Westfield, Massachusetts climate: Normal weather by month, frost dates and records
Westfield's normal year runs from 16°F January nights to 85°F July afternoons, with 45.2 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.7°C, January lows of −9°C, July highs of 29°C, 1,147 mm of precipitation a year.
- NOAA stationWestfield-Barnes Regional Airport
- Station IDUSW00014775
- Location42.16°N 72.72°W
- Elevation271 ft (83 m)
- From the center2 miles
- Population40,403
On October 23, the normal high in Westfield is 60°F and the normal low 37°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 Westfield.
- Jan 35° 16°
- Feb 38° 17°
- Mar 47° 26°
- Apr 60° 35°
- May 72° 46°
- Jun 80° 55°
- Jul 85° 61°
- Aug 83° 59°
- Sep 75° 51°
- Oct 63° 39°
- Nov 51° 30°
- Dec 40° 22°
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 Westfield each month?
July is the warmest month, with normal highs of 85°F; January the coldest, with normal lows of 16°F. The most precipitation falls in October (4.72 in), the least in February (2.60 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. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 35°F | 16°F | 25.1°F | 2.75 | 10 | <1 | 29 | 9 h 30 min |
| February | 38°F | 17°F | 27.6°F | 2.60 | 10 | <1 | 26 | 10 h 30 min |
| March | 47°F | 26°F | 36.1°F | 3.43 | 11 | <1 | 24 | 11 h 50 min |
| April | 60°F | 35°F | 47.8°F | 4.06 | 12 | <1 | 11 | 13 h 20 min |
| May | 72°F | 46°F | 58.9°F | 3.71 | 13 | 1 | 2 | 14 h 30 min |
| June | 80°F | 55°F | 67.4°F | 4.37 | 14 | 3 | <1 | 15 h 10 min |
| July | 85°F | 61°F | 72.9°F | 4.15 | 12 | 8 | <1 | 15 h |
| August | 83°F | 59°F | 71.0°F | 3.72 | 13 | 4 | <1 | 14 h |
| September | 75°F | 51°F | 63.1°F | 4.60 | 12 | 1 | <1 | 12 h 30 min |
| October | 63°F | 39°F | 51.2°F | 4.72 | 12 | <1 | 7 | 11 h 10 min |
| November | 51°F | 30°F | 40.5°F | 3.47 | 10 | <1 | 18 | 9 h 50 min |
| December | 40°F | 22°F | 31.0°F | 3.58 | 11 | <1 | 26 | 9 h 10 min |
| Year (annual) | 61°F | 38°F | 49.4°F | 45.16 | 137 | 18 | 144 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 2°C | −9°C | −3.8°C | 70 mm |
| February | 3°C | −8°C | −2.4°C | 66 mm |
| March | 8°C | −4°C | 2.3°C | 87 mm |
| April | 16°C | 2°C | 8.8°C | 103 mm |
| May | 22°C | 8°C | 14.9°C | 94 mm |
| June | 27°C | 13°C | 19.7°C | 111 mm |
| July | 29°C | 16°C | 22.7°C | 105 mm |
| August | 28°C | 15°C | 21.7°C | 94 mm |
| September | 24°C | 11°C | 17.3°C | 117 mm |
| October | 17°C | 4°C | 10.7°C | 120 mm |
| November | 10°C | −1°C | 4.7°C | 88 mm |
| December | 4°C | −5°C | −0.6°C | 91 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Hartford (15 miles away), gets 52 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00014775; 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 Westfield?
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 (12).
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 USW00014775.
When is the last frost in Westfield?
In Westfield, the last spring frost (32°F) comes after May 3 in half of years and after May 17 in one year in ten; the first autumn frost comes before October 8 in half of years and before September 26 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
- May 31 year in 10 after May 17; 9 in 10 after April 20
- First autumn frost, half of years before
- October 81 year in 10 before September 26; 9 in 10 before October 25
NOAA puts the median frost-free season at 158 days, and the season without a hard freeze (28°F) at 184 days.
A hard freeze (28°F) comes after April 21 in half of springs and before October 20 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Westfield in zone 6a in ZIP code 01085. By the map's own method, the average of each year's coldest night over 1991-2020, Westfield's NOAA station is in zone 6a: the coldest night of a typical year reaches −8°F (22 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 USW00014775; 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 in Westfield?
In a normal year in Westfield, 18 days a year reach 90°F, 144 nights fall to 32°F or colder and 137 days bring measurable precipitation.
- Days at 90°F or more
- 18a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 144a normal year
- Days that stay below freezing
- 32high of 32°F or less
- Days with 0.01 inch of precipitation
- 137a normal year
The highest temperature in Westfield's official record (kept by the National Weather Service since 1926) is 103°F, on July 6, 2010; the lowest is −20°F, on February 9, 1934.
The wettest calendar year on that record is 2018, with 61.79 in; the snowiest season is 1966–67, with 73.6 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USW00014775; records: ACIS (NOAA Regional Climate Centers), NWS threaded record BAFthr. Records use complete months only; a month missing more than three days is left out.
How sunny is Westfield?
Over a year 71% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Westfield, 3.8 kWh per square metre a day. August is the sunniest month (77%) and December the cloudiest (62%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 66% | 1.8 |
| February | 67% | 2.6 |
| March | 68% | 3.7 |
| April | 68% | 4.7 |
| May | 68% | 5.3 |
| June | 71% | 5.7 |
| July | 77% | 6.0 |
| August | 77% | 5.3 |
| September | 76% | 4.3 |
| October | 67% | 2.7 |
| November | 68% | 1.9 |
| December | 62% | 1.4 |
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 Westfield need?
A normal year in Westfield brings 6,330 heating degree days, 18% more than the median U.S. place (5,373), and 677 cooling degree days, 25% 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 2,798 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,235 | 0 |
| February | 1,047 | 0 |
| March | 895 | 0 |
| April | 520 | 5 |
| May | 222 | 33 |
| June | 49 | 121 |
| July | 5 | 250 |
| August | 12 | 198 |
| September | 121 | 64 |
| October | 433 | 5 |
| November | 735 | 0 |
| December | 1,056 | 0 |
| Year (annual) | 6,330 | 677 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00014775. 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 Westfield been warmer than normal lately?
2024 averaged 52.2°F, 2.8°F above the 1991-2020 normal of 49.4°F. 4 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 51.3°F | +1.9°F | 55.40 |
| 2022 | 50.5°F | +1.1°F | 41.84 |
| 2023 | 51.6°F | +2.2°F | 55.43 |
| 2024 | 52.2°F | +2.8°F | 45.64 |
Source: observed years: ACIS, station USW00014775. A year counts only with all twelve months complete.
How does Westfield's climate compare?
Westfield is warmer than 15 of the other 34 places with their own NOAA record in Massachusetts, and wetter than 10. Across the 7,247 U.S. stations with normals, its annual mean of 49.4°F is warmer than 38%.
In the Köppen classification computed from these normals, Westfield 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 Westfield share this climate record?
11 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.
- Chicopee, MAalso near: Belchertown (13 mi, 47.7°F a year); Amherst (14 mi, 48.2°F a year)55,381 people · 8 mi E
- Holyoke, MA37,838 people · 5 mi NE
- Easthampton, MA16,020 people · 8 mi N
- Thompsonville, CT7,473 people · 13 mi SE
- Hazardville, CT6,482 people · 15 mi SE
- Sherwood Manor, CT5,781 people · 13 mi SE
- Salmon Brook, CT2,229 people · 14 mi S
- Somers, CT10,905 people · 18 mi SE
- Suffield Depot, CT1,947 people · 13 mi S
- North Granby, CT1,510 people · 12 mi SW
- Russell, MA1,640 people · 8 mi NW
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 Westfield's other NOAA stations record?
One more NOAA station keeps 1991-2020 normals in or near Westfield. This page uses Westfield-Barnes Regional Airport; the other differs by site and elevation:
| Station | From the center | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Westfield (3 mi SW) USC00199193 | 4 mi SW | 430 ft | 48.7°F | 16°F | 84°F | 52.4 | – | April 28 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Westfield's climate
What is the coldest month in Westfield?
January, with a normal high of 35°F and a normal low of 16°F. The warmest is July (85°F by day, 61°F at night).
Does it snow in Westfield?
Yes. NOAA publishes no 1991-2020 snowfall normal for Westfield's NOAA station; the nearest record that keeps one, Hartford (15 miles away), records 52 inches of snow in a normal year.
What is the rainiest month in Westfield?
October, with 4.72 in of precipitation in a normal year; the driest is February with 2.60 in.
What plant hardiness zone is Westfield in?
The USDA's 2023 map puts Westfield in zone 6a in ZIP code 01085. By the same method at Westfield's NOAA station, the coldest night of a typical year reaches −8°F (22 years, 1991-2020): zone 6a.
How late can frost come in Westfield?
In half of years the last 32°F night comes after May 3; in one year in ten it comes after May 17. Waiting until May 17 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Westfield in OctoberThis month day by day, its records and recent years
- Massachusetts climateThe statewide normals and every place in the state
- Hartford, CT16 miles from this station, 51.0°F a year
- Amherst, MA18 miles from this station, 48.2°F a year
- Worthington, MA19 miles from this station, 45.3°F a year
- Belchertown, MA21 miles from this station, 47.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made