Plymouth, MA Climate: Temperature & Rain by Month
Explore NOAA NCEI's 1991–2020 climate normals → and a clearly labeled PlainClimate comfort calculation
30-year climate normals (1991-2020) from Plymouth's primary NOAA station, PLYMOUTH MUNI AP.
The climate verdict for Plymouth
Water is the standout signal in Plymouth, Massachusetts: 48.0 inches of precipitation in a normal year. Against that wet profile, NOAA records an annual average of 50°F. Its climate comfort score of 64/100 (good) lands mid-pack nationally, exceeding 49% of station-mapped location scores.
- 50°F
- average temperature, NOAA 1991-2020 normal
- 64/100
- comfort score, above 49% of station-mapped location scores
- 48.0"
- yearly precipitation total
- 169 days
- frost-free growing season
Plymouth: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USW00054769 · Plymouth, MA 50°F mean · 48.0" precip
TEMP-COOL · RANK-MID · PHOTO-FINISH · PRCP-MID · SWING-MID · COMF-MID · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 50°F
- RANK-MID #2,744
- PHOTO-FINISH ≈ Lehighton
- PRCP-MID 48.0"
- SWING-MID 43°F
- COMF-MID 64/100
- LOAD-HEAT 6,019 HDD
- STN-1 USW00054769
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Lehighton, PA (+ 0 °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 MA station list.
- Plymouth (this station) 50°F
- Cold Mesa Verde Nati…, CO 50°F
- Hot Austin, NV 50°F
- Near Lehighton, PA 50°F
- Near Loyalhanna Lake, PA 50°F
Climate Living Index · Plymouth
Plymouth: 49/100 · grade D
Plymouth publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals · NOAA hourly normals); 1 missing weight rescale to 100.
PlainClimate-derived for Plymouth, not an official NOAA rating. Rankings still use Comfort Score 64/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Normal heat + freeze calendar | 136 calendar days | 55/100 · C |
| Precipitation balance | 48.0 in · 13.0 from 35 in | 54/100 · D |
| Summer moisture balance | 61.3°F mean dew point | 54/100 · D |
| Frost-free season | 169 days/year | 41/100 · D |
| Annual temperature balance | 50.0°F · 17.5° from 67.5°F | 40/100 · D |
Plymouth · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Plymouth is a continental Köppen climate: Dfa
Coldest-month mean 29.2°F and warmest-month mean 71.9°F place this station in continental, no dry season, hot summer climates (Dfa). Class Dfa is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: continental, specifically continental, no dry season, hot summer.
- Köppen code
- Dfa
- Group
- Continental
- Warmest month
- 71.9°F
- Coldest month
- 29.2°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 Plymouth sits across the climate record
Three NOAA fields for Plymouth's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 40th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- Top 24% wettest
- Plymouth's annual total ranks in the wetter third of 6,352 measured normals.
- Seasonal temperature swing
- 47th percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Plymouth compares across U.S. station-mapped locations
Plymouth's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
64 49th percentile score exceeds 49% 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%). Below this entry.
- 60–70: 1,236 station-mapped locations (20%). This entry sits in this band.
- 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 | 38°F (3°C) | 20°F (-6°C) | 29°F (-2°C) | 3.8" | 26.7 | 0.0 |
| February | 40°F (4°C) | 21°F (-6°C) | 31°F (-1°C) | 3.0" | 24.5 | 0.0 |
| March | 46°F (8°C) | 27°F (-3°C) | 37°F (3°C) | 5.0" | 21.7 | 0.0 |
| April | 57°F (14°C) | 36°F (2°C) | 46°F (8°C) | 4.4" | 10.1 | 0.1 |
| May | 67°F (20°C) | 46°F (8°C) | 56°F (14°C) | 3.5" | 1.0 | 0.4 |
| June | 76°F (24°C) | 55°F (13°C) | 66°F (19°C) | 3.8" | 0.0 | 1.6 |
| July | 82°F (28°C) | 62°F (17°C) | 72°F (22°C) | 3.4" | 0.0 | 4.1 |
| August | 80°F (27°C) | 61°F (16°C) | 71°F (21°C) | 3.5" | 0.0 | 2.4 |
| September | 73°F (23°C) | 53°F (12°C) | 63°F (17°C) | 3.8" | 0.0 | 0.3 |
| October | 63°F (17°C) | 42°F (6°C) | 52°F (11°C) | 4.8" | 4.1 | 0.0 |
| November | 53°F (11°C) | 33°F (1°C) | 43°F (6°C) | 4.5" | 15.1 | 0.0 |
| December | 43°F (6°C) | 26°F (-3°C) | 35°F (1°C) | 4.6" | 23.5 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 83°F around July 18, short of 90°F on every date, while 136 dates carry a normal low at or below freezing, the coldest 19°F near January 24.
The freezing stretch
The normal low stays at or below 32°F into April 3, then returns to freezing around November 20, covering 136 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 October 1, when 46% of years recorded at least a hundredth of an inch. The driest is January 29 at 35%. Summed across the calendar, that is about 151 wet dates a year.
The widest day
May 4 carries the biggest normal gap between afternoon and dawn, 22°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Plymouth.
Where Plymouth Stands Nationally
Days and nights track unusually close together; the widest normal swing, about 22°F, is narrower than most stations record.
Plymouth earns one nationally notable standing (outer quintile) against 6,860 NOAA 1991–2020 normals stations, middle-of-the-pack metrics stay silent here.
Monthly Precipitation
Average monthly rainfall
11.4 days with precipitation
10.3 days with precipitation
12.3 days with precipitation
13.5 days with precipitation
14.0 days with precipitation
13.5 days with precipitation
12.0 days with precipitation
13.1 days with precipitation
13.0 days with precipitation
13.9 days with precipitation
11.2 days with precipitation
12.7 days with precipitation
Plymouth 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 24%, with neither reaching the 35% that would mark a distinct wet season. Plymouth has no dry season to plan around, though it does carry a 42.7°F seasonal spread.
The gap between the wettest and driest month still matters: March averages 5.0" and February 3.0". 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 Plymouth's precipitation splits across the calendar
About 151 days a year record measurable precipitation here, carrying 48.0" between them, or roughly 0.32 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 16
50% probability date
Last Spring Freeze
April 30
50% probability date
Growing Season
169 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
6,019
Higher = more heating needed
Cooling Degree Days
589
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Humidity & Wind
Monthly averages from hourly observations
| Month | Humidity | Wind (mph) | Clear Sky % | Overcast % |
|---|---|---|---|---|
| January | 67% | 8.5 | N/A | N/A |
| February | 66% | 8.9 | N/A | N/A |
| March | 59% | 9.0 | N/A | N/A |
| April | 67% | 8.0 | N/A | N/A |
| May | 74% | 7.5 | N/A | N/A |
| June | 73% | 6.8 | N/A | N/A |
| July | 75% | 6.4 | N/A | N/A |
| August | 75% | 6.2 | N/A | N/A |
| September | 78% | 6.7 | N/A | N/A |
| October | 73% | 7.8 | N/A | N/A |
| November | 71% | 8.0 | N/A | N/A |
| December | 70% | 8.5 | N/A | N/A |
Nationwide similar cities
Other rankable U.S. places outside MA closest to Plymouth 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 (50°F here).
- Albia, IA 50°F · 0.0°F off
- Aledo, IL 50°F · 0.0°F off
- Centerburg, OH 50°F · 0.0°F off
- Circleville, UT 50°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (48.0" here), excluding temperature-peer places.
- Flora, IL 48.0" · 0.0" off
- Washington, IN 48.0" · 0.0" off
- Immokalee, FL 48.0" · 0.0" off
- Salisbury, MD 48.0" · 0.0" off
Data-derived climate profile
How Plymouth's climate pattern fits together
heating led · wet · mid swing
Plymouth's energy balance leans toward cold weather: 6,019 annual heating degree days against 589 for cooling. Its 42.7°F seasonal range still makes the monthly rows more useful than the annual average alone.
Plymouth's frost-free season lasts about 169 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 Plymouth's middle-range seasonal profile. The measured spread is 42.7°F. The annual average is 50°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Alongside its heating load, Plymouth carries 48.0 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 Plymouth'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 Plymouth, not an official NOAA class or a year-ahead forecast.
Questions about Plymouth's climate
How much rain does Plymouth get? ▼
How cold does Plymouth get in winter? ▼
How much energy does heating and cooling require in Plymouth? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Plymouth's primary station: PLYMOUTH MUNI AP (USW00054769). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The 2024 Census Gazetteer identifies the exact name-and-state match as a census-designated place (GEOID 2554275), not an incorporated municipality. Match rule for Plymouth: exact normalized name + state only, no fuzzy expansion, so nearby differently spelled facilities stay unmatched.
On this page every temperature, precipitation, and derived score for Plymouth 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.