June 2025 – Very Warm with Below Normal Precipitation Across Delaware

June Temperatures

Preliminary data indicates that the statewide average temperature in June was 75.1^o F, which is 2.5^o F above the 1991-2020 mean value of 72.6^o F (Figure 1).  June 2025 was the 5^th warmest June on record since 1895. 

June Precipitation

Delaware’s statewide precipitation for June 2025 averaged 2.64 inches, 1.45 inches below the 1991-2020 mean of 4.09 inches (Figure 2).  June 2025 ranked in the bottom one-third of June precipitation in the last 131 years.

Statewide Spatial Anomalies

Data from the Delaware Environmental Observing System (DEOS) show that temperature departures were positive across the entire State (Figure 3), with the largest temperature anomalies found across Sussex County.  Precipitation varied greatly across the State due to the convective nature of rainfall associated with thunderstorms (Figure 4).  However, most stations saw below normal precipitation for the month.   

National Anomalies

Temperatures were above normal across the entire United States except for some near normal values spread across the central portion of the country (Figure 5).  Precipitation varied across the country (Figure 6) with much of the eastern portions of the United States seeing positive precipitation anomalies while the northwest, and the coastal north Atlantic saw below normal precipitation during the month. The 500 hPa height pattern for June showed an anomalous jet stream ridge across much of the country, contributing to the generally positive temperature anomalies (Figure 7).

Global Anomalies

June 2025 ranked as the third warmest June on record for the globe since 1850.  Global temperatures were 1.76^o F (0.98^o C)  above the 1901-2000 mean.  Particular warmth was found across western Europe and central Asia while cooler than normal conditions were scattered across the Southern Hemisphere (Figure 8).

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