Climate Comfort Score
77/100
Good
2026 data Public-data reference. official source
Sullivans IS, SC Climate
Temperature, precipitation, and comfort score from NOAA NCEI 1991-2020 normals →
30-year climate normals from 1 weather station (1991-2020).
Sullivans IS, South Carolina has an average annual temperature of 66°F and a climate comfort score of 77/100 (Good). Annual precipitation totals 51.6". Based on NOAA 30-year normals (1991–2020).
Avg Temperature
66°F (19°C)
Avg High
76°F
Avg Low
55°F
Annual Precip
51.6"
Comfort Score
77/100
Good
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) 77.0%
National median (≈55)
PlainClimate composite — temperature mildness, humidity, precipitation, extreme-weather frequency. Good for the Sullivans IS area.
Warming context for Sullivans IS
MethodologyHow the U.S. land temperature anomaly tracks against the global mean since 1900. The current NOAA 1991-2020 normal for Sullivans IS captures average conditions across the spread shown — the most recent decade is 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
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
Related Data
PlainEnviro
EPA environmental data — pollution, water quality, and environmental health by location
PlainCarbon
Carbon emissions data — greenhouse gas reporting and facility-level CO2 data
PlainHazard
Natural disaster data — weather-related hazards, FEMA declarations, and risk profiles
PlainAirData
EPA air quality data — AQI readings, pollutant levels, and air quality trends
Climate Guides
Climate Insight: Sullivans IS, SC
The NOAA 1991–2020 climate normals describe Sullivans IS, South Carolina as a location with an annual average temperature of 66°F, ranging from a mean daily high of 76°F to a mean daily low of 55°F. July is typically the warmest month of the year, while January is the coldest. These thirty-year averages, computed from station USC00388405, smooth out year-to-year variability and give a baseline expectation for typical conditions in any given month.
Precipitation patterns matter as much as temperature for anyone planning to live, garden, or travel here. Sullivans IS receives roughly 51.6 inches of precipitation each year, predominantly as rainfall. Growing-season length varies with elevation and microclimate, with the last spring freeze near March 13 and the first fall freeze near November 30. For 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 77/100 (Good), 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 77/100 (Good). This score considers temperature mildness, humidity, precipitation, and extreme weather frequency.
When is the growing season in Sullivans IS? ▼
Growing season data is not available for Sullivans IS.
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. Higher heating degree days indicate greater winter energy demand, while higher cooling degree days indicate greater summer cooling needs.
Where does this Sullivans IS climate data come from? ▼
All climate data comes from NOAA U.S. Climate Normals v1.0.1, covering the 30-year period from 1991 to 2020. Data is collected from weather station USC00388405. These 30-year averages are the standard reference for typical weather conditions.
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
