Climate Comfort Score
68/100
Good
NOAA 1991–2020 normals 54°F annual avg Public-domain federal data
Shelbyville Dam, IL Climate
Pulled from NOAA NCEI 1991–2020 normals →: average temperature, precipitation, and comfort score
- 54°F
- Avg annual temp
- 68/100
- Comfort score
- 41.4"
- Annual precip
- 197d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Shelbyville Dam
Shelbyville Dam, Illinois averages 54°F a year and scores 68/100 on the comfort index - good, milder than 58% of U.S. cities.
- 54°F
- annual average temperature (NOAA normal)
- 68/100
- comfort score, milder than 58% of U.S. cities
- 41.4"
- annual precipitation
- 197 days
- frost-free growing season
Based on NOAA U.S. Climate Normals (1991–2020) - 30-year averages describing the typical year, not a forecast.
Avg Temperature
54°F (12°C)
Avg High
63°F
Avg Low
44°F
Annual Precip
41.4"
Comfort Score
68/100
Good
Avg Annual Temperature
54°F
30-year mean (NOAA NCEI)
Annual Precipitation
41.4"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Shelbyville Dam) 68.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Good for the Shelbyville Dam area.
How Shelbyville Dam compares to every U.S. city
Shelbyville Dam's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
68 Top 42% higher than 58% 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 Shelbyville Dam
MethodologySince 1900, U.S. land temperatures have tracked (and diverged from) the global mean - the chart below shows how. Shelbyville Dam's current NOAA 1991-2020 normal sits within that longer spread, and the most recent decade runs 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 | 36°F (2°C) | 19°F (-7°C) | 28°F (-2°C) | 2.6" | 27.1 | 0.0 |
| February | 41°F (5°C) | 23°F (-5°C) | 32°F (0°C) | 2.1" | 23.2 | 0.0 |
| March | 52°F (11°C) | 32°F (0°C) | 42°F (6°C) | 2.7" | 17.5 | 0.0 |
| April | 64°F (18°C) | 43°F (6°C) | 54°F (12°C) | 4.3" | 3.7 | 0.0 |
| May | 74°F (23°C) | 54°F (12°C) | 64°F (18°C) | 4.7" | 0.1 | 0.5 |
| June | 83°F (28°C) | 63°F (17°C) | 73°F (23°C) | 4.7" | 0.0 | 5.1 |
| July | 86°F (30°C) | 67°F (19°C) | 76°F (25°C) | 4.1" | 0.0 | 8.9 |
| August | 85°F (29°C) | 65°F (18°C) | 75°F (24°C) | 3.4" | 0.0 | 6.8 |
| September | 80°F (26°C) | 57°F (14°C) | 68°F (20°C) | 3.1" | 0.0 | 4.1 |
| October | 67°F (19°C) | 45°F (7°C) | 56°F (13°C) | 3.6" | 2.5 | 0.3 |
| November | 52°F (11°C) | 34°F (1°C) | 43°F (6°C) | 3.7" | 14.7 | 0.0 |
| December | 41°F (5°C) | 25°F (-4°C) | 33°F (0°C) | 2.6" | 24.7 | 0.0 |
Monthly Precipitation
Average monthly rainfall
January 2.6"
8.1 days with precipitation
February 2.1"
7.6 days with precipitation
March 2.7"
9.3 days with precipitation
April 4.3"
10.3 days with precipitation
May 4.7"
12.8 days with precipitation
June 4.7"
10.3 days with precipitation
July 4.1"
8.6 days with precipitation
August 3.4"
7.9 days with precipitation
September 3.1"
7.4 days with precipitation
October 3.6"
9.1 days with precipitation
November 3.7"
8.4 days with precipitation
December 2.6"
8.3 days with precipitation
Frost Dates & Growing Season
First Fall Freeze
October 24
50% probability date
Last Spring Freeze
April 10
50% probability date
Growing Season
197 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
5,321
Higher = more heating needed
Cooling Degree Days
1,186
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
What Shelbyville Dam's climate means for you
Shelbyville Dam runs 54°F a year - peaking in July, coldest in January.
- Gardeners get about 197 frost-free days, with the last spring freeze near April 10 - plan the planting calendar around it, not the regional average.
- Energy bills track 5,321 heating and 1,186 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: Shelbyville Dam, IL
Shelbyville Dam, Illinois runs an annual average of 54°F, ranging from a mean daily high of 63°F to a mean daily low of 44°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 USC00117876, these thirty-year averages smooth out year-to-year swings into a baseline for what a typical month looks like here.
Precipitation patterns matter as much as temperature for anyone planning to live, garden, or travel here. Shelbyville Dam receives roughly 41.4 inches of precipitation each year, predominantly as rainfall. The frost-free season averages 197 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near April 10 and the first fall freeze near October 24. For energy use, 5,321 heating degree days and 1,186 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Shelbyville Dam scores 68/100 (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 Shelbyville Dam, IL? ▼
The average annual temperature in Shelbyville Dam, Illinois is 54°F. The warmest month averages 86°F (30°C) and the coldest averages 19°F (-7°C).
How much rain does Shelbyville Dam get? ▼
Shelbyville Dam receives 41.4 inches of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Shelbyville Dam? ▼
Shelbyville Dam has a climate comfort score of 68/100 (Good), milder than 58% of U.S. cities in the PlainClimate database.
When is the growing season in Shelbyville Dam? ▼
Shelbyville Dam has approximately 197 frost-free days per year, with the last spring freeze around April 10 and the first fall freeze around October 24.
How much energy does heating and cooling require in Shelbyville Dam? ▼
Shelbyville Dam has 5,321 heating degree days and 1,186 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 Shelbyville Dam climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00117876 near Shelbyville Dam.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00117876. 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.