| 12:54 MST |  Overcast | -2°C / 28°F | -7°C / 19°F | 69% | 1007 mb (29.74 in) | N 28 kph (N 17.3 mph) | - | 10SM |
| | KCOS 231954Z 01015KT 10SM SCT036 OVC049 M02/M07 A2973 RMK AO2 SLP106 T10171067 |
| 12:49 MST |  Overcast | -2°C / 28°F | -7°C / 19°F | 69% | 1007 mb (29.74 in) | N 20 kph (N 12.7 mph) | - | 10SM |
| | KCOS 231949Z 36011KT 10SM SCT036 OVC047 M02/M07 A2973 RMK AO2 |
| 12:41 MST |  Overcast | -2°C / 28°F | -7°C / 19°F | 69% | 1007 mb (29.74 in) | N 20 kph (N 12.7 mph) | - | 9SM |
| | KCOS 231941Z 01011KT 9SM BKN029 BKN042 OVC049 M02/M07 A2973 RMK AO2 |
| 11:54 MST |  Overcast | -2°C / 28°F | -7°C / 19°F | 69% | 1007 mb (29.74 in) | N 32 kph (N 19.6 mph) | 0.00 mm (0.00 in) | 10SM |
| | KCOS 231854Z 01017G23KT 10SM BKN037 OVC050 M02/M07 A2974 RMK AO2 SNE25 SLP108 P0000 T10171067 |
| 11:42 MST |  Overcast | -1°C / 30°F | -6°C / 21°F | 69% | 1007 mb (29.74 in) | N 24 kph (N 15 mph) | 0.00 mm (0.00 in) | 10SM |
| | KCOS 231842Z 01013KT 10SM FEW023 SCT035 OVC050 M01/M06 A2975 RMK AO2 SNE25 P0000 |
| 11:10 MST |  Overcast Light Snow | -4°C / 25°F | -6°C / 21°F | 86% | 1007 mb (29.74 in) | Calm | 0.00 mm (0.00 in) | 3SM |
| | KCOS 231810Z 00000KT 3SM -SN BR SCT016 BKN023 OVC046 M04/M06 A2975 RMK AO2 P0000 |
| 10:54 MST |  Overcast Light Snow | -4°C / 25°F | -6°C / 21°F | 86% | 1007 mb (29.74 in) | S 9 kph (S 5.8 mph) | 0.25 mm (0.01 in) | 1 1/4SM |
| | KCOS 231754Z 17005KT 1 1/4SM -SN BR BKN016 OVC044 M04/M06 A2975 RMK AO2 SLP114 P0001 60002 T10441056 11028 21056 50006 |
| 10:46 MST |  Overcast Light Snow | -4°C / 25°F | -6°C / 21°F | 86% | 1007 mb (29.74 in) | Calm | 0.25 mm (0.01 in) | 1 1/4SM |
| | KCOS 231746Z 00000KT 1 1/4SM -SN BR BKN016 OVC044 M04/M06 A2975 RMK AO2 P0001 |
| 09:54 MST |  Overcast Light Snow | -4°C / 25°F | -6°C / 21°F | 86% | 1008 mb (29.77 in) | SSE 7 kph (SSE 4.6 mph) | 0.25 mm (0.01 in) | 1 1/4SM |
| | KCOS 231654Z 20004KT 1 1/4SM -SN BR OVC033 M04/M06 A2977 RMK AO2 SLP119 P0001 T10441056 |
| 09:39 MST |  Overcast Light Snow | -3°C / 27°F | -6°C / 21°F | 80% | 1008 mb (29.77 in) | Calm | 0.25 mm (0.01 in) | 3/4SM |
| | KCOS 231639Z 00000KT 3/4SM R17L/P6000FT -SN BR SCT010 SCT017 OVC033 M03/M06 A2977 RMK AO2 P0001 |
| 08:54 MST |  Overcast Light Snow | -3°C / 27°F | -6°C / 21°F | 80% | 1008 mb (29.77 in) | N 9 kph (N 5.8 mph) | 0.00 mm (0.00 in) | 3/4SM |
| | KCOS 231554Z 35005KT 3/4SM R17L/5500VP6000FT -SN BR BKN012 BKN017 OVC029 M03/M06 A2976 RMK AO2 SNB28 SLP112 P0000 T10331056 |
| 08:50 MST |  Overcast Light Snow | -3°C / 27°F | -6°C / 21°F | 80% | 1008 mb (29.77 in) | N 6 kph (N 3.5 mph) | 0.00 mm (0.00 in) | 3/4SM |
| | KCOS 231550Z 35003KT 3/4SM R17L/5500VP6000FT -SN BR SCT012 BKN017 OVC031 M03/M06 A2976 RMK AO2 SNB28 P0000 |
| 08:41 MST |  Overcast Light Snow | -3°C / 27°F | -6°C / 21°F | 80% | 1007 mb (29.74 in) | N 9 kph (N 5.8 mph) | 0.00 mm (0.00 in) | 1 3/4SM |
| | KCOS 231541Z 35005KT 1 3/4SM -SN FEW017 BKN031 OVC040 M03/M06 A2975 RMK AO2 SNB28 P0000 |
| 07:54 MST |  Overcast | -3°C / 27°F | -7°C / 19°F | 74% | 1007 mb (29.74 in) | N 20 kph (N 12.7 mph) | - | 8SM |
| | KCOS 231454Z 35011KT 8SM OVC042 M03/M07 A2973 RMK AO2 SLP103 T10331067 51011 |
| 06:54 MST |  Overcast | -4°C / 25°F | -7°C / 19°F | 80% | 1006 mb (29.71 in) | N 24 kph (N 15 mph) | - | 9SM |
| | KCOS 231354Z 35013KT 9SM SCT042 OVC049 M04/M07 A2972 RMK AO2 SLP098 T10391067 $ |
| 05:54 MST |  Overcast Fog And Mist | -4°C / 25°F | -6°C / 21°F | 86% | 1006 mb (29.71 in) | N 17 kph (N 10.4 mph) | - | 3SM |
| | KCOS 231254Z 36009KT 3SM BR OVC035 M04/M06 A2971 RMK AO2 SLP099 T10441061 $ |
| 05:44 MST |  Overcast Fog And Mist | -4°C / 25°F | -6°C / 21°F | 86% | 1006 mb (29.71 in) | N 19 kph (N 11.5 mph) | - | 3SM |
| | KCOS 231244Z 01010KT 3SM BR OVC031 M04/M06 A2971 RMK AO2 $ |
| 05:35 MST |  Overcast Fog And Mist | -4°C / 25°F | -6°C / 21°F | 86% | 1006 mb (29.71 in) | NE 6 kph (NE 3.5 mph) | - | 3SM |
| | KCOS 231235Z 04003KT 3SM BR OVC029 M04/M06 A2970 RMK AO2 $ |
| 05:29 MST |  Overcast Fog And Mist | -5°C / 23°F | -6°C / 21°F | 93% | 1006 mb (29.71 in) | Variable 6 kph (Variable 3.5 mph) | - | 1SM |
| | KCOS 231229Z VRB03KT 1SM R17L/P6000FT BR OVC029 M05/M06 A2970 RMK AO2 $ |
| 04:54 MST |  Overcast Fog | -6°C / 21°F | -6°C / 21°F | 100% | 1005 mb (29.68 in) | S 9 kph (S 5.8 mph) | - | 1/4SM |
| | KCOS 231154Z AUTO 19005KT 1/4SM R17L/2200V3500FT FZFG OVC027 M06/M06 A2969 RMK AO2 SLP093 60007 70029 T10561061 11017 21061 53003 TSNO $ |
| 04:34 MST |  Overcast Fog | -6°C / 21°F | -6°C / 21°F | 100% | 1005 mb (29.68 in) | S 7 kph (S 4.6 mph) | - | 1/4SM |
| | KCOS 231134Z AUTO 18004KT 1/4SM R17L/2000VP6000FT FZFG BKN027 OVC036 M06/M06 A2969 RMK AO2 TSNO $ |
| 03:54 MST |  Overcast Fog | -6°C / 21°F | -6°C / 21°F | 100% | 1005 mb (29.68 in) | SSE 7 kph (SSE 4.6 mph) | - | 1/4SM |
| | KCOS 231054Z AUTO 20004KT 1/4SM R17L/1200V1400FT FZFG FEW002 BKN042 OVC095 M06/M06 A2968 RMK AO2 SLP083 T10561061 TSNO $ |
| 03:51 MST |  Overcast Fog | -6°C / 21°F | -6°C / 21°F | 100% | 1005 mb (29.68 in) | SW 9 kph (SW 5.8 mph) | - | 1/4SM |
| | KCOS 231051Z AUTO 21005KT 1/4SM R17L/1400VP6000FT FZFG FEW002 BKN050 OVC095 M06/M06 A2968 RMK AO2 TSNO $ |
| 03:24 MST |  Overcast Fog And Mist | -6°C / 21°F | -6°C / 21°F | 100% | 1005 mb (29.68 in) | Calm | - | 3/4SM |
| | KCOS 231024Z AUTO 00000KT 3/4SM R17L/2600V4500FT BR FEW002 BKN075 OVC095 M06/M06 A2968 RMK AO2 TSNO $ |
| 03:20 MST |  Overcast Fog And Mist | -5°C / 23°F | -6°C / 21°F | 93% | 1005 mb (29.68 in) | Calm | - | 1 1/4SM |
| | KCOS 231020Z AUTO 00000KT 1 1/4SM R17L/2600VP6000FT BR BKN080 OVC095 M05/M06 A2968 RMK AO2 TSNO $ |
| 03:11 MST |  Overcast Fog And Mist | -5°C / 23°F | -6°C / 21°F | 93% | 1005 mb (29.68 in) | Calm | - | 2SM |
| | KCOS 231011Z AUTO 00000KT 2SM BR BKN080 OVC095 M05/M06 A2968 RMK AO2 TSNO $ |
| 02:54 MST |  Overcast Fog And Mist | -5°C / 23°F | -6°C / 21°F | 93% | 1005 mb (29.68 in) | SSW 6 kph (SSW 3.5 mph) | - | 4SM |
| | KCOS 230954Z AUTO 26003KT 4SM BR BKN075 OVC095 M05/M06 A2968 RMK AO2 SLP080 T10501056 TSNO $ |
| 02:36 MST |  Overcast Fog And Mist | -5°C / 23°F | -6°C / 21°F | 93% | 1005 mb (29.68 in) | W 6 kph (W 3.5 mph) | - | 5SM |
| | KCOS 230936Z AUTO 27003KT 5SM BR SCT020 OVC075 M05/M06 A2968 RMK AO2 TSNO $ |
| 02:12 MST |  Overcast Fog And Mist | -5°C / 23°F | -6°C / 21°F | 93% | 1005 mb (29.68 in) | Calm | - | 5SM |
| | KCOS 230912Z AUTO 5SM BR SCT020 BKN026 OVC065 M05/M06 A2968 RMK AO2 TSNO $ |
| 01:54 MST |  Overcast Fog And Mist | -5°C / 23°F | -6°C / 21°F | 93% | 1005 mb (29.68 in) | Calm | 0.00 mm (0.00 in) | 5SM |
| | KCOS 230854Z 5SM BR SCT031 OVC065 M05/M06 A2968 RMK AO2 SNE32 SLP079 P0000 60007 T10501056 57000 $ |
| 01:24 MST |  Overcast Light Snow | -4°C / 25°F | -5°C / 23°F | 93% | 1005 mb (29.68 in) | Calm | 0.00 mm (0.00 in) | 3SM |
| | KCOS 230824Z 00000KT 3SM -SN BR FEW021 BKN041 OVC065 M04/M05 A2968 RMK AO2 P0000 $ |
| 00:54 MST |  Overcast Light Snow | -4°C / 25°F | -5°C / 23°F | 93% | 1005 mb (29.68 in) | Calm | 0.51 mm (0.02 in) | 2SM |
| | KCOS 230754Z 2SM -SN BR FEW006 OVC019 M04/M05 A2968 RMK AO2 SLP076 P0002 T10391050 $ |
| 00:29 MST |  Overcast Light Snow | -3°C / 27°F | -4°C / 25°F | 93% | 1005 mb (29.68 in) | SE 13 kph (SE 8.1 mph) | 0.25 mm (0.01 in) | 2SM |
| | KCOS 230729Z 12007KT 2SM -SN BR SCT004 BKN015 OVC026 M03/M04 A2968 RMK AO2 P0001 |
| 00:07 MST |  Overcast Light Snow | -3°C / 27°F | -4°C / 25°F | 93% | 1005 mb (29.68 in) | SE 15 kph (SE 9.2 mph) | 0.25 mm (0.01 in) | 1 1/4SM |
| | KCOS 230707Z 12008KT 1 1/4SM -SN BR SCT006 BKN016 OVC032 M03/M04 A2968 RMK AO2 P0001 |