Rainy days · Illinois and Iowa
How often does it rain in Quad Cities?
The Quad Cities split their rain four ways and still somehow get plenty each.
Quad Cities gets measurable rain or snow on about 117 days a year, adding up to about 38 inches.
November usually brings Quad Cities about 9 wet days and 2.3 inches. The wettest month is usually May, with about 12 wet days, and the driest is September, with about 8 wet days. That makes Quad Cities number 62 of the 129 US cities we track, rainiest first.
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Rainy days, month by month
| Month | Wet days | Inches |
|---|---|---|
| January | 9 | 1.7 |
| February | 9 | 1.8 |
| March | 10 | 2.6 |
| April | 11 | 3.8 |
| May | 12 | 4.7 |
| June | 11 | 5.0 |
| July | 9 | 4.2 |
| August | 9 | 4.0 |
| September | 8 | 3.3 |
| October | 9 | 2.8 |
| November | 9 | 2.3 |
| December | 10 | 2.0 |
Cities with about as many rainy days
- Mobile, Alabama: about 117 wet days a year
- Peoria, Illinois: about 117 wet days a year
- Atlanta, Georgia: about 116 wet days a year
Source: NOAA daily precipitation records for the Quad Cities area, 1991 to 2020 (at least 30 complete years behind every month), via the Applied Climate Information System. A wet day here means at least a hundredth of an inch of rain or melted snow.