Middle Dam, Maine climate: Climate normals at a NOAA weather station
Middle Dam's normal year runs from 2°F January nights to 76°F July afternoons, with 40.8 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 4.6°C, January lows of −16°C, July highs of 25°C, 1,037 mm of precipitation a year.
- NOAA stationMiddle Dam
- Station IDUSC00175261
- Location44.78°N 70.92°W
- Elevation1,460 ft (445 m)
On October 22, the normal high in Middle Dam is 52°F and the normal low 32°F, and the chance of measurable rain or snow is 47%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Middle Dam.
- Jan 24° 2°
- Feb 27° 3°
- Mar 36° 12°
- Apr 48° 27°
- May 62° 39°
- Jun 71° 49°
- Jul 76° 54°
- Aug 75° 53°
- Sep 68° 45°
- Oct 54° 34°
- Nov 41° 24°
- Dec 30° 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 Middle Dam each month?
July is the warmest month, with normal highs of 76°F; January the coldest, with normal lows of 2°F. The most precipitation falls in October (4.63 in), the least in February (2.27 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 24°F | 2°F | 13.4°F | 2.49 | 17 | <1 | 31 | 9 h 10 min |
| February | 27°F | 3°F | 15.1°F | 2.27 | 14 | <1 | 28 | 10 h 20 min |
| March | 36°F | 12°F | 24.2°F | 2.64 | 15 | <1 | 30 | 11 h 50 min |
| April | 48°F | 27°F | 37.3°F | 3.24 | 13 | <1 | 24 | 13 h 30 min |
| May | 62°F | 39°F | 50.3°F | 3.69 | 15 | <1 | 7 | 14 h 50 min |
| June | 71°F | 49°F | 60.1°F | 4.20 | 15 | 1 | <1 | 15 h 30 min |
| July | 76°F | 54°F | 65.2°F | 4.01 | 15 | <1 | <1 | 15 h 20 min |
| August | 75°F | 53°F | 63.9°F | 3.80 | 13 | <1 | <1 | 14 h 10 min |
| September | 68°F | 45°F | 56.3°F | 3.22 | 13 | <1 | 2 | 12 h 40 min |
| October | 54°F | 34°F | 44.2°F | 4.63 | 14 | <1 | 15 | 11 h |
| November | 41°F | 24°F | 32.8°F | 3.18 | 15 | <1 | 25 | 9 h 40 min |
| December | 30°F | 12°F | 21.3°F | 3.47 | 18 | <1 | 30 | 8 h 50 min |
| Year (annual) | 51°F | 30°F | 40.3°F | 40.84 | 178 | 1 | 191 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | −4°C | −16°C | −10.3°C | 63 mm |
| February | −3°C | −16°C | −9.4°C | 58 mm |
| March | 2°C | −11°C | −4.3°C | 67 mm |
| April | 9°C | −3°C | 2.9°C | 82 mm |
| May | 16°C | 4°C | 10.2°C | 94 mm |
| June | 22°C | 10°C | 15.6°C | 107 mm |
| July | 25°C | 12°C | 18.4°C | 102 mm |
| August | 24°C | 11°C | 17.7°C | 97 mm |
| September | 20°C | 7°C | 13.5°C | 82 mm |
| October | 12°C | 1°C | 6.8°C | 118 mm |
| November | 5°C | −4°C | 0.4°C | 81 mm |
| December | −1°C | −11°C | −5.9°C | 88 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Andover 2 (11 miles away), gets 112 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00175261; 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 Middle 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 (13).
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 USC00175261.
When is the last frost at Middle Dam?
In Middle Dam, the last spring frost (32°F) comes after May 19 in half of years and after May 31 in one year in ten; the first autumn frost comes before October 1 in half of years and before September 19 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 191 year in 10 after May 31; 9 in 10 after May 5
- First autumn frost, half of years before
- October 11 year in 10 before September 19; 9 in 10 before October 13
NOAA puts the median frost-free season at 133 days, and the season without a hard freeze (28°F) at 158 days.
A hard freeze (28°F) comes after May 5 in half of springs and before October 11 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Middle Dam in zone 4b in ZIP code 04216, 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 −23°F (22 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 USC00175261; 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 Middle Dam?
In a normal year in Middle Dam, 1 day a year reaches 90°F, 191 nights fall to 32°F or colder and 178 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
- 178a normal year
The highest temperature in this station's record (since 1926) is 96°F, on August 3, 1975; the lowest is −34°F, on January 19, 1976.
The wettest calendar year on that record is 2005, with 52.96 in; the snowiest season is 2000–01, with 130.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00175261; records: ACIS (NOAA Regional Climate Centers), station USC00175261. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Middle Dam?
Over a year 69% of the sunlight that would reach the ground under clear skies gets through the clouds at Middle Dam, 3.6 kWh per square metre a day. September is the sunniest month (76%) and December the cloudiest (60%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 64% | 1.6 |
| February | 67% | 2.5 |
| March | 69% | 3.6 |
| April | 67% | 4.6 |
| May | 66% | 5.2 |
| June | 68% | 5.6 |
| July | 74% | 5.7 |
| August | 76% | 5.2 |
| September | 76% | 4.2 |
| October | 66% | 2.6 |
| November | 64% | 1.7 |
| December | 60% | 1.2 |
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 Middle Dam record?
A normal year at Middle Dam brings 9,111 heating degree days, 70% 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 1,572 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,601 | 0 |
| February | 1,397 | 0 |
| March | 1,265 | 0 |
| April | 831 | 0 |
| May | 460 | 3 |
| June | 174 | 29 |
| July | 63 | 69 |
| August | 86 | 51 |
| September | 272 | 13 |
| October | 643 | 0 |
| November | 965 | 0 |
| December | 1,353 | 0 |
| Year (annual) | 9,111 | 164 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00175261. 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 Middle Dam's climate compare?
Middle Dam is warmer than 4 of the 42 places with their own NOAA record in Maine, and wetter than 3. Across the 7,247 U.S. stations with normals, its annual mean of 40.3°F is warmer than 6%.
In the Köppen classification computed from these normals, Middle 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 Middle Dam's climate
What is the coldest month at Middle Dam?
January, with a normal high of 24°F and a normal low of 2°F. The warmest is July (76°F by day, 54°F at night).
Does it snow at Middle Dam?
Yes. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Andover 2 (11 miles away), records 112 inches of snow in a normal year.
What is the rainiest month at Middle Dam?
October, with 4.63 in of precipitation in a normal year; the driest is February with 2.27 in.
What plant hardiness zone is Middle Dam in?
The USDA's 2023 map puts Middle Dam in zone 4b in ZIP code 04216, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches −23°F (22 years, 1991-2020): zone 4b.
How late can frost come at Middle Dam?
In half of years the last 32°F night comes after May 19; in one year in ten it comes after May 31. Waiting until May 31 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Maine climateThe statewide normals and every place in the state
- Andover 2, ME11 miles from this station, 40.8°F a year
- Errol Airport, NH12 miles from this station, 39.5°F a year
- Berlin, NH19 miles from this station, 41.4°F a year
- Rangeley, ME19 miles from this station, 39.3°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made