Average annual temperature is 12.2 °C
Absolute maximum temperature: 34.0 °C
Absolute minimum temperature: -12.3 °C
Number of sunny days: 165 days
Number of rainy days: 186 days
Number of snow days: 14 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) | 15.5 | 20.4 | 20.8 | 29.1 | 28.2 | 32.9 | 34.0 | 32.6 | 33.2 | 27.5 | 20.2 | 15.1 |
| Average daytime temperature (°C) | 6.8 | 9.5 | 10.0 | 19.0 | 21.3 | 25.5 | 29.8 | 28.2 | 23.8 | 18.3 | 10.4 | 7.8 |
| Average temperature (°C) | 3.3 | 3.6 | 4.3 | 12.4 | 14.8 | 19.4 | 23.9 | 22.2 | 18.5 | 13.3 | 5.5 | 4.1 |
| Average night temperature (°C) | 0.7 | -0.9 | -0.2 | 6.8 | 8.6 | 14.0 | 18.9 | 17.4 | 14.2 | 9.2 | 1.5 | 1.4 |
| Absolute minimum temperature (°C) | -4.5 | -12.3 | -7.3 | -0.9 | 2.2 | 8.7 | 16.0 | 13.7 | 9.1 | 1.0 | -6.9 | -4.1 |
| 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 | 15.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.7 | 10.7 | 11.9 | 13.3 | 14.4 | 15.0 | 14.7 | 13.7 | 12.5 | 11.1 | 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) | 4.4 | 6.8 | 7.1 | 9.3 | 11.0 | 10.7 | 12.2 | 10.8 | 8.8 | 7.4 | 7.6 | 4.1 |
| Precipitation (mm) | 81 | 52 | 68 | 86 | 32 | 85 | 99 | 61 | 92 | 73 | 58 | 89 |
| Sunny days | 10 | 14 | 12 | 15 | 21 | 11 | 5 | 9 | 17 | 18 | 20 | 13 |
| Rainy days | 18 | 11 | 16 | 15 | 10 | 19 | 26 | 22 | 13 | 13 | 8 | 15 |
| Snow days | 3 | 3 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 3 |
The best time to visit Waterloo during the most sunny months:
The largest precipitation sum in Waterloo is at