| 09:52 PST |  Overcast | -4°C / 25°F | -7°C / 19°F | 80% | 1031 mb (30.45 in) | N 11 kph (N 6.9 mph) | - | 10SM |
| | KMWH 251752Z 36006KT 10SM OVC030 M04/M07 A3046 RMK AO2 SLP335 T10391067 11039 21089 53004 |
| 09:16 PST |  Overcast | -5°C / 23°F | -7°C / 19°F | 86% | 1031 mb (30.45 in) | N 11 kph (N 6.9 mph) | - | 10SM |
| | KMWH 251716Z 35006KT 10SM OVC030 M05/M07 A3046 RMK AO2 |
| 08:52 PST |  Overcast | -6°C / 21°F | -7°C / 19°F | 93% | 1031 mb (30.45 in) | N 9 kph (N 5.8 mph) | - | 10SM |
| | KMWH 251652Z 35005KT 10SM OVC028 M06/M07 A3046 RMK AO2 SLP334 T10561072 |
| 07:52 PST |  Mostly Cloudy | -7°C / 19°F | -9°C / 16°F | 86% | 1031 mb (30.45 in) | N 13 kph (N 8.1 mph) | - | 10SM |
| | KMWH 251552Z 36007KT 10SM BKN026 M07/M09 A3045 RMK AO2 SLP332 T10721094 |
| 07:47 PST |  Mostly Cloudy | -8°C / 18°F | -9°C / 16°F | 93% | 1031 mb (30.45 in) | N 13 kph (N 8.1 mph) | - | 10SM |
| | KMWH 251547Z 35007KT 10SM BKN026 M08/M09 A3045 RMK AO2 |
| 06:52 PST |  Clear | -9°C / 16°F | -10°C / 14°F | 93% | 1031 mb (30.45 in) | N 9 kph (N 5.8 mph) | - | 10SM |
| | KMWH 251452Z 36005KT 10SM CLR M09/M10 A3044 RMK AO2 SLP327 T10891100 56001 |
| 05:52 PST |  Clear | -8°C / 18°F | -10°C / 14°F | 86% | 1031 mb (30.45 in) | N 9 kph (N 5.8 mph) | - | 10SM |
| | KMWH 251352Z 01005KT 10SM CLR M08/M10 A3044 RMK AO2 SLP326 T10831100 |
| 04:52 PST |  Clear | -8°C / 18°F | -9°C / 16°F | 93% | 1030 mb (30.42 in) | N 13 kph (N 8.1 mph) | - | 10SM |
| | KMWH 251252Z 36007KT 10SM CLR M08/M09 A3043 RMK AO2 SLP324 T10781094 |
| 03:52 PST |  Clear | -7°C / 19°F | -9°C / 16°F | 86% | 1031 mb (30.45 in) | N 15 kph (N 9.2 mph) | - | 10SM |
| | KMWH 251152Z 35008KT 10SM CLR M07/M09 A3044 RMK AO2 SLP325 T10721089 11056 21078 53005 |
| 02:52 PST |  Clear | -7°C / 19°F | -9°C / 16°F | 86% | 1031 mb (30.45 in) | N 15 kph (N 9.2 mph) | - | 10SM |
| | KMWH 251052Z 35008KT 10SM CLR M07/M09 A3044 RMK AO2 SLP324 T10721089 |
| 01:52 PST |  Partly Cloudy | -7°C / 19°F | -9°C / 16°F | 86% | 1030 mb (30.42 in) | N 15 kph (N 9.2 mph) | - | 10SM |
| | KMWH 250952Z 35008KT 10SM FEW024 M07/M09 A3042 RMK AO2 SLP319 T10671089 |
| 01:19 PST |  Partly Cloudy | -7°C / 19°F | -9°C / 16°F | 86% | 1030 mb (30.42 in) | N 13 kph (N 8.1 mph) | - | 10SM |
| | KMWH 250919Z 35007KT 10SM SCT024 M07/M09 A3043 RMK AO2 |
| 00:52 PST |  Mostly Cloudy | -6°C / 21°F | -8°C / 18°F | 86% | 1030 mb (30.42 in) | N 11 kph (N 6.9 mph) | - | 10SM |
| | KMWH 250852Z 35006KT 10SM BKN024 M06/M08 A3042 RMK AO2 SLP318 T10611083 58001 |
| 00:28 PST |  Mostly Cloudy | -6°C / 21°F | -9°C / 16°F | 80% | 1030 mb (30.42 in) | NNW 11 kph (NNW 6.9 mph) | - | 10SM |
| | KMWH 250828Z 33006KT 10SM BKN024 BKN038 M06/M09 A3042 RMK AO2 |