Harmony, Maine climate: Climate normals at a NOAA weather station
Harmony's normal year runs from 3°F January nights to 81°F July afternoons, with 44.6 inches of precipitation and 79 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 6.3°C, January lows of −16°C, July highs of 27°C, 1,134 mm of precipitation a year.
- NOAA stationHarmony
- Station IDUSC00173567
- Location44.95°N 69.55°W
- Elevation320 ft (98 m)
On October 23, the normal high in Harmony is 56°F and the normal low 32°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 Harmony.
- Jan 30° 3°
- Feb 32° 3°
- Mar 41° 14°
- Apr 54° 28°
- May 67° 41°
- Jun 76° 50°
- Jul 81° 56°
- Aug 80° 54°
- Sep 73° 45°
- Oct 59° 35°
- Nov 46° 25°
- Dec 35° 13°
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 Harmony each month?
July is the warmest month, with normal highs of 81°F; January the coldest, with normal lows of 3°F. The most precipitation falls in October (4.92 in), the least in February (2.64 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 30°F | 3°F | 16.3°F | 3.17 | 17.1 | 11 | <1 | 30 | 9 h 10 min |
| February | 32°F | 3°F | 17.7°F | 2.64 | 20.3 | 10 | <1 | 28 | 10 h 20 min |
| March | 41°F | 14°F | 27.8°F | 3.37 | 16.0 | 11 | <1 | 29 | 11 h 50 min |
| April | 54°F | 28°F | 41.3°F | 3.79 | 4.4 | 11 | <1 | 21 | 13 h 30 min |
| May | 67°F | 41°F | 53.9°F | 3.51 | 0.0 | 14 | <1 | 4 | 14 h 50 min |
| June | 76°F | 50°F | 63.1°F | 4.39 | 0.0 | 14 | 1 | <1 | 15 h 30 min |
| July | 81°F | 56°F | 68.5°F | 3.74 | 0.0 | 14 | 4 | <1 | 15 h 20 min |
| August | 80°F | 54°F | 66.9°F | 3.68 | 0.0 | 12 | 2 | <1 | 14 h 10 min |
| September | 73°F | 45°F | 59.0°F | 3.62 | 0.0 | 10 | <1 | 2 | 12 h 40 min |
| October | 59°F | 35°F | 46.9°F | 4.92 | 0.4 | 13 | <1 | 11 | 11 h |
| November | 46°F | 25°F | 35.5°F | 3.95 | 4.5 | 11 | <1 | 24 | 9 h 40 min |
| December | 35°F | 13°F | 23.8°F | 3.86 | 16.1 | 13 | <1 | 29 | 8 h 50 min |
| Year (annual) | 56°F | 31°F | 43.4°F | 44.64 | 78.8 | 142 | 8 | 178 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −1°C | −16°C | −8.7°C | 81 mm | 43 cm |
| February | 0°C | −16°C | −7.9°C | 67 mm | 52 cm |
| March | 5°C | −10°C | −2.3°C | 86 mm | 41 cm |
| April | 12°C | −2°C | 5.2°C | 96 mm | 11 cm |
| May | 20°C | 5°C | 12.2°C | 89 mm | 0 cm |
| June | 24°C | 10°C | 17.3°C | 112 mm | 0 cm |
| July | 27°C | 13°C | 20.3°C | 95 mm | 0 cm |
| August | 27°C | 12°C | 19.4°C | 93 mm | 0 cm |
| September | 23°C | 7°C | 15.0°C | 92 mm | 0 cm |
| October | 15°C | 1°C | 8.3°C | 125 mm | 1 cm |
| November | 8°C | −4°C | 1.9°C | 100 mm | 11 cm |
| December | 2°C | −11°C | −4.6°C | 98 mm | 41 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00173567; 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 Harmony?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, September has the fewest days with rain (10).
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 USC00173567.
When is the last frost at Harmony?
In Harmony, the last spring frost (32°F) comes after May 11 in half of years and after May 25 in one year in ten; the first autumn frost comes before October 1 in half of years and before September 18 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 111 year in 10 after May 25; 9 in 10 after April 30
- First autumn frost, half of years before
- October 11 year in 10 before September 18; 9 in 10 before October 13
NOAA puts the median frost-free season at 141 days, and the season without a hard freeze (28°F) at 164 days.
A hard freeze (28°F) comes after April 30 in half of springs and before October 11 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Harmony in zone 5a in ZIP code 04943, 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 5a: the coldest night of a typical year reaches −19°F (17 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 USC00173567; 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 Harmony?
In a normal year in Harmony, 8 days a year reach 90°F, 178 nights fall to 32°F or colder and 142 days bring measurable precipitation.
- Days at 90°F or more
- 8a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 178a normal year
- Days that stay below freezing
- 53high of 32°F or less
- Days with 0.01 inch of precipitation
- 142a normal year
- Days with 1 inch of snow or more
- 22a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00173567.
How sunny is it at Harmony?
Over a year 71% of the sunlight that would reach the ground under clear skies gets through the clouds at Harmony, 3.7 kWh per square metre a day. September is the sunniest month (77%) and December the cloudiest (62%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 67% | 1.7 |
| February | 69% | 2.5 |
| March | 70% | 3.7 |
| April | 68% | 4.6 |
| May | 67% | 5.3 |
| June | 68% | 5.6 |
| July | 75% | 5.8 |
| August | 77% | 5.3 |
| September | 77% | 4.2 |
| October | 68% | 2.6 |
| November | 66% | 1.7 |
| December | 62% | 1.3 |
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 Harmony record?
A normal year at Harmony brings 8,160 heating degree days, 52% more than the median U.S. place (5,373), and 316 cooling degree days, 65% 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 2,016 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,511 | 0 |
| February | 1,326 | 0 |
| March | 1,153 | 0 |
| April | 713 | 0 |
| May | 354 | 9 |
| June | 109 | 51 |
| July | 22 | 130 |
| August | 36 | 94 |
| September | 212 | 32 |
| October | 560 | 1 |
| November | 885 | 0 |
| December | 1,279 | 0 |
| Year (annual) | 8,160 | 316 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00173567. 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 Harmony been warmer than normal?
2023 averaged 46.2°F, 2.8°F above the 1991-2020 normal of 43.4°F. 3 of the 3 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 45.5°F | +2.1°F | 38.55 | 57.0 |
| 2022 | 44.7°F | +1.3°F | 49.40 | 72.5 |
| 2023 | 46.2°F | +2.8°F | 58.53 | 75.8 |
Source: observed years: ACIS, station USC00173567. A year counts only with all twelve months complete.
How does Harmony's climate compare?
Harmony is warmer than 18 of the 42 places with their own NOAA record in Maine, and wetter than 16. Across the 7,247 U.S. stations with normals, its annual mean of 43.4°F is warmer than 13%.
In the Köppen classification computed from these normals, Harmony 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 Harmony 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.
- Bingham, ME833 people · 18 mi NW
- Hartland, ME1,845 people · 6 mi SE
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 Harmony's climate
What is the coldest month at Harmony?
January, with a normal high of 30°F and a normal low of 3°F. The warmest is July (81°F by day, 56°F at night).
Does it snow at Harmony?
Yes: 79 inches in a normal year, falling on 29 days with 0.1 inch or more, the most in February (20.3 inches).
What is the rainiest month at Harmony?
October, with 4.92 in of precipitation in a normal year; the driest is February with 2.64 in.
What plant hardiness zone is Harmony in?
The USDA's 2023 map puts Harmony in zone 5a in ZIP code 04943, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches −19°F (17 years, 1991-2020): zone 5a.
How late can frost come at Harmony?
In half of years the last 32°F night comes after May 11; in one year in ten it comes after May 25. Waiting until May 25 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Maine climateThe statewide normals and every place in the state
- Corinna, ME15 miles from this station, 44.5°F a year
- East Sangerville, ME19 miles from this station, 43.3°F a year
- Madison, ME20 miles from this station, 43.1°F a year
- Dover-Foxcroft, ME24 miles from this station, 42.2°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made