Charlestown, NH climate
Charlestown has cold, snowy winters and pleasant summers. A typical July afternoon reaches 81°, a January night drops to 11°, and about 60 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Charlestown feels like
Winter
Spring
Summer
Fall
Charlestown 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 | 30° | 11° | 3.1" | 14.9" | 11 | 26 | 10° – 28° |
| February | 33° | 12° | 2.6" | 15.9" | 8 | 25 | 10° – 29° |
| March | 42° | 21° | 3.1" | 11.7" | 9 | 21 | 23° – 41° |
| April | 56° | 32° | 3.5" | 2.4" | 11 | 3 | 39° – 48° |
| May | 68° | 43° | 3.6" | 0.1" | 13 | 0 | 50° – 61° |
| June | 76° | 52° | 4.3" | 0 | 12 | 0 | 62° – 68° |
| July | 81° | 57° | 4.2" | 0 | 12 | 0 | 65° – 73° |
| August | 79° | 56° | 4.2" | 0 | 11 | 0 | 64° – 71° |
| September | 72° | 47° | 3.8" | 0 | 10 | 0 | 55° – 64° |
| October | 59° | 37° | 4.8" | 1.2" | 11 | 1 | 43° – 55° |
| November | 46° | 28° | 3.3" | 2.7" | 10 | 3 | 33° – 42° |
| December | 35° | 18° | 3.9" | 11.0" | 11 | 19 | 20° – 36° |
| Year | 56° | 34° | 44.4" | 59.9" | 129 | 97 |
“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 Charlestown
Charlestown gets 44 inches of rain and melted snow a year. October is the wettest month and February the driest. Rain or snow falls on about 129 days a year. Snow covers the ground about 97 days of the year.
About 143 frost-free days a year
In half of years the last 32° night comes by May 13 and the first one by October 3. That leaves about 143 frost-free days for gardens, shorter than 87% of U.S. towns.
Heating and cooling a home in Charlestown
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Charlestown, 95% of that work is heating and 5% 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.
Charlestown and its neighbors
Charlestown borders 6 towns with climate data. January nights across them vary by 1.6°. Unity has the coldest January nights (9°) and Claremont the hottest July afternoons (82°). Charlestown’s January low is 11° and its July high 81°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Charlestown 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 Charlestown averaged 1.7° warmer than the 1900s. The biggest change is in December (+3.6°). The shift is larger than in 84% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Charlestown’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 10° to 29°. June is the most reliable, staying within 6°.
Common questions about Charlestown’s climate
What is the coldest month in Charlestown?
January, with a typical high of 30° and a low of 11°.
What is the hottest month in Charlestown?
July, with a typical high of 81° and a low of 57°. About 8 days a year reach 90°.
How much snow does Charlestown get?
About 60 inches in a normal winter, most of it in February.
When is the first frost in Charlestown?
In half of years the first 32° night comes by October 3, and the last spring frost by May 13.
What is the rainiest month in Charlestown?
October, with 4.8 inches of rain and melted snow. The year totals 44 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Charlestown itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Walpole 3, NH (12 mi, snow) and Springfield Hartness Airport, VT (10 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.