Historical weather data, all-time temperature records, and monthly climate averages for St. Charles, MD. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in St. Charles sits right in the heart of spring's swing—a 65° average high sounds pleasant, but the date has served up everything from 86° heat in 1999 to a brutal 24° low back in 1992. There's nearly a coin-flip chance (44%) of rain, so keep a layer and an umbrella handy.
St. Charles earns its Mid-Atlantic stripes with a full spectrum of extremes: temperatures have soared to 103° in July 1980 and plunged to -9° in February 1996, a 112-degree spread. The region also takes a beating from late-summer storms—Hurricane Irene dropped a staggering 8.67 inches in a single day in August 2011.
Summer is the headliner here, with the week of July 16–22 averaging a steamy 88° high and the full season running from the low 80s in June through mid-80s in July and August. Winter is short but real, with January and February highs stuck in the mid-40s and the coolest stretch of the year landing mid-January at just 42°. If you want to dodge the rain, skip late September—it's the wettest week of the year, averaging 1.35 inches.