Weather Forecast, Williamsport

Quick Pick
| Month | Mean Temp °C | Mean Min Temp °C | Mean Max Temp °C | Mean Monthly Prec Days | Mean Monthly Days with Thunder | Mean Monthly Sleet/Snow Days |
| January | -6.5 °C | -11.1 °C | -2.0 °C | n/a | n/a | n/a |
| February | -5.7 °C | -10.8 °C | -.7 °C | n/a | n/a | n/a |
| March | -.4 °C | -5.8 °C | 4.8 °C | n/a | n/a | n/a |
| April | 5.9 °C | .2 °C | 11.7 °C | n/a | n/a | n/a |
| May | 11.8 °C | 5.7 °C | 17.9 °C | n/a | n/a | n/a |
| June | 16.4 °C | 10.4 °C | 22.4 °C | n/a | n/a | n/a |
| July | 19.0 °C | 13.1 °C | 24.9 °C | n/a | n/a | n/a |
| August | 18.1 °C | 12.2 °C | 24.1 °C | n/a | n/a | n/a |
| September | 14.2 °C | 8.3 °C | 20.2 °C | n/a | n/a | n/a |
| October | 8.6 °C | 3.0 °C | 14.2 °C | n/a | n/a | n/a |
| November | 2.9 °C | -1.6 °C | 7.4 °C | n/a | n/a | n/a |
| December | -3.6 °C | -7.7 °C | .5 °C | n/a | n/a | n/a |
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