Note the scale in inches at the bottom of the map.

September 2021 precipitation across New Jersey based on a PRISM (Oregon State University) analysis generated using NWS Cooperative and CoCoRaHS observations from 7 AM on August 31st to 7 AM on September 30th. The driest locations included Lower Township (Cape May) with 2.28”, Sea Isle City (Cape May) 2.47”, two stations in Egg Harbor City (Atlantic) 2.54” and 2.65”, Long Beach Township (Ocean) 2.88”, and Ocean City (Cape May) 2.98”.įigure 1. Excluding the rain on the 1st into the predawn hours of the 2nd, precipitation over the remainder of the month totaled 2.00”–3.00” across much of the state, with the northwest coming in with 4.00”–6.00”, except as much as 6.00”–8.00” in a good portion of Warren County (Figure 2).Īmong Rutgers NJ Weather Network (NJWxNet) stations and Community Collaborative Rain, Hail, and Snow Network (CoCoRaHS) stations, top monthly precipitation honors went to Pequest (Warren County) with 13.08”, followed by Hopewell Township (Mercer) 12.25”, three Hillsborough Township (Somerset) stations with 11.98”, 11.94”, and 11.77”, Bridgewater (Somerset) 11.83”, North Arlington (Bergen) 11.79”, Knowlton Township (Warren) 11.77”, Manville (Somerset) 11.59”, and Sandyston (Sussex) 11.44”. The northern half of the state was well above normal, and the southern half was drier the further south one headed until below-average monthly totals were seen in the southernmost counties. The 15 warmest Septembers across New Jersey since 1895.Ĭertainly, Ida’s rain had a lot to say about the distribution of September precipitation across New Jersey (Figure 1). The average low of 59.0° was 2.4° above normal and ranked 7th mildest. The statewide average high temperature in September was 78.4°, which was 1.2° above normal and the 21st warmest.

To exemplify how unusual this is, should 17-year intervals back to 1895 all have had thermal variability similar to one another, each would average two years in the top 15.

Nine of the 15 warmest Septembers since 1895 have occurred in the past 17 years. Along the coast, only 3.81” fell, some 0.08” below normal and ranking 44th wettest.Īs attention was paid to Ida recovery efforts and simply because of warm temperature conditions in many early falls this century, most might not have a sense that the average statewide September temperature of 68.8° was 1.9° above normal and ranked as the 11th warmest of the past 127 years (Table 1). The south averaged 4.61”, which was 0.62” above normal and ties as the 31st wettest. The north, where the bulk of Ida’s rain fell, averaged 8.92”, which was 4.46” above normal and ranks 7th wettest. This was 2.04” above the 1991–2020 normal and ranks as the 15th wettest September since 1895. All told, monthly precipitation averaged 6.20” across NJ. There were 29 other days of weather this month that fortunately were not as dramatic as Ida on the 1st. A separate report on Ida has been prepared and may be accessed here. Rainfall exceeding 3.00” per hour led to the most widespread flash flood event on record for the state, resulting in the tragic deaths of 30 individuals in central and northeastern locales. The storm delivered the most powerful tornado to strike the Garden State since 1990, demolishing multiple homes in Gloucester County. The title of this month’s report speaks to this momentous weather extreme that will forever be the defining event of this month and likely the entire year. Center for Environmental Prediction, School of Environmental and Biological Sciences/NJAES, Rutgers University

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