The year at a glance
Averages from 30 years of climate history, 1991-2020
| Posen | Metric | Riverdale |
|---|---|---|
| 180 days | Sunny daysclear or partly cloudy skies | 180 days |
| 39 in | Precipitationper year | 39 in |
| 132 days | Wet daysrain or snow per year | 132 days |
| 35 in | Snowfallper year | 34 in |
| 18 days | Hot daysabove 90 °F | 19 days |
| 114 days | Freezing nightsat or below 32 °F | 114 days |
| 71% | Humidityaverage relative | 71% |
| 52 °F | Average temperatureyear round | 52 °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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Posen high | 32 | 36 | 47 | 60 | 71 | 81 | 85 | 83 | 76 | 63 | 49 | 37 |
| Riverdale high | 32 | 36 | 47 | 60 | 71 | 81 | 85 | 83 | 76 | 63 | 49 | 37 |
| Posen low | 18 | 21 | 31 | 40 | 51 | 61 | 67 | 65 | 57 | 45 | 34 | 24 |
| Riverdale low | 18 | 21 | 31 | 40 | 51 | 61 | 67 | 65 | 58 | 45 | 34 | 24 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Posen | 2.4 | 2.1 | 2.8 | 4.5 | 4.4 | 4.0 | 3.6 | 3.8 | 3.0 | 3.3 | 2.8 | 2.4 |
| Riverdale | 2.4 | 2.1 | 2.8 | 4.5 | 4.4 | 4.0 | 3.6 | 3.8 | 3.0 | 3.3 | 2.8 | 2.4 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Posen | 10 | 11 | 14 | 13 | 15 | 16 | 20 | 20 | 20 | 16 | 14 | 11 |
| Riverdale | 10 | 11 | 14 | 13 | 15 | 16 | 20 | 20 | 20 | 16 | 14 | 11 |
Keep comparing
Nearby cities and popular picks for each side of this matchup. Any two cities can be compared from the home page.
Posen vs another city
- Posen vs Blue Island, IL
- Posen vs Midlothian, IL
- Posen vs Markham, IL
- Posen vs Harvey, IL
- Posen vs Calumet Park, IL
- Posen vs New York, NY
- Posen vs Los Angeles, CA
- Posen vs Chicago, IL
- Posen vs Houston, TX
- Posen vs Phoenix, AZ
- Posen vs Philadelphia, PA
Riverdale vs another city
- Riverdale vs Calumet Park, IL
- Riverdale vs Dolton, IL
- Riverdale vs Blue Island, IL
- Riverdale vs Harvey, IL
- Riverdale vs South Holland, IL
- Riverdale vs New York, NY
- Riverdale vs Los Angeles, CA
- Riverdale vs Chicago, IL
- Riverdale vs Houston, TX
- Riverdale vs Phoenix, AZ
- Riverdale 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).