LEWISTON WATER PLANT, IDAHO

Period of Record General Climate Summary - Heating Degree Days

Station:(105236) LEWISTON WATER PLANT
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
65 979 757 629 349 160 53 3 4 81 360 701 882 4958
60 824 616 475 211 68 12 0 1 29 217 551 727 3729
57 731 532 382 140 34 3 0 0 14 144 461 634 3075
55 669 476 322 99 20 1 0 0 8 105 401 572 2673
50 514 335 185 31 3 0 0 0 1 40 257 417 1784
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