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HOME > Expert Assessments > Degree Day Assessment
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Final heating degree day statistics
for the 2006-2007 season (November 2006 - March 2007)
National heating degree day statistical summary for the
2006-2007 season (November 2006 - March 2007, 5 pages, PDF format)
Final cooling degree day statistics
for the 2006 season (May - September 2006)
National total cooling degree day statistics
for the 2006 season (May - September 2006)
Final cooling degree day statistics
for the 2004 season (May - September 2004)
Final heating degree day statistics
for the 2003-2004 season (November 2003 - March 2004) [PDF version]
Final cooling degree day statistics
for the 2003 season (May - September 2003) [PDF version]
Chart comparing area- and population-weighted 48-state
average observed and normal CDD's for the 2003 season [PDF version]
Final heating degree day statistics
for the 2002/03 season (November 2002 - March 2003) [PDF version]
Chart comparing area- and population-weighted 48-state
average observed and normal HDD's for the 2002/03 season [PDF version]
Final cooling degree day statistics
for the 2002 season (May - September 2002)
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The CPC weekly Degree Day
Assessment discusses the Heating Degree Day (HDD) or Cooling Degree Day
(CDD) outlook for the coming week, and reviews temperature and degree day
statistics for the past week and the heating season (November - March) or
cooling season (May - September) to date. This Assessment can assist energy
managers in anticipating and analyzing fuel demand, because degree days
quantitatively reflect the public need for energy to heat and cool businesses
and dwellings.
For any individual day, degree
days indicate how far that day's average temperature departed from 65
degrees F. HDD's, which measure heating energy
demand, indicate how far the average temperature fell below 65 degrees F
(since cooler weather means more heating fuel demand). Similarly,
which measure cooling energy demand, indicate
how far the temperature averaged above 65 degrees F. In both cases, smaller
values represent less fuel demand, but values below 0 are set equal to 0,
because energy demand cannot be negative. Furthermore, since energy demand
is cumulative, degree day totals for periods exceeding 1 day are simply the
sum of each individual day's degree day total. For example, if some
location had a mean temperature of 60 degrees F on day 1 and 80 degrees F
on day 2, there would be 5 HDD's for day 1 (65
minus 60) and 0 for day 2 (65 minus 80, set to 0 since degree days cannot
be negative). For the day 1 + day 2 period, the
HDD total would be 5 + 0 = 5. In contrast, there would be 0
CDD's for day 1 (60 minus 65, reset to 0), 15
CDD's for day 2 (80 minus 65), resulting in a 2-day CDD
total of 0 + 15 = 15.
In this Assessment, degree day
and temperature statistics are based on areally-averaged
numbers for each of 102 climate regions of approximately equal area that
cover the contiguous 48 states.
[NOTE: HDD forecast statistics are
not available for some areas because of data problems. These are indicated
by gray shading on the maps showing U. S. Climate Region statistics. We are
investigating this problem and hope to have it resolved soon. The Climate
Prediction Center apologizes for any inconvenience this might cause.]
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Supplementary Information
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Outlook Maps, Graphs, and Tables
The CPC produces U.S. outlook maps for degree days, departures from normal,
and average temperature percentile; tables of population-weighted state,
regional, and national averages by state; and probability of exceedence graphs.
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U.S. Degree Day Outlook Maps by U.S.
Climate Regions Based on output statistics from the Medium Range Forecast Model (MRFMOS).
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State Degree Day Outlook Tables
Monitoring & Data
The CPC produces maps showing observed degree days, departures from normal, averaged temperature
percentile, and winter energy savings based on temperature; and provides station and regional data.
- Current Statistics (Observed) by State
Maps comparing forecast and observed degree day statistics
- September 24 - 30, 2008 CDD
- August 13 - 19, 2008 CDD
- August 6 - 12, 2008 CDD
- July 30 - August 5, 2008 CDD
- June 18 - 24, 2008 CDD
- June 11 - 17, 2008 CDD
- May 20 - 26, 2008 CDD
- March 26 - 31, 2008 HDD
- March 19 - 25, 2008 HDD
- March 12 - 18, 2008 HDD
- March 5 - 11, 2008 HDD
- February 27 - March 4, 2008 HDD
- February 20 - 26, 2008 HDD
- February 13 - 19, 2008 HDD
- February 6 - 12, 2008 HDD
- January 30 - February 5, 2008 HDD
- January 16 - 22, 2008 HDD
- January 9 - 15, 2008 HDD
- January 2 - 8, 2008 HDD
- December 26, 2007 - January 1, 2008 HDD
- December 19 - 25, 2007 HDD
- December 12 - 18, 2007 HDD
- December 5 - 11, 2007 HDD
- September 12 - 18, 2007 CDD
- September 5 - 11, 2007 CDD
- August 29 - September 4, 2007 CDD
- August 22 - 28, 2007 CDD
- August 15 - 21, 2007 CDD
- August 8 - 14, 2007 CDD
- August 1 - 7, 2007 CDD
- July 25 - 31, 2007 CDD
- July 11 - 17, 2007 CDD
- February 28 - March 6, 2007 HDD
- January 17 - 23, 2007 HDD
- January 10 - 16, 2007 HDD
- January 3 - 9, 2007 HDD
- Dec. 27, 2006 - Jan. 2, 2007 HDD
- December 13 - 19, 2006 HDD
- December 6 - 12, 2006 HDD
- November 29 - December 5, 2006 HDD
- November 22 - 28, 2006 HDD
- September 6 - 12, 2006 CDD
- August 30 - September 5, 2006 CDD
- August 16 - 22, 2006 CDD
- August 9 - 15, 2006 CDD
- May 31 - June 6, 2006 CDD
- May 24 - 30, 2006 CDD
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