South Union, SC climate
South Union has mild winters and warm summers, with plenty of rain. A typical July afternoon reaches 90°, a January night drops to 32°, and about 2 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in South Union feels like
Winter
Spring
Summer
Fall
South Union 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° | 32° | 4.8" | 0.8" | 11 | 0 | 35° – 48° |
| February | 57° | 35° | 4.6" | 0.8" | 11 | 0 | 38° – 54° |
| March | 65° | 41° | 4.9" | 0.3" | 11 | 0 | 46° – 62° |
| April | 73° | 48° | 4.0" | 0 | 10 | 0 | 56° – 65° |
| May | 80° | 57° | 3.7" | 0 | 10 | 0 | 64° – 73° |
| June | 87° | 65° | 4.5" | 0 | 11 | 0 | 72° – 80° |
| July | 90° | 69° | 4.2" | 0 | 10 | 0 | 76° – 83° |
| August | 88° | 68° | 4.8" | 0 | 11 | 0 | 74° – 83° |
| September | 83° | 62° | 4.0" | 0 | 8 | 0 | 70° – 78° |
| October | 73° | 51° | 3.8" | 0 | 8 | 0 | 58° – 66° |
| November | 63° | 40° | 3.8" | 0 | 9 | 0 | 47° – 57° |
| December | 55° | 35° | 5.0" | 0.3" | 11 | 0 | 36° – 55° |
| Year | 72° | 50° | 52.0" | 2.2" | 120 | 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 South Union
South Union gets 52 inches of rain and melted snow a year. December is the wettest month and May the driest. Rain or snow falls on about 120 days a year.
About 217 frost-free days a year
In half of years the last 32° night comes by April 1 and the first one by November 3. That leaves about 217 frost-free days for gardens, longer than 81% of U.S. towns.
Heating and cooling a home in South Union
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In South Union, 63% of that work is heating and 37% 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 South Union 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 Union averaged 0.9° warmer than the 1900s. The biggest change is in December (+2.2°). The shift is smaller than in 80% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at South Union’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 South Union’s climate
What is the coldest month in South Union?
January, with a typical high of 53° and a low of 32°.
What is the hottest month in South Union?
July, with a typical high of 90° and a low of 69°. About 55 days a year reach 90°.
How much snow does South Union get?
About 2 inches in a normal winter, most of it in January.
When is the first frost in South Union?
In half of years the first 32° night comes by November 3, and the last spring frost by April 1.
What is the rainiest month in South Union?
December, with 5.0 inches of rain and melted snow. The year totals 52 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for South Union itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Clemson Univ, SC (15 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.