Frost/Freeze in Central Yampa River Basin, Colorado

As 10 of the 15 reporting stations available for verification in this zone reported temperatures at or below 32F for at least three hours, at least 50% of the zone was below freezing for the required length of time. However, only 3 of the 15 reported temperatures below 28F for at least 3 hours, marking this as a freeze but not a season-ending one. The minimum recorded temperature was 25F at the KCAG ASOS in Craig was 29F, with a range of 25-32F. Temperatures at or below 32F lasted on average for 3 hours, with a maximum of 7 hours and a minimum of 0 Temperatures at or below 28F lasted on average for 1 hour, with a maximum of 3 hours and a minimum of 0.

High pressure built over the western CONUS, bringing clear skies and calm winds to the region. Colder northwesterly flow supported lower temperatures in northwestern Colorado, resulting in a freeze for some areas, but not season ending.