Average annual temperature is 12.5 °C
Absolute maximum temperature: 34.6 °C
Absolute minimum temperature: -13.2 °C
Number of sunny days: 173 days
Number of rainy days: 186 days
Number of snow days: 6 days
Look at detailed online map of Mertztown
* Weather data for Mertztown 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) | 17.9 | 17.9 | 17.5 | 30.7 | 30.8 | 34.6 | 32.9 | 31.3 | 33.5 | 27.6 | 20.2 | 15.4 |
| Average daytime temperature (°C) | 8.0 | 8.9 | 10.2 | 19.1 | 22.7 | 26.3 | 29.5 | 27.3 | 23.9 | 18.9 | 10.8 | 8.4 |
| Average temperature (°C) | 4.1 | 3.4 | 4.6 | 12.5 | 15.7 | 20.1 | 24.2 | 22.3 | 19.0 | 13.8 | 5.6 | 4.4 |
| Average night temperature (°C) | 0.9 | -1.0 | -0.1 | 7.0 | 8.8 | 14.6 | 19.6 | 17.9 | 15.0 | 9.4 | 1.6 | 1.1 |
| Absolute minimum temperature (°C) | -4.6 | -13.2 | -6.0 | -1.8 | 3.3 | 8.9 | 15.7 | 13.2 | 9.5 | 2.4 | -5.4 | -4.8 |
| 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) | 9.7 | 10.7 | 11.9 | 13.3 | 14.4 | 15.0 | 14.7 | 13.7 | 12.5 | 11.1 | 10.0 | 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) | 4.5 | 6.6 | 7.3 | 8.6 | 11.5 | 10.7 | 11.8 | 10.4 | 8.0 | 8.2 | 7.5 | 4.4 |
| Precipitation (mm) | 110 | 34 | 75 | 107 | 26 | 145 | 91 | 93 | 149 | 67 | 67 | 176 |
| Sunny days | 11 | 16 | 10 | 15 | 19 | 12 | 8 | 15 | 16 | 17 | 19 | 15 |
| Rainy days | 20 | 10 | 20 | 15 | 12 | 18 | 23 | 16 | 14 | 14 | 10 | 14 |
| Snow days | 0 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 |
The best time to visit Mertztown during the most sunny months:
The largest precipitation sum in Mertztown is at