| Point Forecast: Chambersburg PA 39.93N 77.66W (Elev. 617 ft) |
Last Update: 10:15 pm EDT May 16, 2025 |
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| Date | 05/17 | |||||||||||||||||||||||
| Hour (EDT) | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 |
| Temperature (°F) | 67 | 66 | 66 | 65 | 65 | 64 | 64 | 64 | 66 | 70 | 73 | 76 | 78 | 79 | 80 | 81 | 80 | 80 | 76 | 75 | 71 | 69 | 66 | 64 |
| Dewpoint (°F) | 65 | 65 | 63 | 62 | 62 | 62 | 61 | 61 | 62 | 62 | 62 | 62 | 61 | 59 | 58 | 58 | 57 | 57 | 56 | 57 | 56 | 55 | 54 | 53 |
| Heat Index (°F) | 76 | 78 | 79 | 81 | 81 | 80 | 80 | 76 | 75 | |||||||||||||||
| Surface Wind (mph) | 2 | 2 | 2 | 2 | 2 | 3 | 5 | 6 | 6 | 7 | 8 | 10 | 10 | 11 | 11 | 13 | 13 | 11 | 10 | 8 | 7 | 6 | 6 | 5 |
| Wind Dir | S | S | S | SW | S | S | SW | SW | SW | SW | SW | SW | W | SW | SW | W | W | W | W | W | W | W | W | W |
| Gust | 20 | 21 | 23 | 24 | 26 | 28 | 29 | 29 | 26 | 23 | 20 | |||||||||||||
| Sky Cover (%) | 64 | 59 | 62 | 78 | 84 | 85 | 87 | 70 | 69 | 52 | 35 | 18 | 19 | 20 | 21 | 31 | 40 | 50 | 53 | 56 | 34 | 42 | 36 | 46 |
| Precipitation Potential (%) | 4 | 17 | 50 | 63 | 62 | 45 | 34 | 13 | 7 | 7 | 7 | 12 | 12 | 12 | 11 | 11 | 11 | 20 | 20 | 20 | 2 | 3 | 2 | 2 |
| Relative Humidity (%) | 94 | 95 | 91 | 90 | 90 | 93 | 90 | 90 | 87 | 76 | 68 | 62 | 56 | 50 | 47 | 46 | 45 | 45 | 50 | 54 | 59 | 61 | 65 | 67 |
| Rain | -- | SChc | Chc | Lkly | Lkly | Chc | Chc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 05/18 | |||||||||||||||||||||||
| Hour (EDT) | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 |
| Temperature (°F) | 62 | 61 | 59 | 58 | 58 | 57 | 56 | 58 | 60 | 62 | 65 | 67 | 68 | 70 | 71 | 72 | 72 | 73 | 71 | 70 | 68 | 66 | 64 | 62 |
| Dewpoint (°F) | 53 | 52 | 51 | 51 | 50 | 49 | 49 | 50 | 50 | 50 | 51 | 51 | 51 | 52 | 52 | 52 | 52 | 52 | 52 | 52 | 52 | 52 | 51 | 51 |
| Heat Index (°F) | ||||||||||||||||||||||||
| Surface Wind (mph) | 5 | 3 | 3 | 3 | 3 | 5 | 6 | 6 | 7 | 8 | 9 | 10 | 11 | 11 | 11 | 11 | 11 | 11 | 10 | 8 | 7 | 6 | 6 | 6 |
| Wind Dir | W | W | W | W | W | SW | W | W | W | W | W | W | W | W | W | W | W | W | W | NW | NW | NW | NW | NW |
| Gust | 20 | 22 | 23 | 24 | 25 | 25 | 25 | 26 | 25 | 24 | 22 | 20 | ||||||||||||
| Sky Cover (%) | 33 | 38 | 13 | 19 | 23 | 28 | 25 | 26 | 27 | 34 | 40 | 47 | 46 | 46 | 45 | 38 | 31 | 24 | 23 | 21 | 20 | 19 | 17 | 16 |
| Precipitation Potential (%) | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 3 | 3 | 3 | 3 | 3 | 3 | 0 | 0 | 0 | 0 |
| Relative Humidity (%) | 72 | 72 | 75 | 77 | 75 | 75 | 77 | 73 | 69 | 65 | 60 | 56 | 55 | 53 | 51 | 50 | 49 | 48 | 50 | 53 | 57 | 60 | 63 | 67 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
