Photo: John Phelan · CC BY-SA 3.0Monomoscoy Island has cooler summers than 92% of U.S. towns
In January the night’s low is typically 25°. March is the wettest month, July the driest. Precipitation is plentiful here, more than falls on 75% of U.S. towns. Garden planting can start around April 11; autumn frost returns near November 11.
A year in Monomoscoy Island at a glance
Each month’s typical high and low, and what it brings.
What stands out about Monomoscoy Island’s climate
Compared with towns across the U.S., with Monomoscoy Island’s place in Massachusetts beside it.
What a year in Monomoscoy Island feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 213 frost-free days a year
In half of years the last 32° night comes by April 11 and the first by November 11. Frost and day counts come from NOAA’s station at Woods Hole Golf Club, MA, 9 miles from the town’s center, at about the same height.
The 2023 USDA map puts Monomoscoy Island’s center in zone 7a: 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 25 inches of snow a winter
Snow, measured at Edgartown, MA, is heaviest from January through February, about 8 inches a month. Precipitation (rain plus melted snow) adds up to 48 inches a year; March is the wettest month and July the driest. Rain or snow falls on about 128 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Monomoscoy Island
90% 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 Woods Hole Golf Club, MA.
Living with Monomoscoy Island’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
213 frost-free days in zone 7a. The last frost comes by Apr 11 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 11.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August, September and October. 0.5 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Monomoscoy Island from natural hazards, river flooding is the largest share (49%); heat waves, cold waves, winter storms and ice storms together are 1%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Monomoscoy Island and its neighbors
Every town next door is within a degree of Monomoscoy Island in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Monomoscoy Island’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 |
|---|---|---|---|---|
| Monomoscoy Island, MA | 25° | 80° | 48" | 25" |
| Galax, VA | 25° | 82° | 48" | 17" |
| Islip, NY | 26° | 83° | 45" | 32" |
| Princeton, WV | 23° | 82° | 41" | 24" |
| Shamokin, PA | 19° | 82° | 46" | 34" |
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 Monomoscoy Island averaged 2.0° warmer than the 1900s. The biggest change is in December (+3.4°).
A bigger shift than in 89% 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 Monomoscoy Island compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Monomoscoy Island’s place among Massachusetts’.
Monomoscoy Island weather by month
Highs, lows and precipitation from NOAA’s grid at Monomoscoy Island’s center; snow, wet days and snow on the ground from Edgartown, MA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 39° | 25° | 3.9" | 8.8" | 12 | 6 | 23° – 38° |
| February | 40° | 26° | 3.5" | 8.1" | 10 | 7 | 23° – 38° |
| March | 46° | 31° | 4.9" | 4.7" | 11 | 3 | 33° – 44° |
| April | 55° | 39° | 4.2" | 0.3" | 12 | 0 | 42° – 51° |
| May | 64° | 48° | 3.5" | 0.0" | 12 | 0 | 51° – 60° |
| June | 73° | 57° | 3.5" | 0.0" | 10 | 0 | 62° – 68° |
| July | 80° | 64° | 2.8" | 0.0" | 8 | 0 | 68° – 76° |
| August | 79° | 63° | 3.5" | 0.0" | 9 | 0 | 68° – 75° |
| September | 73° | 57° | 4.1" | 0.0" | 9 | 0 | 62° – 68° |
| October | 63° | 47° | 4.8" | 0.0" | 11 | 0 | 51° – 60° |
| November | 53° | 38° | 4.3" | 0.0" | 11 | 0 | 41° – 50° |
| December | 45° | 30° | 4.8" | 3.4" | 12 | 3 | 31° – 47° |
| Year | 59° | 44° | 47.8" | 25.3" | 128 | 20 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 31° to 47°. September is the most reliable, staying within 6°.
Where Monomoscoy Island’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 Monomoscoy Island’s center.
- Snow: Edgartown, MA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Woods Hole Golf Club, MA, 9 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 Monomoscoy Island’s climate
What is the weather like in Monomoscoy Island?
A typical July afternoon reaches 80°, a January night drops to 25°, and about 25 inches of snow falls in a normal winter. Milder January nights than 61% of U.S. towns; cooler July afternoons than 92% of U.S. towns.
How cold does it get in Monomoscoy Island in winter?
January nights average 25°. About 83 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 23°.
How much snow does Monomoscoy Island get?
About 25 inches in a normal winter at Edgartown, MA, heaviest from January through February, about 8 inches a month, with snow on the ground about 20 days a year.
How hot does it get in Monomoscoy Island?
July, with a typical high of 80° and a low of 64°. About 1 days a year reach 90° (Woods Hole Golf Club, MA).
When is the first and last frost in Monomoscoy Island?
In half of years the last spring frost (32°) comes by April 11 and the first fall frost by November 11, about 213 frost-free days, at Woods Hole Golf Club, MA.
What growing zone is Monomoscoy Island in?
Zone 7a 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 Monomoscoy Island?
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 Monomoscoy Island getting warmer?
Yes: 1991–2020 averaged 2.0° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 89% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Monomoscoy Island.
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.