HEADWORKS PORTLAND W, OREGON

Period of Record General Climate Summary - Heating Degree Days

Station:(353770) HEADWORKS PTLD WTR BUR
From Year=1899 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
65 827 669 628 469 320 174 65 65 155 369 608 789 5140
60 672 528 473 323 185 71 12 12 60 224 458 634 3653
57 579 443 381 240 117 31 3 3 26 147 369 541 2881
55 517 387 320 188 79 16 1 1 14 104 310 479 2416
50 363 249 180 80 20 1 0 0 2 32 172 325 1423
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