Blue Hill, Massachusetts climate: Climate normals at a NOAA weather station
Blue Hill's normal year runs from 19°F January nights to 82°F July afternoons, with 53.3 inches of precipitation and 69 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.8°C, January lows of −7°C, July highs of 28°C, 1,353 mm of precipitation a year.
- NOAA stationBlue Hill
- Station IDUSW00014753
- Location42.21°N 71.11°W
- Elevation625 ft (191 m)
On October 22, the normal high in Blue Hill is 59°F and the normal low 42°F, and the chance of measurable rain or snow is 39%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Blue Hill.
- Jan 35° 19°
- Feb 37° 21°
- Mar 45° 28°
- Apr 57° 37°
- May 67° 47°
- Jun 76° 56°
- Jul 82° 63°
- Aug 80° 62°
- Sep 72° 55°
- Oct 61° 44°
- Nov 50° 34°
- Dec 40° 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 at Blue Hill each month?
July is the warmest month, with normal highs of 82°F; January the coldest, with normal lows of 19°F. The most precipitation falls in March (5.43 in), the least in July (3.42 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 35°F | 19°F | 26.9°F | 4.46 | 18.2 | 13 | <1 | 27 | 9 h 20 min |
| February | 37°F | 21°F | 29.2°F | 3.97 | 21.2 | 11 | <1 | 25 | 10 h 30 min |
| March | 45°F | 28°F | 36.2°F | 5.43 | 12.8 | 12 | <1 | 21 | 11 h 50 min |
| April | 57°F | 37°F | 47.0°F | 4.61 | 1.8 | 13 | <1 | 6 | 13 h 20 min |
| May | 67°F | 47°F | 57.3°F | 3.80 | 0.0 | 14 | 1 | <1 | 14 h 30 min |
| June | 76°F | 56°F | 66.1°F | 4.57 | 0.0 | 13 | 1 | <1 | 15 h 10 min |
| July | 82°F | 63°F | 72.2°F | 3.42 | 0.0 | 10 | 4 | <1 | 15 h |
| August | 80°F | 62°F | 71.0°F | 3.85 | 0.0 | 10 | 3 | <1 | 14 h |
| September | 72°F | 55°F | 63.6°F | 4.22 | 0.0 | 10 | 1 | <1 | 12 h 30 min |
| October | 61°F | 44°F | 52.4°F | 5.29 | 0.8 | 12 | <1 | 2 | 11 h 10 min |
| November | 50°F | 34°F | 42.1°F | 4.32 | 1.7 | 11 | <1 | 12 | 9 h 50 min |
| December | 40°F | 26°F | 32.7°F | 5.33 | 12.8 | 13 | <1 | 23 | 9 h 10 min |
| Year (annual) | 58°F | 41°F | 49.7°F | 53.27 | 69.3 | 143 | 10 | 117 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 2°C | −7°C | −2.8°C | 113 mm | 46 cm |
| February | 3°C | −6°C | −1.6°C | 101 mm | 54 cm |
| March | 7°C | −2°C | 2.3°C | 138 mm | 33 cm |
| April | 14°C | 3°C | 8.3°C | 117 mm | 5 cm |
| May | 20°C | 8°C | 14.1°C | 97 mm | 0 cm |
| June | 24°C | 14°C | 18.9°C | 116 mm | 0 cm |
| July | 28°C | 17°C | 22.3°C | 87 mm | 0 cm |
| August | 27°C | 17°C | 21.7°C | 98 mm | 0 cm |
| September | 22°C | 13°C | 17.6°C | 107 mm | 0 cm |
| October | 16°C | 7°C | 11.3°C | 134 mm | 2 cm |
| November | 10°C | 1°C | 5.6°C | 110 mm | 4 cm |
| December | 4°C | −4°C | 0.4°C | 135 mm | 33 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00014753; 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.
Which months are mildest at Blue Hill?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, September has the fewest days with rain (10).
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 USW00014753.
When is the last frost at Blue Hill?
In Blue Hill, the last spring frost (32°F) comes after April 19 in half of years and after May 1 in one year in ten; the first autumn frost comes before October 24 in half of years and before October 10 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 191 year in 10 after May 1; 9 in 10 after April 8
- First autumn frost, half of years before
- October 241 year in 10 before October 10; 9 in 10 before November 6
NOAA puts the median frost-free season at 187 days, and the season without a hard freeze (28°F) at 211 days.
A hard freeze (28°F) comes after April 7 in half of springs and before November 5 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Blue Hill in zone 6b in ZIP code 02021, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, the station is in zone 6b: the coldest night of a typical year reaches −2°F (29 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 USW00014753; 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.
How hot and how cold does it get at Blue Hill?
In a normal year in Blue Hill, 10 days a year reach 90°F, 117 nights fall to 32°F or colder and 143 days bring measurable precipitation.
- Days at 90°F or more
- 10a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 117a normal year
- Days that stay below freezing
- 33high of 32°F or less
- Days with 0.01 inch of precipitation
- 143a normal year
- Days with 1 inch of snow or more
- 15a normal year
The highest temperature in this station's record (since 1959) is 101°F, on August 2, 1975; the lowest is −14°F, on February 14, 2016.
The wettest calendar year on that record is 1998, with 71.00 in; the snowiest season is 2014–15, with 150.8 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USW00014753; records: ACIS (NOAA Regional Climate Centers), station USW00014753. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Blue Hill?
Over a year 72% of the sunlight that would reach the ground under clear skies gets through the clouds at Blue Hill, 3.8 kWh per square metre a day. August is the sunniest month (78%) and December the cloudiest (66%).
| 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 many heating and cooling degree days does Blue Hill record?
A normal year at Blue Hill brings 6,166 heating degree days, 15% more than the median U.S. place (5,373), and 627 cooling degree days, 31% 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 2,725 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,179 | 0 |
| February | 1,004 | 0 |
| March | 895 | 0 |
| April | 544 | 4 |
| May | 262 | 23 |
| June | 69 | 102 |
| July | 8 | 231 |
| August | 11 | 197 |
| September | 107 | 63 |
| October | 398 | 6 |
| November | 687 | 0 |
| December | 1,003 | 0 |
| Year (annual) | 6,166 | 627 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00014753. 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.
Have recent years at Blue Hill been warmer than normal?
2025 averaged 50.4°F, 0.6°F above the 1991-2020 normal of 49.7°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 51.4°F | +1.7°F | 59.40 | 52.6 |
| 2022 | 51.7°F | +2.0°F | 42.98 | 70.7 |
| 2023 | 52.1°F | +2.4°F | 58.23 | 32.5 |
| 2024 | 52.0°F | +2.3°F | 55.05 | 39.1 |
| 2025 | 50.4°F | +0.6°F | 47.49 | 29.1 |
Source: observed years: ACIS, station USW00014753. A year counts only with all twelve months complete.
How does Blue Hill's climate compare?
Blue Hill is warmer than 17 of the 35 places with their own NOAA record in Massachusetts, and wetter than 34. Across the 7,247 U.S. stations with normals, its annual mean of 49.7°F is warmer than 39%.
In the Köppen classification computed from these normals, Blue Hill 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 Blue Hill share this climate record?
2 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.
- Randolph, MA35,114 people · 4 mi SE
- Milton, MA28,811 people · 3 mi NE
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
What do Blue Hill's other NOAA stations record?
One more NOAA station keeps 1991-2020 normals in or near Blue Hill. This page uses BLUE HILL; the other differs by site and elevation:
| Station | From this station | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Blue Hill Cooperative USC00190736 | in town | 625 ft | 49.7°F | 18°F | 82°F | 53.9 | 70 | April 18 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Blue Hill's climate
What is the coldest month at Blue Hill?
January, with a normal high of 35°F and a normal low of 19°F. The warmest is July (82°F by day, 63°F at night).
Does it snow at Blue Hill?
Yes: 69 inches in a normal year, falling on 26 days with 0.1 inch or more, the most in February (21.2 inches).
What is the rainiest month at Blue Hill?
March, with 5.43 in of precipitation in a normal year; the driest is July with 3.42 in.
What plant hardiness zone is Blue Hill in?
The USDA's 2023 map puts Blue Hill in zone 6b in ZIP code 02021, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches −2°F (29 years, 1991-2020): zone 6b.
How late can frost come at Blue Hill?
In half of years the last 32°F night comes after April 19; in one year in ten it comes after May 1. Waiting until May 1 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Massachusetts climateThe statewide normals and every place in the state
- Norwood, MA3 miles from this station, 52.0°F a year
- Jamaica Plain, MA6 miles from this station, 51.2°F a year
- Walpole, MA7 miles from this station, 50.8°F a year
- Hingham, MA11 miles from this station, 51.3°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made