| Point Forecast: Frederick MD 39.44N 77.42W (Elev. 106 m) |
Last Update: 10:53 pm EDT Sep 11, 2026 |
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| Date | 09/12 | |||||||||||||||||||||||
| 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 (°C) | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 20 | 21 | 22 | 23 | 25 | 26 | 26 | 27 | 27 | 27 | 27 | 25 | 23 | 23 | 22 | 22 |
| Dewpoint (°C) | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 19 | 20 | 20 | 21 | 21 | 21 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 |
| Heat Index (°C) | 25 | 26 | 26 | 29 | 29 | 29 | 29 | 25 | ||||||||||||||||
| Surface Wind (mph) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 3 | 5 | 6 | 7 | 8 | 8 | 8 | 7 | 6 | 6 | 6 | 5 | 3 | 2 | 2 |
| Wind Dir | N | N | N | NE | NE | NE | NE | NE | NE | E | E | E | SE | SE | SE | S | SE | SE | SE | SE | SE | SE | S | S |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 43 | 49 | 56 | 66 | 77 | 80 | 83 | 79 | 81 | 80 | 78 | 85 | 88 | 85 | 87 | 91 | 89 | 95 | 85 | 84 | 92 | 93 | 90 | 94 |
| Precipitation Potential (%) | 0 | 0 | 1 | 1 | 1 | 4 | 6 | 8 | 17 | 18 | 15 | 9 | 6 | 5 | 15 | 18 | 22 | 21 | 29 | 43 | 19 | 21 | 46 | 78 |
| Relative Humidity (%) | 93 | 97 | 97 | 97 | 97 | 97 | 97 | 97 | 97 | 97 | 87 | 84 | 76 | 76 | 77 | 72 | 77 | 77 | 77 | 85 | 93 | 97 | 100 | 100 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc | -- | -- | -- | SChc | SChc | SChc | SChc | Chc | Chc | SChc | SChc | Chc | Ocnl |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc | SChc | Chc | Chc | SChc | SChc | Chc | SChc |
| Date | 09/13 | |||||||||||||||||||||||
| 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 (°C) | 22 | 22 | 22 | 22 | 22 | 22 | 21 | 21 | 22 | 22 | 23 | 24 | 26 | 27 | 28 | 28 | 29 | 29 | 28 | 27 | 26 | 24 | 23 | 22 |
| Dewpoint (°C) | 22 | 22 | 22 | 22 | 22 | 22 | 21 | 21 | 22 | 22 | 22 | 23 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 22 | 22 | 21 | 21 | 21 |
| Heat Index (°C) | 24 | 26 | 29 | 31 | 31 | 32 | 32 | 30 | 28 | 26 | 24 | |||||||||||||
| Surface Wind (mph) | 2 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 2 | 3 | 5 | 5 | 5 | 5 | 5 | 3 | 2 | 1 | 0 | 0 | 1 | 1 |
| Wind Dir | S | S | S | S | S | SW | SW | SW | W | W | W | NW | NW | NW | NW | NW | NW | NW | NW | W | W | W | W | W |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 92 | 89 | 86 | 87 | 93 | 96 | 92 | 84 | 80 | 70 | 62 | 53 | 53 | 53 | 31 | 30 | 30 | 29 | 25 | 22 | 18 | 23 | 29 | 34 |
| Precipitation Potential (%) | 87 | 64 | 71 | 76 | 83 | 68 | 39 | 30 | 29 | 29 | 29 | 29 | 29 | 29 | 8 | 8 | 8 | 8 | 8 | 8 | 3 | 3 | 3 | 3 |
| Relative Humidity (%) | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 97 | 90 | 85 | 79 | 74 | 70 | 67 | 67 | 69 | 74 | 79 | 84 | 90 | 97 |
| Rain | Ocnl | Lkly | Lkly | Ocnl | Ocnl | Lkly | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | SChc | SChc | SChc | SChc | SChc | -- | -- | -- | SChc | SChc | SChc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
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