ONJSC's Top 10 NJ Weather and Climate Events of 2025
For the 17th consecutive year, we in the state climate office have evaluated the myriad daily, monthly, and annual observations gathered across New Jersey during the course of the year to choose what we feel were the most significant and impactful 10 weather and climate events of 2025. More about each event can be found in the monthly narratives posted on our website. You might be tempted to rearrange the rankings, particularly as some of the events on the list may have affected you more than others ranked higher. Or perhaps you best recall one that didn't make the list.
Warm Evenings in New Jersey
Daily temperatures naturally fluctuate from week-to week and year-to-year (factoring out the seasonal “march” of temperature). Thus when temperature trends emerge over decades, it sparks a special interest here in the Office of the New Jersey State Climatologist. We are in the midst of a project to examine prolonged heat episodes throughout the state and have found some evidence for recent increases in such events. As impressive winter cold slowly comes to an end in NJ is there a better time to present some of our heat results? Of course not!
Heat Events in New Brunswick: A Climatological Analysis
The summertime in New Jersey is characterized by warm temperatures that give some relief from cold and dreary wintertime conditions. However, amongst pleasant summer days, the atmosphere can align in a way that makes the heat on other days rather unbearable — something that we commonly refer to as a heat wave. Heat waves have a large impact on public health, utilities, infrastructure and more, which is why we often hear the media discussing heat waves across the nation.
No escaping a sultry, sweaty heat wave
Garden State residents suffered through another heat wave last week, and at times it seemed like the unrelenting heat would never subside. A heat wave is unofficially defined as three or more consecutive days with the maximum temperature at or over 90°. This heat wave lasted seven days for many areas and furthermore, very high dew points (a measure of moisture in the air) made the heat index soar above 105°.A manageable heat wave to end May
A week after the unofficial start of summer many areas saw temperatures soar, giving the Garden State its first heat wave of the season (a heat wave is defined as a hot period having at least three consecutive days of 90°+ temperatures), temperatures steadily rose throughout the period from May 29 to May 31, with most areas away from the shoreline getting into the low to mid 90’s.