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| Point Forecast: 4 Miles SW Mount St Helens WA 46.15N 122.23W (Elev. 1017 m) |
Last Update: 12:02 am PST Dec 9, 2021 |
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| Date | 12/09 | |||||||||||||||||||||||
| Hour (PST) | 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) | -2 | -2 | -2 | -2 | -2 | -2 | -2 | -2 | -2 | -2 | -2 | -2 | -1 | -1 | -1 | -1 | -1 | -1 | -1 | -1 | -1 | -1 | -1 | -1 |
| Dewpoint (°C) | -2 | -2 | -2 | -3 | -3 | -3 | -3 | -2 | -2 | -2 | -2 | -2 | -2 | -3 | -3 | -3 | -3 | -2 | -2 | -1 | -2 | -2 | -3 | -2 |
| Wind Chill (°C) | -6 | -5 | -4 | -5 | -6 | -5 | -6 | -6 | -6 | -6 | -7 | -7 | -7 | -6 | -6 | -6 | -6 | -6 | -6 | -6 | -6 | -6 | -6 | -6 |
| Surface Wind (mph) | 7 | 6 | 5 | 6 | 7 | 6 | 7 | 7 | 7 | 7 | 10 | 9 | 11 | 10 | 9 | 8 | 9 | 9 | 9 | 8 | 8 | 8 | 9 | 9 |
| Wind Dir | W | WNW | W | W | W | W | WSW | W | W | WSW | W | W | W | W | W | W | W | W | W | W | W | W | W | W |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 71 | 83 | 83 | 83 | 88 | 88 | 88 | 84 | 84 | 84 | 89 | 89 | 89 | 87 | 87 | 87 | 84 | 84 | 84 | 83 | 83 | 83 | 80 | 80 |
| Precipitation Potential (%) | 83 | 83 | 83 | 83 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 93 | 93 | 93 | 93 | 93 | 93 | 69 | 69 |
| Relative Humidity (%) | 95 | 95 | 95 | 89 | 90 | 91 | 93 | 95 | 96 | 96 | 95 | 94 | 92 | 90 | 88 | 88 | 90 | 94 | 98 | 100 | 97 | 92 | 90 | 92 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Snow | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Lkly | Lkly |
| Freezing Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Sleet | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 12/10 | |||||||||||||||||||||||
| Hour (PST) | 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) | -1 | -1 | -1 | -2 | -2 | -2 | -1 | -1 | -1 | -1 | -1 | -1 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Dewpoint (°C) | -2 | -1 | -1 | -2 | -2 | -2 | -2 | -2 | -2 | -2 | -2 | -2 | -2 | -1 | -2 | -2 | -2 | -1 | 0 | 1 | 1 | 0 | 0 | -1 |
| Wind Chill (°C) | -6 | -6 | -6 | -7 | -6 | -6 | -6 | -4 | -4 | -4 | -4 | -4 | -3 | -3 | -3 | -3 | -3 | -3 | -3 | -4 | -4 | -3 | -3 | -3 |
| Surface Wind (mph) | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 6 | 6 | 6 | 7 | 7 | 7 | 7 | 7 | 7 | 8 | 8 | 8 | 10 | 10 | 10 | 11 | 11 |
| Wind Dir | W | W | W | W | W | W | W | WSW | WSW | WSW | SW | SW | SW | SSW | SSW | SSW | SSW | SSW | SSW | S | S | S | S | S |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 80 | 82 | 82 | 82 | 86 | 86 | 86 | 85 | 85 | 85 | 84 | 84 | 84 | 90 | 90 | 90 | 87 | 87 | 87 | 85 | 85 | 85 | 83 | 83 |
| Precipitation Potential (%) | 69 | 69 | 69 | 69 | 76 | 76 | 76 | 76 | 76 | 76 | 79 | 79 | 79 | 79 | 79 | 79 | 60 | 60 | 60 | 60 | 60 | 60 | 73 | 73 |
| Relative Humidity (%) | 97 | 100 | 100 | 98 | 95 | 95 | 95 | 95 | 94 | 92 | 91 | 91 | 91 | 91 | 89 | 86 | 86 | 90 | 97 | 100 | 98 | 95 | 91 | 88 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Snow | Lkly | Lkly | Lkly | Lkly | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly |
| Freezing Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Sleet | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
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