Rock Hill, SC climate
Rock Hill has mild winters and warm summers. A typical July afternoon reaches 90°, a January night drops to 31°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decade12° warmer than normal today. The forecast high is 89°, and a typical Oct 2 in Rock Hill peaks around 77°.Live forecast: National Weather Service · Normal: NOAA 1991–2020
What a year in Rock Hill feels like
Winter
Spring
Summer
Fall
Rock Hill 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° | 31° | 3.7" | 0.1" | 9 | 0 | 36° – 48° |
| February | 57° | 34° | 3.2" | 0 | 9 | 0 | 37° – 54° |
| March | 64° | 40° | 3.9" | 0 | 9 | 0 | 46° – 62° |
| April | 74° | 48° | 3.6" | 0 | 8 | 0 | 57° – 65° |
| May | 80° | 57° | 3.6" | 0 | 8 | 0 | 65° – 74° |
| June | 87° | 65° | 4.1" | 0 | 9 | 0 | 72° – 80° |
| July | 90° | 69° | 3.7" | 0 | 9 | 0 | 77° – 84° |
| August | 88° | 68° | 4.1" | 0 | 9 | 0 | 75° – 84° |
| September | 83° | 62° | 3.7" | 0 | 7 | 0 | 69° – 77° |
| October | 73° | 50° | 3.1" | 0 | 6 | 0 | 58° – 67° |
| November | 63° | 39° | 3.2" | 0 | 7 | 0 | 46° – 57° |
| December | 55° | 34° | 3.6" | 0.1" | 9 | 0 | 35° – 55° |
| Year | 72° | 50° | 43.5" | 0.2" | 98 | 0 |
“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 Rock Hill
Rock Hill gets 43 inches of rain and melted snow a year. August is the wettest month and October the driest. Rain or snow falls on about 98 days a year.
About 225 frost-free days a year
In half of years the last 32° night comes by March 27 and the first one by November 5. That leaves about 225 frost-free days for gardens, longer than 84% of U.S. towns.
Heating and cooling a home in Rock Hill
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Rock Hill, 61% of that work is heating and 39% 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.
Rock Hill and its neighbors
Rock Hill borders 3 towns with climate data. January nights across them vary by 0.2°. Newport has the coldest January nights (31°) and India Hook the hottest July afternoons (91°). Rock Hill’s January low is 31° and its July high 90°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Rock Hill 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 Rock Hill averaged 0.8° warmer than the 1900s. The biggest change is in December (+1.7°). The shift is smaller than in 86% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Rock Hill’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 35° to 55°. July is the most reliable, staying within 8°.
Common questions about Rock Hill’s climate
What is the coldest month in Rock Hill?
January, with a typical high of 53° and a low of 31°.
What is the hottest month in Rock Hill?
July, with a typical high of 90° and a low of 69°. About 56 days a year reach 90°.
How much snow does Rock Hill get?
Almost none. A normal year brings 0.2 inches.
When is the first frost in Rock Hill?
In half of years the first 32° night comes by November 5, and the last spring frost by March 27.
What is the rainiest month in Rock Hill?
August, with 4.1 inches of rain and melted snow. The year totals 43 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Rock Hill itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Ft Mill 4 Nw, SC (6 mi, snow) and Winthrop Univ, SC (1 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.