Average annual temperature is 14.6 °C
Absolute maximum temperature: 37.7 °C
Absolute minimum temperature: -11.7 °C
Number of sunny days: 197 days
Number of rainy days: 167 days
Number of snow days: 1 day
Look at detailed online map of Waterloo
* Weather data for Waterloo United States is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 19.4 | 21.0 | 22.9 | 27.9 | 32.1 | 35.1 | 36.7 | 37.7 | 32.7 | 29.2 | 26.4 | 17.5 |
| Average daytime temperature (°C) | 8.2 | 11.3 | 13.0 | 20.7 | 25.8 | 30.2 | 31.6 | 29.9 | 27.1 | 20.5 | 14.2 | 10.1 |
| Average temperature (°C) | 3.6 | 5.4 | 6.9 | 13.7 | 19.5 | 23.7 | 25.7 | 24.7 | 21.4 | 15.2 | 8.6 | 5.6 |
| Average night temperature (°C) | 0.3 | 1.0 | 2.4 | 8.1 | 14.0 | 18.0 | 21.1 | 20.5 | 16.7 | 11.0 | 4.3 | 2.5 |
| Absolute minimum temperature (°C) | -11.7 | -10.3 | -7.0 | 1.1 | 6.1 | 12.5 | 17.5 | 14.0 | 11.6 | -2.2 | -5.0 | -6.2 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.8 | 10.8 | 12.0 | 13.2 | 14.3 | 14.8 | 14.5 | 13.6 | 12.4 | 11.2 | 10.1 | 9.5 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 5.3 | 7.2 | 7.0 | 10.4 | 10.7 | 12.5 | 11.6 | 10.1 | 10.4 | 7.7 | 7.7 | 6.1 |
| Precipitation (mm) | 71 | 40 | 211 | 63 | 158 | 66 | 153 | 134 | 44 | 51 | 25 | 89 |
| Sunny days | 17 | 17 | 13 | 19 | 16 | 17 | 7 | 16 | 18 | 17 | 23 | 17 |
| Rainy days | 13 | 11 | 18 | 11 | 15 | 13 | 24 | 15 | 12 | 14 | 7 | 14 |
| Snow days | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Waterloo during the most sunny months:
The largest precipitation sum in Waterloo is at