April 2025 – Warm with Near Normal Precipitation Across Delaware

April Temperatures

Preliminary data indicates that the statewide average temperature in April was 56.2^o F, which is 1.8^o F above the 1991-2020 mean value of 54.4^o F (Figure 1).  April 2025 was tied with April of 1985 as the 11^th warmest April on record since 1895. 

April Precipitation

Delaware’s statewide precipitation for April 2025 averaged 3.63 inches, 0.15 inches above the 1991-2020 mean of 3.48 inches (Figure 2).  April 2025 precipitation was in the “normal” range of all April precipitation totals since 1895.

Statewide Spatial Anomalies

Data from the Delaware Environmental Observing System (DEOS) show that temperature departures were uniformly positive across the entire State (Figure 3), with some stations reaching anomalies of over 3^o F in both Kent and Sussex Counties.  Precipitation was near normal across the state with the largest positive anomalies found across southern Sussex County (Figure 4).   

National Anomalies

Temperatures were above normal across the entire United States, except for the north-central portions of the country where temperatures were near normal (Figure 5). Large temperature anomalies of 5^o to 7^o F were found across parts of the Southeast.  Precipitation varied across the country (Figure 6) with much of the central portions of the country seeing large positive precipitation anomalies of over 4 inches.  The 500 hPa height pattern for April showed an anomalous jet stream ridge across much of the eastern United States and the Pacific Northwest associated with the warm temperatures in these regions (Figure 7).

Global Anomalies

April 2025 ranked as the second warmest April on record for the globe since 1850.  Global temperatures were 2.20^o F (1.22^o C)  above the 1901-2000 mean.  Particular warmth was found across central and far eastern Asia (Figure 8).

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