Average annual temperature is 14.2 °C
Absolute maximum temperature: 37.8 °C
Absolute minimum temperature: -11.8 °C
Number of sunny days: 202 days
Number of rainy days: 160 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) | 15.5 | 18.3 | 23.5 | 28.1 | 32.8 | 37.7 | 37.1 | 37.8 | 35.2 | 31.3 | 24.0 | 16.1 |
| Average daytime temperature (°C) | 7.0 | 10.6 | 11.5 | 20.4 | 26.8 | 30.5 | 31.2 | 30.6 | 28.1 | 20.4 | 13.5 | 9.4 |
| Average temperature (°C) | 1.7 | 3.4 | 5.9 | 13.3 | 20.0 | 24.2 | 25.5 | 25.2 | 21.9 | 15.1 | 7.8 | 5.2 |
| Average night temperature (°C) | -2.0 | -1.7 | 1.7 | 7.4 | 13.8 | 18.6 | 20.9 | 21.0 | 16.9 | 10.9 | 3.4 | 2.2 |
| Absolute minimum temperature (°C) | -11.8 | -11.8 | -8.5 | -0.5 | 4.6 | 12.7 | 15.3 | 14.8 | 12.2 | -2.3 | -6.2 | -4.6 |
| 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 | 10.7 | 12.0 | 13.2 | 14.3 | 14.9 | 14.6 | 13.7 | 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) | 6.0 | 7.7 | 7.0 | 10.4 | 10.8 | 12.5 | 11.1 | 10.9 | 10.5 | 7.7 | 7.1 | 4.9 |
| Precipitation (mm) | 65 | 118 | 101 | 57 | 72 | 86 | 117 | 93 | 47 | 92 | 21 | 116 |
| Sunny days | 18 | 17 | 14 | 21 | 17 | 14 | 12 | 16 | 22 | 15 | 21 | 15 |
| Rainy days | 10 | 11 | 17 | 9 | 14 | 16 | 19 | 15 | 8 | 16 | 9 | 16 |
| Snow days | 3 | 0 | 0 | 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