Average annual temperature is 13.0 °C
Absolute maximum temperature: 35.4 °C
Absolute minimum temperature: -11.7 °C
Number of sunny days: 183 days
Number of rainy days: 177 days
Number of snow days: 5 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) | 15.2 | 20.9 | 23.0 | 29.3 | 28.4 | 33.8 | 35.4 | 32.2 | 34.1 | 27.4 | 21.9 | 16.1 |
| Average daytime temperature (°C) | 7.8 | 10.1 | 11.0 | 20.3 | 22.0 | 26.4 | 31.0 | 28.9 | 24.9 | 19.2 | 11.5 | 8.6 |
| Average temperature (°C) | 4.1 | 4.6 | 5.3 | 13.5 | 15.7 | 20.3 | 24.7 | 23.1 | 19.6 | 14.1 | 6.3 | 4.5 |
| Average night temperature (°C) | 1.3 | 0.3 | 0.7 | 8.1 | 10.0 | 15.1 | 19.8 | 18.4 | 15.3 | 10.0 | 2.1 | 1.5 |
| Absolute minimum temperature (°C) | -4.1 | -11.7 | -7.1 | 0.8 | 4.0 | 11.0 | 16.5 | 13.0 | 10.2 | 2.3 | -6.8 | -4.9 |
| 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) | 5.1 | 7.0 | 7.6 | 9.5 | 10.7 | 11.0 | 12.1 | 11.0 | 8.9 | 8.2 | 7.8 | 5.0 |
| Precipitation (mm) | 62 | 54 | 100 | 126 | 36 | 137 | 87 | 73 | 109 | 40 | 70 | 115 |
| Sunny days | 13 | 16 | 14 | 18 | 16 | 14 | 3 | 12 | 16 | 18 | 24 | 19 |
| Rainy days | 17 | 10 | 16 | 12 | 15 | 16 | 28 | 19 | 14 | 13 | 6 | 11 |
| Snow days | 1 | 2 | 1 | 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