Climate Comfort Score
78/100
Good
NOAA 1991–2020 normals 64°F annual avg Public-domain federal data
Summerville, SC Climate
Annual temperature, rainfall, and a comfort score, sourced from NOAA NCEI's 1991–2020 normals →
- 64°F
- Avg annual temp
- 78/100
- Comfort score
- 52.7"
- Annual precip
- 235d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Summerville
Summerville, South Carolina averages 64°F a year and scores 78/100 on the comfort index - good, milder than 74% of U.S. cities.
- 64°F
- average temperature, NOAA 1991-2020 normal
- 78/100
- comfort score, milder than 74% of U.S. cities
- 52.7"
- precipitation, annual total
- 235 days
- frost-free days per growing season
Based on NOAA U.S. Climate Normals (1991–2020) - 30-year averages describing the typical year, not a forecast.
Avg Temperature
64°F (18°C)
Avg High
75°F
Avg Low
52°F
Annual Precip
52.7"
Comfort Score
78/100
Good
Avg Annual Temperature
64°F
30-year mean (NOAA NCEI)
Annual Precipitation
52.7"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Summerville) 78.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Good for the Summerville area.
How Summerville compares to every U.S. city
Summerville's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
78 Top 26% higher than 74% of 6,915 US cities
Each bar is a band; taller bars hold more US cities. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Warming context for Summerville
MethodologyThe chart below traces how the U.S. land temperature anomaly has moved against the global mean since 1900. For Summerville, the NOAA 1991-2020 normal captures average conditions across that spread - notably, the most recent decade runs warmer than the 30-year mean itself.
- United States land mean (NOAA NCEI) +0.11 °C/decade
- Global anomaly (NASA GISTEMP) +0.11 °C/decade
- Paris Agreement thresholds 1.5°C / 2.0°C
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 |
Monthly Precipitation
Average monthly rainfall
January 3.6"
February 3.3"
March 3.9"
April 3.5"
May 3.5"
June 5.6"
July 6.8"
August 6.2"
September 5.9"
October 4.1"
November 3.0"
December 3.4"
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
What Summerville's climate means for you
Summerville runs 64°F a year - peaking in July, coldest in January.
- Gardeners get about 235 frost-free days, with the last spring freeze near March 22 - plan the planting calendar around it, not the regional average.
- Energy bills track 2,385 heating and 1,988 cooling degree days a year, higher means the furnace or AC runs more.
- Comparing places to live? Line this city up against nearby cities and the national rankings. See rankings
These are 30-year NOAA normals (1991–2020) - the typical year, not a forecast for any specific season.
Climate Guides
Climate Insight: Summerville, SC
Based on station USC00388426 feeding NOAA's 1991–2020 climate normals, Summerville, South Carolina averages 64°F a year, ranging from a mean daily high of 75°F to a mean daily low of 52°F. July is typically the warmest month of the year, while January is the coldest. Because these figures are thirty-year averages rather than any single year's readings, they describe the typical month, not a forecast for it.
Summerville averages 52.7 inches of precipitation a year, predominantly as rainfall, and that matters as much to daily life here as temperature does. The frost-free season averages 235 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near March 22 and the first fall freeze near November 12. As for energy demand, 2,385 heating degree days and 1,988 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Summerville scores 78/100 (Good), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. For planning purposes, look to the monthly tables above: shoulder seasons bring the mildest highs and lows, summer brings July-driven heat, and deep winter brings January-driven cold. Treat every figure here as a thirty-year average rather than a forecast - individual years routinely run warmer, cooler, wetter, or drier than the normal.
Frequently Asked Questions
What is the average temperature in Summerville, SC? ▼
The average annual temperature in Summerville, South Carolina is 64°F. The warmest month averages 90°F (32°C) and the coldest averages 35°F (1°C).
How much rain does Summerville get? ▼
Summerville receives 52.7 inches of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Summerville? ▼
Summerville has a climate comfort score of 78/100 (Good), milder than 74% of U.S. cities in the PlainClimate database.
When is the growing season in Summerville? ▼
Summerville has approximately 235 frost-free days per year, with the last spring freeze around March 22 and the first fall freeze around November 12.
How much energy does heating and cooling require in Summerville? ▼
Summerville has 2,385 heating degree days and 1,988 cooling degree days annually, a fairly balanced heating/cooling split. See our <a href="/guides/reading-weather-data/" class="underline hover:text-brand-600">guide to reading weather data</a> for what these figures mean.
Where does this Summerville climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00388426 near Summerville.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00388426. For informational purposes only.
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainClimate Editorial
Every figure on PlainClimate is rendered directly from NOAA 1991-2020 U.S. Climate Normals data, no number is typed in by an editor. This page draws directly on NOAA 1991-2020 U.S. Climate Normals data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.