Westport Island, ME Climate: Temperature & Rain by Month
Average temperature and precipitation from NOAA NCEI 1991–2020 normals →, with a derived climate comfort score
30-year climate normals (1991-2020) from Westport Island's primary NOAA station, WESTPORT ISLAND.
The climate verdict for Westport Island
Water is the standout signal in Westport Island, Maine: 51.7 inches of precipitation in a normal year. Against that wet profile, NOAA records an annual average of 46°F. At 52/100 (moderate) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 24% of scores.
- 46°F
- annual average temperature (NOAA normal)
- 52/100
- comfort score, above 24% of station-mapped location scores
- 51.7"
- precipitation, annual total
- 176 days
- growing season, frost-free days
Westport Island: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00179547 · Westport Island, ME 46°F mean · 51.7" precip
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-WET · SWING-WIDE · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 46°F
- RANK-COOL #1,578
- PHOTO-FINISH ≈ Clover Valley
- PRCP-WET 51.7"
- SWING-WIDE 45°F
- COMF-LOW 52/100
- LOAD-HEAT 7,165 HDD
- STN-1 USC00179547
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Clover Valley, NV (+ 0.1 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every ME station list.
- Westport Island (this station) 46°F
- Hot Buckhorn Mtn, CO 46°F
- Near Clover Valley, NV 46°F
- Near Ely Yelland Fld, NV 46°F
- Near Jiggs, NV 46°F
Westport Island sits in Maine, the #4 coldest U.S. state at 43.1°F statewide annual average - see all 50 coldest states ranked by NOAA normals
Climate Living Index · Westport Island
Westport Island: 39/100 · grade F
Westport Island publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Westport Island, not an official NOAA rating. Rankings still use Comfort Score 52/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Normal heat + freeze calendar | 144 calendar days | 51/100 · D |
| Frost-free season | 176 days/year | 47/100 · D |
| Precipitation balance | 51.7 in · 16.7 from 35 in | 41/100 · D |
| Annual temperature balance | 46.0°F · 21.5° from 67.5°F | 23/100 · F |
Westport Island · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Westport Island is a continental Köppen climate: Dfb
Coldest-month mean 22.7°F and warmest-month mean 67.8°F place this station in continental, no dry season, warm summer climates (Dfb). Class Dfb is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: continental, specifically continental, no dry season, warm summer.
- Köppen code
- Dfb
- Group
- Continental
- Warmest month
- 67.8°F
- Coldest month
- 22.7°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · heating-led station
Where Westport Island sits across the climate record
Three NOAA fields for Westport Island's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Cooler than 77%
- Among 6,861 stations, Westport Island sits in the cooler third of annual means.
- Annual precipitation
- Top 16% wettest
- Westport Island's annual total ranks in the wetter third of 6,352 measured normals.
- Seasonal temperature swing
- 59th percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Westport Island compares across U.S. station-mapped locations
Westport Island's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
52 24th percentile score exceeds 24% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). Below this entry.
- 50–60: 1,329 station-mapped locations (21%). This entry sits in this band.
- 60–70: 1,236 station-mapped locations (20%). Above this entry.
- 70–80: 650 station-mapped locations (11%). Above this entry.
- 80–90: 921 station-mapped locations (15%). Above this entry.
- 90–100: 564 station-mapped locations (9%). Above this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 31°F (-1°C) | 14°F (-10°C) | 23°F (-5°C) | 4.4" | 29.5 | 0.0 |
| February | 33°F (1°C) | 16°F (-9°C) | 25°F (-4°C) | 3.9" | 27.6 | 0.0 |
| March | 41°F (5°C) | 24°F (-4°C) | 32°F (0°C) | 4.9" | 26.3 | 0.0 |
| April | 51°F (11°C) | 34°F (1°C) | 43°F (6°C) | 4.3" | 12.5 | 0.0 |
| May | 63°F (17°C) | 44°F (7°C) | 53°F (12°C) | 3.6" | 0.9 | 0.1 |
| June | 70°F (21°C) | 53°F (12°C) | 62°F (17°C) | 4.4" | 0.0 | 0.1 |
| July | 76°F (25°C) | 59°F (15°C) | 68°F (20°C) | 3.7" | 0.0 | 0.3 |
| August | 76°F (24°C) | 59°F (15°C) | 67°F (20°C) | 3.2" | 0.0 | 0.1 |
| September | 69°F (21°C) | 51°F (11°C) | 60°F (16°C) | 4.3" | 0.0 | 0.2 |
| October | 58°F (14°C) | 42°F (5°C) | 50°F (10°C) | 5.2" | 5.4 | 0.0 |
| November | 47°F (8°C) | 32°F (0°C) | 40°F (4°C) | 4.3" | 18.1 | 0.0 |
| December | 37°F (3°C) | 22°F (-6°C) | 29°F (-1°C) | 5.4" | 27.9 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 77°F around July 20, short of 90°F on every date, while 144 dates carry a normal low at or below freezing, the coldest 13°F near January 24.
The freezing stretch
The normal low stays at or below 32°F into April 8, then returns to freezing around November 17, covering 144 dates in all.
Derived from the normal daily minimum. This is a different measure from the 50%-probability frost dates shown elsewhere on this page, which come from NOAA’s frost product.
Where the wet dates fall
The likeliest wet date is June 5, when 52% of years recorded at least a hundredth of an inch. The driest is September 6 at 30%. Summed across the calendar, that is about 149 wet dates a year.
The widest day
May 4 carries the biggest normal gap between afternoon and dawn, 19°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Westport Island.
Where Westport Island Stands Nationally
Among the steadiest day-night climates ranked: even the widest normal daily swing holds to roughly 19°F.
The normal water year runs well above the national norm at roughly 52 inches.
Westport Island earns 2 nationally notable standings (outer quintiles) against 6,860 NOAA 1991–2020 normals stations; only those extremes render.
Monthly Precipitation
Average monthly rainfall
12.5 days with precipitation
10.1 days with precipitation
11.2 days with precipitation
11.8 days with precipitation
14.7 days with precipitation
15.7 days with precipitation
12.3 days with precipitation
11.7 days with precipitation
9.0 days with precipitation
13.8 days with precipitation
12.5 days with precipitation
12.8 days with precipitation
Westport Island spreads its precipitation across the year
Neither half of the year dominates here: June through August take 22% of the annual total and December through February 26%, with neither reaching the 35% that would mark a distinct wet season. Westport Island has no dry season to plan around, though it does carry a wide 45.1°F gap between its warmest and coldest month.
The gap between the wettest and driest month still matters: December averages 5.4" and August 3.2". The three wettest months together take 30% of the year, against the 25% a perfectly flat distribution would give them.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. "Spread across the year" means neither the June-August nor the December-February share reaches 35%; it describes an average year, not the variability of any single one.
How Westport Island's precipitation splits across the calendar
About 148 days a year record measurable precipitation here, carrying 51.7" between them, or roughly 0.35 inches on a typical wet day. That sits in the middle band: neither the many-light-days pattern of the Pacific Northwest and the Great Lakes, nor the few-heavy-events pattern of the Gulf and the desert Southwest.
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year and say nothing about the heaviest single storm on record.
Frost Dates & Growing Season
First Fall Freeze
October 21
50% probability date
Last Spring Freeze
April 28
50% probability date
Growing Season
176 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
7,165
Higher = more heating needed
Cooling Degree Days
265
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside ME closest to Westport Island on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (46°F here).
- Algona, IA 46°F · 0.0°F off
- Arlington, WI 46°F · 0.0°F off
- Eau Claire, WI 46°F · 0.0°F off
- Glenbrook, NV 46°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (51.7" here), excluding temperature-peer places.
- Greensburg, KY 51.7" · 0.0" off
- Chesnee, SC 51.7" · 0.0" off
- Paragould, AR 51.7" · 0.0" off
- Columbus, GA 51.8" · 0.0" off
Data-derived climate profile
How Westport Island's climate pattern fits together
heating led · wet · mid swing
Westport Island's energy balance leans toward cold weather: 7,165 annual heating degree days against 265 for cooling. Its 45.1°F seasonal range still makes the monthly rows more useful than the annual average alone.
Westport Island's frost-free season lasts about 176 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
July and January mark the typical warm and cold ends of the calendar in Westport Island's middle-range seasonal profile. The measured spread is 45.1°F. The annual average is 46°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Alongside its heating load, Westport Island carries 51.7 inches of precipitation in a normal year, inside PlainClimate's wet range. Snowfall is not added to the interpretation because its annual value is missing. That distinction matters because a wet annual total can arrive as rain, snow, or a mixture at different times.
These labels group NOAA 1991-2020 normals from Westport Island's primary station, so the winter figures are a thirty-year average and not a floor: a single hard season can run well below them. Treat each band as a descriptive range for Westport Island, not an official NOAA class or a year-ahead forecast.
Questions about Westport Island's climate
How much rain does Westport Island get? ▼
How cold does Westport Island get in winter? ▼
How much energy does heating and cooling require in Westport Island? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Westport Island's primary station: WESTPORT ISLAND (USC00179547). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The conservative exact name-and-state crosswalk finds no Census place match, so PlainClimate treats this as a station-mapped location and does not claim it is a municipality. No exact Gazetteer row for Westport Island; facility counts that depend on place identity are therefore an upper bound, not a municipal census.
On this page every temperature, precipitation, and derived score for Westport Island comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.