Swans Island, ME climate
Swans Island has chilly winters and cool summers, with plenty of rain. A typical July afternoon reaches 76°, a January night drops to 15°.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Swans Island feels like
Winter
Spring
Summer
Fall
Swans Island weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 32° | 15° | 4.3" | 14° – 31° |
| February | 33° | 17° | 3.5" | 11° – 31° |
| March | 40° | 24° | 4.3" | 25° – 39° |
| April | 51° | 34° | 4.4" | 39° – 47° |
| May | 61° | 43° | 3.7" | 47° – 56° |
| June | 70° | 52° | 4.2" | 58° – 64° |
| July | 76° | 58° | 3.2" | 63° – 70° |
| August | 75° | 58° | 3.1" | 64° – 70° |
| September | 68° | 52° | 4.0" | 56° – 64° |
| October | 56° | 42° | 5.5" | 45° – 55° |
| November | 46° | 32° | 5.0" | 35° – 44° |
| December | 37° | 22° | 5.2" | 23° – 37° |
| Year | 54° | 37° | 50.3" |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Swans Island
Swans Island gets 50 inches of rain and melted snow a year. October is the wettest month and August the driest.
About 177 frost-free days a year
In half of years the last 32° night comes by April 27 and the first one by October 22. That leaves about 177 frost-free days for gardens, shorter than 51% of U.S. towns.
Heating and cooling a home in Swans Island
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Swans Island, 94% of that work is heating and 6% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Swans Island and its neighbors
Swans Island borders 4 towns with climate data. January nights across them vary by 1.9°. Deer Isle has the coldest January nights (13°) and Brooklin the hottest July afternoons (77°). Swans Island’s January low is 15° and its July high 76°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Swans Island compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Swans Island averaged 1.6° warmer than the 1900s. The biggest change is in December (+3.3°). The shift is larger than in 78% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Swans Island’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. February swings the most: between 1991 and 2020 its average temperature ranged from 11° to 31°. August is the most reliable, staying within 6°.
Common questions about Swans Island’s climate
What is the coldest month in Swans Island?
January, with a typical high of 32° and a low of 15°.
What is the hottest month in Swans Island?
July, with a typical high of 76° and a low of 58°. About 3 days a year reach 90°.
When is the first frost in Swans Island?
In half of years the first 32° night comes by October 22, and the last spring frost by April 27.
What is the rainiest month in Swans Island?
October, with 5.5 inches of rain and melted snow. The year totals 50 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Swans Island itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Acadia Np, ME (19 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.