INDEX 1 SSE, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(453909) INDEX
From Year=1894 To Year=1955
Heating Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
65 881 600 614 331 -99 -99 -99 -99 -99 -99 567 804 -99
60 726 460 459 206 -99 -99 -99 -99 -99 -99 417 649 -99
57 633 376 366 146 -99 -99 -99 -99 -99 -99 327 556 -99
55 571 320 305 114 -99 -99 -99 -99 -99 -99 267 494 -99
50 416 184 169 44 -99 -99 -99 -99 -99 -99 134 339 -99
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