June 2024 – Continued Warm with Near Normal Precipitation

June Temperatures

Preliminary data indicates that the statewide average temperature in June was 75.0°F, which is 2.4°F above the 1991-2020 mean value of 72.6°F (Figure 1).  June’s temperature was the 5^th warmest since records began in 1895.   June was also the 7^th month in a row in which temperatures have been above normal in Delaware.

June Precipitation

Delaware’s statewide precipitation for June 2024 averaged 3.69 inches, 0.40 inches below the 1991-2020 mean of 4.09 inches (Figure 2).  June’s precipitation was in the “normal” range when compared to the last 130 years of observations.

Statewide Spatial Anomalies

Data from the Delaware Environmental Observing System (DEOS) show that temperature departures were positive across the entire state (Figure 3) with most locations seeing positive anomalies of between 1^o F  and 3^o F during the month.  Precipitation anomalies varied north-to-south across the state, with negative anomalies covering most of Kent and Sussex counties, and positive anomalies found across New Castle County (Figure 4).

National Anomalies

Temperatures were above normal across nearly the entire country with the largest positive anomalies of 7° to 9° F found across the desert southwest (Figure 5). Only the northcentral and northwestern tiers of the country saw near or below normal temperatures.  Precipitation departures varied across the country (Figure 6), as convective precipitation (thunderstorms) led to localized precipitation anomalies.  The 500 hPa height pattern for June showed a jet stream ridge across the southern two-thirds of the country (Figure 7) contributing to the higher temperatures across that region.

Global Anomalies

June 2024 ranked as the warmest June on record for the globe since 1850.  Global temperatures were 1.22° C (2.20° F) above the 1901-2000 mean.  Particular warmth was found across much of North America, South America, northern Africa and eastern Europe (Figure 8).

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