Congerville, IL Climate: Temperature & Rain by Month
Explore NOAA NCEI's 1991–2020 climate normals → and a clearly labeled PlainClimate comfort calculation
30-year climate normals (1991-2020) from Congerville's primary NOAA station, CONGERVILLE 2NW.
The climate verdict for Congerville
Congerville, Illinois has a mixed annual climate rather than one dominant extreme. Its NOAA normal shows an annual average of 52°F. Its climate comfort score of 59/100 (moderate) lands mid-pack nationally, exceeding 37% of station-mapped location scores.
- 52°F
- yearly average temperature, NOAA normal
- 59/100
- comfort score, above 37% of station-mapped location scores
- 37.5"
- annual precipitation · 22" snow
- 179 days
- frost-free growing season
Congerville: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00111836 · Congerville, IL 52°F mean · 37.5" precip
TEMP-COOL · RANK-MID · PHOTO-FINISH · PRCP-MID · SWING-WIDE · COMF-MID · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 52°F
- RANK-MID #3,362
- PHOTO-FINISH ≈ Golden
- PRCP-MID 37.5"
- SWING-WIDE 50°F
- COMF-MID 59/100
- LOAD-HEAT 5,752 HDD
- STN-1 USC00111836
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Golden, IL (+ 0 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every IL station list.
- Congerville (this station) 52°F
- Cold McDonald, KS 52°F
- Hot Chicago Midway, IL 52°F
- Near Golden, IL 52°F
- Near Linneus, MO 52°F
Climate Living Index · Congerville
Congerville: 60/100 · grade C
Congerville publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Congerville, not an official NOAA rating. Rankings still use Comfort Score 59/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 37.5 in · 2.5 from 35 in | 91/100 · A |
| Normal heat + freeze calendar | 123 calendar days | 63/100 · C |
| Annual temperature balance | 52.0°F · 15.5° from 67.5°F | 49/100 · D |
| Frost-free season | 179 days/year | 49/100 · D |
| Snowfall burden | 22.3 inches/year | 46/100 · D |
Congerville · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Congerville is a continental Köppen climate: Dfa
Coldest-month mean 25.2°F and warmest-month mean 75.2°F place this station in continental, no dry season, hot summer climates (Dfa). Class Dfa is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: continental, specifically continental, no dry season, hot summer.
- Köppen code
- Dfa
- Group
- Continental
- Warmest month
- 75.2°F
- Coldest month
- 25.2°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · heating-led station
Where Congerville sits across the climate record
Three NOAA fields for Congerville's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 49th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- 52nd percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- Wider than 81%
- Warmest-to-coldest month gap for Congerville is large versus 6,861 complete station-years.
How Congerville compares across U.S. station-mapped locations
Congerville's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
59 37th percentile score exceeds 37% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). Below this entry.
- 50–60: 1,329 station-mapped locations (21%). This entry sits in this band.
- 60–70: 1,236 station-mapped locations (20%). Above this entry.
- 70–80: 650 station-mapped locations (11%). Above this entry.
- 80–90: 921 station-mapped locations (15%). Above this entry.
- 90–100: 564 station-mapped locations (9%). Above this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 33°F (1°C) | 17°F (-8°C) | 25°F (-4°C) | 2.0" | 6.8" | 28.3 | 0.0 |
| February | 38°F (3°C) | 21°F (-6°C) | 29°F (-1°C) | 1.8" | 5.2" | 25.0 | 0.0 |
| March | 50°F (10°C) | 31°F (-1°C) | 41°F (5°C) | 2.4" | 2.8" | 21.1 | 0.0 |
| April | 63°F (17°C) | 41°F (5°C) | 52°F (11°C) | 3.8" | 0.8" | 7.4 | 0.0 |
| May | 74°F (23°C) | 52°F (11°C) | 63°F (17°C) | 4.8" | 0.0" | 0.8 | 1.2 |
| June | 83°F (28°C) | 61°F (16°C) | 72°F (22°C) | 4.0" | 0.0" | 0.0 | 4.8 |
| July | 86°F (30°C) | 65°F (18°C) | 75°F (24°C) | 3.9" | 0.0" | 0.0 | 7.7 |
| August | 84°F (29°C) | 63°F (17°C) | 73°F (23°C) | 3.7" | 0.0" | 0.0 | 5.4 |
| September | 80°F (27°C) | 55°F (13°C) | 67°F (19°C) | 3.2" | 0.0" | 0.1 | 4.0 |
| October | 67°F (19°C) | 43°F (6°C) | 55°F (13°C) | 3.1" | 0.0" | 6.3 | 0.4 |
| November | 51°F (11°C) | 32°F (0°C) | 42°F (5°C) | 2.6" | 1.5" | 17.9 | 0.0 |
| December | 39°F (4°C) | 23°F (-5°C) | 31°F (-1°C) | 2.0" | 5.2" | 26.6 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 86°F around July 10, short of 90°F on every date, while 123 dates carry a normal low at or below freezing, the coldest 16°F near January 20.
The freezing stretch
The normal low stays at or below 32°F into March 18, then returns to freezing around November 17, covering 123 dates in all.
Derived from the normal daily minimum. This is a different measure from the 50%-probability frost dates shown elsewhere on this page, which come from NOAA’s frost product.
Where the wet dates fall
The likeliest wet date is May 2, when 40% of years recorded at least a hundredth of an inch. The driest is September 5 at 25%. Summed across the calendar, that is about 110 wet dates a year.
The widest day
September 29 carries the biggest normal gap between afternoon and dawn, 26°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Congerville.
Monthly Precipitation
Average monthly rainfall and snowfall
Snow: 6.8"
8.5 days with precipitation
Snow: 5.2"
7.3 days with precipitation
Snow: 2.8"
9.4 days with precipitation
Snow: 0.8"
11.1 days with precipitation
12.2 days with precipitation
10.4 days with precipitation
8.9 days with precipitation
8.7 days with precipitation
7.1 days with precipitation
9.6 days with precipitation
Snow: 1.5"
8.3 days with precipitation
Snow: 5.2"
8.2 days with precipitation
Congerville spreads its precipitation across the year
Neither half of the year dominates here: June through August take 31% of the annual total and December through February 16%, with neither reaching the 35% that would mark a distinct wet season. Congerville has no dry season to plan around, though it does carry a wide 50°F gap between its warmest and coldest month.
The gap between the wettest and driest month still matters: May averages 4.8" and February 1.8". The three wettest months together take 34% of the year, against the 25% a perfectly flat distribution would give them.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. "Spread across the year" means neither the June-August nor the December-February share reaches 35%; it describes an average year, not the variability of any single one.
How Congerville's precipitation splits across the calendar
About 110 days a year record measurable precipitation here, carrying 37.5" between them, or roughly 0.34 inches on a typical wet day. That sits in the middle band: neither the many-light-days pattern of the Pacific Northwest and the Great Lakes, nor the few-heavy-events pattern of the Gulf and the desert Southwest.
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year and say nothing about the heaviest single storm on record.
Winter brings real snow to Congerville
Congerville averages 22.3 inches of snowfall a year, with January the snowiest month on the normals, spread across roughly 15 days that record measurable snow. That is depth accumulating on the ground, which is why it can exceed the annual precipitation figure: precipitation counts the liquid the snow melts down to, and fresh snow is mostly air.
- Annual snowfall: 22.3 inches of depth.
- Days recording measurable snow: about 15 a year.
- At a rough ten-to-one melt ratio, snow accounts for on the order of 6% of the year's precipitation.
NOAA 1991-2020 normals. The ten-to-one ratio is a convention, not a measurement: real ratios vary with temperature, so treat the share as an order of magnitude rather than an exact split.
Frost Dates & Growing Season
First Fall Freeze
October 17
50% probability date
Last Spring Freeze
April 21
50% probability date
Growing Season
179 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
5,752
Higher = more heating needed
Cooling Degree Days
1,067
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside IL closest to Congerville on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (52°F here).
- Arapahoe, CO 52°F · 0.0°F off
- Farmington, UT 52°F · 0.0°F off
- Frankfort, KS 52°F · 0.0°F off
- Hamilton, MO 52°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (37.5" here), excluding temperature-peer places.
- La Crosse, WI 37.5" · 0.0" off
- Wisconsin Dells, WI 37.5" · 0.0" off
- Albany, MO 37.5" · 0.0" off
- Fremont, MI 37.5" · 0.0" off
Snow and freeze rhythm
When cold and snow define Congerville
heating led · moderate · mid swing
Congerville's energy balance leans toward cold weather: 5,752 annual heating degree days against 1,067 for cooling. Its 50.0°F seasonal range still makes the monthly rows more useful than the annual average alone.
Congerville's frost-free season lasts about 179 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
-
1. Congerville coldest normal
January
Averaging 25°F (-4°C), this month sits below freezing for the month as a whole, not merely overnight.
-
2. Congerville typical freeze period
January through December
The station reports average freezing days from January through December.
-
3. Congerville snow peak
January
Congerville averages 22.3 inches of snow a year, with January the snowiest month on the normals.
Questions about Congerville's climate
How much snow does Congerville get? ▼
How cold does Congerville get in winter? ▼
How much energy does heating and cooling require in Congerville? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Congerville's primary station: CONGERVILLE 2NW (USC00111836). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The 2024 Census Gazetteer identifies the exact name-and-state match as an incorporated place (GEOID 1716119). Match rule for Congerville: exact normalized name + state only, no fuzzy expansion, so nearby differently spelled facilities stay unmatched.
On this page every temperature, precipitation, and derived score for Congerville comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.