Compare your Electric Bills to the last 5 years of DFW Weather
What are degree days?
Heating engineers who wanted a way to relate each day's temperatures to the demand for fuel to heat buildings developed the concept of heating degree days.
To calculate the heating degree days for a particular day, find the day's average temperature by adding the day's high and low temperatures and dividing by two. If the number is above 65, there are no heating degree days that day. If the number is less than 65, subtract it from 65 to find the number of heating degree days.
For example, if the day's high temperature is 60 and the low is 40, the average temperature is 50 degrees. 65 minus 50 is 15 heating degree days.
Cooling degree days are also based on the day's average minus 65. They relate the day's temperature to the energy demands of air conditioning. For example, if the day's high is 90 and the day's low is 70, the day's average is 80. 80 minus 65 is 15 cooling degree days.
Heating and cooling degree days can be used to relate how much more or less you might spend on heating or air conditioning if you move from one part of the country to another. Of course you'd have to take into account how well insulated your new home will be in comparison to your old one and the different costs of electricity, gas or heating oil. You could also use records of past heating degree days to see if the money you've spent on insulation, or a newer furnace or air conditioner is paying off. To do this, you'd also need records of past energy use.
DALLAS LOVE FIELD HEATING DEGREE DAYS ( HDD )
WINTER November December January February Four Month Total
2009 / 2010 161 665 613 623 2,062
2008 / 2009 225 539 528 259 1,551
2007 / 2008 205 498 593 341 1,637
2006 / 2007 224 446 683 424 1,777
2005 / 2006 184 506 281 412 1,383
FORT WORTH MEACHAM HEATING DEGREE DAYS ( HDD )
WINTER November December January February Four Month Total
2009 / 2010 195 710 656 629 2,190
2008 / 2009 260 577 559 288 1,684
2007 / 2008 240 560 636 388 1,824
2006 / 2007 253 477 720 453 1,903
2005 / 2006 203 534 308 444 1,489
ARLINGTON HEATING DEGREE DAYS ( HDD )
WINTER November December January February Four Month Total
2009 / 2010 170 594 566 620 1,950
2008 / 2009 253 542 540 259 1,594
2007 / 2008 217 523 615 364 1,719
2006 / 2007 235 461 689 429 1,814
2005 / 2006 206 521 299 425 1,451
McKINNEY HEATING DEGREE DAYS ( HDD )
WINTER November December January February Four Month Total
2009 / 2010 225 750 702 697 2,374
2008 / 2009 318 627 636 348 1,929
2007 / 2008 258 588 707 449 2,002
2006 / 2007 316 546 758 510 2,130
2005 / 2006 252 622 399 502 1,775
DENTON HEATING DEGREE DAYS ( HDD )
WINTER November December January February Four Month Total
2009 / 2010 231 755 645 697 2,328
2008 / 2009 305 635 643 322 1,905
2007 / 2008 233 588 689 422 1,932
2006 / 2007 289 486 746 490 2,011
2005 / 2006 252 595 383 490 1,720
If you wish to calculate your Heating Degree Days ( HDD ) so they match exactly to your Electric Billing Cycle, Click This Link and it will take you to the local National Weather Service's climate data. Follow these 4 simple steps after clicking the link. http://www.weather.gov/climate/index.php?wfo=fwd
1. Product » Select Preliminary Monthly Climate Data
2. Location » Select The location nearest your home
3. Timeframe » Select Archived Data:
4. View » Select The month and click Go!
