Average annual temperature is 14.1 °C
Absolute maximum temperature: 34.9 °C
Absolute minimum temperature: -7.9 °C
Number of sunny days: 177 days
Number of rainy days: 185 days
Number of snow days: 3 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) | 17.8 | 24.6 | 24.4 | 29.1 | 29.7 | 34.2 | 34.9 | 34.1 | 34.0 | 29.3 | 24.9 | 18.9 |
| Average daytime temperature (°C) | 10.1 | 14.1 | 14.0 | 20.4 | 23.9 | 27.9 | 30.8 | 29.6 | 27.0 | 20.7 | 14.1 | 11.2 |
| Average temperature (°C) | 5.0 | 7.0 | 7.2 | 13.4 | 17.3 | 21.5 | 24.6 | 23.5 | 20.7 | 15.0 | 7.9 | 5.9 |
| Average night temperature (°C) | 1.6 | 2.2 | 2.1 | 7.5 | 11.6 | 15.7 | 19.7 | 18.5 | 15.4 | 10.4 | 3.4 | 2.2 |
| Absolute minimum temperature (°C) | -6.7 | -7.9 | -7.7 | 0.1 | 4.4 | 10.8 | 15.9 | 13.0 | 11.0 | 1.8 | -6.4 | -5.1 |
| 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) | 9.8 | 10.8 | 12.0 | 13.2 | 14.3 | 14.8 | 14.6 | 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) | 4.6 | 7.4 | 7.7 | 9.6 | 10.0 | 11.3 | 11.9 | 10.7 | 9.8 | 7.5 | 7.3 | 5.4 |
| Precipitation (mm) | 90 | 73 | 83 | 56 | 58 | 61 | 87 | 126 | 32 | 61 | 39 | 79 |
| Sunny days | 10 | 15 | 16 | 17 | 15 | 15 | 7 | 15 | 15 | 15 | 21 | 16 |
| Rainy days | 20 | 12 | 14 | 13 | 16 | 15 | 24 | 16 | 15 | 16 | 9 | 15 |
| Snow days | 1 | 1 | 1 | 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