IL
Naperville and Rockford have remarkably similar climates.
The year at a glance
Averages from 30 years of climate history, 1991-2020
| Naperville | Metric | Rockford |
|---|---|---|
| 182 days | Sunny daysclear or partly cloudy skies | 183 days |
| 38 in | Precipitationper year | 36 in |
| 125 days | Wet daysrain or snow per year | 123 days |
| 29 in | Snowfallper year | 36 in |
| 21 days | Hot daysabove 90 °F | 15 days |
| 134 days | Freezing nightsat or below 32 °F | 136 days |
| 71% | Humidityaverage relative | 71% |
| 50 °F | Average temperatureyear round | 49 °F |
Monthly temperatures
Average daily high and low for each month, in °F. The gap between the two lines is what an ordinary day feels like across the year.
Daily highs
Daily lows
View monthly temperatures as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Naperville high | 32 | 36 | 48 | 61 | 72 | 82 | 85 | 83 | 77 | 64 | 49 | 37 |
| Rockford high | 29 | 33 | 46 | 59 | 71 | 80 | 84 | 82 | 75 | 62 | 47 | 34 |
| Naperville low | 16 | 19 | 28 | 38 | 49 | 59 | 63 | 62 | 54 | 42 | 31 | 22 |
| Rockford low | 14 | 17 | 28 | 38 | 49 | 59 | 63 | 62 | 53 | 42 | 30 | 20 |
Monthly precipitation
Total rain plus melted snow for each month, in inches. Taller bars mean wetter months.
View monthly precipitation as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Naperville | 2.1 | 2.0 | 2.7 | 4.4 | 4.6 | 4.3 | 3.7 | 3.6 | 3.0 | 3.1 | 2.5 | 2.2 |
| Rockford | 1.9 | 1.8 | 2.5 | 4.2 | 4.4 | 4.0 | 3.4 | 3.4 | 3.3 | 2.9 | 2.4 | 2.1 |
Monthly sunny days
Days each month with clear or partly cloudy skies, so compare the same month between cities.
View monthly sunny days as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Naperville | 11 | 11 | 14 | 13 | 15 | 16 | 20 | 20 | 20 | 17 | 14 | 11 |
| Rockford | 11 | 12 | 14 | 14 | 15 | 16 | 20 | 20 | 20 | 16 | 14 | 12 |
Keep comparing
Nearby cities and popular picks for each side of this matchup. Any two cities can be compared from the home page.
Naperville vs another city
- Naperville vs Lisle, IL
- Naperville vs Warrenville, IL
- Naperville vs Bolingbrook, IL
- Naperville vs Woodridge, IL
- Naperville vs Aurora, IL
- Naperville vs Downers Grove, IL
- Naperville vs New York, NY
- Naperville vs Los Angeles, CA
- Naperville vs Chicago, IL
- Naperville vs Houston, TX
- Naperville vs Phoenix, AZ
- Naperville vs Philadelphia, PA
Rockford vs another city
- Rockford vs Loves Park, IL
- Rockford vs Machesney Park, IL
- Rockford vs Belvidere, IL
- Rockford vs Candlewick Lake, IL
- Rockford vs Roscoe, IL
- Rockford vs Rockton, IL
- Rockford vs New York, NY
- Rockford vs Los Angeles, CA
- Rockford vs Chicago, IL
- Rockford vs Houston, TX
- Rockford vs Phoenix, AZ
- Rockford vs Philadelphia, PA
About this data
Every figure on this page is a 30 year average computed from daily climate history for 1991-2020, using each city's own coordinates. Wet days count days with measurable precipitation, calibrated against the wet day counts in NOAA's published climate normals. Sunny days count clear plus partly cloudy days, defined as average cloud cover of 63 percent or less and calibrated against NOAA's published sky cover tables. Snowfall figures are model estimates anchored to NOAA station measurements near each city.
Weather data by Open-Meteo.com (CC BY 4.0). Contains modified Copernicus Climate Change Service information (ERA5, ERA5-Land).