Ashburnham N, Massachusetts climate: Climate normals at a NOAA weather station
Ashburnham N's normal year runs from 11°F January nights to 79°F July afternoons, with 48.7 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 7.4°C, January lows of −11°C, July highs of 26°C, 1,237 mm of precipitation a year.
- NOAA stationAshburnham N
- Station IDUSC00190192
- Location42.66°N 71.94°W
- Elevation1,146 ft (349 m)
On October 23, the normal high in Ashburnham N is 55°F and the normal low 35°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 Ashburnham N.
- Jan 31° 11°
- Feb 33° 13°
- Mar 41° 21°
- Apr 54° 32°
- May 66° 44°
- Jun 74° 53°
- Jul 79° 58°
- Aug 78° 57°
- Sep 71° 49°
- Oct 58° 38°
- Nov 46° 29°
- Dec 36° 19°
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 N each month?
July is the warmest month, with normal highs of 79°F; January the coldest, with normal lows of 11°F. The most precipitation falls in October (5.09 in), the least in January (3.23 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 31°F | 11°F | 21.1°F | 3.23 | 10 | <1 | 30 | 9 h 20 min |
| February | 33°F | 13°F | 22.9°F | 3.27 | 10 | <1 | 27 | 10 h 30 min |
| March | 41°F | 21°F | 30.8°F | 4.17 | 10 | <1 | 28 | 11 h 50 min |
| April | 54°F | 32°F | 43.3°F | 4.02 | 12 | <1 | 17 | 13 h 20 min |
| May | 66°F | 44°F | 54.5°F | 4.10 | 13 | <1 | 2 | 14 h 40 min |
| June | 74°F | 53°F | 63.6°F | 4.17 | 12 | <1 | <1 | 15 h 20 min |
| July | 79°F | 58°F | 68.7°F | 3.89 | 10 | 1 | <1 | 15 h |
| August | 78°F | 57°F | 67.3°F | 4.37 | 9 | <1 | <1 | 14 h |
| September | 71°F | 49°F | 59.9°F | 4.27 | 9 | <1 | 1 | 12 h 30 min |
| October | 58°F | 38°F | 47.6°F | 5.09 | 13 | <1 | 8 | 11 h 10 min |
| November | 46°F | 29°F | 37.6°F | 3.82 | 10 | <1 | 21 | 9 h 50 min |
| December | 36°F | 19°F | 27.2°F | 4.29 | 11 | <1 | 28 | 9 h |
| Year (annual) | 56°F | 35°F | 45.4°F | 48.69 | 131 | 2 | 163 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | −1°C | −11°C | −6.1°C | 82 mm |
| February | 1°C | −11°C | −5.1°C | 83 mm |
| March | 5°C | −6°C | −0.7°C | 106 mm |
| April | 12°C | 0°C | 6.3°C | 102 mm |
| May | 19°C | 6°C | 12.5°C | 104 mm |
| June | 23°C | 12°C | 17.6°C | 106 mm |
| July | 26°C | 15°C | 20.4°C | 99 mm |
| August | 26°C | 14°C | 19.6°C | 111 mm |
| September | 21°C | 10°C | 15.5°C | 108 mm |
| October | 14°C | 3°C | 8.7°C | 129 mm |
| November | 8°C | −2°C | 3.1°C | 97 mm |
| December | 2°C | −7°C | −2.7°C | 109 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Ashburnham (3 miles away), gets 75 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00190192; 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 N?
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 USC00190192.
When is the last frost at Ashburnham N?
In Ashburnham N, the last spring frost (32°F) comes after May 5 in half of years and after May 19 in one year in ten; the first autumn frost comes before October 7 in half of years and before September 24 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 51 year in 10 after May 19; 9 in 10 after April 25
- First autumn frost, half of years before
- October 71 year in 10 before September 24; 9 in 10 before October 20
NOAA puts the median frost-free season at 152 days, and the season without a hard freeze (28°F) at 175 days.
A hard freeze (28°F) comes after April 25 in half of springs and before October 18 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Ashburnham N 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 USC00190192; 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 N?
In a normal year in Ashburnham N, 2 days a year reach 90°F, 163 nights fall to 32°F or colder and 131 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
- 163a normal year
- Days that stay below freezing
- 50high of 32°F or less
- Days with 0.01 inch of precipitation
- 131a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00190192.
How sunny is it at Ashburnham N?
Over a year 72% of the sunlight that would reach the ground under clear skies gets through the clouds at Ashburnham N, 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 N record?
A normal year at Ashburnham N brings 7,462 heating degree days, 39% more than the median U.S. place (5,373), and 348 cooling degree days, 62% 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 2,132 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,359 | 0 |
| February | 1,179 | 0 |
| March | 1,060 | 0 |
| April | 651 | 1 |
| May | 336 | 11 |
| June | 101 | 59 |
| July | 22 | 137 |
| August | 34 | 107 |
| September | 187 | 33 |
| October | 539 | 1 |
| November | 822 | 0 |
| December | 1,172 | 0 |
| Year (annual) | 7,462 | 348 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00190192. 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 N been warmer than normal?
2024 averaged 47.4°F, 2.0°F above the 1991-2020 normal of 45.4°F. 4 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 47.1°F | +1.7°F | 50.90 |
| 2022 | 46.4°F | +1.0°F | 45.01 |
| 2023 | 48.0°F | +2.6°F | 55.60 |
| 2024 | 47.4°F | +2.0°F | 49.99 |
Source: observed years: ACIS, station USC00190192. A year counts only with all twelve months complete.
How does Ashburnham N's climate compare?
Ashburnham N is warmer than 0 of the 35 places with their own NOAA record in Massachusetts, and wetter than 23. Across the 7,247 U.S. stations with normals, its annual mean of 45.4°F is warmer than 21%.
In the Köppen classification computed from these normals, Ashburnham N 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.
Questions about Ashburnham N's climate
What is the coldest month at Ashburnham N?
January, with a normal high of 31°F and a normal low of 11°F. The warmest is July (79°F by day, 58°F at night).
Does it snow at Ashburnham N?
Yes. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Ashburnham (3 miles away), records 75 inches of snow in a normal year.
What is the rainiest month at Ashburnham N?
October, with 5.09 in of precipitation in a normal year; the driest is January with 3.23 in.
What plant hardiness zone is Ashburnham N in?
The USDA's 2023 map puts Ashburnham N in zone 6a in ZIP code 01430, the nearest ZIP area.
How late can frost come at Ashburnham N?
In half of years the last 32°F night comes after May 5; in one year in ten it comes after May 19. Waiting until May 19 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, MA3 miles from this station, 46.2°F a year
- Birch Hill Dam, MA10 miles from this station, 46.3°F a year
- Jaffrey, NH11 miles from this station, 46.4°F a year
- Jaffrey Silver Ranch Airpark, NH11 miles from this station, 47.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made