Climate Comfort Score
82/100
Excellent
NOAA 1991–2020 normals 66°F annual avg Public-domain federal data
Sullivans IS, SC Climate
Annual temperature, rainfall, and a comfort score, sourced from NOAA NCEI's 1991–2020 normals →
- 66°F
- Avg annual temp
- 82/100
- Comfort score
- 51.6"
- Annual precip
- 262d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Sullivans IS
Sullivans IS, South Carolina averages 66°F a year and scores 82/100 on the comfort index - excellent, milder than 83% of U.S. cities.
- 66°F
- annual average temperature (NOAA normal)
- 82/100
- comfort score, milder than 83% of U.S. cities
- 51.6"
- annual precipitation
- 262 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
66°F (19°C)
Avg High
76°F
Avg Low
55°F
Annual Precip
51.6"
Comfort Score
82/100
Excellent
Avg Annual Temperature
66°F
30-year mean (NOAA NCEI)
Annual Precipitation
51.6"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Sullivans IS) 82.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Excellent for the Sullivans IS area.
How Sullivans IS compares to every U.S. city
Sullivans IS's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
82 Top 17% higher than 83% 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 Sullivans IS
MethodologySullivans IS's NOAA 1991-2020 normal sits inside a longer story: U.S. land temperatures have been tracking (and drifting from) the global mean since 1900, and the chart below shows that spread, with the most recent decade running warmer than the 30-year mean.
- 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 | 59°F (15°C) | 37°F (3°C) | 48°F (9°C) | 3.8" | 7.7 | 0.0 |
| February | 61°F (16°C) | 39°F (4°C) | 50°F (10°C) | 3.3" | 4.2 | 0.0 |
| March | 67°F (19°C) | 45°F (7°C) | 56°F (13°C) | 3.5" | 1.2 | 0.0 |
| April | 75°F (24°C) | 54°F (12°C) | 64°F (18°C) | 3.6" | 0.1 | 0.3 |
| May | 82°F (28°C) | 63°F (17°C) | 73°F (23°C) | 3.3" | 0.0 | 2.2 |
| June | 88°F (31°C) | 70°F (21°C) | 79°F (26°C) | 5.4" | 0.0 | 10.4 |
| July | 91°F (33°C) | 73°F (23°C) | 82°F (28°C) | 6.0" | 0.0 | 19.0 |
| August | 90°F (32°C) | 72°F (22°C) | 81°F (27°C) | 6.7" | 0.0 | 16.1 |
| September | 86°F (30°C) | 68°F (20°C) | 77°F (25°C) | 5.5" | 0.0 | 6.4 |
| October | 78°F (26°C) | 58°F (14°C) | 68°F (20°C) | 3.9" | 0.0 | 0.5 |
| November | 69°F (21°C) | 47°F (8°C) | 58°F (15°C) | 3.0" | 0.7 | 0.0 |
| December | 62°F (17°C) | 40°F (4°C) | 51°F (11°C) | 3.6" | 4.2 | 0.0 |
Monthly Precipitation
Average monthly rainfall
January 3.8"
February 3.3"
March 3.5"
April 3.6"
May 3.3"
June 5.4"
July 6.0"
August 6.7"
September 5.5"
October 3.9"
November 3.0"
December 3.6"
Frost Dates & Growing Season
First Fall Freeze
November 30
50% probability date
Last Spring Freeze
March 13
50% probability date
Growing Season
262 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
2,051
Higher = more heating needed
Cooling Degree Days
2,279
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
What Sullivans IS's climate means for you
Sullivans IS runs 66°F a year - peaking in July, coldest in January.
- Gardeners get about 262 frost-free days, with the last spring freeze near March 13 - plan the planting calendar around it, not the regional average.
- Energy bills track 2,051 heating and 2,279 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: Sullivans IS, SC
Sullivans IS, South Carolina runs an annual average of 66°F, ranging from a mean daily high of 76°F to a mean daily low of 55°F, per NOAA's 1991–2020 climate normals. July is typically the warmest month of the year, while January is the coldest. Drawn from station USC00388405, these thirty-year averages smooth out year-to-year swings into a baseline for what a typical month looks like here.
Beyond temperature, Sullivans IS averages 51.6 inches of precipitation annually, predominantly as rainfall - a real factor for anyone planning to live, garden, or travel here. The frost-free season averages 262 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near March 13 and the first fall freeze near November 30. Turning to energy use, 2,051 heating degree days and 2,279 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Sullivans IS scores 82/100 (Excellent), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. Use the monthly tables above to plan around specific windows, shoulder seasons for mild highs and lows, peak summer for July-driven heat, or deep winter for January-driven cold. All figures here are thirty-year averages: any single year may run warmer, wetter, drier, or cooler than the normal, so treat them as planning guidance rather than forecasts.
Frequently Asked Questions
What is the average temperature in Sullivans IS, SC? ▼
The average annual temperature in Sullivans IS, South Carolina is 66°F. The warmest month averages 91°F (33°C) and the coldest averages 37°F (3°C).
How much rain does Sullivans IS get? ▼
Sullivans IS receives 51.6 inches of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Sullivans IS? ▼
Sullivans IS has a climate comfort score of 82/100 (Excellent), milder than 83% of U.S. cities in the PlainClimate database.
When is the growing season in Sullivans IS? ▼
Sullivans IS has approximately 262 frost-free days per year, with the last spring freeze around March 13 and the first fall freeze around November 30.
How much energy does heating and cooling require in Sullivans IS? ▼
Sullivans IS has 2,051 heating degree days and 2,279 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 Sullivans IS climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00388405 near Sullivans IS.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00388405. 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.