Boothbay Harbor, ME climate
Boothbay Harbor has cold, snowy winters and cool summers, with plenty of rain. A typical July afternoon reaches 76°, a January night drops to 15°, and about 79 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Boothbay Harbor feels like
Winter
Spring
Summer
Fall
Boothbay 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 | 31° | 15° | 3.7" | 19.6" | 12 | 25 | 14° – 30° |
| February | 33° | 17° | 3.4" | 20.3" | 11 | 25 | 11° – 31° |
| March | 40° | 25° | 4.2" | 14.1" | 11 | 18 | 26° – 39° |
| April | 51° | 34° | 4.2" | 4.4" | 12 | 2 | 40° – 47° |
| May | 61° | 44° | 3.7" | 0 | 14 | 0 | 47° – 57° |
| June | 70° | 53° | 4.2" | 0 | 13 | 0 | 59° – 65° |
| July | 76° | 59° | 3.3" | 0 | 12 | 0 | 63° – 70° |
| August | 75° | 59° | 3.2" | 0 | 10 | 0 | 64° – 70° |
| September | 68° | 52° | 4.1" | 0 | 10 | 0 | 57° – 65° |
| October | 57° | 42° | 5.1" | 0.3" | 12 | 0 | 46° – 56° |
| November | 47° | 32° | 4.5" | 3.5" | 12 | 2 | 34° – 44° |
| December | 37° | 22° | 4.5" | 16.5" | 13 | 15 | 23° – 37° |
| Year | 54° | 38° | 48.2" | 78.7" | 142 | 88 |
“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 Boothbay Harbor
Boothbay Harbor gets 48 inches of rain and melted snow a year. October is the wettest month and August the driest. Rain or snow falls on about 142 days a year. Snow covers the ground about 88 days of the year.
About 175 frost-free days a year
In half of years the last 32° night comes by April 28 and the first one by October 21. That leaves about 175 frost-free days for gardens, shorter than 54% of U.S. towns.
Heating and cooling a home in Boothbay Harbor
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Boothbay Harbor, 96% of that work is heating and 4% 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.
Boothbay Harbor and its neighbors
Boothbay Harbor borders 3 towns with climate data. January nights across them vary by 0.5°. Westport Island has both the coldest January nights (15°) and the hottest July afternoons (76°). Boothbay Harbor’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 Boothbay Harbor 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 Boothbay Harbor averaged 1.8° warmer than the 1900s. The biggest change is in December (+3.6°). The shift is larger than in 86% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Boothbay Harbor’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 Boothbay Harbor’s climate
What is the coldest month in Boothbay Harbor?
January, with a typical high of 31° and a low of 15°.
What is the hottest month in Boothbay Harbor?
July, with a typical high of 76° and a low of 59°.
How much snow does Boothbay Harbor get?
About 79 inches in a normal winter, most of it in February.
When is the first frost in Boothbay Harbor?
In half of years the first 32° night comes by October 21, and the last spring frost by April 28.
What is the rainiest month in Boothbay Harbor?
October, with 5.1 inches of rain and melted snow. The year totals 48 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Boothbay Harbor itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Newcastle, ME (15 mi, snow) and Westport Island, ME (5 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.