Autumn 2014 Slightly Dry with Near Normal Temperatures Across Delaware

Near normal temperatures and slightly dry conditions characterized Delaware’s Climate during autumn 2014.

Figure 1. Delaware Statewide mean Autumn Temperature (°F) 1895-2014.
Figure 2. Delaware statewide temperature anomalies for January 2014 through November 2014.
Figure 3. Delaware Statewide mean Autumn Precipitation (°F) 1895-2014.
Figure 4. Delaware statewide precipitation anomalies for January 2014 through November 2014.

Autumn Temperatures

Preliminary data indicates that the statewide mean autumn temperature of 57.8°F was 0.2°F above the 1981-2010 normal of 57.6°F (Figure 1). The near normal autumn temperatures followed four consecutive seasons with below normal temperatures across Delaware. Temperatures have been quite variable across the State during the year (Figure 2), with seven of the first eleven months being below normal.

Autumn Precipitation

Near normal autumn temperatures were accompanied by slightly dry conditions across the state during the autumn season. The statewide mean precipitation of 9.52 inches was 1.31 inches below the 1981-2010 normal of 10.83 inches (Figure 3). Monthly precipitation anomalies have varied between positive and negative during the year, but no month has seen large departures from normal (Figure 4).

Statewide Spatial Averages

Data from the Delaware Environmental Observing System (DEOS) show that temperatures varied considerably across the State during the autumn season (Figure 5), with generally small positive or negative departures at most stations. The largest departures were found along the coastal areas of Sussex County where cool conditions were dominant.

Precipitation varied from as low as 7.51 inches along the Atlantic Coast to a high of 14.52 inches in western Chester County, PA. Even with this large variation, most stations in the region experienced slightly dry conditions during the season, with the greatest negative anomalies found along the Atlantic Coast and in northern Chester County, PA (Figure 6).

Autumn 2014 average temperature departures
Figure 5. Autumn 2014 average temperature departures from the 1981-2010 mean based upon DEOS station data.
Autumn 2014 precipitation departures
Figure 6. Autumn 2014 precipitation departures from the 1981-2010 mean based upon DEOS station data.
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Delaware Environmental Observing System
Delaware Geological Survey
UD College of Earth, Ocean, and Environment