Grand Lake Stream, Maine climate: Climate normals at a NOAA weather station
Grand Lake Stream's normal year runs from 9°F January nights to 78°F July afternoons, with 45.6 inches of precipitation and 74 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 6.7°C, January lows of −13°C, July highs of 26°C, 1,160 mm of precipitation a year.
- NOAA stationGrand Lake Stream
- Station IDUSC00173261
- Location45.18°N 67.77°W
- Elevation290 ft (88 m)
On October 23, the normal high in Grand Lake Stream is 54°F and the normal low 35°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 Grand Lake Stream.
- Jan 27° 9°
- Feb 30° 10°
- Mar 39° 20°
- Apr 51° 32°
- May 64° 42°
- Jun 73° 52°
- Jul 78° 58°
- Aug 78° 56°
- Sep 70° 49°
- Oct 57° 38°
- Nov 45° 29°
- Dec 33° 18°
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 Grand Lake Stream each month?
July is the warmest month, with normal highs of 78°F; January the coldest, with normal lows of 9°F. The most precipitation falls in October (5.05 in), the least in August (2.77 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 27°F | 9°F | 18.0°F | 3.77 | 17.8 | 11 | <1 | 31 | 9 h 10 min |
| February | 30°F | 10°F | 20.1°F | 3.28 | 19.9 | 10 | <1 | 28 | 10 h 20 min |
| March | 39°F | 20°F | 29.5°F | 3.98 | 13.4 | 11 | <1 | 29 | 11 h 50 min |
| April | 51°F | 32°F | 41.2°F | 3.63 | 3.5 | 11 | <1 | 21 | 13 h 30 min |
| May | 64°F | 42°F | 52.9°F | 3.33 | 0.2 | 11 | <1 | 5 | 14 h 50 min |
| June | 73°F | 52°F | 62.1°F | 3.67 | 0.0 | 12 | 1 | <1 | 15 h 40 min |
| July | 78°F | 58°F | 68.0°F | 3.29 | 0.0 | 11 | 1 | <1 | 15 h 20 min |
| August | 78°F | 56°F | 67.0°F | 2.77 | 0.0 | 9 | 1 | <1 | 14 h 10 min |
| September | 70°F | 49°F | 59.4°F | 3.54 | 0.0 | 9 | 1 | 1 | 12 h 40 min |
| October | 57°F | 38°F | 47.4°F | 5.05 | 0.1 | 11 | <1 | 12 | 11 h |
| November | 45°F | 29°F | 36.6°F | 4.41 | 2.7 | 11 | <1 | 24 | 9 h 30 min |
| December | 33°F | 18°F | 25.8°F | 4.93 | 16.6 | 12 | <1 | 30 | 8 h 50 min |
| Year (annual) | 54°F | 34°F | 44.0°F | 45.65 | 74.2 | 129 | 4 | 181 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −3°C | −13°C | −7.8°C | 96 mm | 45 cm |
| February | −1°C | −12°C | −6.6°C | 83 mm | 51 cm |
| March | 4°C | −6°C | −1.4°C | 101 mm | 34 cm |
| April | 10°C | 0°C | 5.1°C | 92 mm | 9 cm |
| May | 18°C | 6°C | 11.6°C | 85 mm | 1 cm |
| June | 23°C | 11°C | 16.7°C | 93 mm | 0 cm |
| July | 26°C | 14°C | 20.0°C | 84 mm | 0 cm |
| August | 25°C | 14°C | 19.4°C | 70 mm | 0 cm |
| September | 21°C | 9°C | 15.2°C | 90 mm | 0 cm |
| October | 14°C | 3°C | 8.6°C | 128 mm | 0 cm |
| November | 7°C | −2°C | 2.6°C | 112 mm | 7 cm |
| December | 1°C | −8°C | −3.4°C | 125 mm | 42 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00173261; 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 Grand Lake Stream?
Normal highs sit between 65°F and 85°F in June, July, August and September. Of those, August has the fewest days with rain (9).
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 USC00173261.
When is the last frost at Grand Lake Stream?
In Grand Lake Stream, the last spring frost (32°F) comes after May 4 in half of years and after May 18 in one year in ten; the first autumn frost comes before October 10 in half of years and before October 1 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 41 year in 10 after May 18; 9 in 10 after April 24
- First autumn frost, half of years before
- October 101 year in 10 before October 1; 9 in 10 before October 23
NOAA puts the median frost-free season at 157 days, and the season without a hard freeze (28°F) at 182 days.
A hard freeze (28°F) comes after April 24 in half of springs and before October 24 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Grand Lake Stream in zone 5b in ZIP code 04668, 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 5b: the coldest night of a typical year reaches −14°F (25 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 USC00173261; 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 Grand Lake Stream?
In a normal year in Grand Lake Stream, 4 days a year reach 90°F, 181 nights fall to 32°F or colder and 129 days bring measurable precipitation.
- Days at 90°F or more
- 4a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 181a normal year
- Days that stay below freezing
- 57high of 32°F or less
- Days with 0.01 inch of precipitation
- 129a normal year
- Days with 1 inch of snow or more
- 17a normal year
The highest temperature in this station's record (since 1961) is 101°F, on June 17, 1988; the lowest is −32°F, on February 2, 1962.
The wettest calendar year on that record is 1979, with 63.18 in; the snowiest season is 2010–11, with 122.1 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00173261; records: ACIS (NOAA Regional Climate Centers), station USC00173261. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Grand Lake Stream?
Over a year 68% of the sunlight that would reach the ground under clear skies gets through the clouds at Grand Lake Stream, 3.5 kWh per square metre a day. September is the sunniest month (74%) and December the cloudiest (60%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 66% | 1.5 |
| February | 67% | 2.4 |
| March | 67% | 3.5 |
| April | 65% | 4.4 |
| May | 65% | 5.1 |
| June | 67% | 5.5 |
| July | 72% | 5.6 |
| August | 74% | 5.0 |
| September | 74% | 4.0 |
| October | 66% | 2.5 |
| November | 61% | 1.5 |
| 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 Grand Lake Stream record?
A normal year at Grand Lake Stream brings 7,915 heating degree days, 47% more than the median U.S. place (5,373), and 298 cooling degree days, 67% 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 1,963 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,457 | 0 |
| February | 1,256 | 0 |
| March | 1,101 | 0 |
| April | 714 | 0 |
| May | 380 | 6 |
| June | 127 | 41 |
| July | 31 | 123 |
| August | 38 | 100 |
| September | 195 | 27 |
| October | 548 | 1 |
| November | 854 | 0 |
| December | 1,215 | 0 |
| Year (annual) | 7,915 | 298 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00173261. 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 Grand Lake Stream been warmer than normal?
2025 averaged 43.6°F, 0.4°F below the 1991-2020 normal of 44.0°F. 1 of the 2 complete years since 2023 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2023 | 46.3°F | +2.3°F | – | – |
| 2025 | 43.6°F | −0.4°F | 42.52 | 56.6 |
Over 35 complete years from 1962 to 2025, the station's annual mean temperature rose at a fitted 5.4°F per century (+0.30°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00173261; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Grand Lake Stream's climate compare?
Grand Lake Stream is warmer than 20 of the 42 places with their own NOAA record in Maine, and wetter than 20. Across the 7,247 U.S. stations with normals, its annual mean of 44.0°F is warmer than 15%.
In the Köppen classification computed from these normals, Grand Lake Stream 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 Grand Lake Stream's climate
What is the coldest month at Grand Lake Stream?
January, with a normal high of 27°F and a normal low of 9°F. The warmest is July (78°F by day, 58°F at night).
Does it snow at Grand Lake Stream?
Yes: 74 inches in a normal year, falling on 26 days with 0.1 inch or more, the most in February (19.9 inches).
What is the rainiest month at Grand Lake Stream?
October, with 5.05 in of precipitation in a normal year; the driest is August with 2.77 in.
What plant hardiness zone is Grand Lake Stream in?
The USDA's 2023 map puts Grand Lake Stream in zone 5b in ZIP code 04668, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches −14°F (25 years, 1991-2020): zone 5b.
How late can frost come at Grand Lake Stream?
In half of years the last 32°F night comes after May 4; in one year in ten it comes after May 18. Waiting until May 18 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Maine climateThe statewide normals and every place in the state
- Wesley, ME17 miles from this station, 44.3°F a year
- Topsfield 2, ME18 miles from this station, 42.9°F a year
- Woodland, ME19 miles from this station, 46.6°F a year
- Vanceboro, ME31 miles from this station, 42.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made