Historical weather data, all-time temperature records, and monthly climate averages for Atco, NJ. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Atco sits right in the swing of spring — 123 years of data put the average high at 60° and the low at 37°, a classic in-between moment. But the date has seen wild swings: a balmy 81° back in 1913, and a bone-chilling 18° low in 1944. There's a 34% chance of rain today, though snow is essentially off the table at just 1%.
Atco has seen some serious extremes over its 125 years of records — from a scorching 107° on July 2, 1901, to a brutal -25° on February 9, 1934, a 132-degree spread between its worst moments. A single August storm in 1906 dumped 7.15 inches of rain in one day, and the February 2010 blizzard buried the area under 19 inches of snow.
Atco's warmest stretch runs mid-July, when average highs peak at 88°, while mid-January is the coldest window with highs barely reaching 41°. Summer is also the wettest season — early August averages 1.36 inches of precipitation in a single week. For the most comfortable visit, aim for May or September, when highs hover in the mid-to-upper 70s.