Average annual temperature is 12.8 °C
Absolute maximum temperature: 34.2 °C
Absolute minimum temperature: -10.2 °C
Number of sunny days: 178 days
Number of rainy days: 178 days
Number of snow days: 9 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) | 17.2 | 20.5 | 22.1 | 27.0 | 29.2 | 33.0 | 34.2 | 33.5 | 31.5 | 29.2 | 24.6 | 16.2 |
| Average daytime temperature (°C) | 6.4 | 10.4 | 11.4 | 18.1 | 23.2 | 27.6 | 29.5 | 28.0 | 25.4 | 19.3 | 12.4 | 8.7 |
| Average temperature (°C) | 2.7 | 4.2 | 5.3 | 11.2 | 17.0 | 21.4 | 23.9 | 22.7 | 19.9 | 14.0 | 6.8 | 4.5 |
| Average night temperature (°C) | -0.2 | -0.2 | 0.8 | 5.4 | 11.0 | 15.9 | 19.1 | 18.1 | 15.0 | 9.8 | 2.7 | 1.4 |
| Absolute minimum temperature (°C) | -9.9 | -10.2 | -7.9 | -3.0 | 3.9 | 10.3 | 15.3 | 12.4 | 10.9 | -3.4 | -8.5 | -7.1 |
| 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) | 9.7 | 10.7 | 12.0 | 13.3 | 14.4 | 14.9 | 14.6 | 13.7 | 12.5 | 11.2 | 10.0 | 9.4 |
| 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) | 3.9 | 7.2 | 6.7 | 8.8 | 10.4 | 11.0 | 11.9 | 11.0 | 10.0 | 7.4 | 7.9 | 4.6 |
| Precipitation (mm) | 150 | 67 | 206 | 85 | 59 | 51 | 94 | 82 | 38 | 83 | 27 | 57 |
| Sunny days | 7 | 16 | 14 | 15 | 19 | 15 | 6 | 16 | 18 | 17 | 23 | 12 |
| Rainy days | 19 | 12 | 15 | 15 | 12 | 15 | 25 | 15 | 12 | 14 | 7 | 17 |
| Snow days | 5 | 0 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 |
The best time to visit Waterloo during the most sunny months:
The largest precipitation sum in Waterloo is at