Summerville, South Carolina climate: Normal weather by month, frost dates and records
Summerville's normal year runs from 35°F January nights to 90°F July afternoons, with 52.7 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 17.7°C, January lows of 1°C, July highs of 32°C, 1,339 mm of precipitation a year.
- NOAA stationSummerville (4 mi W)
- Station IDUSC00388426
- Location33.04°N 80.23°W
- Elevation65 ft (20 m)
- Population52,625
On October 23, the normal high in Summerville is 75°F and the normal low 50°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Summerville.
- Jan 58° 35°
- Feb 62° 37°
- Mar 69° 42°
- Apr 76° 50°
- May 82° 59°
- Jun 87° 67°
- Jul 90° 71°
- Aug 90° 70°
- Sep 85° 65°
- Oct 77° 53°
- Nov 68° 42°
- Dec 61° 37°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Summerville each month?
July is the warmest month, with normal highs of 90°F; January the coldest, with normal lows of 35°F. The most precipitation falls in July (6.78 in), the least in November (2.97 in).
Each month has its own page with the day-by-day normals, the month's records and its recent years:
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 58°F | 35°F | 46.4°F | 3.63 | – | <1 | 15 | 10 h 10 min |
| February | 62°F | 37°F | 49.4°F | 3.27 | – | <1 | 9 | 11 h |
| March | 69°F | 42°F | 55.4°F | 3.89 | – | <1 | 5 | 12 h |
| April | 76°F | 50°F | 62.6°F | 3.45 | – | <1 | <1 | 13 h |
| May | 82°F | 59°F | 70.7°F | 3.52 | – | 6 | <1 | 13 h 50 min |
| June | 87°F | 67°F | 77.2°F | 5.60 | – | 15 | <1 | 14 h 20 min |
| July | 90°F | 71°F | 80.5°F | 6.78 | – | 22 | <1 | 14 h 10 min |
| August | 90°F | 70°F | 80.1°F | 6.17 | – | 19 | <1 | 13 h 20 min |
| September | 85°F | 65°F | 74.8°F | 5.88 | – | 9 | <1 | 12 h 30 min |
| October | 77°F | 53°F | 64.8°F | 4.12 | – | 1 | <1 | 11 h 20 min |
| November | 68°F | 42°F | 54.9°F | 2.97 | – | <1 | 5 | 10 h 30 min |
| December | 61°F | 37°F | 49.3°F | 3.42 | – | <1 | 11 | 10 h |
| Year (annual) | 75°F | 52°F | 63.8°F | 52.70 | – | 72 | 45 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 15°C | 1°C | 8.0°C | 92 mm |
| February | 17°C | 3°C | 9.7°C | 83 mm |
| March | 20°C | 6°C | 13.0°C | 99 mm |
| April | 24°C | 10°C | 17.0°C | 88 mm |
| May | 28°C | 15°C | 21.5°C | 89 mm |
| June | 31°C | 20°C | 25.1°C | 142 mm |
| July | 32°C | 22°C | 26.9°C | 172 mm |
| August | 32°C | 21°C | 26.7°C | 157 mm |
| September | 29°C | 18°C | 23.8°C | 149 mm |
| October | 25°C | 12°C | 18.2°C | 105 mm |
| November | 20°C | 6°C | 12.7°C | 75 mm |
| December | 16°C | 3°C | 9.6°C | 87 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Charleston (15 miles away), gets 0 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00388426; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Summerville?
Normal highs sit between 65°F and 85°F in March, April, May, September, October and November.
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00388426.
When is the last frost in Summerville?
In Summerville, the last spring frost (32°F) comes after March 22 in half of years and after April 7 in one year in ten; the first autumn frost comes before November 12 in half of years and before October 29 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- March 221 year in 10 after April 7; 9 in 10 after March 1
- First autumn frost, half of years before
- November 121 year in 10 before October 29; 9 in 10 before December 3
NOAA puts the median frost-free season at 238 days, and the season without a hard freeze (28°F) at 265 days.
A hard freeze (28°F) comes after March 7 in half of springs and before November 29 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Summerville in zone 8b across its 2 ZIP code areas (8b in 29483, the largest).
Frost dates for every NOAA station in South Carolina · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00388426; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
What hardiness zone is each Summerville ZIP code in?
The USDA's 2023 map gives each ZIP code area one zone. Summerville's 2 ZIP code areas are all in zone 8b. Each ZIP's frost dates are in the frost tool.
Source: USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; ZIP areas in the place: Census Bureau 2020 ZCTA-to-place relationship file. A ZIP area counts when at least a tenth of its land (and 0.5 km²) lies in the place.
How hot and how cold does it get in Summerville?
In a normal year in Summerville, 72 days a year reach 90°F (2 of them 100°F or more) and 45 nights fall to 32°F or colder.
- Days at 90°F or more
- 72a normal year
- Days at 100°F or more
- 2a normal year
- Nights at 32°F or colder
- 45a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
The highest temperature in this station's record (since 1898) is 107°F, on September 21, 1925; the lowest is −5°F, on February 14, 1899.
The wettest calendar year on that record is 1948, with 69.59 in; the snowiest season is 1972–73, with 15.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00388426; records: ACIS (NOAA Regional Climate Centers), station USC00388426. Records use complete months only; a month missing more than three days is left out.
How sunny is Summerville?
Over a year 79% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Summerville, 4.6 kWh per square metre a day. July is the sunniest month (82%) and February the cloudiest (73%). Among the 459 U.S. places of 50,000 or more, that ranks tied 176th (with 33 others) in sunshine.
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 76% | 2.9 |
| February | 73% | 3.5 |
| March | 75% | 4.5 |
| April | 81% | 5.8 |
| May | 80% | 6.2 |
| June | 82% | 6.4 |
| July | 82% | 6.2 |
| August | 80% | 5.6 |
| September | 79% | 4.8 |
| October | 80% | 4.0 |
| November | 79% | 3.1 |
| December | 76% | 2.6 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Summerville need?
A normal year in Summerville brings 2,385 heating degree days, 56% fewer than the median U.S. place (5,373), and 1,988 cooling degree days, 2.2 times the median (908). Five months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 5,590 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 579 | 1 |
| February | 438 | 3 |
| March | 313 | 14 |
| April | 127 | 54 |
| May | 20 | 197 |
| June | 1 | 367 |
| July | 0 | 480 |
| August | 0 | 467 |
| September | 5 | 297 |
| October | 96 | 90 |
| November | 317 | 15 |
| December | 489 | 4 |
| Year (annual) | 2,385 | 1,988 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00388426. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Has Summerville been warmer than normal lately?
2025 averaged 66.0°F, 2.2°F above the 1991-2020 normal of 63.8°F. 2 of the 2 complete years since 2023 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2023 | 66.5°F | +2.8°F | 58.98 |
| 2025 | 66.0°F | +2.2°F | 47.15 |
Over 76 complete years from 1907 to 2025, the station's annual mean temperature rose at a fitted -0.9°F per century (−0.05°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00388426; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Summerville's climate compare?
Summerville is warmer than 46 of the other 72 places with their own NOAA record in South Carolina, and wetter than 54. Across the 7,247 U.S. stations with normals, its annual mean of 63.8°F is warmer than 85%.
In the Köppen classification computed from these normals, Summerville is Cfa: temperate, no dry season, hot summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Summerville share this climate record?
4 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Ladson, SC16,261 people · 7 mi E
- Sangaree, SC8,517 people · 6 mi E
- Ridgeville, SC1,234 people · 6 mi NW
- Lincolnville, SC1,212 people · 5 mi SE
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Summerville's climate
What is the coldest month in Summerville?
January, with a normal high of 58°F and a normal low of 35°F. The warmest is July (90°F by day, 71°F at night).
Does it snow in Summerville?
Rarely. NOAA publishes no 1991-2020 snowfall normal for Summerville's NOAA station; the nearest record that keeps one, Charleston (15 miles away), records 0 inches of snow in a normal year.
What is the rainiest month in Summerville?
July, with 6.78 in of precipitation in a normal year; the driest is November with 2.97 in.
What plant hardiness zone is Summerville in?
The USDA's 2023 map puts Summerville in zone 8b across its 2 ZIP code areas (8b in 29483, the largest).
How late can frost come in Summerville?
In half of years the last 32°F night comes after March 22; in one year in ten it comes after April 7. Waiting until April 7 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Summerville in OctoberThis month day by day, its records and recent years
- South Carolina climateThe statewide normals and every place in the state
- Charleston, SC15 miles from this station, 66.5°F a year
- Moncks Corner, SC20 miles from this station, 66.1°F a year
- Holly Hill, SC22 miles from this station, 63.9°F a year
- Charleston City, SC25 miles from this station, 67.2°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made