The possibility of snowfall in Pennsylvania during September

PENNSYLVANIA — While snowfall in Pennsylvania is typically associated with winter months, historical weather data indicates that snow has occasionally been recorded in September, though such events are extremely rare.

Historical Snowfall Data

According to the National Weather Service, the earliest recorded snowfall in Pittsburgh occurred on September 23, 1989, with a trace amount measured. This suggests that, under certain conditions, snowfall can occur in late September.

Climatic Factors

September in Pennsylvania is characterized by gradually decreasing temperatures as the state transitions from summer to fall.

Average daily high temperatures in September decrease from 79°F to 70°F in Pittsburgh and from 82°F to 72°F in Philadelphia.

These cooling temperatures, combined with specific atmospheric conditions, can occasionally lead to early-season snowfall, particularly in higher elevations.

Conclusion

While snowfall in Pennsylvania during September is exceedingly rare, historical data confirms that it is not entirely impossible. Such events are typically brief and involve minimal accumulation, often melting shortly after they occur.