Cooling Degree Days (Base 65 degrees, fahrenheit)

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Month 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001
Total 6,023 6,410 6,413 6,565 6,768 6,312 6,511 5,769 6,414 6,846 6,622
January 500 624 625 578 573 534 596 528 637 604 598
February 432 535 578 565 527 492 557 481 531 581 521
March 525 647 631 578 583 587 611 519 614 607 578
April 527 542 619 557 583 569 566 495 545 581 552
May 515 557 534 554 548 596 535 496 560 595 572
June 496 500 489 489 561 514 483 - 478 540 543
July 527 506 492 493 561 485 485 497 485 557 519
August 476 486 464 529 571 508 498 518 447 508 542
September 495 485 465 494 544 484 513 517 508 537 519
October 521 517 507 559 569 504 556 549 550 543 545
November 485 485 495 553 564 495 562 551 509 579 560
December 524 526 514 616 584 544 549 618 550 614 573

Note: A cooling degree day is a unit used to relate the day's temperature to the energy demands of air conditioning.Cooling degree days are calculated by subtracting 65 from a day's average temperature. For example, if the day's high is 90°F and the day's low is 70ºF, the day's average is 80ºF. Eighty minus 65 is 15 cooling degree days.Cooling degree days can be used to compare the current summer to past summers. It can also be used to compare the heat in one part of the country with another.

SOURCE: U.S. Department of Commerce, National Oceanic Atmospheric Administration, National Climatic Data Center; Local Climatological Data, Pago Pago, American Samoa