Hyannis Barnstable Municipal Airport, Massachusetts climate: Climate normals at a NOAA weather station
Hyannis Barnstable Municipal Airport's normal year runs from 24°F January nights to 81°F July afternoons, with 44.7 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.8°C, January lows of −4°C, July highs of 27°C, 1,135 mm of precipitation a year.
- NOAA stationHyannis Barnstable Municipal Airport
- Station IDUSW00094720
- Location41.67°N 70.28°W
- Elevation55 ft (17 m)
On October 23, the normal high in Hyannis Barnstable Municipal Airport is 61°F and the normal low 43°F, and the chance of measurable rain or snow is 38%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Hyannis Barnstable Municipal Airport.
- Jan 40° 24°
- Feb 41° 25°
- Mar 46° 30°
- Apr 55° 39°
- May 65° 48°
- Jun 74° 58°
- Jul 81° 65°
- Aug 80° 63°
- Sep 73° 56°
- Oct 63° 46°
- Nov 54° 37°
- Dec 45° 29°
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 Hyannis Barnstable Municipal Airport each month?
July is the warmest month, with normal highs of 81°F; January the coldest, with normal lows of 24°F. The most precipitation falls in December (4.68 in), the least in July (2.68 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 40°F | 24°F | 32.0°F | 3.90 | 12 | <1 | 25 | 9 h 30 min |
| February | 41°F | 25°F | 32.9°F | 3.17 | 11 | <1 | 23 | 10 h 30 min |
| March | 46°F | 30°F | 38.1°F | 4.25 | 11 | <1 | 19 | 11 h 50 min |
| April | 55°F | 39°F | 46.9°F | 3.90 | 13 | <1 | 7 | 13 h 20 min |
| May | 65°F | 48°F | 56.5°F | 3.42 | 12 | <1 | 1 | 14 h 30 min |
| June | 74°F | 58°F | 65.7°F | 3.14 | 11 | <1 | <1 | 15 h 10 min |
| July | 81°F | 65°F | 72.8°F | 2.68 | 9 | 1 | <1 | 15 h |
| August | 80°F | 63°F | 71.6°F | 3.25 | 10 | 1 | <1 | 13 h 50 min |
| September | 73°F | 56°F | 64.4°F | 3.85 | 10 | <1 | <1 | 12 h 30 min |
| October | 63°F | 46°F | 54.5°F | 4.33 | 12 | <1 | 2 | 11 h 10 min |
| November | 54°F | 37°F | 45.4°F | 4.13 | 11 | <1 | 11 | 9 h 50 min |
| December | 45°F | 29°F | 37.2°F | 4.68 | 13 | <1 | 21 | 9 h 10 min |
| Year (annual) | 60°F | 43°F | 51.5°F | 44.70 | 134 | 2 | 109 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 4°C | −4°C | 0.0°C | 99 mm |
| February | 5°C | −4°C | 0.5°C | 81 mm |
| March | 8°C | −1°C | 3.4°C | 108 mm |
| April | 13°C | 4°C | 8.3°C | 99 mm |
| May | 18°C | 9°C | 13.6°C | 87 mm |
| June | 23°C | 14°C | 18.7°C | 80 mm |
| July | 27°C | 18°C | 22.7°C | 68 mm |
| August | 27°C | 17°C | 22.0°C | 83 mm |
| September | 23°C | 13°C | 18.0°C | 98 mm |
| October | 17°C | 8°C | 12.5°C | 110 mm |
| November | 12°C | 3°C | 7.4°C | 105 mm |
| December | 7°C | −1°C | 2.9°C | 119 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Barnstable (1 miles away), gets 22 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00094720; 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 Hyannis Barnstable Municipal Airport?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, July 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 USW00094720.
When is the last frost at Hyannis Barnstable Municipal Airport?
In Hyannis Barnstable Municipal Airport, 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 28 in half of years and before October 13 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 9
- First autumn frost, half of years before
- October 281 year in 10 before October 13; 9 in 10 before November 11
NOAA puts the median frost-free season at 188 days, and the season without a hard freeze (28°F) at 216 days.
A hard freeze (28°F) comes after April 7 in half of springs and before November 9 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Hyannis Barnstable Municipal Airport in zone 7a in ZIP code 02601, 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 7a: the coldest night of a typical year reaches 3°F (20 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 USW00094720; 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 Hyannis Barnstable Municipal Airport?
In a normal year in Hyannis Barnstable Municipal Airport, 2 days a year reach 90°F, 109 nights fall to 32°F or colder and 134 days bring measurable precipitation.
- Days at 90°F or more
- 2a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 109a normal year
- Days that stay below freezing
- 18high of 32°F or less
- Days with 0.01 inch of precipitation
- 134a normal year
The highest temperature in this station's record (since 1998) is 100°F, on July 5, 1999; the lowest is −8°F, on February 21, 2015.
The wettest calendar year on that record is 2019, with 54.37 in.
Source: NOAA NCEI 1991-2020 annual normals, station USW00094720; records: ACIS (NOAA Regional Climate Centers), station USW00094720. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Hyannis Barnstable Municipal Airport?
Over a year 74% of the sunlight that would reach the ground under clear skies gets through the clouds at Hyannis Barnstable Municipal Airport, 3.9 kWh per square metre a day. August is the sunniest month (80%) and December the cloudiest (65%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 67% | 1.8 |
| February | 70% | 2.7 |
| March | 70% | 3.7 |
| April | 72% | 4.9 |
| May | 72% | 5.5 |
| June | 74% | 5.9 |
| July | 80% | 6.0 |
| August | 80% | 5.4 |
| September | 79% | 4.4 |
| October | 72% | 3.0 |
| November | 70% | 2.0 |
| December | 65% | 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 Hyannis Barnstable Municipal Airport record?
A normal year at Hyannis Barnstable Municipal Airport brings 5,518 heating degree days, 3% more than the median U.S. place (5,373), and 632 cooling degree days, 30% 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 2,764 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,023 | 0 |
| February | 899 | 0 |
| March | 834 | 0 |
| April | 545 | 1 |
| May | 272 | 8 |
| June | 64 | 85 |
| July | 4 | 246 |
| August | 9 | 212 |
| September | 88 | 72 |
| October | 332 | 8 |
| November | 588 | 0 |
| December | 860 | 0 |
| Year (annual) | 5,518 | 632 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00094720. 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 Hyannis Barnstable Municipal Airport been warmer than normal?
2025 averaged 50.2°F, 1.3°F below the 1991-2020 normal of 51.5°F. 2 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 53.2°F | +1.7°F | – |
| 2023 | 51.9°F | +0.4°F | 44.17 |
| 2024 | 51.1°F | −0.4°F | 40.97 |
| 2025 | 50.2°F | −1.3°F | – |
Source: observed years: ACIS, station USW00094720. A year counts only with all twelve months complete.
How does Hyannis Barnstable Municipal Airport's climate compare?
Hyannis Barnstable Municipal Airport is warmer than 31 of the 35 places with their own NOAA record in Massachusetts, and wetter than 9. Across the 7,247 U.S. stations with normals, its annual mean of 51.5°F is warmer than 47%.
In the Köppen classification computed from these normals, Hyannis Barnstable Municipal Airport is Cfa: temperate, 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 Hyannis Barnstable Municipal Airport share this climate record?
4 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.
- South Yarmouth, MA11,642 people · 4 mi E
- West Yarmouth, MA6,323 people · 2 mi SE
- Yarmouth Port, MA5,825 people · 4 mi NE
- Dennis, MA14,862 people · 6 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.
Questions about Hyannis Barnstable Municipal Airport's climate
What is the coldest month at Hyannis Barnstable Municipal Airport?
January, with a normal high of 40°F and a normal low of 24°F. The warmest is July (81°F by day, 65°F at night).
Does it snow at Hyannis Barnstable Municipal Airport?
Yes. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Barnstable (1 miles away), records 22 inches of snow in a normal year.
What is the rainiest month at Hyannis Barnstable Municipal Airport?
December, with 4.68 in of precipitation in a normal year; the driest is July with 2.68 in.
What plant hardiness zone is Hyannis Barnstable Municipal Airport in?
The USDA's 2023 map puts Hyannis Barnstable Municipal Airport in zone 7a in ZIP code 02601, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches 3°F (20 years, 1991-2020): zone 7a.
How late can frost come at Hyannis Barnstable Municipal Airport?
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
- Massachusetts climateThe statewide normals and every place in the state
- Barnstable, MA1 miles from this station, 50.3°F a year
- West Harwich, MA9 miles from this station, 50.4°F a year
- East Sandwich, MA11 miles from this station, 49.5°F a year
- Chatham, MA15 miles from this station, 50.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made