Photo: User:Magicpiano · CC BY-SA 4.0Bridgewater has cooler summers than 95% of U.S. towns
Midwinter brings lows of about 10°. The gap between a January night and a July afternoon is 69°. Winter nights are cold: in January they are colder than in 94% of U.S. towns. Seedlings are safe outdoors from about May 20, with the first autumn frost due around September 27.
A year in Bridgewater at a glance
Each month’s typical high and low, and what it brings.
What stands out about Bridgewater’s climate
Compared with towns across the U.S., with Bridgewater’s place in New Hampshire beside it.
What a year in Bridgewater feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 128 frost-free days a year
In half of years the last 32° night comes by May 20 and the first by September 27. Frost and day counts come from NOAA’s station at Plymouth, NH, 9 miles from the town’s center, 340 ft lower.
The 2023 USDA map puts Bridgewater’s center in zone 5a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −15°. 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 68 inches of snow a winter
Snow, measured at Plymouth, NH, falls mostly in January. Precipitation (rain plus melted snow) adds up to 50 inches a year; October is the wettest month and February the driest. Rain or snow falls on about 141 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Bridgewater
97% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through May.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Plymouth, NH.
Living with Bridgewater’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
128 frost-free days in zone 5a. The last frost comes by May 20 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Sep 27.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September. 12 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Bridgewater from natural hazards, river flooding is the largest share (86%); heat waves, cold waves, winter storms and ice storms together are 5%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Bridgewater and its neighbors
Bristol the hottest July afternoons (81°, 2° 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 Bridgewater’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 |
|---|---|---|---|---|
| Bridgewater, NH | 10° | 79° | 50" | 68" |
| Ellsworth, ME | 11° | 79° | 48" | 75" |
| Walton, NY | 13° | 80° | 47" | 71" |
| Litchfield, CT | 15° | 81° | 51" | 59" |
| Bradford, PA | 15° | 80° | 44" | 75" |
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 Bridgewater averaged 1.6° warmer than the 1900s. The biggest change is in December (+3.5°).
A bigger shift than in 68% 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 Bridgewater compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Bridgewater’s place among New Hampshire’s.
Bridgewater weather by month
Highs, lows and precipitation from NOAA’s grid at Bridgewater’s center; snow, wet days and snow on the ground from Plymouth, NH. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 29° | 10° | 3.5" | 18.0" | 13 | 8° – 27° |
| February | 32° | 11° | 3.1" | 15.7" | 9 | 9° – 28° |
| March | 40° | 20° | 3.7" | 13.5" | 11 | 22° – 39° |
| April | 54° | 31° | 4.0" | 3.4" | 10 | 38° – 47° |
| May | 66° | 41° | 3.9" | 0.0" | 14 | 48° – 59° |
| June | 75° | 50° | 4.6" | 0.0" | 13 | 59° – 66° |
| July | 79° | 56° | 4.8" | 0.0" | 13 | 63° – 71° |
| August | 78° | 55° | 4.1" | 0.0" | 12 | 63° – 69° |
| September | 70° | 47° | 4.1" | 0.0" | 12 | 54° – 63° |
| October | 57° | 37° | 5.3" | 0.3" | 12 | 43° – 55° |
| November | 45° | 27° | 4.1" | 3.2" | 12 | 31° – 41° |
| December | 34° | 17° | 4.5" | 14.2" | 12 | 19° – 34° |
| Year | 55° | 33° | 49.6" | 68.3" | 141 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 9° to 28°. August is the most reliable, staying within 6°.
Where Bridgewater’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 Bridgewater’s center.
- Snow: Plymouth, NH.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Plymouth, NH, 9 miles from the town’s center, 340 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 Bridgewater’s climate
What is the weather like in Bridgewater?
A typical July afternoon reaches 79°, a January night drops to 10°, and about 68 inches of snow falls in a normal winter. Colder January nights than 94% of U.S. towns; cooler July afternoons than 95% of U.S. towns.
How cold does it get in Bridgewater in winter?
January nights average 10°. About 196 nights a year reach 32° or below and 27 reach 0° or below. In the coldest January of the last 30 years the month averaged 8°.
How much snow does Bridgewater get?
About 68 inches in a normal winter at Plymouth, NH, most of it in January.
How hot does it get in Bridgewater?
July, with a typical high of 79° and a low of 56°. About 5 days a year reach 90° (Plymouth, NH).
When is the first and last frost in Bridgewater?
In half of years the last spring frost (32°) comes by May 20 and the first fall frost by September 27, about 128 frost-free days, at Plymouth, NH.
What growing zone is Bridgewater in?
Zone 5a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −15°.
What is the best time of year to visit Bridgewater?
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 Bridgewater getting warmer?
Yes: 1991–2020 averaged 1.6° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 68% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Bridgewater.
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.