MC NARY DAM, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(455231) MC NARY DAM
From Year=1954 To Year=2008
Heating Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
65 950 731 592 366 167 40 3 4 67 335 663 899 4815
60 795 590 437 223 70 8 0 0 18 197 513 744 3595
57 702 505 345 147 33 2 0 0 6 127 424 651 2942
55 640 448 284 103 17 1 0 0 3 89 365 589 2539
50 486 309 145 27 1 0 0 0 0 27 226 436 1658
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