Williamston, SC climate
Williamston has mild winters and warm summers, with plenty of rain. A typical July afternoon reaches 90°, a January night drops to 33°, and about 1 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Williamston feels like
Winter
Spring
Summer
Fall
Williamston 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 | 53° | 33° | 4.3" | 0.6" | 9 | 0 | 36° – 49° |
| February | 57° | 35° | 3.9" | 0.1" | 9 | 0 | 38° – 54° |
| March | 64° | 42° | 4.8" | 0.5" | 9 | 0 | 46° – 63° |
| April | 73° | 48° | 3.7" | 0 | 7 | 0 | 56° – 65° |
| May | 80° | 58° | 4.1" | 0 | 7 | 0 | 64° – 74° |
| June | 87° | 66° | 4.2" | 0 | 8 | 0 | 72° – 80° |
| July | 90° | 69° | 4.1" | 0 | 7 | 0 | 77° – 84° |
| August | 88° | 69° | 4.5" | 0 | 8 | 0 | 75° – 84° |
| September | 83° | 63° | 3.5" | 0 | 6 | 0 | 70° – 78° |
| October | 73° | 51° | 3.3" | 0 | 5 | 0 | 58° – 67° |
| November | 63° | 40° | 3.6" | 0 | 7 | 0 | 47° – 57° |
| December | 55° | 35° | 4.5" | 0.2" | 9 | 0 | 36° – 55° |
| Year | 72° | 51° | 48.4" | 1.4" | 92 | 1 |
“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 Williamston
Williamston gets 48 inches of rain and melted snow a year. March is the wettest month and October the driest. Rain or snow falls on about 92 days a year.
About 219 frost-free days a year
In half of years the last 32° night comes by April 1 and the first one by November 4. That leaves about 219 frost-free days for gardens, longer than 82% of U.S. towns.
Heating and cooling a home in Williamston
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Williamston, 66% of that work is heating and 34% is cooling.
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.
How Williamston 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 Williamston averaged 1.1° warmer than the 1900s. The biggest change is in December (+2.5°). The shift is smaller than in 62% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Williamston’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. December swings the most: between 1991 and 2020 its average temperature ranged from 36° to 55°. July is the most reliable, staying within 7°.
Common questions about Williamston’s climate
What is the coldest month in Williamston?
January, with a typical high of 53° and a low of 33°.
What is the hottest month in Williamston?
July, with a typical high of 90° and a low of 69°. About 51 days a year reach 90°.
How much snow does Williamston get?
About 1 inches in a normal winter, most of it in January.
When is the first frost in Williamston?
In half of years the first 32° night comes by November 4, and the last spring frost by April 1.
What is the rainiest month in Williamston?
March, with 4.8 inches of rain and melted snow. The year totals 48 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Williamston itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at West Pelzer, SC (2 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.