Warm and Wet Conditions Characterize the 2017 Summer Season Across Delaware

de_statewide_summer_temperature-1895-2017_clc_0.png
Figure 1. Delaware statewide mean summer temperature (°F) 1895-2017. Red line indicates 1981-2010 normal.
de_statewide_summer_precipitation_1895-2017_0.png
Figure 2. Delaware statewide summer precipitation (inches) 1895-2017. Red line indicates 1981-2010 normal.

Summer Temperatures

Preliminary data indicates that summer 2017 ranked as the 15th warmest summer season since records began in 1895 (tied with the 1995 and 2008 summer seasons). The statewide mean summer temperature of 75.3°F was 0.8°F above the 1981-2010 mean value of 74.5°F (Figure 1).

Summer Precipitation

The statewide mean precipitation of 18.24 inches was 6.24 inches above the 1981-2010 normal of 12.0 inches, and was the 12th wettest summer season since 1895, and the 5th year in a row with above normal summer precipitation (Figure 2).

Statewide Spatial Averages

Data from the Delaware Environmental Observing System (DEOS) show that summer temperature anomalies varied between positive and negative, depending upon location within Delaware and Chester County, PA (Figure 3). The Wilmington/New Castle County Airport recorded 16 days of temperatures greater than or equal to 90°F, very near the 1948 – 2017 normal of 17 days.

Summer precipitation was above normal across the entire State (Figure 4). However, the size of the positive anomalies varied greatly from one location to another. The variable pattern of precipitation is due to the small-scale nature of convective storms; dropping heavy precipitation in some areas, while leaving others relatively dry.

Summer 2017 average temperature departures (°F) from the 1981-2010 mean based upon DEOS station data.
Figure 3. Summer 2017 average temperature departures (°F) from the 1981-2010 mean based upon DEOS station data.
Summer 2017 precipitation departures (inches) from the 1981-2010 mean based upon DEOS station data.
Figure 4. Summer 2017 precipitation departures (inches) from the 1981-2010 mean based upon DEOS station data.
Syndicate content

Join CoCoRaHS

cocorahslogo.gif
Join CoCoRaHS, the Community Collaborative Rain, Hail and Snow Network, today!

Partners

odscpartnerlogo-cropped.png

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

NOAAProductsLink.gif

arsco.png
NOAA_WRN_Ambassador_0.jpg