Historical weather data, all-time temperature records, and monthly climate averages for Chillum, MD. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Chillum sits right on the cusp of real spring, with an average high of 65° and a low of 41° — warm enough for a jacket, cool enough to remind you winter hasn't fully let go. History backs up that tension: this date has seen a balmy 85° back in 1963 and a bitter 25° low just two years later in 1965. There's nearly a coin-flip chance of rain, so keep an umbrella handy.
Chillum has seen the full extremes of Mid-Atlantic weather, swinging from a brutal -10° in January 1982 to a scorching 106° in July 2011 — a 116-degree range that tells you this place doesn't do mild by half. The wettest single day on record dumped 7.37 inches in June 2006, and a 1966 January snowstorm buried the area under 16 inches in one shot.
Summers are legitimately hot here — the warmest week of the year, mid-to-late July, averages a high of 90°, and June through August all push into the mid-to-upper 80s. If you prefer cooler weather, aim for mid-January through February, when highs hover in the low-to-mid 40s. July is also the wettest stretch of the year, averaging over an inch of precipitation in a single week, so summer travelers should expect afternoon storms.