Boston, MA Climate: Temperature & Rain by Month
Annual temperature and rainfall from NOAA NCEI's 1991–2020 normals →; comfort score computed by PlainClimate
30-year climate normals (1991-2020) from Boston's primary NOAA station, BOSTON LOGAN INTL AP.
The climate verdict for Boston
Boston, Massachusetts has a mixed annual climate rather than one dominant extreme. Its NOAA normal shows an annual average of 52°F. Its climate comfort score of 63/100 (good) lands mid-pack nationally, exceeding 46% of station-mapped location scores.
- 52°F
- average temperature, NOAA 1991-2020 normal
- 63/100
- comfort score, above 46% of station-mapped location scores
- 43.6"
- annual precipitation · 49" snow
- 219 days
- frost-free days per growing season
Boston: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USW00014739 · Boston, MA 52°F mean · 43.6" precip
TEMP-COOL · RANK-MID · PHOTO-FINISH · PRCP-MID · SWING-MID · COMF-MID · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 52°F
- RANK-MID #3,362
- PHOTO-FINISH ≈ New Cumberland…
- PRCP-MID 43.6"
- SWING-MID 44°F
- COMF-MID 63/100
- LOAD-HEAT 5,545 HDD
- STN-1 USW00014739
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: New Cumberland L/d, WV (+ 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.
- Boston (this station) 52°F
- Hot Nampa Sugar Fac…, ID 52°F
- Near New Cumberland…, WV 52°F
- Near Pottstown Limer…, PA 52°F
- Near Connellsville, PA 52°F
Climate Living Index · Boston
Boston: 60/100 · grade C
Boston publishes all six Living Index dimensions from NOAA annual/seasonal normals · NOAA daily multivariate normals · NOAA hourly normals.
PlainClimate-derived for Boston, not an official NOAA rating. Rankings still use Comfort Score 63/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Frost-free season | 219 days/year | 77/100 · B |
| Normal heat + freeze calendar | 106 calendar days | 73/100 · B |
| Precipitation balance | 43.6 in · 8.6 from 35 in | 70/100 · B |
| Summer moisture balance | 60.4°F mean dew point | 60/100 · C |
| Annual temperature balance | 51.9°F · 15.6° from 67.5°F | 49/100 · D |
| Snowfall burden | 49.2 inches/year | 21/100 · F |
Boston · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Boston is a continental Köppen climate: Dfa
Coldest-month mean 29.9°F and warmest-month mean 74.1°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
- 74.1°F
- Coldest month
- 29.9°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 Boston sits across the climate record
Three NOAA fields for Boston's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 49th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- 66th percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- 54th percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Boston compares across U.S. station-mapped locations
Boston's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
63 46th percentile score exceeds 46% 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
Boston's measured station temperature trend
MethodologyAcross 86 complete annual observations from 1936 to 2025, BOSTON LOGAN INTL AP warmed at a fitted rate of 0.22°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Boston primary station fitted change +0.22 °C/decade
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 37°F (3°C) | 23°F (-5°C) | 30°F (-1°C) | 3.4" | 14.3" | 24.8 | 0.0 |
| February | 39°F (4°C) | 25°F (-4°C) | 32°F (0°C) | 3.2" | 14.4" | 21.7 | 0.0 |
| March | 46°F (8°C) | 31°F (0°C) | 38°F (3°C) | 4.2" | 9.0" | 16.2 | 0.0 |
| April | 56°F (14°C) | 41°F (5°C) | 49°F (9°C) | 3.6" | 1.6" | 2.1 | 0.1 |
| May | 67°F (19°C) | 50°F (10°C) | 58°F (15°C) | 3.3" | 0.0" | 0.0 | 0.6 |
| June | 76°F (25°C) | 60°F (15°C) | 68°F (20°C) | 3.9" | 0.0" | 0.0 | 2.5 |
| July | 82°F (28°C) | 66°F (19°C) | 74°F (23°C) | 3.3" | 0.0" | 0.0 | 6.3 |
| August | 80°F (27°C) | 65°F (18°C) | 73°F (23°C) | 3.2" | 0.0" | 0.0 | 3.8 |
| September | 73°F (23°C) | 58°F (15°C) | 66°F (19°C) | 3.6" | 0.0" | 0.0 | 0.8 |
| October | 62°F (17°C) | 48°F (9°C) | 55°F (13°C) | 4.0" | 0.2" | 0.2 | 0.0 |
| November | 52°F (11°C) | 38°F (3°C) | 45°F (7°C) | 3.7" | 0.7" | 6.8 | 0.0 |
| December | 42°F (6°C) | 29°F (-2°C) | 36°F (2°C) | 4.3" | 9.0" | 19.8 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 83°F around July 16, short of 90°F on every date, while 106 dates carry a normal low at or below freezing, the coldest 22°F near January 21.
The freezing stretch
The normal low stays at or below 32°F into March 20, then returns to freezing around December 6, covering 106 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 April 12, when 39% of years recorded at least a hundredth of an inch. The driest is August 30 at 28%. Summed across the calendar, that is about 129 wet dates a year.
The widest day
June 17 carries the biggest normal gap between afternoon and dawn, 17°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Boston.
Where Boston Stands Nationally
Among the steadiest day-night climates ranked: even the widest normal daily swing holds to roughly 17°F.
Boston 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 and snowfall
Snow: 14.3"
11.8 days with precipitation
Snow: 14.4"
10.6 days with precipitation
Snow: 9.0"
11.6 days with precipitation
Snow: 1.6"
11.6 days with precipitation
11.8 days with precipitation
10.9 days with precipitation
9.4 days with precipitation
9.0 days with precipitation
9.0 days with precipitation
Snow: 0.2"
10.5 days with precipitation
Snow: 0.7"
10.3 days with precipitation
Snow: 9.0"
11.9 days with precipitation
Boston spreads its precipitation across the year
Neither half of the year dominates here: June through August take 24% of the annual total and December through February 25%, with neither reaching the 35% that would mark a distinct wet season. Boston has no dry season to plan around, though it does carry a 44.2°F seasonal spread.
The gap between the wettest and driest month still matters: December averages 4.3" and February 3.2". The three wettest months together take 29% 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 Boston's precipitation splits across the calendar
About 128 days a year record measurable precipitation here, carrying 43.6" between them, or roughly 0.34 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.
Winter brings real snow to Boston
Boston averages 49.2 inches of snowfall a year, with February the snowiest month on the normals, spread across roughly 23 days that record measurable snow. That is depth accumulating on the ground, which is why it can exceed the annual precipitation figure: precipitation counts the liquid the snow melts down to, and fresh snow is mostly air.
- Annual snowfall: 49.2 inches of depth.
- Days recording measurable snow: about 23 a year.
- At a rough ten-to-one melt ratio, snow accounts for on the order of 11% of the year's precipitation.
NOAA 1991-2020 normals. The ten-to-one ratio is a convention, not a measurement: real ratios vary with temperature, so treat the share as an order of magnitude rather than an exact split.
Frost Dates & Growing Season
First Fall Freeze
November 9
50% probability date
Last Spring Freeze
April 4
50% probability date
Growing Season
219 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
5,545
Higher = more heating needed
Cooling Degree Days
802
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 | 58% | 12.1 | 23% | 36% |
| February | 59% | 12.8 | 20% | 41% |
| March | 59% | 12.3 | 19% | 41% |
| April | 61% | 11.4 | 18% | 40% |
| May | 67% | 10.8 | 14% | 38% |
| June | 65% | 10.2 | 14% | 26% |
| July | 68% | 9.6 | 15% | 24% |
| August | 68% | 10.0 | 22% | 22% |
| September | 70% | 10.5 | 24% | 29% |
| October | 65% | 11.4 | 19% | 35% |
| November | 64% | 11.6 | 18% | 39% |
| December | 62% | 12.3 | 20% | 39% |
Nationwide similar cities
Other rankable U.S. places outside MA closest to Boston 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 (52°F here).
- Atwood, KS 52°F · 0.0°F off
- Connellsville, PA 52°F · 0.0°F off
- Curtis, NE 52°F · 0.0°F off
- Escalante, UT 52°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (43.6" here), excluding temperature-peer places.
- Butler, MO 43.6" · 0.0" off
- Charlotte, NC 43.6" · 0.0" off
- Buchanan, VA 43.6" · 0.0" off
- Lynchburg, VA 43.6" · 0.0" off
Snow and freeze rhythm
When cold and snow define Boston
heating led · moderate · mid swing
Boston's energy balance leans toward cold weather: 5,545 annual heating degree days against 802 for cooling. Its 44.2°F seasonal range still makes the monthly rows more useful than the annual average alone.
Boston's frost-free season lasts about 219 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
-
1. Boston coldest normal
January
The monthly mean of 30°F (-1°C) sits near freezing, so cold nights and above-freezing afternoons share the same month.
-
2. Boston typical freeze period
January through December
The station reports average freezing days from January through December.
-
3. Boston snow peak
February
Boston averages 49.2 inches of snow a year, with February the snowiest month on the normals.
Questions about Boston's climate
How much snow does Boston get? ▼
How cold does Boston get in winter? ▼
How much energy does heating and cooling require in Boston? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Boston's primary station: BOSTON LOGAN INTL AP (USW00014739). 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 an incorporated place (GEOID 2507000). Match rule for Boston: 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 Boston 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.