Photo: Marcbela (Marc N. Belanger) · Public domainCharlton’s winters are colder and snowier than most of the U.S.
A typical July afternoon reaches 81°, a January night drops to 16°, and about 64 inches of snow falls in a normal winter.
A year in Charlton at a glance
Each month’s typical high and low, and what it brings.
What stands out about Charlton’s climate
Compared with towns across the U.S., with Charlton’s place in Massachusetts beside it.
What a year in Charlton feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 162 frost-free days a year
In half of years the last 32° night comes by May 1 and the first by October 10. Frost and day counts come from NOAA’s station at Buffumville Lake, MA, 3 miles from the town’s center, 220 ft lower.
The 2023 USDA map puts Charlton’s center in zone 6b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −4°. 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 E Brimfield Lake, MA, falls mostly in February. Precipitation (rain plus melted snow) adds up to 51 inches a year; October is the wettest month and February the driest. Rain or snow falls on about 139 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Charlton
92% 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 Buffumville Lake, MA.
Living with Charlton’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
162 frost-free days in zone 6b. The last frost comes by May 1 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 10.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September. 35 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Charlton from natural hazards, river flooding is the largest share (58%); heat waves, cold waves, winter storms and ice storms together are 10%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Charlton and its neighbors
Southbridge Town the hottest July afternoons (82°, 1° warmer). Differences under a degree are within what the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Charlton’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 |
|---|---|---|---|---|
| Charlton, MA | 16° | 81° | 51" | 64" |
| Mount Carmel, PA | 18° | 80° | 49" | 48" |
| Walton, NY | 13° | 80° | 47" | 71" |
| Elkins, WV | 21° | 82° | 50" | 69" |
| Topsham, ME | 13° | 79° | 48" | 67" |
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 Charlton averaged 1.7° warmer than the 1900s. The biggest change is in December (+3.6°).
A bigger shift than in 71% 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 Charlton compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Charlton’s place among Massachusetts’.
Charlton weather by month
Highs, lows and precipitation from NOAA’s grid at Charlton’s center; snow, wet days and snow on the ground from E Brimfield Lake, MA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 34° | 16° | 3.8" | 13.4" | 13 | 19 | 16° – 32° |
| February | 37° | 18° | 3.4" | 16.8" | 11 | 18 | 13° – 34° |
| March | 44° | 25° | 4.4" | 13.6" | 12 | 13 | 28° – 44° |
| April | 57° | 35° | 4.4" | 3.8" | 12 | 1 | 42° – 50° |
| May | 68° | 45° | 3.8" | 0.0" | 14 | 0 | 51° – 61° |
| June | 76° | 54° | 4.4" | 0.0" | 11 | 0 | 62° – 68° |
| July | 81° | 60° | 4.0" | 0.0" | 11 | 0 | 66° – 74° |
| August | 79° | 58° | 4.5" | 0.0" | 12 | 0 | 65° – 72° |
| September | 72° | 51° | 4.3" | 0.0" | 10 | 0 | 58° – 65° |
| October | 60° | 40° | 5.1" | 0.1" | 11 | 0 | 46° – 57° |
| November | 49° | 31° | 4.0" | 2.0" | 11 | 2 | 36° – 45° |
| December | 39° | 23° | 4.6" | 13.8" | 12 | 12 | 24° – 41° |
| Year | 58° | 38° | 50.5" | 63.5" | 139 | 64 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 13° to 34°. June is the most reliable, staying within 6°.
Where Charlton’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 Charlton’s center.
- Snow: E Brimfield Lake, MA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Buffumville Lake, MA, 3 miles from the town’s center, 220 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 Charlton’s climate
What is the weather like in Charlton?
A typical July afternoon reaches 81°, a January night drops to 16°, and about 64 inches of snow falls in a normal winter. Colder January nights than 79% of U.S. towns; cooler July afternoons than 89% of U.S. towns.
How cold does it get in Charlton in winter?
January nights average 16°. About 153 nights a year reach 32° or below and 10 reach 0° or below. In the coldest January of the last 30 years the month averaged 16°.
How much snow does Charlton get?
About 64 inches in a normal winter at E Brimfield Lake, MA, most of it in February, with snow on the ground about 64 days a year.
How hot does it get in Charlton?
July, with a typical high of 81° and a low of 60°. About 8 days a year reach 90° (Buffumville Lake, MA).
When is the first and last frost in Charlton?
In half of years the last spring frost (32°) comes by May 1 and the first fall frost by October 10, about 162 frost-free days, at Buffumville Lake, MA.
What growing zone is Charlton in?
Zone 6b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −4°.
What is the best time of year to visit Charlton?
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 Charlton getting warmer?
Yes: 1991–2020 averaged 1.7° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 71% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Charlton.
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.