Chicago Aurora Municipal Airport, Illinois climate: Climate normals at a NOAA weather station
Chicago Aurora Municipal Airport's normal year runs from 15°F January nights to 84°F July afternoons, with 33.8 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.7°C, January lows of −10°C, July highs of 29°C, 860 mm of precipitation a year.
- NOAA stationChicago Aurora Municipal Airport
- Station IDUSW00004808
- Location41.77°N 88.48°W
- Elevation710 ft (216 m)
On October 23, the normal high in Chicago Aurora Municipal Airport is 60°F and the normal low 38°F, and the chance of measurable rain or snow is 34%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Chicago Aurora Municipal Airport.
- Jan 31° 15°
- Feb 35° 18°
- Mar 48° 28°
- Apr 60° 37°
- May 72° 49°
- Jun 81° 59°
- Jul 84° 62°
- Aug 82° 60°
- Sep 76° 52°
- Oct 63° 41°
- Nov 48° 29°
- Dec 36° 21°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like at Chicago Aurora Municipal Airport each month?
July is the warmest month, with normal highs of 84°F; January the coldest, with normal lows of 15°F. The most precipitation falls in May (4.06 in), the least in January (1.30 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 31°F | 15°F | 22.6°F | 1.30 | 8 | <1 | 29 | 9 h 30 min |
| February | 35°F | 18°F | 26.5°F | 1.41 | 7 | <1 | 26 | 10 h 30 min |
| March | 48°F | 28°F | 37.8°F | 2.21 | 10 | <1 | 23 | 11 h 50 min |
| April | 60°F | 37°F | 48.8°F | 3.60 | 12 | <1 | 10 | 13 h 20 min |
| May | 72°F | 49°F | 60.4°F | 4.06 | 14 | 1 | 1 | 14 h 30 min |
| June | 81°F | 59°F | 69.9°F | 3.98 | 13 | 4 | <1 | 15 h 10 min |
| July | 84°F | 62°F | 73.1°F | 3.71 | 11 | 6 | <1 | 15 h |
| August | 82°F | 60°F | 70.9°F | 3.35 | 12 | 3 | <1 | 13 h 50 min |
| September | 76°F | 52°F | 63.9°F | 3.01 | 11 | 2 | <1 | 12 h 30 min |
| October | 63°F | 41°F | 51.9°F | 3.23 | 11 | <1 | 8 | 11 h 10 min |
| November | 48°F | 29°F | 38.6°F | 2.30 | 9 | <1 | 19 | 9 h 50 min |
| December | 36°F | 21°F | 28.2°F | 1.68 | 9 | <1 | 27 | 9 h 10 min |
| Year (annual) | 60°F | 39°F | 49.4°F | 33.84 | 127 | 16 | 142 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | −1°C | −10°C | −5.2°C | 33 mm |
| February | 2°C | −8°C | −3.1°C | 36 mm |
| March | 9°C | −2°C | 3.2°C | 56 mm |
| April | 16°C | 3°C | 9.3°C | 91 mm |
| May | 22°C | 9°C | 15.8°C | 103 mm |
| June | 27°C | 15°C | 21.1°C | 101 mm |
| July | 29°C | 17°C | 22.8°C | 94 mm |
| August | 28°C | 15°C | 21.6°C | 85 mm |
| September | 25°C | 11°C | 17.7°C | 76 mm |
| October | 17°C | 5°C | 11.1°C | 82 mm |
| November | 9°C | −2°C | 3.7°C | 58 mm |
| December | 2°C | −6°C | −2.1°C | 43 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Aurora (9 miles away), gets 28 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00004808; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
Which months are mildest at Chicago Aurora Municipal Airport?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, July has the fewest days with rain (11).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00004808.
When is the last frost at Chicago Aurora Municipal Airport?
In Chicago Aurora Municipal Airport, the last spring frost (32°F) comes after April 28 in half of years and after May 11 in one year in ten; the first autumn frost comes before October 13 in half of years and before September 27 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- April 281 year in 10 after May 11; 9 in 10 after April 14
- First autumn frost, half of years before
- October 131 year in 10 before September 27; 9 in 10 before October 24
NOAA puts the median frost-free season at 166 days, and the season without a hard freeze (28°F) at 187 days.
A hard freeze (28°F) comes after April 18 in half of springs and before October 23 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Chicago Aurora Municipal Airport in zone 5b in ZIP code 60554, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, the station is in zone 5a: the coldest night of a typical year reaches −16°F (21 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in Illinois · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USW00004808; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get at Chicago Aurora Municipal Airport?
In a normal year in Chicago Aurora Municipal Airport, 16 days a year reach 90°F, 142 nights fall to 32°F or colder and 127 days bring measurable precipitation.
- Days at 90°F or more
- 16a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 142a normal year
- Days that stay below freezing
- 47high of 32°F or less
- Days with 0.01 inch of precipitation
- 127a normal year
The highest temperature in this station's record (since 1998) is 102°F, on July 7, 2012; the lowest is −33°F, on January 16, 2009.
The wettest calendar year on that record is 2019, with 45.28 in.
Source: NOAA NCEI 1991-2020 annual normals, station USW00004808; records: ACIS (NOAA Regional Climate Centers), station USW00004808. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Chicago Aurora Municipal Airport?
Over a year 73% of the sunlight that would reach the ground under clear skies gets through the clouds at Chicago Aurora Municipal Airport, 3.9 kWh per square metre a day. July is the sunniest month (81%) and January the cloudiest (61%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 61% | 1.7 |
| February | 65% | 2.6 |
| March | 67% | 3.6 |
| April | 70% | 4.8 |
| May | 71% | 5.5 |
| June | 77% | 6.1 |
| July | 81% | 6.2 |
| August | 80% | 5.4 |
| September | 80% | 4.5 |
| October | 71% | 3.0 |
| November | 67% | 2.0 |
| December | 61% | 1.5 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How many heating and cooling degree days does Chicago Aurora Municipal Airport record?
A normal year at Chicago Aurora Municipal Airport brings 6,433 heating degree days, 20% more than the median U.S. place (5,373), and 781 cooling degree days, 14% fewer than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 3,013 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,314 | 0 |
| February | 1,079 | 0 |
| March | 845 | 1 |
| April | 491 | 5 |
| May | 197 | 56 |
| June | 29 | 177 |
| July | 6 | 257 |
| August | 12 | 193 |
| September | 113 | 80 |
| October | 416 | 11 |
| November | 791 | 0 |
| December | 1,141 | 0 |
| Year (annual) | 6,433 | 781 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00004808. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Have recent years at Chicago Aurora Municipal Airport been warmer than normal?
2025 averaged 50.4°F, 1.0°F above the 1991-2020 normal of 49.4°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 50.1°F | +0.7°F | 23.60 |
| 2022 | 48.3°F | −1.1°F | 32.85 |
| 2023 | 50.6°F | +1.2°F | 33.81 |
| 2024 | 52.5°F | +3.1°F | 36.38 |
| 2025 | 50.4°F | +1.0°F | 27.63 |
Source: observed years: ACIS, station USW00004808. A year counts only with all twelve months complete.
How does Chicago Aurora Municipal Airport's climate compare?
Chicago Aurora Municipal Airport is warmer than 25 of the 144 places with their own NOAA record in Illinois, and wetter than 2. Across the 7,247 U.S. stations with normals, its annual mean of 49.4°F is warmer than 38%.
In the Köppen classification computed from these normals, Chicago Aurora Municipal Airport is Dfa: continental, no dry season, hot summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Chicago Aurora Municipal Airport share this climate record?
12 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Yorkville, IL25,986 people · 8 mi S
- Plano, IL12,677 people · 7 mi SW
- Sugar Grove, IL9,339 people · 2 mi E
- Sandwich, IL7,299 people · 11 mi SW
- Elburn, IL6,826 people · 8 mi N
- Lake Holiday, IL5,402 people · 14 mi SW
- Prestbury, IL2,174 people · 3 mi E
- Hinckley, IL1,976 people · 8 mi W
- Somonauk, IL1,761 people · 14 mi SW
- Big Rock, IL1,086 people · 2 mi W
- Kaneville, IL447 people · 5 mi NW
- Millbrook, IL282 people · 12 mi S
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Chicago Aurora Municipal Airport's climate
What is the coldest month at Chicago Aurora Municipal Airport?
January, with a normal high of 31°F and a normal low of 15°F. The warmest is July (84°F by day, 62°F at night).
Does it snow at Chicago Aurora Municipal Airport?
Yes. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Aurora (9 miles away), records 28 inches of snow in a normal year.
What is the rainiest month at Chicago Aurora Municipal Airport?
May, with 4.06 in of precipitation in a normal year; the driest is January with 1.30 in.
What plant hardiness zone is Chicago Aurora Municipal Airport in?
The USDA's 2023 map puts Chicago Aurora Municipal Airport in zone 5b in ZIP code 60554, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches −16°F (21 years, 1991-2020): zone 5a.
How late can frost come at Chicago Aurora Municipal Airport?
In half of years the last 32°F night comes after April 28; in one year in ten it comes after May 11. Waiting until May 11 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Illinois climateThe statewide normals and every place in the state
- Aurora, IL9 miles from this station, 50.2°F a year
- West Chicago, IL16 miles from this station, 49.7°F a year
- DeKalb, IL19 miles from this station, 48.6°F a year
- Shabbona, IL20 miles from this station, 47.8°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made