Historical weather data, all-time temperature records, and monthly climate averages for Germantown, PA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4 in Germantown lands right in the thick of spring's mood swings — average highs of 61° feel pleasant, but nearly half of all April 4ths have seen rain, and the date has swung from a frosty 32° low in 2013 to a shirt-sleeve 79° high back in 1999. No snow expected today, at least — that's one thing the calendar has going for it.
Germantown's weather has real range: the thermometer has hit a blistering 104° in July 1999 and bottomed out at a brutal -5° in January 1994, a swing of 109 degrees over just three decades of records. A single September day in 2004 dumped 7.5 inches of rain, and the Blizzard of '96 buried the area under 24 inches of snow in one shot.
Summer is the main event here — highs push into the low 90s in mid-July, and June through August stays firmly in the 80s and above. If you're avoiding heat, aim for the shoulder seasons: April climbs from the mid-50s to mid-60s and October holds steady in the upper 60s. July is both the hottest and wettest stretch of the year, averaging nearly 1.4 inches of rain in a single week.