Green Harbor has chilly, snowy winters and pleasant summers, with plenty of rain
A typical July afternoon reaches 82°, a January night drops to 22°, and about 38 inches of snow falls in a normal winter.
A year in Green Harbor at a glance
Each month’s typical high and low, and what it brings.
What stands out about Green Harbor’s climate
Read from where Green Harbor sits among Massachusetts’s towns. The page puts what stands out first.
38 inches of snow, 51 of rain and melt
March is the wettest month and July the driest. Rain or snow falls on about 140 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Living with Green Harbor’s climate
What the numbers mean for a garden, a driveway, a furnace and a free afternoon.
198 frost-free days. The last frost comes by Apr 15 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 1.
About 38" a winter over 13 days with an inch or more, most in February. Snow covers the ground about 27 days a year.
Months averaging under 55° run from October through April. Heating is 87% of the year’s heating-and-cooling load.
About 12 days a year reach 90°, and July afternoons average 82°.
The nicest months are May, June, July, August, September and October. 0.0 miles of trails are waiting.
Parks & trails →Normals are averages. Ice storms, nor’easters, floods and heat waves are on the natural hazards page.
Natural hazards →What a year in Green Harbor feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 198 frost-free days a year
In half of years the last 32° night comes by April 15 and the first by November 1.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
Green Harbor and its neighbors
Marshfield has the coldest January nights next door (21°) and Marshfield the hottest July afternoons (83°). Tap a town to see its climate.
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 Green Harbor averaged 2.0° warmer than the 1900s. The biggest change is in December (+3.4°).
A bigger shift than in 94% of U.S. towns.
Change by month
How Green Harbor compares
Against every U.S. town on TownTapestry, each counted once, with its place in Massachusetts.
Green Harbor weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 38° | 22° | 4.2" | 10.1" | 12 | 9 | 21° – 37° |
| February | 40° | 23° | 3.8" | 11.5" | 11 | 8 | 19° – 39° |
| March | 46° | 29° | 5.2" | 8.5" | 13 | 5 | 32° – 45° |
| April | 57° | 38° | 4.5" | 1.0" | 12 | 0 | 44° – 52° |
| May | 67° | 48° | 3.6" | 0 | 13 | 0 | 51° – 62° |
| June | 76° | 57° | 3.9" | 0 | 12 | 0 | 63° – 69° |
| July | 82° | 64° | 3.4" | 0 | 11 | 0 | 68° – 77° |
| August | 80° | 63° | 3.7" | 0 | 11 | 0 | 68° – 76° |
| September | 73° | 56° | 4.2" | 0 | 10 | 0 | 61° – 68° |
| October | 62° | 45° | 4.8" | 0 | 12 | 0 | 50° – 60° |
| November | 52° | 36° | 4.5" | 0.1" | 12 | 0 | 39° – 49° |
| December | 44° | 28° | 4.9" | 6.7" | 12 | 5 | 30° – 46° |
| Year | 60° | 42° | 50.6" | 37.9" | 140 | 27 |
Heating and cooling a home in Green Harbor
87% of the work is heating, so the furnace matters far more than the air conditioner.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. Source: NOAA station normals.
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 19° to 39°. June is the most reliable, staying within 7°.
Common questions about Green Harbor’s climate
What is the coldest month in Green Harbor?
January, with a typical high of 38° and a low of 22°.
What is the hottest month in Green Harbor?
July, with a typical high of 82° and a low of 64°. About 12 days a year reach 90°.
How much snow does Green Harbor get?
About 38 inches in a normal winter, most of it in February.
When is the first frost in Green Harbor?
In half of years the first 32° night comes by November 1, and the last spring frost by April 15.
What is the rainiest month in Green Harbor?
March, with 5.2 inches of rain and melted snow. The year totals 51 inches.
Neighbors talk weather
Gardens, snow, and the best days of the year in Green Harbor.
Your answer becomes a post in Town Square.
Temperatures and rainfall come from NOAA’s gridded climate normals for Green Harbor itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Plymouth-kingston, MA (6 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Today’s forecast: National Weather Service.