Evanston, Illinois climate: NOAA's gridded normals for the city, beside the nearest station records
NOAA's gridded 1991-2020 normals put Evanston's center at January lows of 19°F and July highs of 82°F, a yearly mean of 50.3°F and 37.8 inches of precipitation. No NOAA station keeps a record under the city's name. The nearest station record, Chicago Botanic Garden (8 miles NW, 630 ft), has January lows of 16°F and July highs of 84°F.
76,006 people (Census Bureau 2024). Distances and directions are from the city's center.
- Jan 32° 19°
- Feb 36° 22°
- Mar 46° 30°
- Apr 57° 39°
- May 68° 49°
- Jun 78° 59°
- Jul 82° 65°
- Aug 81° 64°
- Sep 74° 57°
- Oct 62° 45°
- Nov 48° 34°
- Dec 37° 24°
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 Evanston's center.
What is each month like in Evanston?
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 Botanic Garden high | Chicago Botanic Garden low |
|---|---|---|---|---|---|---|
| January | 32°F | 19°F | 25.4°F | 2.01 | 32°F | 16°F |
| February | 36°F | 22°F | 28.6°F | 1.88 | 36°F | 19°F |
| March | 46°F | 30°F | 37.8°F | 2.26 | 46°F | 28°F |
| April | 57°F | 39°F | 47.7°F | 3.72 | 57°F | 38°F |
| May | 68°F | 49°F | 58.2°F | 4.52 | 68°F | 48°F |
| June | 78°F | 59°F | 68.2°F | 4.41 | 78°F | 57°F |
| July | 82°F | 65°F | 73.8°F | 3.79 | 84°F | 63°F |
| August | 81°F | 64°F | 72.6°F | 3.73 | 82°F | 62°F |
| September | 74°F | 57°F | 65.7°F | 3.38 | 75°F | 55°F |
| October | 62°F | 45°F | 53.5°F | 3.38 | 63°F | 43°F |
| November | 48°F | 34°F | 41.2°F | 2.54 | 49°F | 33°F |
| December | 37°F | 24°F | 30.8°F | 2.16 | 38°F | 22°F |
In metric: a yearly mean of 10.2°C, January lows of −7°C, July highs of 28°C and 960 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 Evanston 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 Botanic Garden | 8 mi NW | 630 ft | 49.6°F | 16°F | 84°F | 39.5 | 34 | April 26 |
| WheelingChicago Palwaukee Airport | 12 mi NW | 636 ft | 50.8°F | 18°F | 84°F | 32.3 | – | April 19 |
| ChicagoChicago O'Hare International Airport | 13 mi W | 658 ft | 51.2°F | 19°F | 85°F | 37.9 | 38 | April 16 |
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 Evanston?
NOAA's grid gives no snow, frost dates or records, so these come from the nearest station record, Chicago Botanic Garden (8 miles NW, 630 ft). It gets 34 inches of snow in a normal year. The last spring frost (32°F) comes after April 26 in half of years and the first autumn frost before October 21. Its record high is 105°F (1995) and its record low −27°F (1982) (kept since 1981).
The USDA's 2023 Plant Hardiness Zone Map puts Evanston in zone 6a across its 3 ZIP code areas.
Over a year 70% of the sunlight that would reach the ground under clear skies gets through the clouds in the area (3.7 kWh per square metre a day, NASA POWER 2001-2020); July is the sunniest month (79%) and January the cloudiest (53%).
Chicago Botanic Garden'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 Evanston; the nearest record's month pages have them.
Source: NOAA NCEI 1991-2020 normals, station USC00111497; 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 Evanston, ZIP code by ZIP code?
3 ZIP code areas lie wholly or partly in Evanston. On NOAA's grid 60202 is the warmest (50.4°F a year) and 60208 the coolest (50.3°F), so the city is nearly uniform. 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 |
|---|---|---|---|---|---|---|---|---|
| 60201 | 6a | 50.3°F | 19°F | 82°F | 37.8 | Chicago Botanic Garden (8 mi) | April 26 | October 21 |
| 60202 | 6a | 50.4°F | 19°F | 83°F | 37.8 | Chicago Botanic Garden (9 mi) | April 26 | October 21 |
| 60208 | 6a | 50.3°F | 19°F | 82°F | 37.8 | Chicago Botanic Garden (8 mi) | April 26 | October 21 |
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.