United States
Weather in Waterloo through the year
The average of the weather stations Cedar Rapids (79 km) and Rock Is L&D (183 km); nearer ones count more.
| Month | Average high | Coolest to warmest day |
|---|---|---|
| January | -0.9 °C | -1.5 °C – -0.1 °C |
| February | 2.0 °C | -0.2 °C – 5.2 °C |
| March | 9.7 °C | 5.8 °C – 13.2 °C |
| April | 17.0 °C | 13.6 °C – 20.1 °C |
| May | 23.2 °C | 20.2 °C – 26.3 °C |
| June | 28.4 °C | 26.5 °C – 29.5 °C |
| July | 29.9 °C | 29.6 °C – 30.1 °C |
| August | 28.7 °C | 28.1 °C – 29.6 °C |
| September | 25.6 °C | 22.8 °C – 27.9 °C |
| October | 18.2 °C | 13.7 °C – 22.6 °C |
| November | 9.1 °C | 5.0 °C – 13.4 °C |
| December | 1.9 °C | -0.1 °C – 4.6 °C |