West Chicago Dupage, IL Climate: Temperature & Rain by Month
Pulled from NOAA NCEI 1991–2020 normals →: climate measurements used in PlainClimate's documented score
30-year climate normals (1991-2020) from West Chicago Dupage's primary NOAA station, WEST CHICAGO DUPAGE AP.
The climate verdict for West Chicago Dupage
West Chicago Dupage, Illinois has a mixed annual climate rather than one dominant extreme. Its NOAA normal shows an annual average of 50°F. Its climate comfort score of 64/100 (good) lands mid-pack nationally, exceeding 49% of station-mapped location scores.
- 50°F
- yearly average temperature, NOAA normal
- 64/100
- comfort score, above 49% of station-mapped location scores
- 33.2"
- precipitation, annual total
- 177 days
- growing season, frost-free days
West Chicago Dupage: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USW00094892 · West Chicago Dupage, IL 50°F mean · 33.2" precip
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-MID · SWING-WIDE · COMF-MID · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 50°F
- RANK-COOL #2,607
- PHOTO-FINISH ≈ Big Springs
- PRCP-MID 33.2"
- SWING-WIDE 50°F
- COMF-MID 64/100
- LOAD-HEAT 6,364 HDD
- STN-1 USW00094892
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Big Springs, NE (+ 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.
- West Chicago Du… (this station) 50°F
- Cold Chicago Botanic…, IL 50°F
- Hot Lowell, IN 50°F
- Near Big Springs, NE 50°F
- Near Mt Pleasant, IA 50°F
Climate Living Index · West Chicago Dupage
West Chicago Dupage: 56/100 · grade C
West Chicago Dupage publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals · NOAA hourly normals); 1 missing weight rescale to 100.
PlainClimate-derived for West Chicago Dupage, not an official NOAA rating. Rankings still use Comfort Score 64/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 33.2 in · 1.8 from 35 in | 92/100 · A |
| Normal heat + freeze calendar | 137 calendar days | 55/100 · C |
| Summer moisture balance | 61.3°F mean dew point | 54/100 · D |
| Frost-free season | 177 days/year | 48/100 · D |
| Annual temperature balance | 49.7°F · 17.8° from 67.5°F | 39/100 · F |
West Chicago Dupage · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
West Chicago Dupage is a continental Köppen climate: Dfa
Coldest-month mean 23.3°F and warmest-month mean 73.7°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
- 73.7°F
- Coldest month
- 23.3°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 West Chicago Dupage sits across the climate record
Three NOAA fields for West Chicago Dupage's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 38th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- 45th percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- Wider than 82%
- Warmest-to-coldest month gap for West Chicago Dupage is large versus 6,861 complete station-years.
How West Chicago Dupage compares across U.S. station-mapped locations
West Chicago Dupage's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
64 49th percentile score exceeds 49% 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%). Below this entry.
- 60–70: 1,236 station-mapped locations (20%). This entry sits in this band.
- 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
West Chicago Dupage's measured station temperature trend
MethodologyAcross 32 complete annual observations from 1974 to 2025, WEST CHICAGO DUPAGE AP warmed at a fitted rate of 0.16°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- West Chicago Dupage primary station fitted change +0.16 °C/decade
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 31°F (-1°C) | 16°F (-9°C) | 23°F (-5°C) | 1.3" | 28.7 | 0.0 |
| February | 35°F (2°C) | 19°F (-7°C) | 27°F (-3°C) | 1.2" | 25.5 | 0.0 |
| March | 47°F (8°C) | 28°F (-2°C) | 38°F (3°C) | 2.0" | 21.4 | 0.0 |
| April | 60°F (15°C) | 38°F (3°C) | 49°F (9°C) | 3.4" | 8.2 | 0.0 |
| May | 71°F (22°C) | 49°F (9°C) | 60°F (15°C) | 4.3" | 0.9 | 0.7 |
| June | 81°F (27°C) | 59°F (15°C) | 70°F (21°C) | 3.6" | 0.0 | 3.6 |
| July | 84°F (29°C) | 63°F (17°C) | 74°F (23°C) | 3.6" | 0.0 | 5.6 |
| August | 82°F (28°C) | 62°F (17°C) | 72°F (22°C) | 3.8" | 0.0 | 2.9 |
| September | 76°F (24°C) | 54°F (12°C) | 65°F (18°C) | 3.0" | 0.0 | 1.7 |
| October | 62°F (17°C) | 42°F (6°C) | 52°F (11°C) | 3.0" | 5.4 | 0.0 |
| November | 48°F (9°C) | 31°F (0°C) | 39°F (4°C) | 2.2" | 17.2 | 0.0 |
| December | 35°F (2°C) | 21°F (-6°C) | 28°F (-2°C) | 1.7" | 26.5 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 84°F around July 11, short of 90°F on every date, while 137 dates carry a normal low at or below freezing, the coldest 15°F near January 21.
The freezing stretch
The normal low stays at or below 32°F into March 28, then returns to freezing around November 13, covering 137 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 10, when 44% of years recorded at least a hundredth of an inch. The driest is February 18 at 25%. Summed across the calendar, that is about 121 wet dates a year.
The widest day
May 9 carries the biggest normal gap between afternoon and dawn, 22°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for West Chicago Dupage.
Where West Chicago Dupage Stands Nationally
Days and nights track unusually close together; the widest normal swing, about 22°F, is narrower than most stations record.
West Chicago Dupage earns one nationally notable standing (outer quintile) against 6,860 NOAA 1991–2020 normals stations, middle-of-the-pack metrics stay silent here.
Monthly Precipitation
Average monthly rainfall
8.2 days with precipitation
7.2 days with precipitation
9.4 days with precipitation
11.6 days with precipitation
13.6 days with precipitation
11.6 days with precipitation
10.2 days with precipitation
10.9 days with precipitation
10.0 days with precipitation
10.8 days with precipitation
8.5 days with precipitation
8.7 days with precipitation
West Chicago Dupage spreads its precipitation across the year
Neither half of the year dominates here: June through August take 33% of the annual total and December through February 13%, with neither reaching the 35% that would mark a distinct wet season. West Chicago Dupage has no dry season to plan around, though it does carry a wide 50.4°F gap between its warmest and coldest month.
The gap between the wettest and driest month still matters: May averages 4.3" and February 1.2". The three wettest months together take 36% 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 West Chicago Dupage's precipitation splits across the calendar
About 121 days a year record measurable precipitation here, carrying 33.2" between them, or roughly 0.28 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.
Frost Dates & Growing Season
First Fall Freeze
October 19
50% probability date
Last Spring Freeze
April 25
50% probability date
Growing Season
177 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
6,364
Higher = more heating needed
Cooling Degree Days
822
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Humidity & Wind
Monthly averages from hourly observations
| Month | Humidity | Wind (mph) | Clear Sky % | Overcast % |
|---|---|---|---|---|
| January | 75% | 10.4 | 43% | 39% |
| February | 72% | 10.8 | 42% | 40% |
| March | 66% | 11.0 | 44% | 31% |
| April | 64% | 10.5 | 48% | 27% |
| May | 67% | 9.0 | 52% | 20% |
| June | 69% | 8.0 | 56% | 10% |
| July | 71% | 7.0 | 59% | 9% |
| August | 72% | 7.2 | 62% | 12% |
| September | 70% | 8.5 | 59% | 18% |
| October | 71% | 10.0 | 49% | 33% |
| November | 76% | 10.3 | 44% | 40% |
| December | 78% | 10.6 | 43% | 43% |
Nationwide similar cities
Other rankable U.S. places outside IL closest to West Chicago Dupage 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 (50°F here).
- Ashland, OH 50°F · 0.0°F off
- Baring, WA 50°F · 0.0°F off
- Benton Harbor, MI 50°F · 0.0°F off
- Big Springs, NE 50°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (33.2" here), excluding temperature-peer places.
- Kingman, KS 33.2" · 0.0" off
- Frankfort, KS 33.2" · 0.0" off
- Grayling, MI 33.2" · 0.0" off
- Cross Village, MI 33.2" · 0.0" off
Data-derived climate profile
How West Chicago Dupage's climate pattern fits together
heating led · moderate · mid swing
West Chicago Dupage's energy balance leans toward cold weather: 6,364 annual heating degree days against 822 for cooling. Its 50.4°F seasonal range still makes the monthly rows more useful than the annual average alone.
West Chicago Dupage's frost-free season lasts about 177 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
July and January mark the typical warm and cold ends of the calendar in West Chicago Dupage's middle-range seasonal profile. The measured spread is 50.4°F. The annual average is 50°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
West Chicago Dupage's 33.2 inches of annual precipitation falls in PlainClimate's middle band, so “wet” or “dry” is not the leading description. Snowfall is not added to the interpretation because its annual value is missing. Temperature balance and the calendar distribution carry more information than the annual moisture label alone.
These labels group NOAA 1991-2020 normals from West Chicago Dupage's primary station, so the winter figures are a thirty-year average and not a floor: a single hard season can run well below them. Treat each band as a descriptive range for West Chicago Dupage, not an official NOAA class or a year-ahead forecast.
Questions about West Chicago Dupage's climate
How much rain does West Chicago Dupage get? ▼
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Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from West Chicago Dupage's primary station: WEST CHICAGO DUPAGE AP (USW00094892). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The conservative exact name-and-state crosswalk finds no Census place match, so PlainClimate treats this as a station-mapped location and does not claim it is a municipality. No exact Gazetteer row for West Chicago Dupage; facility counts that depend on place identity are therefore an upper bound, not a municipal census.
On this page every temperature, precipitation, and derived score for West Chicago Dupage 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.