Weather report

Please use the weather information below to better understand fluctuations in your heating and cooling costs.

The following report uses data collected at Sky Harbor International Airport in Phoenix by the National Oceanic and Atmospheric Administration (NOAA).

Summary for October 2009

Average high temperature    85
Average low temperature    57
Average daily temperature    74
Average dew point    32
Cooling degree hours (base 75°)    2,843
Heating degree hours (base 65°)    1,141
Cooling degree days (base 65°)    300
Heating degree days (base 65°)    26

Historical summary for October

  Cooling
degree
hours
(base 75°)		 Heating
degree
hours
(base 65°)
2009 2,843 1,141
2008 4,352 760
2007 4,043 128
10 year
average		 3,723 506

Monthly history
  2009 2008 2007 10 year avg.
Degree hours Heating Cooling Heating Cooling Heating Cooling Heating Cooling
January 5,990847,86409,32477,01351
February 4,7403016,0581124,5881005,010117
March 1,9188982,5301,0192,0961,7502,8331,013
April 1,3342,3717062,6267792,7238342,590
May 09,1585535,049287,861827,794
June 2010,121013,710013,334212,687
July 017,244014,735015,313015,735
August 015,153013,367015,136013,874
September 32510,696010,503010,4823210,475
October 1,1412,8437604,3521284,0435063,723
November 1166062,2337651,3631,4502,764635
December   7,77959,47407,1868
Year
total		 15,584 69,475 28,483 66,243 27,780 72,199 26,262 68,702

Monthly detail
Oct 2009
Sep 2009
Aug 2009
Jul 2009
Jun 2009
May 2009
Apr 2009
Mar 2009
Feb 2009
Jan 2009
Dec 2008
Nov 2008

Definitions
  • Degree hour: The difference between a base temperature of 65°F (heating), 75°F (cooling), and the average ambient air temperature for the hour. If the average ambient air temperature for the hour falls below 65°F the degree hour is recorded as a heating degree hour. A cooling degree hour is recorded if the average air temperature for the hour rises above 75°F.
  • Degree day: The difference between a base temperature of 65°F (heating and cooling) and the average ambient air temperature for the day. If the average ambient air temperature for the day falls below 65°F, the degree day is recorded as a heating degree day. A cooling degree day is recorded if the average air temperature for the day rises above 65°F.
  • Base 75: Used in calculating the degree hours based on an outside air temperature of 75°F.
  • Base 65: Used in calculating the degree hours based on an outside air temperature of 65°F.
  • Dew point: The temperature to which air must be cooled in order to reach saturation (assuming air pressure and moisture content are constant).

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