Photo: John Phelan · CC BY 3.0Belmont gets more rain and snow than 73% of U.S. towns: 48 inches of precipitation a year
Peak summer warmth arrives in July, with afternoons near 84°. Winter nights are cold: in January they are colder than in 67% of U.S. towns. Warming shows here too: 2.0° more than in 1901–2000, led by December. Tender plants can go out after about April 4; in half of years the first frost comes by November 9.
A year in Belmont at a glance
Each month’s typical high and low, and what it brings.
What stands out about Belmont’s climate
Compared with towns across the U.S., with Belmont’s place in Massachusetts beside it.
What a year in Belmont feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 218 frost-free days a year
In half of years the last 32° night comes by April 4 and the first by November 9. Frost and day counts come from NOAA’s station at Boston Logan International Airport, 9 miles from the town’s center, 120 ft lower.
The 2023 USDA map puts Belmont’s center in zone 6b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −3°. 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 64 inches of snow a winter
Snow, measured at Reading, MA, is heaviest from January through February, about 17 inches a month. Precipitation (rain plus melted snow) adds up to 48 inches a year; October is the wettest month and February the driest. Rain or snow falls on about 138 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Belmont
87% 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 Boston Logan International Airport.
Living with Belmont’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
218 frost-free days in zone 6b. The last frost comes by Apr 4 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Nov 9.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August, September and October. 16 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Belmont from natural hazards, river flooding is the largest share (74%); heat waves, cold waves, winter storms and ice storms together are 7%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Belmont and its neighbors
Every town next door is within a degree of Belmont in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Belmont’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 |
|---|---|---|---|---|
| Belmont, MA | 19° | 84° | 48" | 64" |
| Shawangunk, NY | 17° | 84° | 48" | 59" |
| Johnstown, PA | 19° | 83° | 47" | 74" |
| Cortland, OH | 18° | 83° | 43" | 68" |
| 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 Belmont averaged 2.0° warmer than the 1900s. The biggest change is in December (+3.6°).
A bigger shift than in 91% 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 Belmont compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Belmont’s place among Massachusetts’.
Belmont weather by month
Highs, lows and precipitation from NOAA’s grid at Belmont’s center; snow, wet days and snow on the ground from Reading, MA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 36° | 19° | 3.6" | 17.2" | 12 | 18 | 18° – 34° |
| February | 39° | 20° | 3.4" | 16.2" | 11 | 18 | 16° – 36° |
| March | 47° | 27° | 4.4" | 13.3" | 13 | 13 | 31° – 45° |
| April | 59° | 37° | 4.2" | 2.2" | 13 | 1 | 44° – 52° |
| May | 69° | 47° | 3.6" | 0.0" | 13 | 0 | 52° – 63° |
| June | 78° | 56° | 4.1" | 0.0" | 12 | 0 | 63° – 70° |
| July | 84° | 62° | 3.6" | 0.0" | 11 | 0 | 68° – 76° |
| August | 82° | 61° | 3.6" | 0.0" | 9 | 0 | 68° – 75° |
| September | 74° | 53° | 3.9" | 0.0" | 10 | 0 | 60° – 68° |
| October | 63° | 42° | 4.7" | 0.1" | 11 | 0 | 48° – 59° |
| November | 52° | 33° | 3.9" | 1.7" | 11 | 1 | 37° – 47° |
| December | 42° | 24° | 4.6" | 12.8" | 13 | 11 | 27° – 43° |
| Year | 60° | 40° | 47.5" | 63.5" | 138 | 62 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 16° to 36°. June is the most reliable, staying within 7°.
Where Belmont’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 Belmont’s center.
- Snow: Reading, MA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Boston Logan International Airport, 9 miles from the town’s center, 120 ft lower; 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 Belmont’s climate
What is the weather like in Belmont?
A typical July afternoon reaches 84°, a January night drops to 19°, and about 64 inches of snow falls in a normal winter. Colder January nights than 67% of U.S. towns; cooler July afternoons than 64% of U.S. towns.
How cold does it get in Belmont in winter?
January nights average 19°. About 92 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 18°.
How much snow does Belmont get?
About 64 inches in a normal winter at Reading, MA, heaviest from January through February, about 17 inches a month, with snow on the ground about 62 days a year.
How hot does it get in Belmont?
July, with a typical high of 84° and a low of 62°. About 14 days a year reach 90° (Boston Logan International Airport).
When is the first and last frost in Belmont?
In half of years the last spring frost (32°) comes by April 4 and the first fall frost by November 9, about 218 frost-free days, at Boston Logan International Airport.
What growing zone is Belmont in?
Zone 6b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −3°.
What is the best time of year to visit Belmont?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Belmont getting warmer?
Yes: 1991–2020 averaged 2.0° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 91% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Belmont.
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.