ARIEL DAM, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(450242) ARIEL DAM
From Year=1930 To Year=1971
Heating Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
65 785 -99 -99 394 303 150 86 -99 128 385 661 745 -99
60 630 -99 -99 247 169 58 23 -99 54 250 511 590 -99
57 537 -99 -99 166 106 23 3 -99 27 187 421 497 -99
55 475 -99 -99 115 70 11 0 -99 16 147 361 435 -99
50 320 -99 -99 28 18 0 0 -99 6 62 212 293 -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