Chatham Muni, MA Climate: Temperature & Rain by Month
Pulled from NOAA NCEI 1991–2020 normals →: climate measurements used in PlainClimate's documented score
30-year climate normals (1991-2020) from Chatham Muni's primary NOAA station, CHATHAM MUNI AP.
The climate verdict for Chatham Muni
Water is the standout signal in Chatham Muni, Massachusetts: 45.2 inches of precipitation in a normal year. Against that wet profile, NOAA records an annual average of 51°F. Its climate comfort score of 68/100 (good) lands mid-pack nationally, exceeding 56% of station-mapped location scores.
- 51°F
- annual average temperature (NOAA normal)
- 68/100
- comfort score, above 56% of station-mapped location scores
- 45.2"
- precipitation, annual total
- 205 days
- frost-free days per growing season
Chatham Muni: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USW00094624 · Chatham Muni, MA 51°F mean · 45.2" precip
TEMP-COOL · RANK-MID · PHOTO-FINISH · PRCP-MID · SWING-MID · COMF-MID · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 51°F
- RANK-MID #3,019
- PHOTO-FINISH ≈ Kamiah
- PRCP-MID 45.2"
- SWING-MID 39°F
- COMF-MID 68/100
- LOAD-HEAT 5,622 HDD
- STN-1 USW00094624
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Kamiah, ID (+ 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.
- Chatham (this station) 51°F
- Hot Grand Canyon Vi…, AZ 51°F
- Near Kamiah, ID 51°F
- Near Dayton, WA 51°F
- Near Santa FE Seton, NM 51°F
Climate Living Index · Chatham Muni
Chatham Muni: 62/100 · grade C
Chatham Muni publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Chatham Muni, not an official NOAA rating. Rankings still use Comfort Score 68/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Normal heat + freeze calendar | 101 calendar days | 75/100 · B |
| Frost-free season | 205 days/year | 68/100 · C |
| Precipitation balance | 45.2 in · 10.2 from 35 in | 64/100 · C |
| Annual temperature balance | 50.9°F · 16.6° from 67.5°F | 44/100 · D |
Chatham Muni · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Chatham Muni is a temperate Köppen climate: Cfb
Coldest-month mean 32.1°F and warmest-month mean 71.4°F place this station in temperate, no dry season, warm summer climates (Cfb). Class Cfb is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: temperate, specifically temperate, no dry season, warm summer.
- Köppen code
- Cfb
- Group
- Temperate
- Warmest month
- 71.4°F
- Coldest month
- 32.1°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 Chatham Muni sits across the climate record
Three NOAA fields for Chatham Muni's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 44th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- 69th percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- 33rd percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Chatham Muni compares across U.S. station-mapped locations
Chatham Muni's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
68 Top 44% score exceeds 56% 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 | 39°F (4°C) | 26°F (-4°C) | 32°F (0°C) | 3.8" | 22.9 | 0.0 |
| February | 40°F (4°C) | 26°F (-3°C) | 33°F (0°C) | 3.6" | 21.5 | 0.0 |
| March | 44°F (7°C) | 31°F (0°C) | 38°F (3°C) | 4.4" | 17.1 | 0.0 |
| April | 52°F (11°C) | 39°F (4°C) | 46°F (8°C) | 4.0" | 3.6 | 0.0 |
| May | 62°F (17°C) | 48°F (9°C) | 55°F (13°C) | 3.3" | 0.1 | 0.0 |
| June | 72°F (22°C) | 57°F (14°C) | 64°F (18°C) | 3.0" | 0.0 | 0.3 |
| July | 79°F (26°C) | 64°F (18°C) | 71°F (22°C) | 2.8" | 0.0 | 0.8 |
| August | 78°F (25°C) | 64°F (18°C) | 71°F (21°C) | 3.0" | 0.0 | 0.2 |
| September | 71°F (22°C) | 58°F (14°C) | 64°F (18°C) | 3.6" | 0.0 | 0.0 |
| October | 61°F (16°C) | 47°F (9°C) | 54°F (12°C) | 4.2" | 0.8 | 0.0 |
| November | 52°F (11°C) | 39°F (4°C) | 45°F (7°C) | 4.5" | 7.5 | 0.0 |
| December | 44°F (7°C) | 31°F (-1°C) | 37°F (3°C) | 5.0" | 18.6 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 80°F around July 23, short of 90°F on every date, while 101 dates carry a normal low at or below freezing, the coldest 25°F near January 24.
The freezing stretch
The normal low stays at or below 32°F into March 20, then returns to freezing around December 11, covering 101 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 January 2, when 47% of years recorded at least a hundredth of an inch. The driest is July 29 at 36%. Summed across the calendar, that is about 155 wet dates a year.
The widest day
June 30 carries the biggest normal gap between afternoon and dawn, 15°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Chatham Muni.
Where Chatham Muni Stands Nationally
Among the steadiest day-night climates ranked: even the widest normal daily swing holds to roughly 15°F.
Chatham Muni 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
14.4 days with precipitation
12.6 days with precipitation
12.5 days with precipitation
13.7 days with precipitation
12.9 days with precipitation
12.5 days with precipitation
11.4 days with precipitation
11.4 days with precipitation
12.8 days with precipitation
14.2 days with precipitation
12.5 days with precipitation
14.2 days with precipitation
Chatham Muni spreads its precipitation across the year
Neither half of the year dominates here: June through August take 19% of the annual total and December through February 27%, with neither reaching the 35% that would mark a distinct wet season. Chatham Muni has no dry season to plan around, though it does carry a 39.3°F seasonal spread.
The gap between the wettest and driest month still matters: December averages 5.0" and July 2.8". The three wettest months together take 31% 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 Chatham Muni's precipitation splits across the calendar
About 155 days a year record measurable precipitation here, carrying 45.2" between them, or roughly 0.29 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
November 4
50% probability date
Last Spring Freeze
April 13
50% probability date
Growing Season
205 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
5,622
Higher = more heating needed
Cooling Degree Days
512
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside MA closest to Chatham Muni 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 (51°F here).
- Battle Ground, WA 51°F · 0.0°F off
- Belington, WV 51°F · 0.0°F off
- Blaine, WA 51°F · 0.0°F off
- Bland, VA 51°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (45.2" here), excluding temperature-peer places.
- Rosebud, MO 45.2" · 0.0" off
- Warsaw, VA 45.2" · 0.0" off
- Warsaw, NY 45.2" · 0.0" off
- Lewiston, ME 45.2" · 0.0" off
Data-derived climate profile
How Chatham Muni's climate pattern fits together
heating led · wet · mid swing
Chatham Muni's energy balance leans toward cold weather: 5,622 annual heating degree days against 512 for cooling. Its 39.3°F seasonal range still makes the monthly rows more useful than the annual average alone.
Chatham Muni's frost-free season lasts about 205 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 Chatham Muni's middle-range seasonal profile. The measured spread is 39.3°F. The annual average is 51°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Alongside its heating load, Chatham Muni carries 45.2 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 Chatham Muni'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 Chatham Muni, not an official NOAA class or a year-ahead forecast.
Questions about Chatham Muni's climate
How much rain does Chatham Muni get? ▼
How cold does Chatham Muni get in winter? ▼
How much energy does heating and cooling require in Chatham Muni? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Chatham Muni's primary station: CHATHAM MUNI AP (USW00094624). 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 Chatham Muni; 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 Chatham Muni 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.