Climate Comfort Score
78/100
Good
NOAA 1991–2020 normals 56°F annual avg Public-domain federal data
Carbondale Southern IL, IL Climate
Average temperature, precipitation, and a comfort score, drawn from NOAA NCEI 1991–2020 normals →
- 56°F
- Avg annual temp
- 78/100
- Comfort score
- 44.0"
- Annual precip
- 196d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Carbondale Southern IL
Carbondale Southern IL, Illinois averages 56°F a year and scores 78/100 on the comfort index - good, milder than 74% of U.S. cities.
- 56°F
- average temperature, NOAA 1991-2020 normal
- 78/100
- comfort score, milder than 74% of U.S. cities
- 44.0"
- precipitation, annual total
- 196 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
56°F (14°C)
Avg High
67°F
Avg Low
46°F
Annual Precip
44.0"
Comfort Score
78/100
Good
Avg Annual Temperature
56°F
30-year mean (NOAA NCEI)
Annual Precipitation
44.0"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Carbondale Southern IL) 78.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Good for the Carbondale Southern IL area.
How Carbondale Southern IL compares to every U.S. city
Carbondale Southern IL'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 Carbondale Southern IL
MethodologyCarbondale Southern IL'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 | 42°F (5°C) | 25°F (-4°C) | 33°F (1°C) | 2.8" | 24.5 | 0.0 |
| February | 47°F (8°C) | 28°F (-2°C) | 38°F (3°C) | 2.6" | 19.3 | 0.0 |
| March | 57°F (14°C) | 36°F (2°C) | 47°F (8°C) | 4.1" | 11.3 | 0.0 |
| April | 68°F (20°C) | 45°F (7°C) | 57°F (14°C) | 5.3" | 2.5 | 0.0 |
| May | 77°F (25°C) | 55°F (13°C) | 66°F (19°C) | 5.0" | 0.0 | 1.0 |
| June | 86°F (30°C) | 64°F (18°C) | 75°F (24°C) | 4.1" | 0.0 | 9.6 |
| July | 88°F (31°C) | 68°F (20°C) | 78°F (26°C) | 3.6" | 0.0 | 14.4 |
| August | 87°F (31°C) | 65°F (18°C) | 76°F (24°C) | 3.0" | 0.0 | 10.7 |
| September | 81°F (27°C) | 56°F (13°C) | 68°F (20°C) | 2.9" | 0.0 | 4.4 |
| October | 70°F (21°C) | 45°F (7°C) | 57°F (14°C) | 3.5" | 2.5 | 0.3 |
| November | 56°F (13°C) | 35°F (2°C) | 46°F (8°C) | 3.9" | 12.8 | 0.0 |
| December | 46°F (8°C) | 28°F (-2°C) | 37°F (3°C) | 3.1" | 21.5 | 0.0 |
Monthly Precipitation
Average monthly rainfall
January 2.8"
8.4 days with precipitation
February 2.6"
9.3 days with precipitation
March 4.1"
11.4 days with precipitation
April 5.3"
11.4 days with precipitation
May 5.0"
14.1 days with precipitation
June 4.1"
11.2 days with precipitation
July 3.6"
12.1 days with precipitation
August 3.0"
11.9 days with precipitation
September 2.9"
11.1 days with precipitation
October 3.5"
9.7 days with precipitation
November 3.9"
9.5 days with precipitation
December 3.1"
9.8 days with precipitation
Frost Dates & Growing Season
First Fall Freeze
October 22
50% probability date
Last Spring Freeze
April 9
50% probability date
Growing Season
196 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
4,460
Higher = more heating needed
Cooling Degree Days
1,370
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
What Carbondale Southern IL's climate means for you
Carbondale Southern IL runs 56°F a year - peaking in July, coldest in January.
- Gardeners get about 196 frost-free days, with the last spring freeze near April 9 - plan the planting calendar around it, not the regional average.
- Energy bills track 4,460 heating and 1,370 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: Carbondale Southern IL, IL
An annual average temperature of 56°F, ranging from a mean daily high of 67°F to a mean daily low of 46°F is what the NOAA 1991–2020 climate normals report for Carbondale Southern IL, Illinois. July is typically the warmest month of the year, while January is the coldest. That baseline comes from station USW00093810 and thirty years of averaging, so it reflects a typical month rather than any one year's swings.
Beyond temperature, Carbondale Southern IL averages 44.0 inches of precipitation annually, predominantly as rainfall - a real factor for anyone planning to live, garden, or travel here. The frost-free season averages 196 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near April 9 and the first fall freeze near October 22. Turning to energy use, 4,460 heating degree days and 1,370 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Carbondale Southern IL scores 78/100 (Good), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. Shoulder seasons bring the mildest highs and lows in the monthly tables above, summer brings July-driven heat, and winter brings January-driven cold - use that rhythm for planning. These figures are thirty-year averages rather than forecasts, so a specific year may still run warmer, cooler, wetter, or drier than what's shown.
Frequently Asked Questions
What is the average temperature in Carbondale Southern IL, IL? ▼
The average annual temperature in Carbondale Southern IL, Illinois is 56°F. The warmest month averages 88°F (31°C) and the coldest averages 25°F (-4°C).
How much rain does Carbondale Southern IL get? ▼
Carbondale Southern IL receives 44.0 inches of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Carbondale Southern IL? ▼
Carbondale Southern IL 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 Carbondale Southern IL? ▼
Carbondale Southern IL has approximately 196 frost-free days per year, with the last spring freeze around April 9 and the first fall freeze around October 22.
How much energy does heating and cooling require in Carbondale Southern IL? ▼
Carbondale Southern IL has 4,460 heating degree days and 1,370 cooling degree days annually, a heating-dominated climate. 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 Carbondale Southern IL climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USW00093810 near Carbondale Southern IL.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USW00093810. 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.