Photo: John Phelan · CC BY-SA 3.0Summers in South Ashburnham are cooler than in 92% of U.S. towns
Midwinter brings lows of about 14°. Only 66° separates winter nights from summer afternoons. Its January nights bite harder than in 87% of U.S. towns. Seedlings are safe outdoors from about May 2, with the first autumn frost due around October 13.
A year in South Ashburnham at a glance
Each month’s typical high and low, and what it brings.
What stands out about South Ashburnham’s climate
Compared with towns across the U.S., with South Ashburnham’s place in Massachusetts beside it.
What a year in South Ashburnham feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 163 frost-free days a year
In half of years the last 32° night comes by May 2 and the first by October 13. Frost and day counts come from NOAA’s station at Ashburnham, MA, 1.4 miles from the town’s center, at about the same height.
The 2023 USDA map puts South Ashburnham’s center in zone 5b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −10°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 75 inches of snow a winter
Snow, measured at Ashburnham, MA, falls mostly in February. Precipitation (rain plus melted snow) adds up to 49 inches a year; October is the wettest month and February the driest. Rain or snow falls on about 137 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in South Ashburnham
95% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Ashburnham, MA.
Living with South Ashburnham’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
163 frost-free days in zone 5b. The last frost comes by May 2 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 13.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September. 1.7 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in South Ashburnham from natural hazards, river flooding is the largest share (58%); heat waves, cold waves, winter storms and ice storms together are 13%. Normals are averages; the hazards page covers the extremes.
Natural hazards →South Ashburnham and its neighbors
Every town next door is within a degree of South Ashburnham in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like South Ashburnham’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| South Ashburnham, MA | 14° | 80° | 49" | 75" |
| Walton, NY | 13° | 80° | 47" | 71" |
| Ellsworth, ME | 11° | 79° | 48" | 75" |
| Bradford, PA | 15° | 80° | 44" | 75" |
| Elkins, WV | 21° | 82° | 50" | 69" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in South Ashburnham averaged 1.9° warmer than the 1900s. The biggest change is in December (+3.6°).
A bigger shift than in 86% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How South Ashburnham compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with South Ashburnham’s place among Massachusetts’.
South Ashburnham weather by month
Highs, lows and precipitation from NOAA’s grid at South Ashburnham’s center; snow, wet days and snow on the ground from Ashburnham, MA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 32° | 14° | 3.6" | 16.9" | 13 | 24 | 13° – 30° |
| February | 35° | 16° | 3.3" | 18.9" | 11 | 24 | 11° – 32° |
| March | 43° | 23° | 4.2" | 16.4" | 13 | 20 | 26° – 42° |
| April | 56° | 33° | 4.2" | 4.0" | 12 | 4 | 41° – 49° |
| May | 67° | 44° | 3.9" | 0.1" | 13 | 0 | 50° – 61° |
| June | 75° | 53° | 4.4" | 0.0" | 12 | 0 | 61° – 67° |
| July | 80° | 59° | 4.0" | 0.0" | 11 | 0 | 65° – 73° |
| August | 78° | 57° | 4.1" | 0.0" | 10 | 0 | 64° – 72° |
| September | 71° | 49° | 4.3" | 0.0" | 9 | 0 | 57° – 64° |
| October | 59° | 38° | 5.1" | 0.3" | 11 | 0 | 44° – 56° |
| November | 47° | 29° | 3.9" | 3.0" | 11 | 3 | 34° – 43° |
| December | 37° | 20° | 4.3" | 15.6" | 13 | 17 | 22° – 39° |
| Year | 57° | 36° | 49.3" | 75.2" | 137 | 91 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 11° to 32°. June is the most reliable, staying within 6°.
Where South Ashburnham’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at South Ashburnham’s center.
- Snow: Ashburnham, MA (NOAA station in town).
- Frost, freezing nights, 90° and 100° days, heating and cooling: Ashburnham, MA, 1.4 miles from the town’s center, at about the same height; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about South Ashburnham’s climate
What is the weather like in South Ashburnham?
A typical July afternoon reaches 80°, a January night drops to 14°, and about 75 inches of snow falls in a normal winter. Colder January nights than 87% of U.S. towns; cooler July afternoons than 92% of U.S. towns.
How cold does it get in South Ashburnham in winter?
January nights average 14°. About 152 nights a year reach 32° or below and 7 reach 0° or below. In the coldest January of the last 30 years the month averaged 13°.
How much snow does South Ashburnham get?
About 75 inches in a normal winter at Ashburnham, MA, most of it in February, with snow on the ground about 91 days a year.
How hot does it get in South Ashburnham?
July, with a typical high of 80° and a low of 59°. About 3 days a year reach 90° (Ashburnham, MA).
When is the first and last frost in South Ashburnham?
In half of years the last spring frost (32°) comes by May 2 and the first fall frost by October 13, about 163 frost-free days, at Ashburnham, MA.
What growing zone is South Ashburnham in?
Zone 5b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −10°.
What is the best time of year to visit South Ashburnham?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is South Ashburnham getting warmer?
Yes: 1991–2020 averaged 1.9° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 86% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in South Ashburnham.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.