Average annual temperature is 12.1 °C
Absolute maximum temperature: 37.7 °C
Absolute minimum temperature: -18.5 °C
Number of sunny days: 218 days
Number of rainy days: 129 days
Number of snow days: 18 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) | 9.1 | 13.8 | 22.6 | 29.5 | 30.8 | 33.5 | 35.8 | 37.7 | 35.0 | 32.9 | 19.8 | 14.6 |
| Average daytime temperature (°C) | 1.6 | 6.0 | 8.9 | 18.8 | 25.4 | 29.9 | 29.3 | 29.9 | 28.2 | 19.0 | 12.3 | 6.4 |
| Average temperature (°C) | -2.8 | -0.9 | 2.2 | 11.5 | 19.0 | 24.0 | 23.9 | 24.5 | 22.0 | 13.6 | 6.2 | 1.7 |
| Average night temperature (°C) | -6.1 | -5.6 | -2.4 | 5.7 | 13.1 | 18.2 | 19.1 | 19.9 | 16.8 | 9.1 | 1.4 | -1.9 |
| Absolute minimum temperature (°C) | -18.5 | -17.1 | -11.0 | -4.1 | 3.3 | 10.3 | 12.4 | 13.0 | 10.6 | -5.4 | -7.3 | -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 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.6 | 10.6 | 11.9 | 13.3 | 14.5 | 15.1 | 14.8 | 13.8 | 12.5 | 11.1 | 9.9 | 9.3 |
| 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) | 4.9 | 7.5 | 8.3 | 9.9 | 11.6 | 13.1 | 11.6 | 11.2 | 10.2 | 7.9 | 7.1 | 5.2 |
| Precipitation (mm) | 43 | 33 | 38 | 34 | 63 | 76 | 112 | 76 | 40 | 58 | 11 | 45 |
| Sunny days | 18 | 19 | 21 | 21 | 16 | 12 | 11 | 18 | 21 | 15 | 24 | 22 |
| Rainy days | 6 | 6 | 9 | 8 | 15 | 18 | 20 | 13 | 9 | 15 | 4 | 6 |
| Snow days | 7 | 3 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 2 | 3 |
The best time to visit Waterloo during the most sunny months:
The largest precipitation sum in Waterloo is at