Historical weather data, all-time temperature records, and monthly climate averages for Saint Charles, MD. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Saint Charles tends to land right in the sweet spot of spring, with average highs of 65° and lows of 41°. The date has a wild range, though — it's hit as warm as 86° back in 2011 and dipped to a frosty 26° in 2013. There's about a 1-in-3 chance of rain, but snow is essentially off the table.
Saint Charles has seen genuine extremes over its nearly century-long record, from a brutal 103° in July 1980 to a bone-chilling -9° in February 1996. The wettest single day was a staggering 8.67 inches on August 28, 2011 — courtesy of Hurricane Irene — and a 21-inch snowstorm in February 1979 still holds the single-day snow record.
Summer is the main event here, with the week of July 16–22 averaging highs of 88° and the full July average reaching 86°. Winter is cold but not brutal, with the coolest stretch in mid-January averaging just 42°. If you're trying to stay dry, avoid late September — it's the wettest week of the year, averaging 1.35 inches of rain.