Delaware Experiences Cool Temperatures and Above Normal Rainfall During August 2013

Cooler than normal temperatures and above normal rainfall characterized Delaware’s Climate during August 2013.

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

August Temperatures

Preliminary data indicates that the statewide average temperature in August was 74.5°F. This is 0.8° F below the 1981-2010 normal of 75.3°F (Figure 1) and marks the second month this year with below normal temperatures (March also had below normal temperature).

August Precipitation

Delaware’s statewide precipitation for August 2013 averaged 4.94”, which is 0.69” above the 1981-2010 mean of 4.25” (Figure 2). Rainfall totals varied across the state ranging from nearly 8” in portions of Sussex County to less than 4” across central portions of Kent County.

Statewide Spatial Averages

Data from the Delaware Environmental Observing System (DEOS) shows that average August temperatures across Delaware were below normal throughout the entire state with eastern Sussex County and Kent County recording the largest negative anomalies (Figure 3). In general, the magnitude of the cooler than normal conditions increased moving from north to south through Delaware.

Average maximum temperatures were far below normal for nearly the entire state, while minimum temperatures were cooler than normal in most locations, except across portions of western Sussex County and Chester County, PA where some stations actually recorded warmer than normal minimum temperatures.

Precipitation was above normal across most of the State except for a large area of below normal precipitation in Kent County and far western Sussex County (Figure 6).

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