Average annual temperature is 12.5 °C
Absolute maximum temperature: 32.9 °C
Absolute minimum temperature: -9.7 °C
Number of sunny days: 167 days
Number of rainy days: 190 days
Number of snow days: 8 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) | 16.7 | 21.4 | 22.3 | 26.4 | 29.0 | 32.9 | 32.1 | 32.1 | 32.6 | 28.1 | 20.7 | 15.9 |
| Average daytime temperature (°C) | 7.2 | 11.4 | 11.4 | 17.7 | 22.0 | 25.8 | 28.8 | 27.8 | 25.0 | 18.5 | 11.7 | 8.8 |
| Average temperature (°C) | 3.1 | 4.5 | 5.1 | 11.5 | 15.8 | 20.1 | 23.4 | 22.1 | 19.4 | 13.7 | 6.1 | 4.7 |
| Average night temperature (°C) | 0.0 | -0.2 | 0.4 | 5.8 | 10.3 | 14.7 | 18.7 | 17.1 | 14.5 | 9.6 | 1.9 | 1.8 |
| Absolute minimum temperature (°C) | -7.5 | -9.7 | -7.6 | -1.3 | 2.6 | 9.1 | 14.2 | 11.4 | 8.9 | -0.3 | -7.1 | -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) | 9.7 | 10.7 | 12.0 | 13.3 | 14.4 | 14.9 | 14.7 | 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) | 3.6 | 7.1 | 7.4 | 9.2 | 10.2 | 10.3 | 11.9 | 10.9 | 9.4 | 7.3 | 7.1 | 5.1 |
| Precipitation (mm) | 136 | 66 | 124 | 93 | 98 | 110 | 76 | 115 | 49 | 116 | 52 | 63 |
| Sunny days | 7 | 16 | 15 | 12 | 18 | 13 | 6 | 15 | 18 | 13 | 22 | 12 |
| Rainy days | 20 | 12 | 13 | 18 | 13 | 17 | 25 | 16 | 12 | 18 | 8 | 18 |
| Snow days | 4 | 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