Berwyn, Illinois climate: NOAA's gridded normals for the city, beside the nearest station records
NOAA's gridded 1991-2020 normals put Berwyn's center at January lows of 18°F and July highs of 84°F, a yearly mean of 50.5°F and 37.9 inches of precipitation. No NOAA station keeps a record under the city's name. The nearest station record, Chicago Midway Airport (4 miles SE, 612 ft), has January lows of 19°F and July highs of 85°F.
55,152 people (Census Bureau 2024). Distances and directions are from the city's center.
- Jan 32° 18°
- Feb 36° 21°
- Mar 47° 29°
- Apr 59° 39°
- May 70° 49°
- Jun 80° 59°
- Jul 84° 65°
- Aug 82° 63°
- Sep 76° 56°
- Oct 63° 44°
- Nov 49° 33°
- Dec 37° 23°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
The months above are NOAA's gridded normals at Berwyn's center.
What is each month like in Berwyn?
NOAA's grid estimates the normals every 5 km or so from the stations around each point, terrain included. It smooths between stations, so night lows at the heart of a large city can run warmer than the grid shows: at five big-city airports we compared, the grid's highs were within about 1°F of the station and its lows 1-6°F cooler. The nearest record's high and low are beside each month.
| Month | High | Low | Mean | Precip. | Chicago Midway Airport high | Chicago Midway Airport low |
|---|---|---|---|---|---|---|
| January | 32°F | 18°F | 24.7°F | 2.00 | 33°F | 19°F |
| February | 36°F | 21°F | 28.3°F | 1.81 | 37°F | 23°F |
| March | 47°F | 29°F | 38.2°F | 2.32 | 48°F | 32°F |
| April | 59°F | 39°F | 48.9°F | 3.81 | 60°F | 41°F |
| May | 70°F | 49°F | 59.9°F | 4.54 | 71°F | 52°F |
| June | 80°F | 59°F | 69.6°F | 4.31 | 81°F | 62°F |
| July | 84°F | 65°F | 74.4°F | 3.72 | 85°F | 68°F |
| August | 82°F | 63°F | 72.7°F | 4.03 | 83°F | 66°F |
| September | 76°F | 56°F | 65.5°F | 3.29 | 76°F | 59°F |
| October | 63°F | 44°F | 53.3°F | 3.47 | 63°F | 47°F |
| November | 49°F | 33°F | 40.7°F | 2.52 | 49°F | 35°F |
| December | 37°F | 23°F | 30.1°F | 2.10 | 38°F | 25°F |
In metric: a yearly mean of 10.3°C, January lows of −8°C, July highs of 29°C and 963 mm of precipitation a year.
Source: NOAA NCEI U.S. Monthly Gridded Climate Normals 1991-2020 (nClimGrid, accession 0245564); NOAA NCEI 1991-2020 station normals. The grid cell holding the city's Census center point.
What do the station records around Berwyn say?
Each row is a NOAA station's own 1991-2020 normals, with the snow and frost dates the grid does not give. A record downhill or nearer the coast than the city can run warmer, one uphill cooler: compare the elevations.
| Record | Where | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Chicago Midway Airport | 4 mi SE | 612 ft | 52.1°F | 19°F | 85°F | 34.4 | – | April 11 |
| BurbankChicago Midway Airport (3 mi SW) | 7 mi S | 620 ft | 52.4°F | 20°F | 85°F | 40.9 | 39 | April 10 |
| Little Red School House | 10 mi SW | 715 ft | 51.4°F | 15°F | 90°F | 41.4 | – | April 19 |
Source: NOAA NCEI 1991-2020 U.S. Climate Normals; place center and population: Census Bureau 2024. Last frost: the median last spring date of 32°F.
How much snow, how late a frost, what zone and how much sun in Berwyn?
NOAA's grid gives no snow, frost dates or records, so these come from the nearest station record, Chicago Midway Airport (4 miles SE, 612 ft). NOAA publishes no snowfall normal for it; the nearest record that has one, Burbank (7 miles S), gets 39 inches a year. The last spring frost (32°F) comes after April 11 in half of years and the first autumn frost before October 31. Its record high is 107°F (1934) and its record low −22°F (2019) (kept since 1928).
The USDA's 2023 Plant Hardiness Zone Map puts Berwyn in zone 6a (ZIP code 60402).
Over a year 72% of the sunlight that would reach the ground under clear skies gets through the clouds in the area (3.8 kWh per square metre a day, NASA POWER 2001-2020); July is the sunniest month (80%) and January the cloudiest (59%).
Chicago Midway Airport's page has its months, frost probabilities, records by month and recent years. NOAA's grid has monthly figures only, so there are no day-by-day month pages for Berwyn; the nearest record's month pages have them.
Source: NOAA NCEI 1991-2020 normals, station USW00014819; records: ACIS; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; sunshine: NASA POWER.
How does the climate vary across Berwyn, ZIP code by ZIP code?
One ZIP code area lies wholly or partly in Berwyn. Each row also names the nearest station record and its frost dates.
| ZIP code | Zone | Year | Jan low | Jul high | Precip. | Nearest record | Last frost | First frost |
|---|---|---|---|---|---|---|---|---|
| 60402 | 6a | 50.6°F | 18°F | 84°F | 37.8 | Chicago Midway Airport (4 mi) | April 11 | October 31 |
Source: Census Bureau 2020 ZCTA-to-place relationship file and ZCTA centers; NOAA NCEI gridded and station normals, 1991-2020. A ZIP area counts when at least a tenth of its land (and 0.5 km²) is in the city; its figures are the grid cell at its center; frost dates are the nearest record's medians of 32°F.