What is a Degree Day?

It's a standard weather calculation that compares how energy usage correlates to the outside temperature. The higher the number of degree days, the more the outside temperature is impacting your energy usage.

Degree days are based on how much the average daily outdoor temperature varies from the standard temperature of 65 degrees.

So, the colder or hotter the weather, the more degree days there will be. In general, energy bills increase or decrease fairly close to the same percentage that degree days increase or decrease.

Example:
High temperature of the day: 40 degrees
Low temperature of the day: 10 degrees
40 + 10 divided by 2 = 25
65-25 = 40 degree days

Month 2020 2019 2018 2017 2016 2015
January 610 766 886 545 850 839
February 576 443 450 392 600 914
March 326 494 446 375 304 443
April 245 180 306 187 201 163
May 237 304 334 228 225 238
June 384 369 450 344 436 391
July 568 515 523 516 549 504
August 461 482 476 401 522 386
September 255 469 383 235 348 283
October 186 252 325 260 156 187
November 559 551 422 333 297
December 518 610 758 689 378