Snowfall was officially recorded July 14 in Philadelphia even as we navigate a heatwave with temperatures approaching 100 degrees, writes Chloe Mayer for Newsweek.

The National Weather Service in Mount Holly, New Jersey described it as a “trace” of snow from some small hailstones that fell over Philadelphia International Airport Sunday afternoon during thunderstorms.

“Since hail is frozen precipitation, this counts as a ‘trace’ of snow in our climate reports,” meteorologists said in a post on X.  “Hence, the record daily snowfall report.”

The National Weather Service post included a screengrab of their official report, which showed that a “record daily maximum snowfall [was] set at Philadelphia, PA … A record snowfall of a trace was set at Philadelphia PA yesterday This breaks the old record of 0.0 inches set in 1870,” the official report stated.

According to the NWS, summer snow traces are “rare,” but not unheard of.

Traces of snow have been recorded 14 times in Philadelphia since 1911. Traces were reported four times in June in that time period, five times in July, and five times in August.

Though the National Weather Service stands by its snow classification, several X users argued that hail is not snow.

Read more about this unusual weather report in Newsweek.