Brockton, Massachusetts climate: Normal weather by month, frost dates and records
Brockton's normal year runs from 21°F January nights to 84°F July afternoons, with 50.2 inches of precipitation and 34 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.8°C, January lows of −6°C, July highs of 29°C, 1,276 mm of precipitation a year.
- NOAA stationBrockton
- Station IDUSC00190860
- Location42.05°N 71.01°W
- Elevation75 ft (23 m)
- From the center3 miles
- Population105,788
On October 22, the normal high in Brockton is 62°F and the normal low 41°F, and the chance of measurable rain or snow is 36%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Brockton.
- Jan 39° 21°
- Feb 41° 22°
- Mar 48° 29°
- Apr 59° 38°
- May 70° 47°
- Jun 78° 57°
- Jul 84° 63°
- Aug 83° 62°
- Sep 75° 54°
- Oct 64° 43°
- Nov 54° 34°
- Dec 44° 26°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Brockton each month?
July is the warmest month, with normal highs of 84°F; January the coldest, with normal lows of 21°F. The most precipitation falls in March (5.23 in), the least in July (3.17 in).
Each month has its own page with the day-by-day normals, the month's records and its recent years:
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 39°F | 21°F | 29.6°F | 4.02 | 9.1 | 11 | <1 | 27 | 9 h 30 min |
| February | 41°F | 22°F | 31.4°F | 3.62 | 12.8 | 11 | <1 | 25 | 10 h 30 min |
| March | 48°F | 29°F | 38.3°F | 5.23 | 6.9 | 12 | <1 | 23 | 11 h 50 min |
| April | 59°F | 38°F | 48.5°F | 4.53 | 0.7 | 12 | <1 | 8 | 13 h 20 min |
| May | 70°F | 47°F | 58.5°F | 3.44 | 0.0 | 13 | 1 | 1 | 14 h 30 min |
| June | 78°F | 57°F | 67.7°F | 4.13 | 0.0 | 11 | 3 | <1 | 15 h 10 min |
| July | 84°F | 63°F | 73.8°F | 3.17 | 0.0 | 10 | 6 | <1 | 15 h |
| August | 83°F | 62°F | 72.4°F | 3.60 | 0.0 | 9 | 5 | <1 | 14 h |
| September | 75°F | 54°F | 64.8°F | 4.08 | 0.0 | 9 | 1 | <1 | 12 h 30 min |
| October | 64°F | 43°F | 53.5°F | 4.96 | 0.1 | 11 | <1 | 5 | 11 h 10 min |
| November | 54°F | 34°F | 43.8°F | 4.39 | 0.2 | 11 | <1 | 16 | 9 h 50 min |
| December | 44°F | 26°F | 35.0°F | 5.06 | 4.5 | 12 | <1 | 25 | 9 h 10 min |
| Year (annual) | 62°F | 41°F | 51.4°F | 50.23 | 34.3 | 133 | 15 | 129 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 4°C | −6°C | −1.3°C | 102 mm | 23 cm |
| February | 5°C | −6°C | −0.3°C | 92 mm | 33 cm |
| March | 9°C | −2°C | 3.5°C | 133 mm | 18 cm |
| April | 15°C | 3°C | 9.2°C | 115 mm | 2 cm |
| May | 21°C | 9°C | 14.7°C | 87 mm | 0 cm |
| June | 26°C | 14°C | 19.8°C | 105 mm | 0 cm |
| July | 29°C | 17°C | 23.2°C | 81 mm | 0 cm |
| August | 28°C | 17°C | 22.4°C | 91 mm | 0 cm |
| September | 24°C | 12°C | 18.2°C | 104 mm | 0 cm |
| October | 18°C | 6°C | 11.9°C | 126 mm | 0 cm |
| November | 12°C | 1°C | 6.6°C | 112 mm | 1 cm |
| December | 7°C | −3°C | 1.7°C | 129 mm | 11 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00190860; 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.
When is the best weather to visit Brockton?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, August 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 USC00190860.
When is the last frost in Brockton?
In Brockton, the last spring frost (32°F) comes after April 22 in half of years and after May 5 in one year in ten; the first autumn frost comes before October 19 in half of years and before October 5 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
- April 221 year in 10 after May 5; 9 in 10 after April 8
- First autumn frost, half of years before
- October 191 year in 10 before October 5; 9 in 10 before November 3
NOAA puts the median frost-free season at 178 days, and the season without a hard freeze (28°F) at 205 days.
A hard freeze (28°F) comes after April 6 in half of springs and before October 31 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Brockton in zone 6b across its 2 ZIP code areas (6b in 02301, the largest). By the map's own method, the average of each year's coldest night over 1991-2020, Brockton's NOAA station is in zone 6b: the coldest night of a typical year reaches −1°F (26 complete years).
Frost dates for every NOAA station in Massachusetts · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00190860; 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.
What hardiness zone is each Brockton ZIP code in?
The USDA's 2023 map gives each ZIP code area one zone. Brockton's 2 ZIP code areas are all in zone 6b. Each ZIP's frost dates are in the frost tool.
Source: USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; ZIP areas in the place: Census Bureau 2020 ZCTA-to-place relationship file. A ZIP area counts when at least a tenth of its land (and 0.5 km²) lies in the place.
How hot and how cold does it get in Brockton?
In a normal year in Brockton, 15 days a year reach 90°F, 129 nights fall to 32°F or colder and 133 days bring measurable precipitation.
- Days at 90°F or more
- 15a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 129a normal year
- Days that stay below freezing
- 20high of 32°F or less
- Days with 0.01 inch of precipitation
- 133a normal year
- Days with 1 inch of snow or more
- 7a normal year
The highest temperature in this station's record (since 1894) is 105°F, on June 24, 2025; the lowest is −19°F, on February 9, 1934.
The wettest calendar year on that record is 1998, with 67.86 in; the snowiest season is 2014–15, with 103.4 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00190860; records: ACIS (NOAA Regional Climate Centers), station USC00190860. Records use complete months only; a month missing more than three days is left out.
How sunny is Brockton?
Over a year 72% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Brockton, 3.8 kWh per square metre a day. August is the sunniest month (78%) and December the cloudiest (66%). Among the 459 U.S. places of 50,000 or more, that ranks tied 385th (with 30 others) in sunshine.
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 69% | 1.8 |
| February | 70% | 2.7 |
| March | 69% | 3.7 |
| April | 69% | 4.7 |
| May | 68% | 5.3 |
| June | 71% | 5.7 |
| July | 78% | 6.0 |
| August | 78% | 5.3 |
| September | 77% | 4.3 |
| October | 68% | 2.8 |
| November | 70% | 2.0 |
| December | 66% | 1.5 |
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 much heating and cooling does Brockton need?
A normal year in Brockton brings 5,673 heating degree days, 6% more than the median U.S. place (5,373), and 773 cooling degree days, 15% fewer than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,982 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,096 | 0 |
| February | 941 | 0 |
| March | 827 | 0 |
| April | 499 | 4 |
| May | 229 | 29 |
| June | 49 | 130 |
| July | 4 | 277 |
| August | 8 | 238 |
| September | 93 | 86 |
| October | 366 | 9 |
| November | 635 | 1 |
| December | 928 | 0 |
| Year (annual) | 5,673 | 773 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00190860. 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.
Has Brockton been warmer than normal lately?
2024 averaged 55.2°F, 3.8°F above the 1991-2020 normal of 51.4°F. 4 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 55.5°F | +4.1°F | 48.70 | 5.0 |
| 2022 | 55.2°F | +3.8°F | 39.38 | 28.5 |
| 2023 | 55.9°F | +4.5°F | 48.84 | 3.4 |
| 2024 | 55.2°F | +3.8°F | 57.36 | 4.8 |
Over 86 complete years from 1894 to 2024, the station's annual mean temperature rose at a fitted 3.3°F per century (+0.18°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00190860; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Brockton's climate compare?
Brockton is warmer than 30 of the other 34 places with their own NOAA record in Massachusetts, and wetter than 29. Across the 7,247 U.S. stations with normals, its annual mean of 51.4°F is warmer than 47%.
In the Köppen classification computed from these normals, Brockton is Dfa: continental, no dry season, hot 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 Brockton share this climate record?
3 places have no NOAA station with 1991-2020 normals of their 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.
- Abington, MA17,090 people · 5 mi NE
- Holbrook, MA11,475 people · 6 mi N
- Hanson, MA10,719 people · 8 mi E
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 Brockton's climate
What is the coldest month in Brockton?
January, with a normal high of 39°F and a normal low of 21°F. The warmest is July (84°F by day, 63°F at night).
Does it snow in Brockton?
Yes: 34 inches in a normal year, falling on 8 days with 0.1 inch or more, the most in February (12.8 inches).
What is the rainiest month in Brockton?
March, with 5.23 in of precipitation in a normal year; the driest is July with 3.17 in.
What plant hardiness zone is Brockton in?
The USDA's 2023 map puts Brockton in zone 6b across its 2 ZIP code areas (6b in 02301, the largest). By the same method at Brockton's NOAA station, the coldest night of a typical year reaches −1°F (26 years, 1991-2020): zone 6b.
How late can frost come in Brockton?
In half of years the last 32°F night comes after April 22; in one year in ten it comes after May 5. Waiting until May 5 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Brockton in OctoberThis month day by day, its records and recent years
- Massachusetts climateThe statewide normals and every place in the state
- Bridgewater, MA7 miles from this station, 49.2°F a year
- Norton W, MA9 miles from this station, 49.5°F a year
- NWS Boston/Norton, MA9 miles from this station, 50.0°F a year
- Taunton, MA12 miles from this station, 50.5°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made