Record Rainfall and Warm Temperatures Across Delaware in June 2013

Record rainfall and warmer than normal conditions characterized Delaware’s Climate during June 2013.

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Figure 1. Delaware statewide mean June temperature (°F) 1895-2013.
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Figure 2. Delaware statewide June precipitation (inches) 1895-2013.

June Temperatures

Preliminary data indicates that the statewide average temperature in June was 74° F. This is 1.6° F above the 1981-2010 normal of 72.4°F (Figure 1) and the 4th straight June with above normal temperatures.

June Precipitation

Delaware’s statewide precipitation for June 2013 averaged 10.94”, which is 7.08” above the 1981-2010 mean of 3.86” (Figure 2). The 10.94” that fell in June represents a new statewide rainfall record for the month. In addition, Wilmington set a new June precipitation record recording 13.66”.

Statewide Spatial Averages

Data from the Delaware Environmental Observing System (DEOS) shows that the average June temperature anomalies across Delaware were generally positive and small during the month (Figure 3).

Average maximum temperatures were below normal for much of the State except for southern Kent and northern Sussex counties and in the Wilmington area. Average minimum temperatures across the State were significantly above normal in central and western Sussex County and across most of Chester County, PA (Figures 4 and 5).

All stations in the DEOS network recorded much above normal rainfall values for June 2013. Areas with the greatest positive precipitation anomalies included south-central Sussex County and northern New Castle County. Many stations in northern New Castle County recorded rainfall anomalies of greater than 7” (Figure 6).

June 2013 average temperature departures from the 1981-2010 mean based upon DEOS station data
Figure 3. June 2013 average temperature departures from the 1981-2010 mean based upon DEOS station data.
Delaware June 2013 maximum temperature departures from the 1981-2010 mean based upon DEOS station data
Figure 4. June 2013 maximum temperature departures from the 1981-2010 mean based upon DEOS station data
Delaware June 2013 minimum temperature departures from the 1981-2010 mean based upon DEOS station data
Figure 5. June 2013 minimum temperature departures from the 1981-2010 mean based upon DEOS station data
Delaware June 2013 precipitation departures from the 1981-2010 mean based upon DEOS station data
Figure 6. June 2013 precipitation departures from the 1981-2010 mean based upon DEOS station data
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