Historical weather data, all-time temperature records, and monthly climate averages for Hillsdale, NJ. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5 in Hillsdale sits in that classic in-between stretch — expect a high near 57° and a low around 39°, with just a 27% chance of rain. The date has seen wild swings over 55 years of records, from a balmy 81° in 2010 to a frigid 23° low back in 1995.
Hillsdale earns its stripes as a true four-season town — the thermometer has swung from a brutal -7° in January 1984 all the way up to 104° in July 2011. Tropical remnants have also left their mark, with a staggering 8.18 inches of rain falling in a single day in September 1999.
Summer is the main event here, with highs peaking around 88° in late July and the wettest stretch of the year arriving right on its heels. Winters are genuinely cold — January and February average highs in the upper 30s to low 40s — so plan layers for anything outside peak summer. Spring and fall offer a comfortable middle ground, with April and October both averaging highs in the low-to-mid 60s.