Delaware Experiences Warm and Dry Conditions During September 2014

Delaware’s climate was characterized by warm and dry conditions during September 2014.

Figure 1. Delaware Statewide mean September Temperature (°F) 1895-2014.
Figure 2. Delaware Statewide September Precipitation (inches) 1895-2014.

September Temperatures

Preliminary data indicates that the statewide average temperature in September was 69.3°F, 1.3°F above the 1981-2010 normal of 68.0°F (Figure 1) and the first month with above normal temperatures since June.

September Precipitation

Delaware’s statewide precipitation for September 2014 averaged 3.55 inches, 0.42 inches below the 1981-2010 mean (Figure 2). This was the 3rd September in a row to see below normal precipitation across the Delaware.

Statewide Spatial Averages

Data from the Delaware Environmental Observing System (DEOS) shows that September temperature anomalies across Delaware varied, depending upon location. Northern portions of the State and Chester County, PA experienced mostly above normal temperatures, while southern New Castle County and northern Kent County saw slightly below average temperatures (Figure 3).

Rainfall totals varied greatly across the region with generally higher values in southern Delaware and lower values across the north (Figure 4).

September 2014 average temperature anomalies
Figure 3. September 2014 average temperature departures from the 1981-2010 mean based upon DEOS station data.
September 2014 total precipitation
Figure 4. September 2014 precipitation based upon DEOS station data.

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Delaware Environmental Observing System
Delaware Geological Survey
UD College of Earth, Ocean, and Environment