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Weather in Johnstown
Average Weather
| Month | Average monthly max temperature | Average monthly min temperature |
| January | 0°C | -7°C |
| February | 2°C | -6°C |
| March | 7°C | -1°C |
| April | 13°C | 3°C |
| May | 19°C | 9°C |
| June | 24°C | 13°C |
| July | 26°C | 16°C |
| August | 25°C | 15°C |
| September | 22°C | 12°C |
| October | 15°C | 6°C |
| November | 8°C | 0°C |
| December | 3°C | -3°C |
14 day forecast
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