Tenants Harbor, Maine climate: Climate normals at a NOAA weather station
Tenants Harbor's normal year runs from 17°F January nights to 74°F August afternoons, with 47.6 inches of precipitation and 53 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 8.0°C, January lows of −8°C, August highs of 23°C, 1,209 mm of precipitation a year.
- NOAA stationTenants Harbor
- Station IDUSC00176881
- Location43.99°N 69.22°W
- Elevation21 ft (6 m)
On October 23, the normal high in Tenants Harbor is 56°F and the normal low 41°F, and the chance of measurable rain or snow is 37%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Tenants Harbor.
- Jan 35° 17°
- Feb 37° 19°
- Mar 43° 25°
- Apr 51° 34°
- May 61° 43°
- Jun 69° 50°
- Jul 74° 56°
- Aug 74° 57°
- Sep 68° 52°
- Oct 59° 43°
- Nov 49° 34°
- Dec 41° 24°
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 Tenants Harbor each month?
August is the warmest month, with normal highs of 74°F; January the coldest, with normal lows of 17°F. The most precipitation falls in December (4.83 in), the least in August (2.85 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 35°F | 17°F | 26.3°F | 4.01 | 15.1 | 11 | <1 | 28 | 9 h 10 min |
| February | 37°F | 19°F | 27.9°F | 3.49 | 13.9 | 10 | <1 | 25 | 10 h 30 min |
| March | 43°F | 25°F | 33.9°F | 4.50 | 8.4 | 11 | <1 | 24 | 11 h 50 min |
| April | 51°F | 34°F | 42.7°F | 4.25 | 2.3 | 12 | <1 | 10 | 13 h 20 min |
| May | 61°F | 43°F | 51.7°F | 3.53 | 0.0 | 13 | <1 | <1 | 14 h 40 min |
| June | 69°F | 50°F | 59.4°F | 3.83 | 0.0 | 12 | <1 | <1 | 15 h 30 min |
| July | 74°F | 56°F | 65.2°F | 3.08 | 0.0 | 12 | <1 | <1 | 15 h 10 min |
| August | 74°F | 57°F | 65.3°F | 2.85 | 0.0 | 10 | <1 | <1 | 14 h |
| September | 68°F | 52°F | 59.8°F | 4.01 | 0.0 | 10 | <1 | <1 | 12 h 40 min |
| October | 59°F | 43°F | 50.6°F | 4.71 | 0.1 | 11 | <1 | 1 | 11 h 10 min |
| November | 49°F | 34°F | 41.4°F | 4.51 | 2.0 | 11 | <1 | 12 | 9 h 40 min |
| December | 41°F | 24°F | 32.5°F | 4.83 | 11.3 | 13 | <1 | 24 | 9 h |
| Year (annual) | 55°F | 38°F | 46.4°F | 47.60 | 53.1 | 136 | <1 | 124 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 2°C | −8°C | −3.2°C | 102 mm | 38 cm |
| February | 3°C | −7°C | −2.3°C | 89 mm | 35 cm |
| March | 6°C | −4°C | 1.1°C | 114 mm | 21 cm |
| April | 11°C | 1°C | 5.9°C | 108 mm | 6 cm |
| May | 16°C | 6°C | 10.9°C | 90 mm | 0 cm |
| June | 20°C | 10°C | 15.2°C | 97 mm | 0 cm |
| July | 23°C | 13°C | 18.4°C | 78 mm | 0 cm |
| August | 23°C | 14°C | 18.5°C | 72 mm | 0 cm |
| September | 20°C | 11°C | 15.4°C | 102 mm | 0 cm |
| October | 15°C | 6°C | 10.3°C | 120 mm | 0 cm |
| November | 10°C | 1°C | 5.2°C | 115 mm | 5 cm |
| December | 5°C | −4°C | 0.3°C | 123 mm | 29 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00176881; 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 Tenants Harbor?
Normal highs sit between 65°F and 85°F in June, July, August and September. Of those, August 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 USC00176881.
When is the last frost at Tenants Harbor?
In Tenants Harbor, the last spring frost (32°F) comes after April 27 in half of years and after May 8 in one year in ten; the first autumn frost comes before October 25 in half of years and before October 10 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
- April 271 year in 10 after May 8; 9 in 10 after April 17
- First autumn frost, half of years before
- October 251 year in 10 before October 10; 9 in 10 before November 6
NOAA puts the median frost-free season at 178 days, and the season without a hard freeze (28°F) at 205 days.
A hard freeze (28°F) comes after April 14 in half of springs and before November 6 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Tenants Harbor in zone 6a in ZIP code 04563, 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 6b: the coldest night of a typical year reaches −4°F (25 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 USC00176881; 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 Tenants Harbor?
In a normal year in Tenants Harbor, a 90°F day is rare, 124 nights fall to 32°F or colder and 136 days bring measurable precipitation.
- Days at 90°F or more
- fewer than 1a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 124a normal year
- Days that stay below freezing
- 35high of 32°F or less
- Days with 0.01 inch of precipitation
- 136a normal year
- Days with 1 inch of snow or more
- 15a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00176881.
How sunny is it at Tenants Harbor?
Over a year 73% of the sunlight that would reach the ground under clear skies gets through the clouds at Tenants Harbor, 3.8 kWh per square metre a day. August is the sunniest month (81%) and December the cloudiest (62%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 64% | 1.6 |
| February | 69% | 2.5 |
| March | 70% | 3.7 |
| April | 70% | 4.8 |
| May | 70% | 5.5 |
| June | 72% | 5.8 |
| July | 79% | 6.0 |
| August | 81% | 5.5 |
| September | 80% | 4.4 |
| October | 71% | 2.8 |
| November | 67% | 1.8 |
| 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 Tenants Harbor record?
A normal year at Tenants Harbor brings 6,877 heating degree days, 28% more than the median U.S. place (5,373), and 122 cooling degree days, 87% 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 1,712 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,200 | 0 |
| February | 1,039 | 0 |
| March | 963 | 0 |
| April | 671 | 0 |
| May | 415 | 1 |
| June | 176 | 9 |
| July | 48 | 52 |
| August | 38 | 47 |
| September | 166 | 11 |
| October | 448 | 0 |
| November | 708 | 0 |
| December | 1,008 | 0 |
| Year (annual) | 6,877 | 122 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00176881. 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 Tenants Harbor's climate compare?
Tenants Harbor is warmer than 38 of the 42 places with their own NOAA record in Maine, and wetter than 23. Across the 7,247 U.S. stations with normals, its annual mean of 46.4°F is warmer than 25%.
In the Köppen classification computed from these normals, Tenants Harbor 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 Tenants Harbor share this climate record?
Thomaston has no NOAA station with 1991-2020 normals of its 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.
- Thomaston, ME2,751 people · 6 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 Tenants Harbor's climate
What is the coldest month at Tenants Harbor?
January, with a normal high of 35°F and a normal low of 17°F. The warmest is August (74°F by day, 57°F at night).
Does it snow at Tenants Harbor?
Yes: 53 inches in a normal year, falling on 20 days with 0.1 inch or more, the most in January (15.1 inches).
What is the rainiest month at Tenants Harbor?
December, with 4.83 in of precipitation in a normal year; the driest is August with 2.85 in.
What plant hardiness zone is Tenants Harbor in?
The USDA's 2023 map puts Tenants Harbor in zone 6a in ZIP code 04563, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches −4°F (25 years, 1991-2020): zone 6b.
How late can frost come at Tenants Harbor?
In half of years the last 32°F night comes after April 27; in one year in ten it comes after May 8. Waiting until May 8 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Maine climateThe statewide normals and every place in the state
- West Rockport (1 mi NNW), ME14 miles from this station, 45.5°F a year
- Newcastle, ME16 miles from this station, 46.4°F a year
- Wiscasset, ME25 miles from this station, 45.9°F a year
- Westport Island, ME25 miles from this station, 46.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made