Monthly Summaries

When the headline for this monthly report alludes to hazy May skies that were frequently overhead, you know it was a quiet period weather-wise across the Garden State. Such was the case during the middle two weeks of May and at month’s end, with smoke from wildfires in western Canada frequently passing well overhead, followed by smoke from fires in Nova Scotia and a few in NJ. Otherwise, May temperatures were cooler than normal, and rainfall sparse.

The statewide average temperature of 59.3° was 1.9° below the 1991–2020 normal. This ranked as the 52nd coolest May since 1895. It was the coolest month compared to normal since January 2022. Following the third mildest April on record, May was only 4.0° milder than the previous month. This is the third smallest temperature difference on record between these two months. The average high temperature of 71.7° was 0.6° below normal, ranking 60th warmest and 68th coolest. The average low temperature of 46.9° was 3.3° below normal, ranking 26th coolest. The northern division averaged 57.8° (-2.1°, 50th coolest), the southern division 60.3° (-1.9°, 50th coolest), and the coastal division 59.6° (-1.4°, 63rd coolest).

While March temperatures came in above normal, they were not nearly as anomalously mild as those seen in January and February. This quelled concerns that an early blooming season might arise, one that could result in damaged vegetation had an early bloom been followed by an unseasonable cold spell. The average March temperature across NJ was 42.1°. This was 1.2° above the 1991–2020 normal and ranks as the 30th mildest March since 1895. The average maximum temperature of 52.2° was 1.3° above normal, ranking 37th mildest. The average minimum of 32.1° was 0.9° on the mild side, ranking 29th mildest. The National Centers for Environmental Information northern division averaged 39.8° (+1.0°, 31st mildest), the southern division 43.5° (+1.1°, 31st mildest), and the coastal division 43.7° (+1.5°, 23rd mildest).

Statewide, precipitation averaged 2.75”, which is 1.45” below normal and ranks 29th driest of the past 129 years. The northern coast and northeast were wettest and the southwest and far south driest. This was reflected in the northern division averaging 3.07” (-0.94”, 44th driest), southern 2.52” (-1.80”, 24th driest), and coast 2.84” (-1.58”, 30th driest).

March statewide average snowfall was 1.8”. This was 2.8” below normal and ranks as 49th least snowy. Northern counties averaged 5.4” (-1.8”, 56th least snowy), central counties 1.5” (-3.9”, 46th least snowy), and southern counties 0.0” (-2.7”, tied with 37 other years as least snowy).

January 2023 was unlike most any first month of the year a New Jersey resident has experienced. Temperatures were similar to those normally seen in March and accumulating snowfall was meager in the north and non-existent further south. NJ weather was more like that of the piedmont of North and South Carolina at this time of year. The statewide average temperature of 41.0° was 9.3° above the 1991–2020 normal and ties with 1932 as the mildest January since records commenced in 1895. The average high of 48.9° was 8.6° above normal, ranking 2nd mildest. The average low of 33.1° was 9.9° above normal, also ranking 2nd mildest. It is indeed impressive to see the January 2023 monthly mean 0.7° warmer than the normal monthly high temperature and the average low was 1.4° above the normal monthly mean. The NCEI northern division averaged 38.8° (+9.9°, rank #1), the southern division 42.3° (+8.9°, #2), and the coastal division 43.0° (+8.6°, #2).

January precipitation averaged 3.65” across NJ, which is 0.16” above normal and ranks as the 45th wettest on record. This includes rain that fell during the PM hours of December 31st, as the clock starts on the new month (and in this case, also the new year) once observations are gathered at most NWS Cooperative stations around 7–8 AM each morning (much as what occurred on November 30, 2022, contributing to December totals). The northern division was wettest, averaging 4.19” of rain and melted snowfall (+0.69”, 31st wettest), the southern division 3.36” (-0.11”, 56th wettest), and the coastal division 3.01” (-0.50”, 78th wettest/52nd driest).

Last month’s report spoke of how “classic” the weather was during October. November’s weather could be classified as being anything but such. The month began with perhaps the warmest first ten days of November on record in the Garden State, an interval that ranked up there with early November 2020. Then came winter-like temperatures for about ten days leading up to Thanksgiving before the month ended on a closer-to-normal note. There were only two mid-month events that brought more than an inch of rain to parts of the state, one associated with the remnants of a late-season hurricane that struck Florida. Portions of central and northern NJ saw the first snowflakes of the season during the cold spell, though aside from some minor accumulations at higher elevations, mostly traces were observed.

With the ups and downs of temperature, November came out averaging 47.5° for the state as a whole. This is 2.4° above the 1991–2020 normal and ties as the 15th mildest eleventh month on record. Ten of the twenty mildest Novembers since 1895 have occurred since 2001. The statewide average high temperature of 58.1° was 3.4° above normal, ranking 10th mildest. The average low of 36.9° was 1.4° above normal, ranking 20th mildest. North Jersey averaged 45.2° (+2.1, 15th mildest), south Jersey 48.7° (+2.4°, 17th mildest), and the Jersey coast 50.0° (+2.7°, 13th mildest).

Statewide precipitation averaged 3.08”, which is 0.28” below normal and ranks as the 63rd driest (66th wettest) on record. The north averaged 2.98” (-0.28”, 63rd driest), south 3.14” (-0.15”, 71st driest), and coast 3.14” (-0.20”, 68th driest). As the monthly map shows, central and northern coastal areas were wettest, while the driest areas were scattered in the far south, central, and north. It must be noted that the rain falling during the second half of the 30th is not included in the monthly totals for the state, regions, or individual stations presented later in the report. By convention, the reporting day for most National Weather Service (NWS) Cooperative and Community Collaborative Rain, Hail, and Snow Network (CoCoRaHS) stations used in this report ends at morning observation time on the last day of the month. Totals from the afternoon of the 30th, to be included in December totals, ranged as high as about an inch, though mainly 0.25”–1.00”.

Much like this past July, August was a hotter and drier month than normal. Despite a June with rather close-to-normal numbers, the two most recent months brought the summer temperature and precipitation to top-10 levels for hot and dry conditions. More on summer ’22 later in this report, but first to discuss is a record hot and quite dry August.

The August average temperature of 77.4° was 3.8° above the 1991–2020 normal, ranking as the hottest on record. Eight of the ten warmest Augusts since 1895 have occurred since 2001. The average maximum of 88.5° was 4.7° above normal, the hottest on record, while the average minimum of 66.2° was 2.9° above normal, tied for 5th warmest. North Jersey averaged 75.7° (+3.8°, warmest on record), the south 78.4° (+3.8°, warmest on record), and the coast 77.9° (+3.2°, 3rd warmest).

Statewide, August precipitation averaged 2.61”, which is 1.96” below normal, ranking as the 22nd driest. The north came in at 2.31” (-2.25”, 18th driest), south 2.82” (-1.75”, 29th driest), and coast 2.54” (-2.06”, 25th driest). As the map shows, virtually the entire state had a monthly total below the statewide 4.57” normal. Exceptions were found in isolated west central and central coastal areas where several storms quickly deposited hefty totals. Less than half the normal monthly rainfall fell in a good portion of the north and in scattered areas of the south and north coast.