dam in?
The USDA's 2023 map puts Brassua Dam in zone 4b in ZIP code 04478, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches −24°F (30 years, 1991-2020): zone 4b.
How late can frost come at Brassua Dam?
In half of years the last 32°F night comes after May 23; in one year in ten it comes after June 4. Waiting until June 4 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Maine climateThe statewide normals and every place in the state
- Moosehead, ME7 miles from this station, 40.1°F a year
- Greenville, ME17 miles from this station, 41.1°F a year
- Pittston Farm, ME18 miles from this station, 38.8°F a year
- Jackman, ME21 miles from this station, 39.2°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made