Average annual temperature is 15.2 °C
Absolute maximum temperature: 37.2 °C
Absolute minimum temperature: -7.8 °C
Number of sunny days: 183 days
Number of rainy days: 181 days
Number of snow days: 1 day
Look at detailed online map of Johnstown
* Weather data for Johnstown 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) | 18.6 | 23.3 | 23.5 | 28.8 | 26.5 | 29.7 | 37.2 | 34.3 | 34.4 | 28.2 | 25.9 | 17.1 |
| Average daytime temperature (°C) | 10.8 | 12.0 | 13.3 | 20.6 | 21.0 | 26.0 | 30.7 | 29.6 | 26.0 | 21.5 | 14.1 | 11.2 |
| Average temperature (°C) | 6.9 | 7.5 | 8.2 | 15.3 | 16.7 | 21.3 | 25.9 | 25.0 | 22.0 | 16.4 | 9.3 | 7.0 |
| Average night temperature (°C) | 4.0 | 3.7 | 4.2 | 11.2 | 13.1 | 17.4 | 22.2 | 21.3 | 18.4 | 12.4 | 5.8 | 3.8 |
| Absolute minimum temperature (°C) | -1.2 | -7.8 | -2.3 | 4.1 | 6.8 | 13.5 | 19.9 | 17.9 | 14.2 | 6.8 | -4.7 | -2.3 |
| 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 | 14.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.8 | 10.8 | 12.0 | 13.2 | 14.3 | 14.8 | 14.5 | 13.6 | 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) | 5.3 | 7.1 | 7.7 | 9.4 | 10.5 | 11.2 | 11.5 | 10.8 | 8.6 | 8.6 | 7.8 | 5.7 |
| Precipitation (mm) | 65 | 65 | 54 | 139 | 62 | 127 | 114 | 48 | 120 | 29 | 71 | 151 |
| Sunny days | 16 | 16 | 15 | 15 | 15 | 11 | 6 | 11 | 16 | 22 | 22 | 18 |
| Rainy days | 15 | 12 | 16 | 15 | 16 | 19 | 25 | 20 | 14 | 9 | 7 | 13 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 |
The best time to visit Johnstown during the most sunny months:
The largest precipitation sum in Johnstown is at