| Point Forecast: Chambersburg PA 39.93N 77.66W (Elev. 617 ft) |
Last Update: 1:30 pm EDT Jun 18, 2025 |
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| Date | 06/18 | 06/19 | ||||||||||||||||||||||
| Hour (EDT) | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 |
| Temperature (°F) | 83 | 82 | 81 | 79 | 76 | 74 | 73 | 72 | 71 | 71 | 71 | 70 | 69 | 71 | 73 | 77 | 80 | 84 | 85 | 86 | 87 | 86 | 84 | 84 |
| Dewpoint (°F) | 74 | 73 | 73 | 73 | 73 | 73 | 72 | 71 | 70 | 70 | 70 | 69 | 69 | 69 | 70 | 71 | 72 | 72 | 72 | 72 | 72 | 71 | 71 | 70 |
| Heat Index (°F) | 89 | 87 | 86 | 79 | 76 | 77 | 84 | 90 | 91 | 92 | 94 | 91 | 89 | 88 | ||||||||||
| Surface Wind (mph) | 6 | 5 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 3 | 3 | 5 | 6 | 6 | 7 | 8 | 9 | 10 | 10 | 10 | 10 | 9 |
| Wind Dir | SW | SW | SW | SW | SW | S | S | S | S | S | S | S | S | S | S | SW | SW | SW | SW | SW | SW | SW | SW | SW |
| Gust | 20 | 21 | 21 | 21 | 21 | 20 | ||||||||||||||||||
| Sky Cover (%) | 52 | 33 | 15 | 18 | 22 | 26 | 24 | 26 | 25 | 19 | 21 | 20 | 21 | 21 | 58 | 58 | 58 | 58 | 58 | 79 | 100 | 100 | 100 | 100 |
| Precipitation Potential (%) | 32 | 19 | 5 | 5 | 6 | 6 | 5 | 4 | 3 | 3 | 3 | 2 | 5 | 10 | 13 | 13 | 13 | 43 | 43 | 43 | 82 | 82 | 82 | 80 |
| Relative Humidity (%) | 73 | 74 | 75 | 82 | 89 | 98 | 97 | 96 | 95 | 97 | 97 | 97 | 100 | 93 | 90 | 82 | 77 | 67 | 65 | 63 | 61 | 61 | 65 | 63 |
| Rain | Chc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | Chc | Chc | Chc | Ocnl | Ocnl | Ocnl | Ocnl |
| Thunder | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | Chc | Chc | Chc | Lkly | Lkly | Lkly | Lkly |
| Date | 06/20 | |||||||||||||||||||||||
| Hour (EDT) | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 |
| Temperature (°F) | 81 | 79 | 77 | 74 | 72 | 70 | 68 | 67 | 65 | 64 | 63 | 62 | 63 | 64 | 65 | 68 | 72 | 75 | 77 | 80 | 82 | 83 | 83 | 84 |
| Dewpoint (°F) | 69 | 69 | 68 | 68 | 67 | 66 | 65 | 63 | 62 | 61 | 61 | 60 | 60 | 61 | 61 | 61 | 62 | 62 | 62 | 62 | 62 | 62 | 63 | 63 |
| Heat Index (°F) | 84 | 79 | 77 | 75 | 77 | 81 | 83 | 84 | 84 | 85 | ||||||||||||||
| Surface Wind (mph) | 8 | 7 | 6 | 6 | 6 | 5 | 5 | 3 | 3 | 3 | 3 | 3 | 3 | 5 | 5 | 5 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 |
| Wind Dir | W | W | W | W | W | W | W | W | W | W | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW | W | W |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 86 | 72 | 47 | 52 | 41 | 29 | 27 | 24 | 22 | 19 | 17 | 14 | 13 | 13 | 12 | 12 | 12 | 12 | 13 | 15 | 16 | 16 | 16 | 16 |
| Precipitation Potential (%) | 80 | 80 | 5 | 5 | 5 | 5 | 5 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 2 | 2 | 2 |
| Relative Humidity (%) | 67 | 72 | 74 | 82 | 84 | 87 | 88 | 89 | 90 | 91 | 92 | 93 | 91 | 89 | 87 | 78 | 71 | 64 | 59 | 55 | 51 | 50 | 50 | 49 |
| Rain | Ocnl | Ocnl | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | Lkly | Lkly | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
