KETCHIKAN, ALASKA

Period of Record General Climate Summary - Heating Degree Days

Station:(504590) KETCHIKAN
From Year=1949 To Year=2012
Heating Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
65 969 808 837 660 499 321 220 209 342 580 765 905 7116
60 814 667 682 510 345 181 90 81 195 425 615 750 5355
57 721 582 589 420 256 105 35 29 114 332 526 657 4367
55 659 525 527 361 199 64 14 10 70 271 466 595 3760
50 504 384 372 215 78 7 0 1 11 129 317 440 2459
Heating Degree Day units are computed as the difference between the base temperature and the daily average temperature. (Base Temp. - Daily Ave. Temp.) One unit is accumulated for each degree Fahrenheit the average temperature is below the base temperature. Negative numbers are discarded. Example: If the days high temperature was 65 and the low temperature was 31, the base 50 heating degree day units is 50 - ((65 + 31) / 2) = 2. This is done for each day of the month and summed.
Table updated on Oct 31, 2012
Months with 5 or more missing days are not considered
Years with 1 or more missing months are not considered

Western Regional Climate Center, wrcc@dri.edu