South Thomaston, ME climate
South Thomaston has cold, snowy winters and cool summers, with plenty of rain. A typical July afternoon reaches 75°, a January night drops to 15°, and about 53 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decade4° warmer than normal today. The forecast high is 65°, and a typical Oct 1 in South Thomaston peaks around 61°.Live forecast: National Weather Service · Normal: NOAA 1991–2020
What a year in South Thomaston feels like
Winter
Spring
Summer
Fall
South Thomaston 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° | 4.1" | 15.1" | 11 | 19 | 14° – 29° |
| February | 32° | 16° | 3.5" | 13.9" | 10 | 20 | 11° – 31° |
| March | 39° | 24° | 4.3" | 8.4" | 11 | 16 | 25° – 38° |
| April | 50° | 34° | 4.3" | 2.3" | 12 | 2 | 38° – 47° |
| May | 60° | 43° | 3.8" | 0 | 13 | 0 | 46° – 55° |
| June | 69° | 52° | 4.2" | 0 | 12 | 0 | 57° – 64° |
| July | 75° | 58° | 3.2" | 0 | 12 | 0 | 62° – 69° |
| August | 74° | 58° | 3.2" | 0 | 10 | 0 | 64° – 69° |
| September | 67° | 52° | 4.1" | 0 | 10 | 0 | 56° – 64° |
| October | 56° | 41° | 5.2" | 0.1" | 11 | 0 | 45° – 55° |
| November | 46° | 32° | 4.7" | 2.0" | 11 | 1 | 34° – 43° |
| December | 36° | 22° | 4.9" | 11.3" | 13 | 9 | 23° – 37° |
| Year | 53° | 37° | 49.3" | 53.1" | 136 | 67 |
“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 South Thomaston
South Thomaston gets 49 inches of rain and melted snow a year. October is the wettest month and July the driest. Rain or snow falls on about 136 days a year. Snow covers the ground about 67 days of the year.
About 178 frost-free days a year
In half of years the last 32° night comes by April 27 and the first one by October 25. That leaves about 178 frost-free days for gardens, longer than 50% of U.S. towns.
Heating and cooling a home in South Thomaston
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In South Thomaston, 98% of that work is heating and 2% 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.
South Thomaston and its neighbors
South Thomaston borders 5 towns with climate data. January nights across them vary by 1.8°. Thomaston has both the coldest January nights (14°) and the hottest July afternoons (75°). South Thomaston’s January low is 15° and its July high 75°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How South Thomaston 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 South Thomaston averaged 1.7° warmer than the 1900s. The biggest change is in December (+3.6°). The shift is larger than in 80% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at South Thomaston’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 5°.
Common questions about South Thomaston’s climate
What is the coldest month in South Thomaston?
January, with a typical high of 31° and a low of 15°.
What is the hottest month in South Thomaston?
July, with a typical high of 75° and a low of 58°.
How much snow does South Thomaston get?
About 53 inches in a normal winter, most of it in January.
When is the first frost in South Thomaston?
In half of years the first 32° night comes by October 25, and the last spring frost by April 27.
What is the rainiest month in South Thomaston?
October, with 5.2 inches of rain and melted snow. The year totals 49 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for South Thomaston itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Tenants Harbor, ME (6 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.