The year at a glance
Averages from 30 years of climate history, 1991-2020
| Joliet | Metric | Rockford |
|---|---|---|
| 183 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 |
| 19 in | Snowfallper year | 36 in |
| 15 days | Hot daysabove 90 °F | 15 days |
| 125 days | Freezing nightsat or below 32 °F | 136 days |
| 71% | Humidityaverage relative | 71% |
| 51 °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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Joliet high | 31 | 36 | 47 | 60 | 71 | 80 | 84 | 82 | 76 | 63 | 49 | 37 |
| Rockford high | 29 | 33 | 46 | 59 | 71 | 80 | 84 | 82 | 75 | 62 | 47 | 34 |
| Joliet low | 17 | 20 | 29 | 39 | 50 | 60 | 64 | 63 | 55 | 43 | 32 | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Joliet | 2.2 | 2.0 | 2.7 | 4.4 | 4.6 | 4.3 | 3.6 | 3.5 | 2.9 | 3.2 | 2.7 | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Joliet | 11 | 11 | 14 | 13 | 15 | 16 | 20 | 20 | 20 | 17 | 14 | 12 |
| 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.
Joliet vs another city
- Joliet vs Shorewood, IL
- Joliet vs Crest Hill, IL
- Joliet vs Lockport, IL
- Joliet vs Romeoville, IL
- Joliet vs Minooka, IL
- Joliet vs Channahon, IL
- Joliet vs New York, NY
- Joliet vs Los Angeles, CA
- Joliet vs Chicago, IL
- Joliet vs Houston, TX
- Joliet vs Phoenix, AZ
- Joliet 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).