ICE HARBOR DAM, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(453883) ICE HARBOR DAM
From Year=1957 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
65 952 726 583 369 174 42 3 5 73 351 664 927 4868
60 797 584 429 228 74 8 0 0 22 213 514 772 3641
57 704 500 337 152 36 2 0 0 9 143 426 679 2987
55 642 444 278 108 19 1 0 0 5 103 368 617 2583
50 489 306 144 32 2 0 0 0 1 35 231 465 1704
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