CHICAGO (CBS) — Temperatures dipped below freezing in Chicago for the first time this season overnight, and the first snowflakes began falling early Tuesday afternoon.

CBS 2 Meteorologist Megan Glaros reports, although it’s a bit early for measurable accumulations of snow, it’s not out of the realm of possibility, though most snow will melt quickly, with air temperatures back above freezing Tuesday afternoon.

The best chance of snow will be south of I-80, though falling snow was reported at both O’Hare International Airport and Midway International Airport early Tuesday afternoon. Light snow also was reported in Aurora, Naperville, and several other suburbs.

A freeze warning was in effect through 8 a.m. Tuesday, as temperatures dropped below freezing, with temperatures as low as 24 degrees in Aurora, 25 degrees in Joliet, and 26 degrees in Kankakee at 4:30 a.m.

The temperature also dropped to 30 degrees overnight at O’Hare International Airport, and 31 degrees at Midway International Airport.

Temperatures likely will drop below freezing again Tuesday night.