| 10:53 PST |  Clear | -1°C / 30°F | -4°C / 25°F | 80% | 1028 mb (30.36 in) | SW 7 kph (SW 4.6 mph) | - | 10SM |
| | KALW 021853Z 22004KT 10SM CLR M01/M04 A3035 RMK AO2 SLP291 T10111044 |
| 09:53 PST |  Clear | -2°C / 28°F | -4°C / 25°F | 86% | 1028 mb (30.36 in) | SSE 7 kph (SSE 4.6 mph) | - | 10SM |
| | KALW 021753Z 20004KT 10SM CLR M02/M04 A3035 RMK AO2 SLP291 T10171039 11017 21044 51009 |
| 08:53 PST |  Clear | -3°C / 27°F | -4°C / 25°F | 93% | 1027 mb (30.33 in) | Calm | - | 10SM |
| | KALW 021653Z 00000KT 10SM CLR M03/M04 A3034 RMK AO2 SLP287 T10281044 |
| 07:53 PST |  Partly Cloudy | -4°C / 25°F | -6°C / 21°F | 86% | 1027 mb (30.33 in) | Calm | - | 10SM |
| | KALW 021553Z 00000KT 10SM FEW020 M04/M06 A3033 RMK AO2 SLP287 T10391056 |
| 06:53 PST |  Clear | -3°C / 27°F | -6°C / 21°F | 80% | 1027 mb (30.33 in) | Calm | - | 10SM |
| | KALW 021453Z 00000KT 10SM CLR M03/M06 A3032 RMK AO2 SLP282 T10331056 53003 |
| 05:53 PST |  Clear | -3°C / 27°F | -6°C / 21°F | 80% | 1027 mb (30.33 in) | Calm | - | 10SM |
| | KALW 021353Z AUTO 00000KT 10SM CLR M03/M06 A3032 RMK AO2 SLP281 T10331056 |
| 04:53 PST |  Clear | -3°C / 27°F | -6°C / 21°F | 80% | 1026 mb (30.3 in) | SE 6 kph (SE 3.5 mph) | - | 10SM |
| | KALW 021253Z AUTO 14003KT 10SM CLR M03/M06 A3031 RMK AO2 SLP277 T10331056 |
| 03:53 PST |  Clear | -3°C / 27°F | -6°C / 21°F | 80% | 1026 mb (30.3 in) | Calm | - | 10SM |
| | KALW 021153Z AUTO 00000KT 10SM CLR M03/M06 A3031 RMK AO2 SLP277 T10331056 11011 21039 51012 |
| 02:53 PST |  Clear | -2°C / 28°F | -4°C / 25°F | 86% | 1026 mb (30.3 in) | SSE 6 kph (SSE 3.5 mph) | - | 10SM |
| | KALW 021053Z AUTO 20003KT 10SM CLR M02/M04 A3030 RMK AO2 SLP272 T10221044 |
| 01:53 PST |  Clear | -2°C / 28°F | -4°C / 25°F | 86% | 1026 mb (30.3 in) | Calm | - | 10SM |
| | KALW 020953Z AUTO 00000KT 10SM CLR M02/M04 A3029 RMK AO2 SLP269 T10171039 |
| 00:53 PST |  Clear | -3°C / 27°F | -4°C / 25°F | 93% | 1025 mb (30.27 in) | Calm | - | 8SM |
| | KALW 020853Z AUTO 00000KT 8SM CLR M03/M04 A3027 RMK AO2 SLP264 T10281044 58003 |