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| Point Forecast: Greenbelt MD 38.99N 76.89W (Elev. 102 ft) |
Last Update: 4:33 pm EDT May 19, 2022 |
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| Date | 05/19 | 05/20 | ||||||||||||||||||||||
| 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) | 79 | 78 | 77 | 74 | 71 | 69 | 68 | 67 | 65 | 65 | 64 | 63 | 64 | 65 | 70 | 74 | 78 | 81 | 84 | 87 | 89 | 90 | 89 | 90 |
| Dewpoint (°F) | 58 | 57 | 58 | 58 | 59 | 59 | 59 | 59 | 59 | 59 | 59 | 59 | 60 | 60 | 62 | 63 | 64 | 65 | 66 | 66 | 66 | 67 | 67 | 67 |
| Heat Index (°F) | 79 | 78 | 77 | 78 | 83 | 86 | 89 | 92 | 93 | 92 | 93 | |||||||||||||
| Surface Wind (mph) | 8 | 6 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 5 | 6 | 7 | 7 | 8 | 8 | 8 | 8 | 8 |
| Wind Dir | W | W | W | W | SW | SW | S | S | S | SE | S | SE | SE | SE | SE | S | S | S | S | S | S | S | S | S |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 28 | 23 | 5 | 11 | 9 | 15 | 19 | 44 | 20 | 25 | 34 | 43 | 52 | 48 | 47 | 46 | 45 | 42 | 39 | 36 | 34 | 32 | 30 | 27 |
| Precipitation Potential (%) | 8 | 3 | 3 | 3 | 2 | 2 | 2 | 3 | 6 | 6 | 6 | 12 | 12 | 12 | 11 | 11 | 11 | 9 | 9 | 9 | 14 | 14 | 14 | 17 |
| Relative Humidity (%) | 49 | 48 | 52 | 57 | 66 | 70 | 73 | 75 | 81 | 81 | 84 | 87 | 87 | 84 | 76 | 69 | 62 | 58 | 55 | 50 | 47 | 47 | 48 | 47 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc |
| Date | 05/21 | |||||||||||||||||||||||
| 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) | 90 | 87 | 85 | 83 | 81 | 76 | 75 | 75 | 75 | 74 | 73 | 73 | 76 | 77 | 79 | 82 | 86 | 89 | 91 | 93 | 94 | 95 | 95 | 94 |
| Dewpoint (°F) | 67 | 66 | 66 | 66 | 67 | 67 | 67 | 66 | 66 | 66 | 65 | 65 | 65 | 65 | 65 | 65 | 66 | 66 | 66 | 65 | 65 | 65 | 64 | 64 |
| Heat Index (°F) | 93 | 89 | 87 | 85 | 83 | 76 | 75 | 75 | 75 | 76 | 77 | 79 | 84 | 88 | 92 | 94 | 95 | 97 | 98 | 97 | 96 | |||
| Surface Wind (mph) | 8 | 7 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 6 | 6 | 6 | 6 | 6 | 6 | 5 | 5 | 6 | 6 | 7 |
| Wind Dir | S | S | S | S | S | S | S | SW | SW | SW | SW | SW | SW | SW | SW | SW | W | W | SW | SW | S | S | S | S |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 42 | 36 | 29 | 25 | 18 | 14 | 14 | 13 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 11 | 10 | 9 | 11 | 14 | 15 | 17 | 20 | 21 |
| Precipitation Potential (%) | 17 | 17 | 4 | 4 | 4 | 4 | 4 | 4 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 15 | 15 | 15 | 15 |
| Relative Humidity (%) | 47 | 50 | 53 | 57 | 63 | 74 | 76 | 74 | 74 | 76 | 76 | 76 | 69 | 67 | 62 | 56 | 51 | 47 | 44 | 40 | 39 | 37 | 36 | 37 |
| Rain | SChc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc | SChc |
| Thunder | SChc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
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