Historical weather data, all-time temperature records, and monthly climate averages for Florham Park, NJ. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Florham Park runs chilly, with an average high of just 57° and a low near 35° — firmly in late-winter-feels-like-spring territory. The date has seen wild swings over 94 years of records, from a balmy 79° in 1981 down to a brutal 12° in 1954. Rain is a coin-flip-adjacent possibility at 39%, but snow is essentially off the table at just 1%.
Florham Park doesn't mess around at the extremes — this location has hit 107° in the July 2010 heat wave and plunged to -26° during the brutal winter of February 1934, a swing of 133 degrees. Summer storms can be punishing too: a single day in August 1971 dropped 8.76 inches of rain, and a January 1961 snowstorm buried the area under 20 inches in one shot.
Florham Park peaks in mid-to-late July, when average highs sit around 86-87°, and bottoms out in mid-January at a raw 38°. Late July is also the wettest stretch of the year, averaging 1.36 inches per week — prime thunderstorm season. If you're planning a visit, May through June and September through October offer the most comfortable shoulder-season conditions, with highs in the 60s and 70s.