Hollis, Maine climate: Climate normals at a NOAA weather station
Hollis's normal year runs from 8°F January nights to 80°F July afternoons, with 52.1 inches of precipitation and 81 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 27°C, 1,324 mm of precipitation a year.
- NOAA stationHollis
- Station IDUSC00173862
- Location43.65°N 70.67°W
- Elevation304 ft (93 m)
On October 23, the normal high in Hollis is 55°F and the normal low 33°F, and the chance of measurable rain or snow is 39%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Hollis.
- Jan 29° 8°
- Feb 33° 9°
- Mar 41° 19°
- Apr 54° 30°
- May 66° 41°
- Jun 75° 51°
- Jul 80° 57°
- Aug 79° 54°
- Sep 71° 46°
- Oct 58° 35°
- Nov 46° 26°
- Dec 35° 16°
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 Hollis each month?
July is the warmest month, with normal highs of 80°F; January the coldest, with normal lows of 8°F. The most precipitation falls in October (5.75 in), the least in January (3.58 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 29°F | 8°F | 18.6°F | 3.58 | 19.8 | 12 | <1 | 31 | 9 h 20 min |
| February | 33°F | 9°F | 20.8°F | 3.63 | 20.4 | 10 | <1 | 28 | 10 h 30 min |
| March | 41°F | 19°F | 29.8°F | 4.57 | 15.4 | 11 | <1 | 29 | 11 h 50 min |
| April | 54°F | 30°F | 41.7°F | 4.86 | 3.7 | 12 | <1 | 21 | 13 h 20 min |
| May | 66°F | 41°F | 53.3°F | 3.94 | 0.1 | 14 | 1 | 6 | 14 h 40 min |
| June | 75°F | 51°F | 62.8°F | 4.45 | 0.0 | 14 | 2 | <1 | 15 h 20 min |
| July | 80°F | 57°F | 68.4°F | 4.12 | 0.0 | 12 | 3 | <1 | 15 h 10 min |
| August | 79°F | 54°F | 66.5°F | 3.83 | 0.0 | 10 | 2 | <1 | 14 h |
| September | 71°F | 46°F | 58.2°F | 4.02 | 0.0 | 9 | 1 | 2 | 12 h 30 min |
| October | 58°F | 35°F | 46.4°F | 5.75 | 0.4 | 12 | <1 | 14 | 11 h 10 min |
| November | 46°F | 26°F | 35.7°F | 4.47 | 3.4 | 12 | <1 | 24 | 9 h 40 min |
| December | 35°F | 16°F | 25.4°F | 4.89 | 17.7 | 12 | <1 | 30 | 9 h |
| Year (annual) | 56°F | 33°F | 44.0°F | 52.11 | 80.9 | 138 | 7 | 184 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −1°C | −13°C | −7.4°C | 91 mm | 50 cm |
| February | 0°C | −13°C | −6.2°C | 92 mm | 52 cm |
| March | 5°C | −7°C | −1.2°C | 116 mm | 39 cm |
| April | 12°C | −1°C | 5.4°C | 123 mm | 9 cm |
| May | 19°C | 5°C | 11.8°C | 100 mm | 0 cm |
| June | 24°C | 10°C | 17.1°C | 113 mm | 0 cm |
| July | 27°C | 14°C | 20.2°C | 105 mm | 0 cm |
| August | 26°C | 12°C | 19.2°C | 97 mm | 0 cm |
| September | 21°C | 8°C | 14.6°C | 102 mm | 0 cm |
| October | 14°C | 2°C | 8.0°C | 146 mm | 1 cm |
| November | 8°C | −3°C | 2.1°C | 114 mm | 9 cm |
| December | 2°C | −9°C | −3.7°C | 124 mm | 45 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00173862; 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 Hollis?
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 (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 USC00173862.
When is the last frost at Hollis?
In Hollis, the last spring frost (32°F) comes after May 14 in half of years and after May 28 in one year in ten; the first autumn frost comes before September 30 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 141 year in 10 after May 28; 9 in 10 after May 3
- First autumn frost, half of years before
- September 301 year in 10 before September 16; 9 in 10 before October 12
NOAA puts the median frost-free season at 136 days, and the season without a hard freeze (28°F) at 159 days.
A hard freeze (28°F) comes after May 3 in half of springs and before October 10 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Hollis in zone 5b in ZIP code 04030, 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 −17°F (26 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 USC00173862; 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 Hollis?
In a normal year in Hollis, 7 days a year reach 90°F, 184 nights fall to 32°F or colder and 138 days bring measurable precipitation.
- Days at 90°F or more
- 7a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 184a normal year
- Days that stay below freezing
- 50high of 32°F or less
- Days with 0.01 inch of precipitation
- 138a normal year
- Days with 1 inch of snow or more
- 19a normal year
The highest temperature in this station's record (since 1994) is 99°F, on June 25, 2025; the lowest is −28°F, on January 1, 2018.
The wettest calendar year on that record is 2005, with 74.96 in; the snowiest season is 2007–08, with 129.9 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00173862; records: ACIS (NOAA Regional Climate Centers), station USC00173862. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Hollis?
Over a year 72% of the sunlight that would reach the ground under clear skies gets through the clouds at Hollis, 3.8 kWh per square metre a day. August is the sunniest month (79%) and December the cloudiest (64%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 67% | 1.7 |
| February | 69% | 2.5 |
| March | 69% | 3.6 |
| April | 70% | 4.7 |
| May | 69% | 5.3 |
| June | 70% | 5.6 |
| July | 77% | 5.9 |
| August | 79% | 5.3 |
| September | 78% | 4.3 |
| October | 70% | 2.8 |
| November | 68% | 1.8 |
| December | 64% | 1.4 |
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 Hollis record?
A normal year at Hollis brings 7,944 heating degree days, 48% more than the median U.S. place (5,373), and 313 cooling degree days, 66% 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 1,960 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,438 | 0 |
| February | 1,239 | 0 |
| March | 1,091 | 0 |
| April | 700 | 1 |
| May | 373 | 9 |
| June | 122 | 56 |
| July | 26 | 131 |
| August | 47 | 92 |
| September | 227 | 24 |
| October | 577 | 1 |
| November | 878 | 0 |
| December | 1,228 | 0 |
| Year (annual) | 7,944 | 313 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00173862. 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 Hollis been warmer than normal?
2025 averaged 44.1°F, 0.1°F above the 1991-2020 normal of 44.0°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 46.0°F | +2.0°F | 51.10 | 45.3 |
| 2022 | 45.2°F | +1.2°F | 55.42 | 48.0 |
| 2023 | 46.2°F | +2.2°F | 64.67 | 84.5 |
| 2024 | 46.5°F | +2.5°F | 51.05 | 72.3 |
| 2025 | 44.1°F | +0.1°F | 43.39 | 71.4 |
Source: observed years: ACIS, station USC00173862. A year counts only with all twelve months complete.
How does Hollis's climate compare?
Hollis is warmer than 20 of the 42 places with their own NOAA record in Maine, and wetter than 40. 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, Hollis 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 Hollis share this climate record?
Lake Arrowhead 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.
- Lake Arrowhead, ME3,273 people · 3 mi W
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 Hollis's climate
What is the coldest month at Hollis?
January, with a normal high of 29°F and a normal low of 8°F. The warmest is July (80°F by day, 57°F at night).
Does it snow at Hollis?
Yes: 81 inches in a normal year, falling on 33 days with 0.1 inch or more, the most in February (20.4 inches).
What is the rainiest month at Hollis?
October, with 5.75 in of precipitation in a normal year; the driest is January with 3.58 in.
What plant hardiness zone is Hollis in?
The USDA's 2023 map puts Hollis in zone 5b in ZIP code 04030, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches −17°F (26 years, 1991-2020): zone 5a.
How late can frost come at Hollis?
In half of years the last 32°F night comes after May 14; in one year in ten it comes after May 28. Waiting until May 28 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 Buxton (2 mi NNW), ME4 miles from this station, 45.6°F a year
- Sanford, ME14 miles from this station, 45.5°F a year
- East Hiram, ME16 miles from this station, 43.4°F a year
- Windham (2 mi NW), ME18 miles from this station, 45.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made