Delaware Temperatures Continue Below Normal During April 2018

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Figure 1. Delaware statewide mean April temperature (°F) 1895-2018. Light gray line indicates 1981-2010 normal.
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Figure 2. National daily mean temperature anomalies for April
2018 (from the PRISM Climate Group, OSU).
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Figure 3. Delaware statewide April precipitation (inches) 1895-2018. Light gray line indicates 1981-2010 normal.

April Temperatures

Preliminary data indicates that the statewide average temperature in April was 51.1°F, which is 2.4°F below the 1981-2010 mean value of 53.5°F (Figure 1). April 2018 was the 39th coolest April since 1895 and was 8.4°F below temperatures during April 2017. The cool conditions across Delaware were consistent with temperature anomalies across the eastern two-thirds of the United States where temperatures were similarly below normal (Figure 2).

April Precipitation

Delaware’s statewide precipitation for April 2018 averaged 3.41 inches, 0.23 inches below the 1981-2010 mean (Figure 3). Even though precipitation has been slightly below normal the last two months, the year-to-date precipitation for 2018 is running in the top 33% of years since 1895.

Statewide Spatial Averages

Data from the Delaware Environmental Observing System (DEOS) show that temperature departures were below normal across the entire State (Figure 4), with anomalies as much as 4o F below the average at some stations. Precipitation was generally below normal across the State except for a few stations in central Sussex and southern Kent Counties(Figure 5). Most stations saw precipitation departures of one inch or less.

April 2018 average temperature departures (°F) from the 1981-2010 mean based upon DEOS station data.
Figure 4. April 2018 average temperature departures (°F) from the 1981-2010 mean based upon DEOS station data.
April 2018 precipitation departures (inches) from the 1981-2010 mean based upon DEOS station data.
Figure 5. April 2018 precipitation departures (inches) from the 1981-2010 mean based upon DEOS station data.
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