Historical weather data, all-time temperature records, and monthly climate averages for Sparta, NJ. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Sparta sits right on the edge of spring, with an average high of 55° and a low that still dips to freezing at 32°. The date's range tells the whole story: 78° back in 1950, and a brutal 11° in 1954. Snow is almost off the table at just 1%, but don't put the jacket away yet.
Sparta's weather has real teeth at the extremes — 105° in July 1936 and -26° in January 1912 is a 131-degree swing between the worst of summer and winter. A single day in September 1894 dumped 7.76 inches of rain, and a February 1926 snowstorm buried the area under 27 inches.
Summer is the sweet spot, with highs peaking around 83-84° in mid-July — warm but not punishing. Winter settles in hard from late January through early February, when average highs barely crack 35°. If you're watching for rain, late summer (especially early August) is the wettest stretch of the year.