Average annual temperature is 14.0 °C
Absolute maximum temperature: 34.2 °C
Absolute minimum temperature: -7.2 °C
Number of sunny days: 182 days
Number of rainy days: 176 days
Number of snow days: 7 days
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) | 16.8 | 22.6 | 24.1 | 28.0 | 32.0 | 33.7 | 34.2 | 34.2 | 34.1 | 30.6 | 25.6 | 15.7 |
| Average daytime temperature (°C) | 8.5 | 13.1 | 13.2 | 19.4 | 24.1 | 28.1 | 30.4 | 29.5 | 27.3 | 20.7 | 13.8 | 9.9 |
| Average temperature (°C) | 4.5 | 6.3 | 6.9 | 12.7 | 17.7 | 21.9 | 24.8 | 23.8 | 21.1 | 15.1 | 8.0 | 5.3 |
| Average night temperature (°C) | 1.5 | 1.7 | 2.3 | 7.2 | 12.0 | 16.8 | 20.3 | 19.0 | 16.0 | 10.8 | 4.0 | 1.9 |
| Absolute minimum temperature (°C) | -5.3 | -7.2 | -6.2 | 0.6 | 3.2 | 11.6 | 16.3 | 13.6 | 11.2 | -0.2 | -6.5 | -5.3 |
| 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 | 10.7 | 12.0 | 13.2 | 14.3 | 14.9 | 14.6 | 13.7 | 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) | 4.2 | 7.8 | 7.3 | 9.4 | 10.3 | 11.0 | 11.7 | 11.4 | 10.4 | 7.7 | 7.8 | 4.9 |
| Precipitation (mm) | 120 | 44 | 141 | 80 | 59 | 79 | 83 | 149 | 28 | 77 | 37 | 63 |
| Sunny days | 6 | 16 | 14 | 14 | 19 | 15 | 10 | 15 | 17 | 18 | 24 | 14 |
| Rainy days | 22 | 12 | 14 | 16 | 12 | 15 | 21 | 16 | 13 | 13 | 6 | 16 |
| Snow days | 3 | 0 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
The best time to visit Waterloo during the most sunny months:
The largest precipitation sum in Waterloo is at