Ashburnham, Massachusetts climate: Climate normals at a NOAA weather station
Ashburnham's normal year runs from 14°F January nights to 80°F July afternoons, with 49.3 inches of precipitation and 75 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 7.9°C, January lows of −10°C, July highs of 26°C, 1,253 mm of precipitation a year.
- NOAA stationAshburnham
- Station IDUSC00190190
- Location42.62°N 71.92°W
- Elevation1,108 ft (338 m)
On October 23, the normal high in Ashburnham is 55°F and the normal low 37°F, and the chance of measurable rain or snow is 34%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Ashburnham.
- Jan 31° 14°
- Feb 33° 15°
- Mar 41° 23°
- Apr 55° 34°
- May 66° 44°
- Jun 75° 54°
- Jul 80° 60°
- Aug 78° 57°
- Sep 71° 51°
- Oct 57° 39°
- Nov 46° 31°
- Dec 35° 20°
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 Ashburnham each month?
July is the warmest month, with normal highs of 80°F; January the coldest, with normal lows of 14°F. The most precipitation falls in October (5.08 in), the least in February (3.34 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 31°F | 14°F | 22.1°F | 3.55 | 16.9 | 13 | <1 | 30 | 9 h 20 min |
| February | 33°F | 15°F | 24.0°F | 3.34 | 18.9 | 11 | <1 | 28 | 10 h 30 min |
| March | 41°F | 23°F | 32.0°F | 4.41 | 16.4 | 13 | <1 | 26 | 11 h 50 min |
| April | 55°F | 34°F | 44.1°F | 4.21 | 4.0 | 12 | <1 | 14 | 13 h 20 min |
| May | 66°F | 44°F | 55.1°F | 4.02 | 0.1 | 13 | <1 | 1 | 14 h 40 min |
| June | 75°F | 54°F | 64.1°F | 4.17 | 0.0 | 12 | 1 | <1 | 15 h 20 min |
| July | 80°F | 60°F | 69.6°F | 3.94 | 0.0 | 11 | 2 | <1 | 15 h |
| August | 78°F | 57°F | 67.7°F | 3.89 | 0.0 | 10 | <1 | <1 | 14 h |
| September | 71°F | 51°F | 60.8°F | 4.24 | 0.0 | 9 | <1 | <1 | 12 h 30 min |
| October | 57°F | 39°F | 48.3°F | 5.08 | 0.3 | 11 | <1 | 6 | 11 h 10 min |
| November | 46°F | 31°F | 38.2°F | 3.82 | 3.0 | 11 | <1 | 20 | 9 h 50 min |
| December | 35°F | 20°F | 27.7°F | 4.65 | 15.6 | 13 | <1 | 28 | 9 h |
| Year (annual) | 56°F | 37°F | 46.2°F | 49.32 | 75.2 | 137 | 3 | 152 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −1°C | −10°C | −5.5°C | 90 mm | 43 cm |
| February | 1°C | −9°C | −4.4°C | 85 mm | 48 cm |
| March | 5°C | −5°C | 0.0°C | 112 mm | 42 cm |
| April | 13°C | 1°C | 6.7°C | 107 mm | 10 cm |
| May | 19°C | 7°C | 12.8°C | 102 mm | 0 cm |
| June | 24°C | 12°C | 17.8°C | 106 mm | 0 cm |
| July | 26°C | 15°C | 20.9°C | 100 mm | 0 cm |
| August | 26°C | 14°C | 19.8°C | 99 mm | 0 cm |
| September | 22°C | 10°C | 16.0°C | 108 mm | 0 cm |
| October | 14°C | 4°C | 9.1°C | 129 mm | 1 cm |
| November | 8°C | −1°C | 3.4°C | 97 mm | 8 cm |
| December | 2°C | −7°C | −2.4°C | 118 mm | 40 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00190190; 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 Ashburnham?
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 (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 USC00190190.
When is the last frost at Ashburnham?
In Ashburnham, the last spring frost (32°F) comes after May 2 in half of years and after May 16 in one year in ten; the first autumn frost comes before October 13 in half of years and before October 1 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 21 year in 10 after May 16; 9 in 10 after April 19
- First autumn frost, half of years before
- October 131 year in 10 before October 1; 9 in 10 before October 30
NOAA puts the median frost-free season at 163 days, and the season without a hard freeze (28°F) at 189 days.
A hard freeze (28°F) comes after April 18 in half of springs and before October 25 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Ashburnham in zone 6a in ZIP code 01430, the nearest ZIP area.
Frost dates for every NOAA station in Massachusetts · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00190190; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. 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 Ashburnham?
In a normal year in Ashburnham, 3 days a year reach 90°F, 152 nights fall to 32°F or colder and 137 days bring measurable precipitation.
- Days at 90°F or more
- 3a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 152a normal year
- Days that stay below freezing
- 51high of 32°F or less
- Days with 0.01 inch of precipitation
- 137a normal year
- Days with 1 inch of snow or more
- 19a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00190190.
How sunny is it at Ashburnham?
Over a year 72% of the sunlight that would reach the ground under clear skies gets through the clouds at Ashburnham, 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 Ashburnham record?
A normal year at Ashburnham brings 7,230 heating degree days, 35% more than the median U.S. place (5,373), and 394 cooling degree days, 57% fewer than the median (908). Eight months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,244 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,330 | 0 |
| February | 1,148 | 0 |
| March | 1,023 | 0 |
| April | 629 | 2 |
| May | 317 | 12 |
| June | 92 | 66 |
| July | 16 | 159 |
| August | 29 | 114 |
| September | 168 | 40 |
| October | 519 | 1 |
| November | 804 | 0 |
| December | 1,156 | 0 |
| Year (annual) | 7,230 | 394 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00190190. 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 Ashburnham been warmer than normal?
2025 averaged 46.2°F, equal to the 1991-2020 normal of 46.2°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 47.4°F | +1.2°F | 54.15 | 47.5 |
| 2022 | 46.8°F | +0.6°F | 46.20 | 53.0 |
| 2023 | 48.0°F | +1.8°F | 59.76 | 79.4 |
| 2024 | 47.9°F | +1.7°F | 52.93 | 52.5 |
| 2025 | 46.2°F | at normal | 43.57 | 58.5 |
Source: observed years: ACIS, station USC00190190. A year counts only with all twelve months complete.
How does Ashburnham's climate compare?
Ashburnham is warmer than 2 of the 35 places with their own NOAA record in Massachusetts, and wetter than 24. Across the 7,247 U.S. stations with normals, its annual mean of 46.2°F is warmer than 24%.
In the Köppen classification computed from these normals, Ashburnham is Dfb: continental, no dry season, warm 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 Ashburnham 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.
- Gardner, MA21,381 people · 4 mi SW
- South Ashburnham, MA1,174 people · 1 mi W
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 Ashburnham's climate
What is the coldest month at Ashburnham?
January, with a normal high of 31°F and a normal low of 14°F. The warmest is July (80°F by day, 60°F at night).
Does it snow at Ashburnham?
Yes: 75 inches in a normal year, falling on 35 days with 0.1 inch or more, the most in February (18.9 inches).
What is the rainiest month at Ashburnham?
October, with 5.08 in of precipitation in a normal year; the driest is February with 3.34 in.
What plant hardiness zone is Ashburnham in?
The USDA's 2023 map puts Ashburnham in zone 6a in ZIP code 01430, the nearest ZIP area.
How late can frost come at Ashburnham?
In half of years the last 32°F night comes after May 2; in one year in ten it comes after May 16. Waiting until May 16 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Massachusetts climateThe statewide normals and every place in the state
- Ashburnham N, MA3 miles from this station, 45.4°F a year
- Fitchburg, MA9 miles from this station, 48.9°F a year
- Birch Hill Dam, MA11 miles from this station, 46.3°F a year
- Greenville, NH13 miles from this station, 45.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made