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Degree Days Analysis

The outside temperature plays a big role in how much it costs to heat or cool your home. To understand how the temperature affects your monthly heating and cooling costs you can use the standardized Degree Day Analysis when making comparisons from month to month.

Quite simply, Degree Day Analysis is the difference between the average outside temperature over a 24-hour period and a base temperature of 65 degrees. The higher the resulting number, the more energy your system will use to heat or cool your home.

For example, on December 8, 2005 the high temperature for the day was 27 degrees and the low temperature was 9 degrees, an average temperature of 18 degrees for that day. Using our base temperature of 65 we subtract 18 for a total of 47. Meaning, on December 8, 2005 there were 47 heating degree-days. On December 31, 2005 there were 20 heating degree-days. Remember the higher the number the more energy your heating system requires to heat your home. So in our above example it stands to reason that your heating system operated longer on December 8th than it did on December 31st, resulting in more electricity being used on December 8th. (Use the exact same formula to calculate cooling degree-days during summer months.)

To better illustrate this, you can look at monthly totals of heating degree-days as well. During the month of December 2005 there were a total of 949 heating degree-days, during the month of December 2004 there was a total of 811 heating degree-days. Given this information it would stand to reason that your heating system operated more in December 2005 than in December 2004 resulting in a higher electric bill for the month of December 2005.

It must be noted that other factors such as sun load or excessive infiltration due to high wind are not taken into consideration by the degree-day calculation. Additionally, things such as a home's insulation, the heating and cooling system efficiencies, thermostat settings, etc. also affect the amount of time that your heating and cooling systems will operate but Degree Day Analysis is a good standard of comparison for how hot or cold it was that month.

Below are links to information on the Degree Day Analysis for past months. This information will be updated monthly for your use.

Adobe Reader To view these forms you will need Adobe Reader. If you do not have it, you can download it here.









2014

January 

February 

March 

April 

May


2013

January

February

March 

April 

May 

June 

July 

August 

September 

October 

November 

December

2012

December

November

October

September

August

July

June

May

April

March

February

January 


2011

December

November

October

September

August

July

June

May

April

March
February
January

2010

December

November

October

September

August

July

June

May

April

March
February
January

2009

December
November
September
August
July
May
April
March
February
January

*October and June Not Available

2008

December
November
October
September
August
July
June
May
April
March
February
January

2007

December
November
October
September
August
July
June
May
April
March
February
January

Get more information on Degree Days by contacting us at 1-800-879-4056.