LEWISTON NEZ PERCE CO AP, IDAHO

Period of Record General Climate Summary - Heating Degree Days

Station:(105241) LEWISTON WSO AP
From Year=1948 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	978	748	646	428	224	71	7	11	99	409	727	945	5295
60	823	607	491	286	115	20	1	2	38	266	577	790	4016
57	730	522	399	208	66	7	0	0	18	188	487	697	3323
55	668	465	338	160	42	3	0	0	10	143	428	635	2894
50	514	326	197	64	9	0	0	0	2	58	284	481	1935

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