Arizona — The cold bites early across the high country as Flagstaff wakes under clear skies and starlight. Thermometers hover near 21 degrees, and frost coats cars, sidewalks, and rooftops. The air feels sharp, still, and unmistakably wintry.
This morning’s hard freeze poses the biggest impact. Exposed pipes, plants, and pets remain at risk before sunrise. Roads stay dry, but shaded spots can feel slick and brittle. Drivers should watch bridges and elevated roadways, especially along I-40 and Route 89.
Sunshine quickly changes the story. By midday, temperatures climb steadily, reaching the upper 50s this afternoon. Winds stay light, helping melt frost and dry pavement. For now, travel conditions remain favorable once the sun is fully up.
Tonight turns cold again, though slightly less intense. Lows settle near 28 degrees, keeping frost potential in play. Simple steps still matter. Cover outdoor plants and allow extra time warming vehicles early Wednesday.
Wednesday brings another classic December pattern. Bright sun dominates, and highs rebound to 62 degrees. A light breeze develops, but conditions stay calm overall. By evening, temperatures dip back into the upper 20s, continuing the freeze-thaw cycle.
Thursday, December 18th, stays mostly sunny and mild for mid-December. Highs again reach the low 60s, signaling a quiet winter stretch across northern Arizona. No snow or precipitation appears in the short-term outlook.
Friday and the weekend preview remain dry and seasonable. Daytime temperatures hover near 62 degrees, while nights cool into the low 30s. Meteorologists describe this as a stable winter ridge pattern.
Still, December nights don’t forgive mistakes. Flash freezing can occur after sunset where daytime melt refreezes. Plan morning travel carefully and stay winter-ready.
How cold did it feel where you stepped outside this morning?
📅 Five-Day Outlook — Flagstaff, AZ
- Today: Sunny, high near 59°, hard freeze early
- Wednesday: Sunny, high near 62°
- Thursday: Sunny, high near 62°
- Friday: Sunny, high near 62°
- Saturday: Mostly sunny, high near 59°
