| 13:54 MST |  Overcast Light Snow | -9°C / 16°F | -13°C / 9°F | 73% | 1009 mb (29.8 in) | E 15 kph (E 9.2 mph) | 0.00 mm (0.00 in) | 3SM |
| | KCOS 062054Z 10008KT 3SM -SN BKN021 BKN026 OVC033 M09/M13 A2980 RMK AO2 SNB37 SLP161 P0000 60000 T10891133 55006 |
| 13:40 MST |  Overcast Light Snow | -9°C / 16°F | -14°C / 7°F | 67% | 1009 mb (29.8 in) | Variable 7 kph (Variable 4.6 mph) | 0.00 mm (0.00 in) | 2 1/2SM |
| | KCOS 062040Z VRB04KT 2 1/2SM -SN FEW018 BKN026 OVC035 M09/M14 A2980 RMK AO2 SNB37 P0000 |
| 12:54 MST |  Overcast | -8°C / 18°F | -14°C / 7°F | 62% | 1009 mb (29.8 in) | SE 17 kph (SE 10.4 mph) | - | 9SM |
| | KCOS 061954Z 12009KT 9SM FEW025 OVC034 M08/M14 A2980 RMK AO2 SLP155 T10831139 |
| 12:52 MST |  Overcast | -8°C / 18°F | -14°C / 7°F | 62% | 1009 mb (29.8 in) | SE 17 kph (SE 10.4 mph) | - | 9SM |
| | KCOS 061952Z 12009KT 9SM FEW025 OVC034 M08/M14 A2980 RMK AO2 |
| 12:26 MST |  Overcast | -8°C / 18°F | -14°C / 7°F | 62% | 1009 mb (29.8 in) | ESE 19 kph (ESE 11.5 mph) | - | 9SM |
| | KCOS 061926Z AUTO 11010KT 9SM BKN026 OVC034 M08/M14 A2980 RMK AO2 TSNO |
| 11:54 MST |  Overcast | -8°C / 18°F | -14°C / 7°F | 62% | 1010 mb (29.83 in) | E 17 kph (E 10.4 mph) | - | 10SM |
| | KCOS 061854Z 09009KT 10SM FEW024 BKN030 OVC047 M08/M14 A2982 RMK AO2 SLP160 T10781139 |
| 11:06 MST |  Mostly Cloudy | -9°C / 16°F | -14°C / 7°F | 67% | 1010 mb (29.83 in) | ESE 15 kph (ESE 9.2 mph) | - | 10SM |
| | KCOS 061806Z 11008KT 10SM BKN030 BKN049 M09/M14 A2984 RMK AO2 |
| 10:54 MST |  Overcast | -9°C / 16°F | -14°C / 7°F | 67% | 1010 mb (29.83 in) | E 19 kph (E 11.5 mph) | 0.00 mm (0.00 in) | 10SM |
| | KCOS 061754Z 10010KT 10SM OVC028 M09/M14 A2984 RMK AO2 SNE1656 SLP172 P0000 60004 T10891139 11089 21106 50000 |
| 10:21 MST |  Overcast Hazy | -9°C / 16°F | -14°C / 7°F | 67% | 1011 mb (29.85 in) | E 19 kph (E 11.5 mph) | 0.00 mm (0.00 in) | 4SM |
| | KCOS 061721Z 10010KT 4SM HZ OVC026 M09/M14 A2986 RMK AO2 SNE1656 P0000 |
| 10:08 MST |  Overcast Hazy | -9°C / 16°F | -13°C / 9°F | 73% | 1011 mb (29.85 in) | E 20 kph (E 12.7 mph) | 0.00 mm (0.00 in) | 2SM |
| | KCOS 061708Z 10011KT 2SM HZ OVC024 M09/M13 A2986 RMK AO2 VIS 1 1/4V3 SNE1656 P0000 |
| 09:54 MST |  Overcast Light Snow | -9°C / 16°F | -13°C / 9°F | 73% | 1012 mb (29.88 in) | E 19 kph (E 11.5 mph) | 0.00 mm (0.00 in) | 1 1/2SM |
| | KCOS 061654Z 10010KT 1 1/2SM -SN BKN019 BKN025 OVC030 M09/M13 A2987 RMK AO2 SLP180 P0000 T10941128 |
| 09:44 MST |  Overcast Light Snow | -10°C / 14°F | -13°C / 9°F | 79% | 1012 mb (29.88 in) | E 19 kph (E 11.5 mph) | 0.00 mm (0.00 in) | 1 1/4SM |
| | KCOS 061644Z 09010KT 1 1/4SM -SN BKN017 OVC031 M10/M13 A2987 RMK AO2 P0000 |
| 09:31 MST |  Obscured Light Snow | -10°C / 14°F | -13°C / 9°F | 79% | 1012 mb (29.88 in) | E 19 kph (E 11.5 mph) | 0.00 mm (0.00 in) | 1SM |
| | KCOS 061631Z 09010KT 1SM R17L/P6000FT -SN VV013 M10/M13 A2987 RMK AO2 P0000 |
| 09:01 MST |  Overcast Light Snow | -10°C / 14°F | -13°C / 9°F | 79% | 1011 mb (29.85 in) | E 19 kph (E 11.5 mph) | 0.00 mm (0.00 in) | 1 3/4SM |
| | KCOS 061601Z 09010KT 1 3/4SM -SN OVC018 M10/M13 A2986 RMK AO2 P0000 |
| 08:54 MST |  Obscured Light Snow | -11°C / 12°F | -13°C / 9°F | 85% | 1011 mb (29.85 in) | E 19 kph (E 11.5 mph) | 0.25 mm (0.01 in) | 3/4SM |
| | KCOS 061554Z 09010KT 3/4SM R17L/P6000FT -SN VV018 M11/M13 A2986 RMK AO2 SLP180 P0001 T11061133 |
| 07:54 MST |  Obscured Light Snow | -10°C / 14°F | -12°C / 10°F | 85% | 1010 mb (29.83 in) | E 6 kph (E 3.5 mph) | 0.25 mm (0.01 in) | 3/4SM |
| | KCOS 061454Z 09003KT 3/4SM R17L/5500VP6000FT -SN BR VV014 M10/M12 A2984 RMK AO2 SLP172 P0001 60003 T11001122 53012 |
| 07:15 MST |  Overcast Light Snow | -10°C / 14°F | -13°C / 9°F | 79% | 1010 mb (29.83 in) | E 6 kph (E 3.5 mph) | 0.00 mm (0.00 in) | 3/4SM |
| | KCOS 061415Z 08003KT 3/4SM R17L/P6000FT -SN BKN014 BKN021 OVC027 M10/M13 A2983 RMK AO2 P0000 |
| 06:54 MST |  Overcast Light Snow | -9°C / 16°F | -13°C / 9°F | 73% | 1010 mb (29.83 in) | E 9 kph (E 5.8 mph) | 0.25 mm (0.01 in) | 2 1/2SM |
| | KCOS 061354Z 08005KT 2 1/2SM -SN BKN024 OVC042 M09/M13 A2983 RMK AO2 SLP161 P0001 T10941128 |
| 06:48 MST |  Overcast Light Snow | -9°C / 16°F | -12°C / 10°F | 79% | 1010 mb (29.83 in) | E 6 kph (E 3.5 mph) | 0.25 mm (0.01 in) | 2 1/2SM |
| | KCOS 061348Z 08003KT 2 1/2SM -SN BKN027 OVC042 M09/M12 A2983 RMK AO2 P0001 |
| 06:15 MST |  Overcast Light Snow | -9°C / 16°F | -12°C / 10°F | 79% | 1010 mb (29.83 in) | NE 9 kph (NE 5.8 mph) | 0.00 mm (0.00 in) | 4SM |
| | KCOS 061315Z 04005KT 4SM -SN SCT023 BKN034 OVC042 M09/M12 A2982 RMK AO2 P0000 |
| 06:08 MST |  Overcast Light Snow | -9°C / 16°F | -12°C / 10°F | 79% | 1010 mb (29.83 in) | NE 7 kph (NE 4.6 mph) | 0.00 mm (0.00 in) | 2 1/2SM |
| | KCOS 061308Z 04004KT 2 1/2SM -SN BR BKN023 BKN034 OVC042 M09/M12 A2982 RMK AO2 P0000 |
| 05:54 MST |  Overcast Light Snow | -9°C / 16°F | -12°C / 10°F | 79% | 1009 mb (29.8 in) | NE 7 kph (NE 4.6 mph) | 0.25 mm (0.01 in) | 1 3/4SM |
| | KCOS 061254Z 03004KT 1 3/4SM -SN BR BKN023 OVC032 M09/M12 A2981 RMK AO2 SLP153 P0001 T10941117 |
| 05:44 MST |  Overcast Light Snow | -9°C / 16°F | -12°C / 10°F | 79% | 1009 mb (29.8 in) | NE 7 kph (NE 4.6 mph) | 0.25 mm (0.01 in) | 1 1/2SM |
| | KCOS 061244Z 04004KT 1 1/2SM -SN BR BKN019 OVC032 M09/M12 A2981 RMK AO2 P0001 |
| 05:22 MST |  Overcast Light Snow | -9°C / 16°F | -12°C / 10°F | 79% | 1009 mb (29.8 in) | NE 11 kph (NE 6.9 mph) | 0.25 mm (0.01 in) | 1SM |
| | KCOS 061222Z 04006KT 1SM R17L/P6000FT -SN BR BKN011 OVC026 M09/M12 A2981 RMK AO2 P0001 |
| 05:12 MST |  Overcast Light Snow | -9°C / 16°F | -12°C / 10°F | 79% | 1009 mb (29.8 in) | NE 11 kph (NE 6.9 mph) | 0.00 mm (0.00 in) | 1 1/4SM |
| | KCOS 061212Z 03006KT 1 1/4SM -SN BR BKN015 OVC026 M09/M12 A2981 RMK AO2 P0000 |
| 05:05 MST |  Overcast Light Snow | -9°C / 16°F | -12°C / 10°F | 79% | 1009 mb (29.8 in) | NNE 9 kph (NNE 5.8 mph) | 0.00 mm (0.00 in) | 2SM |
| | KCOS 061205Z 02005KT 2SM -SN BR BKN015 OVC028 M09/M12 A2981 RMK AO2 P0000 |
| 04:54 MST |  Overcast Light Snow | -9°C / 16°F | -11°C / 12°F | 86% | 1009 mb (29.8 in) | NE 7 kph (NE 4.6 mph) | 0.76 mm (0.03 in) | 1 1/2SM |
| | KCOS 061154Z 03004KT 1 1/2SM -SN BR OVC015 M09/M11 A2980 RMK AO2 SLP144 P0003 60003 70003 T10941111 11056 21094 50000 |
| 04:32 MST |  Overcast Light Snow | -9°C / 16°F | -11°C / 12°F | 86% | 1009 mb (29.8 in) | NE 9 kph (NE 5.8 mph) | 0.51 mm (0.02 in) | 1 1/4SM |
| | KCOS 061132Z 04005KT 1 1/4SM -SN BR OVC007 M09/M11 A2980 RMK AO2 P0002 |
| 04:13 MST |  Obscured Light Snow | -9°C / 16°F | -11°C / 12°F | 86% | 1009 mb (29.8 in) | NE 11 kph (NE 6.9 mph) | 0.25 mm (0.01 in) | 3/4SM |
| | KCOS 061113Z 04006KT 3/4SM R17L/P6000FT -SN BR VV009 M09/M11 A2980 RMK AO2 P0001 |
| 04:02 MST |  Overcast Light Snow | -9°C / 16°F | -12°C / 10°F | 79% | 1009 mb (29.8 in) | NNE 7 kph (NNE 4.6 mph) | 0.25 mm (0.01 in) | 1 1/2SM |
| | KCOS 061102Z 02004KT 1 1/2SM -SN BKN014 OVC025 M09/M12 A2981 RMK AO2 P0001 |
| 03:54 MST |  Overcast Light Snow | -9°C / 16°F | -12°C / 10°F | 79% | 1009 mb (29.8 in) | NNE 11 kph (NNE 6.9 mph) | 0.00 mm (0.00 in) | 2SM |
| | KCOS 061054Z 02006KT 2SM -SN OVC020 M09/M12 A2980 RMK AO2 SLP136 P0000 T10891117 |
| 03:43 MST |  Overcast Light Snow | -9°C / 16°F | -12°C / 10°F | 79% | 1009 mb (29.8 in) | NNE 13 kph (NNE 8.1 mph) | 0.00 mm (0.00 in) | 2 1/2SM |
| | KCOS 061043Z 02007KT 2 1/2SM -SN OVC024 M09/M12 A2980 RMK AO2 P0000 |
| 03:32 MST |  Overcast Light Snow | -9°C / 16°F | -12°C / 10°F | 79% | 1009 mb (29.8 in) | NNE 17 kph (NNE 10.4 mph) | 0.00 mm (0.00 in) | 3SM |
| | KCOS 061032Z 02009KT 3SM -SN OVC024 M09/M12 A2980 RMK AO2 P0000 |
| 03:06 MST |  Overcast Light Snow | -9°C / 16°F | -12°C / 10°F | 79% | 1009 mb (29.8 in) | NE 9 kph (NE 5.8 mph) | 0.00 mm (0.00 in) | 2 1/2SM |
| | KCOS 061006Z AUTO 03005KT 2 1/2SM -SN OVC018 M09/M12 A2981 RMK AO2 P0000 TSNO |
| 02:54 MST |  Overcast Light Snow | -8°C / 18°F | -12°C / 10°F | 73% | 1009 mb (29.8 in) | NE 17 kph (NE 10.4 mph) | 0.00 mm (0.00 in) | 1 1/2SM |
| | KCOS 060954Z AUTO 05009KT 1 1/2SM -SN OVC020 M08/M12 A2981 RMK AO2 SNB30 SLP133 P0000 T10831122 TSNO |
| 02:41 MST |  Overcast Light Snow | -8°C / 18°F | -13°C / 9°F | 68% | 1010 mb (29.83 in) | NE 15 kph (NE 9.2 mph) | 0.00 mm (0.00 in) | 2SM |
| | KCOS 060941Z AUTO 05008KT 2SM -SN OVC022 M08/M13 A2982 RMK AO2 SNB30 P0000 TSNO |
| 02:34 MST |  Overcast Light Snow | -8°C / 18°F | -14°C / 7°F | 62% | 1009 mb (29.8 in) | NE 13 kph (NE 8.1 mph) | 0.00 mm (0.00 in) | 3SM |
| | KCOS 060934Z AUTO 05007KT 3SM -SN BKN026 OVC035 M08/M14 A2981 RMK AO2 SNB30 P0000 TSNO |
| 01:54 MST |  Overcast | -8°C / 18°F | -16°C / 3°F | 53% | 1009 mb (29.8 in) | NE 17 kph (NE 10.4 mph) | - | 10SM |
| | KCOS 060854Z AUTO 04009KT 10SM FEW044 BKN060 OVC090 M08/M16 A2980 RMK AO2 SLP125 T10781156 58005 TSNO $ |
| 00:54 MST |  Overcast | -7°C / 19°F | -14°C / 7°F | 58% | 1009 mb (29.8 in) | NE 15 kph (NE 9.2 mph) | - | 10SM |
| | KCOS 060754Z AUTO 05008KT 10SM BKN055 BKN075 OVC095 M07/M14 A2981 RMK AO2 SLP123 T10671144 TSNO |