Average annual temperature is 8.8 °C
Absolute maximum temperature: 28.4 °C
Absolute minimum temperature: -13.7 °C
Number of sunny days: 168 days
Number of rainy days: 158 days
Number of snow days: 39 days
Look at detailed online map of Williamsport
* Weather data for Williamsport 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) | 5.0 | 8.4 | 9.4 | 21.9 | 27.7 | 28.4 | 25.1 | 24.8 | 26.2 | 22.0 | 12.9 | 9.5 |
| Average daytime temperature (°C) | 0.7 | 0.8 | 3.1 | 11.3 | 15.9 | 20.1 | 21.1 | 21.3 | 19.4 | 13.2 | 6.9 | 4.8 |
| Average temperature (°C) | -1.2 | -2.3 | -0.1 | 6.7 | 11.6 | 16.4 | 18.7 | 19.0 | 16.8 | 11.3 | 4.7 | 3.0 |
| Average night temperature (°C) | -2.7 | -4.8 | -2.7 | 3.0 | 7.9 | 13.4 | 16.8 | 17.0 | 14.7 | 9.9 | 2.9 | 1.6 |
| Absolute minimum temperature (°C) | -12.2 | -13.7 | -8.7 | -4.3 | 1.1 | 8.3 | 13.3 | 11.3 | 9.7 | 0.9 | -5.0 | -2.8 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.3 | 10.5 | 11.9 | 13.5 | 14.8 | 15.5 | 15.1 | 14.0 | 12.5 | 11.0 | 9.6 | 8.9 |
| Daylight minimum duration (h) | 8.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 8.0 |
| Sunshine mean duration (h) | 2.2 | 5.6 | 7.0 | 9.0 | 10.5 | 11.8 | 13.1 | 11.2 | 9.5 | 5.7 | 5.6 | 4.0 |
| Precipitation (mm) | 60 | 88 | 75 | 55 | 57 | 53 | 76 | 142 | 34 | 130 | 65 | 53 |
| Sunny days | 6 | 11 | 9 | 16 | 21 | 20 | 18 | 14 | 21 | 8 | 12 | 12 |
| Rainy days | 13 | 8 | 10 | 13 | 10 | 10 | 13 | 17 | 9 | 23 | 15 | 17 |
| Snow days | 12 | 9 | 12 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 2 |
The best time to visit Williamsport during the most sunny months:
Months with the longest average daylight duration in Williamsport:
The largest precipitation sum in Williamsport is at