Harleyville, SC climate
Harleyville has mild winters and hot summers, with plenty of rain. A typical July afternoon reaches 93°, a January night drops to 36°.
NOAA 1991-2020 climate normals Updated once a decade8° warmer than normal today. The forecast high is 90°, and a typical Oct 1 in Harleyville peaks around 82°.Live forecast: National Weather Service · Normal: NOAA 1991–2020
What a year in Harleyville feels like
Winter
Spring
Summer
Fall
Harleyville weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 60° | 36° | 3.4" | 43° – 55° |
| February | 63° | 39° | 3.4" | 43° – 60° |
| March | 70° | 45° | 3.6" | 51° – 64° |
| April | 77° | 51° | 3.3" | 59° – 69° |
| May | 85° | 60° | 3.5" | 68° – 77° |
| June | 90° | 68° | 5.5" | 75° – 83° |
| July | 93° | 71° | 5.4" | 80° – 85° |
| August | 91° | 71° | 5.8" | 78° – 84° |
| September | 86° | 66° | 4.7" | 73° – 80° |
| October | 78° | 54° | 4.0" | 62° – 70° |
| November | 69° | 44° | 2.9" | 51° – 62° |
| December | 62° | 39° | 3.6" | 41° – 61° |
| Year | 77° | 54° | 48.9" |
“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 Harleyville
Harleyville gets 49 inches of rain and melted snow a year. August is the wettest month and November the driest.
About 237 frost-free days a year
In half of years the last 32° night comes by March 22 and the first one by November 12. That leaves about 237 frost-free days for gardens, longer than 88% of U.S. towns.
Heating and cooling a home in Harleyville
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Harleyville, 54% of that work is heating and 46% 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 Harleyville 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 Harleyville averaged 1.2° warmer than the 1900s. The biggest change is in December (+2.3°). The shift is smaller than in 52% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Harleyville’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 41° to 61°. July is the most reliable, staying within 5°.
Common questions about Harleyville’s climate
What is the coldest month in Harleyville?
January, with a typical high of 60° and a low of 36°.
What is the hottest month in Harleyville?
July, with a typical high of 93° and a low of 71°. About 78 days a year reach 90°.
When is the first frost in Harleyville?
In half of years the first 32° night comes by November 12, and the last spring frost by March 22.
What is the rainiest month in Harleyville?
August, with 5.8 inches of rain and melted snow. The year totals 49 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Harleyville itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Holly Hill 1 Sw, SC (8 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.