December 2015: Extraordinary Warmth and Above Normal Precipitation Across Delaware

de_statewideDecTemp-1895-2015_0.png
Figure 1. Delaware statewide mean December temperature (°F) 1895-2015. Red line indicates 1981-2010 normal.
de_statewideDecPrecip-1895-2015_0.png
Figure 2. Delaware statewide December precipitation (inches) 1895-2015. Red line indicates 1981-2010 normal.

December Temperatures

Preliminary data indicates that the statewide average temperature in December was 50.5°F; this was 12.4°F above the 1981-2010 normal of 38.1°F (Figure 1), making December 2015 the warmest on record since 1895. This December was 6.1°F above the second warmest December on record that occurred in 2001. To put this in perspective, December 2015 was nearly 3.0°F above the November long-term average temperature and 6.0°F above the long-term average March temperature for the First State.

December Precipitation

Delaware’s statewide precipitation for December 2015 averaged 4.68 inches, 1.11 inches above the 1981-2010 mean (Figure 2). December 2015 saw no snowfall accumulations anywhere in the State.

Statewide Spatial Averages

Data from the Delaware Environmental Observing System (DEOS) shows the unprecedented warmth across all of Delaware and Chester County, PA (Figure 3). Several stations in northern New Castle County, DE and Chester County, PA saw anomalies between 13°F and 14°F above the 30-year normal for December.

Precipitation was above normal across the entire State, with the largest positive departures found across southern New Castle County (Figure 4).

December 2015 average temperature departures (°F) from the 1981-2010 mean based upon DEOS station data.
Figure 3. December 2015 average temperature departures (°F) from the 1981-2010 mean based upon DEOS station data.
December 2015 precipitation departures (inches) from the 1981-2010 mean based upon DEOS station data.
Figure 4. December 2015 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