Climate Comfort Score
78/100
Good
NOAA 1991–2020 normals 58°F annual avg Public-domain federal data
Grand Chain Dam, IL Climate
Temperature, precipitation, and comfort score from NOAA NCEI 1991–2020 normals →
- 58°F
- Avg annual temp
- 78/100
- Comfort score
- 49.4"
- Annual precip
- 216d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Grand Chain Dam
Grand Chain Dam, Illinois averages 58°F a year and scores 78/100 on the comfort index - good, milder than 74% of U.S. cities.
- 58°F
- yearly average temperature, NOAA normal
- 78/100
- comfort score, milder than 74% of U.S. cities
- 49.4"
- annual precipitation · 7" snow
- 216 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
58°F (14°C)
Avg High
68°F
Avg Low
48°F
Annual Precip
49.4"
Annual Snow
7.2"
Comfort Score
78/100
Good
Avg Annual Temperature
58°F
30-year mean (NOAA NCEI)
Annual Precipitation
49.4"
Plus 7.2" of snow
Comfort score vs national 100-point ceiling (Grand Chain Dam) 78.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Good for the Grand Chain Dam area.
How Grand Chain Dam compares to every U.S. city
Grand Chain Dam'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 Grand Chain Dam
MethodologyThe chart below traces how the U.S. land temperature anomaly has moved against the global mean since 1900. For Grand Chain Dam, 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 | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 43°F (6°C) | 26°F (-3°C) | 35°F (1°C) | 4.2" | 2.1" | 22.9 | 0.0 |
| February | 48°F (9°C) | 30°F (-1°C) | 39°F (4°C) | 3.9" | 2.5" | 17.6 | 0.0 |
| March | 57°F (14°C) | 37°F (3°C) | 47°F (8°C) | 4.8" | 0.7" | 10.3 | 0.0 |
| April | 68°F (20°C) | 47°F (8°C) | 58°F (14°C) | 5.2" | 0.0" | 1.3 | 0.0 |
| May | 77°F (25°C) | 56°F (14°C) | 67°F (19°C) | 4.9" | 0.0" | 0.0 | 0.4 |
| June | 86°F (30°C) | 65°F (18°C) | 75°F (24°C) | 4.1" | 0.0" | 0.0 | 7.7 |
| July | 89°F (32°C) | 69°F (20°C) | 79°F (26°C) | 3.3" | 0.0" | 0.0 | 15.0 |
| August | 89°F (31°C) | 67°F (20°C) | 78°F (26°C) | 3.0" | 0.0" | 0.0 | 13.2 |
| September | 83°F (28°C) | 60°F (16°C) | 72°F (22°C) | 3.4" | 0.0" | 0.0 | 4.7 |
| October | 71°F (22°C) | 48°F (9°C) | 60°F (15°C) | 4.0" | 0.1" | 0.8 | 0.4 |
| November | 58°F (14°C) | 39°F (4°C) | 48°F (9°C) | 4.4" | 0.0" | 9.4 | 0.0 |
| December | 47°F (8°C) | 31°F (-1°C) | 39°F (4°C) | 4.2" | 1.8" | 18.0 | 0.0 |
Monthly Precipitation
Average monthly rainfall and snowfall
January 4.2"
Snow: 2.1"
9.9 days with precipitation
February 3.9"
Snow: 2.5"
9.5 days with precipitation
March 4.8"
Snow: 0.7"
10.4 days with precipitation
April 5.2"
10.1 days with precipitation
May 4.9"
10.4 days with precipitation
June 4.1"
9.3 days with precipitation
July 3.3"
7.8 days with precipitation
August 3.0"
6.4 days with precipitation
September 3.4"
6.8 days with precipitation
October 4.0"
Snow: 0.1"
7.7 days with precipitation
November 4.4"
8.4 days with precipitation
December 4.2"
Snow: 1.8"
10.0 days with precipitation
Frost Dates & Growing Season
First Fall Freeze
November 5
50% probability date
Last Spring Freeze
April 3
50% probability date
Growing Season
216 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
4,102
Higher = more heating needed
Cooling Degree Days
1,546
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
What Grand Chain Dam's climate means for you
Grand Chain Dam runs 58°F a year - peaking in July, coldest in January.
- Gardeners get about 216 frost-free days, with the last spring freeze near April 3 - plan the planting calendar around it, not the regional average.
- Energy bills track 4,102 heating and 1,546 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: Grand Chain Dam, IL
An annual average temperature of 58°F, ranging from a mean daily high of 68°F to a mean daily low of 48°F is what the NOAA 1991–2020 climate normals report for Grand Chain Dam, Illinois. July is typically the warmest month of the year, while January is the coldest. That baseline comes from station USC00113580 and thirty years of averaging, so it reflects a typical month rather than any one year's swings.
Precipitation patterns matter as much as temperature for anyone planning to live, garden, or travel here. Grand Chain Dam receives roughly 49.4 inches of precipitation each year, with 7.2 inches typically falling as snow. The frost-free season averages 216 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near April 3 and the first fall freeze near November 5. For energy use, 4,102 heating degree days and 1,546 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Grand Chain Dam scores 78/100 (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 Grand Chain Dam, IL? ▼
The average annual temperature in Grand Chain Dam, Illinois is 58°F. The warmest month averages 89°F (32°C) and the coldest averages 26°F (-3°C).
How much rain does Grand Chain Dam get? ▼
Grand Chain Dam receives 49.4 inches of precipitation annually, including 7.2 inches of snow. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Grand Chain Dam? ▼
Grand Chain Dam 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 Grand Chain Dam? ▼
Grand Chain Dam has approximately 216 frost-free days per year, with the last spring freeze around April 3 and the first fall freeze around November 5.
How much energy does heating and cooling require in Grand Chain Dam? ▼
Grand Chain Dam has 4,102 heating degree days and 1,546 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 Grand Chain Dam climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00113580 near Grand Chain Dam.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00113580. 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.