Summerville, SC Climate: Temperature & Rain by Month
Annual temperature and rainfall from NOAA NCEI's 1991–2020 normals →; comfort score computed by PlainClimate
30-year climate normals (1991-2020) from Summerville's primary NOAA station, SUMMERVILLE 4W.
The climate verdict for Summerville
Water is the standout signal in Summerville, South Carolina: 52.7 inches of precipitation in a normal year. Against that wet profile, NOAA records an annual average of 64°F. It scores 80/100 for climate comfort (excellent), putting it in the top third of station-mapped location scores and exceeding 76% of them.
- 64°F
- average temperature, NOAA 1991-2020 normal
- 80/100
- comfort score, above 76% of station-mapped location scores
- 52.7"
- precipitation, annual total
- 235 days
- frost-free days per growing season
Summerville: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00388426 · Summerville, SC 64°F mean · 52.7" precip
TEMP-MILD · RANK-UPPER · PHOTO-FINISH · PRCP-WET · SWING-MID · COMF-TOP · LOAD-MIX · STN-1 · BOOK-FULL
- TEMP-MILD 64°F
- RANK-UPPER #5,832
- PHOTO-FINISH ≈ Beaufort Michae…
- PRCP-WET 52.7"
- SWING-MID 34°F
- COMF-TOP 80/100
- LOAD-MIX H/C balanced
- STN-1 USC00388426
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Beaufort Michael J Smith Fld, NC (+ 0 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every SC station list.
- Summerville (this station) 64°F
- Hot Carthage, MS 64°F
- Near Beaufort Michae…, NC 64°F
- Near Brookgreen Gard…, SC 64°F
- Near Calhoun Rsch, LA 64°F
Climate Living Index · Summerville
Summerville: 79/100 · grade B
Summerville publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Summerville, not an official NOAA rating. Rankings still use Comfort Score 80/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Normal heat + freeze calendar | 37 calendar days | 94/100 · A |
| Annual temperature balance | 63.8°F · 3.7° from 67.5°F | 89/100 · A |
| Frost-free season | 235 days/year | 83/100 · B |
| Precipitation balance | 52.7 in · 17.7 from 35 in | 37/100 · F |
Summerville · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Summerville is a temperate Köppen climate: Cfa
Coldest-month mean 46.4°F and warmest-month mean 80.5°F place this station in temperate, no dry season, hot summer climates (Cfa). Class Cfa is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: temperate, specifically temperate, no dry season, hot summer.
- Köppen code
- Cfa
- Group
- Temperate
- Warmest month
- 80.5°F
- Coldest month
- 46.4°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · balanced station
Where Summerville sits across the climate record
Three NOAA fields for Summerville's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Top 15% warmest
- Among 6,861 stations, Summerville sits in the warmer third of annual means.
- Annual precipitation
- Top 14% wettest
- Summerville's annual total ranks in the wetter third of 6,352 measured normals.
- Seasonal temperature swing
- Narrower than 84%
- Warmest-to-coldest month gap for Summerville is compact versus 6,861 complete station-years.
How Summerville compares across U.S. station-mapped locations
Summerville's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
80 Top 24% score exceeds 76% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). Below this entry.
- 50–60: 1,329 station-mapped locations (21%). Below this entry.
- 60–70: 1,236 station-mapped locations (20%). Below this entry.
- 70–80: 650 station-mapped locations (11%). Below this entry.
- 80–90: 921 station-mapped locations (15%). This entry sits in this band.
- 90–100: 564 station-mapped locations (9%). Above this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Summerville's measured station temperature trend
MethodologyAcross 76 complete annual observations from 1907 to 2025, SUMMERVILLE 4W cooled at a fitted rate of 0.05°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Summerville primary station fitted change -0.05 °C/decade
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 58°F (15°C) | 35°F (1°C) | 46°F (8°C) | 3.6" | 14.5 | 0.0 |
| February | 62°F (17°C) | 37°F (3°C) | 49°F (10°C) | 3.3" | 9.1 | 0.0 |
| March | 69°F (20°C) | 42°F (6°C) | 55°F (13°C) | 3.9" | 5.0 | 0.0 |
| April | 76°F (24°C) | 50°F (10°C) | 63°F (17°C) | 3.5" | 0.2 | 0.4 |
| May | 82°F (28°C) | 59°F (15°C) | 71°F (22°C) | 3.5" | 0.0 | 6.2 |
| June | 87°F (31°C) | 67°F (20°C) | 77°F (25°C) | 5.6" | 0.0 | 15.3 |
| July | 90°F (32°C) | 71°F (22°C) | 81°F (27°C) | 6.8" | 0.0 | 22.4 |
| August | 90°F (32°C) | 70°F (21°C) | 80°F (27°C) | 6.2" | 0.0 | 18.7 |
| September | 85°F (29°C) | 65°F (18°C) | 75°F (24°C) | 5.9" | 0.0 | 8.8 |
| October | 77°F (25°C) | 53°F (12°C) | 65°F (18°C) | 4.1" | 0.2 | 0.5 |
| November | 68°F (20°C) | 42°F (6°C) | 55°F (13°C) | 3.0" | 5.2 | 0.0 |
| December | 61°F (16°C) | 37°F (3°C) | 49°F (10°C) | 3.4" | 10.7 | 0.0 |
The year, day by day
The year in Summerville runs from a mild 34°F around January 17 to 90°F at the peak near July 21, and the normal low never reaches freezing on any date in the record.
When the heat sits
Normal highs reach 90°F from July 10 through August 15, covering 37 dates. The broader mild season, normal highs of 70°F or more, runs March 24 to November 7.
This counts calendar dates whose 1991–2020 normal high reaches 90°F. It is a smaller number than the 90°F+ day counts in the monthly table above, which measure how often the threshold was actually crossed in a typical year. A date can average 88°F and still exceed 90°F in half of all years.
No freezing date
Not one calendar date in the 1991–2020 record carries a normal low at or below 32°F. The coldest normal low of the year is 34°F around January 17.
The widest day
March 28 carries the biggest normal gap between afternoon and dawn, 27°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Summerville.
Where Summerville Stands Nationally
The normal water year runs well above the national norm at roughly 53 inches.
Summerville earns one nationally notable standing (outer quintile) against 6,860 NOAA 1991–2020 normals stations, middle-of-the-pack metrics stay silent here.
Monthly Precipitation
Average monthly rainfall
Summerville runs a summer-peaked wet season
35% of Summerville's yearly precipitation falls in June, July and August alone, against the 25% an evenly spread year would give those three months. The wettest month is July at 6.8", on a 34.1°F seasonal spread. Warm-season convection and, across the Southwest, the North American monsoon produce this shape: rain arrives in short heavy bursts during the hottest part of the year rather than as long cool-season soaking.
- Wettest three months: July, August, September, taking 36% of the annual total between them.
- Driest month: November at 3.0".
- Winter share: 20% falls in December, January and February.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. A summer-peaked label means the June-August share reaches 35%; it describes timing across an average year, not any single season, and says nothing about how heavy an individual storm can be.
Frost Dates & Growing Season
First Fall Freeze
November 12
50% probability date
Last Spring Freeze
March 22
50% probability date
Growing Season
235 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
2,385
Higher = more heating needed
Cooling Degree Days
1,988
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside SC closest to Summerville on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (64°F here).
- Carthage, MS 64°F · 0.0°F off
- Columbus, GA 64°F · 0.0°F off
- Dublin, TX 64°F · 0.0°F off
- Eldorado, TX 64°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (52.7" here), excluding temperature-peer places.
- Avon Park, FL 52.7" · 0.0" off
- Bayard, WV 52.7" · 0.0" off
- Stayton, OR 52.7" · 0.0" off
- Jasper, FL 52.6" · 0.1" off
Data-derived climate profile
How Summerville's climate pattern fits together
mixed demand · wet · mid swing
Water is prominent even though neither heating nor cooling wholly defines the record. Summerville averages 52.7 inches of precipitation a year. Snowfall is not added to the interpretation because its annual value is missing. The monthly table supplies the seasonal distribution hidden by that annual total.
July and January mark the typical warm and cold ends of the calendar in Summerville's middle-range seasonal profile. The measured spread is 34.1°F. The annual average is 64°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Heating and cooling both register in Summerville's normal, at 2,385 and 1,988 degree days respectively. Neither total exceeds the other by more than two to one, so the record is better read as a mixed-demand calendar than as heating-led or cooling-led.
A roughly 235-day frost-free season sits inside this mixed heating-and-cooling profile. Start and end dates matter because both sides of the thermostat register during a normal year.
These labels group NOAA 1991-2020 normals from Summerville's primary station, where heating and cooling demand are close enough that neither season sets the character on its own. On a balanced station like Summerville, the bands are descriptive ranges rather than an official NOAA classification or a forecast.
Questions about Summerville's climate
How much rain does Summerville get? ▼
How many days above 90°F does Summerville get? ▼
How much energy does heating and cooling require in Summerville? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Summerville's primary station: SUMMERVILLE 4W (USC00388426). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The 2024 Census Gazetteer identifies the exact name-and-state match as an incorporated place (GEOID 4570270). Match rule for Summerville: exact normalized name + state only, no fuzzy expansion, so nearby differently spelled facilities stay unmatched.
On this page every temperature, precipitation, and derived score for Summerville comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.