November 2025 – Cool and Very Dry Across Delaware

November Temperatures

Preliminary data indicates that the statewide average temperature in November was 47.0^o F, which is 0.5^o F below the 1991-2020 mean value of 47.5^o F (Figure 1).  November 2025 was the 82^nd warmest November in the last 131 years.  

November Precipitation

Delaware’s statewide precipitation for November 2025 averaged 1.61 inches, 1.66 inches below the 1991-2020 mean of 3.27 inches (Figure 2).  November 2025 was tied with November 1990 as the 26^th driest November since 1895.

Statewide Spatial Anomalies

Data from the Delaware Environmental Observing System (DEOS) show that temperatures were generally below normal across the entire State except for extreme northern Delaware (Figure 3). Precipitation was uniformly below normal, with the largest negative departures found across Kent and Sussex Counties (Figure 4).

National Anomalies

Temperatures were above normal across the western two-thirds of the country with positive anomalies reaching to between 7 – 9 ^o F across portions of the Rockies and much of Texas (Figure 5).  Precipitation was generally below normal in the eastern one-half of the nation, especially along the Gulf Coast.  Southern California, Arizona, and parts of Nevada saw above normal precipitation during the month (Figure 6).  The 500 hPa height pattern for November showed an anomalous jet stream ridge covering the western half of the United States (Figure 7) contributing to the temperature anomalies across the country.

Global Anomalies

November 2025 ranked as the third-warmest November on record for the globe since 1850.  Global temperatures were 2.12^o F (1.18^o C) above the 1901-2000 mean.  Particular warmth was found across much of the Arctic, central North America, and western Russia (Figure 8).

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