LEWISTON WATER PLANT, IDAHO

Period of Record General Climate Summary - Cooling Degree Days

Station:(105236) LEWISTON WATER PLANT
From Year=1894 To Year=1955
Cooling Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
55	0	0	3	53	209	359	648	602	316	58	0	0	2249
57	0	0	1	34	161	301	586	541	262	35	0	0	1921
60	0	0	0	15	101	220	493	448	187	14	0	0	1479
65	0	0	0	3	39	111	341	296	89	3	0	0	882
70	0	0	0	0	12	43	201	160	33	0	0	0	448

Cooling Degree Day units are computed as the difference between the daily average temperature and the base temperature. (Daily Ave. Temp. - Base Temp.) One unit is accumulated for each degree Fahrenheit the average temperature is above the base temperature. Negative numbers are discarded. Example: If the days high temperature was 95 and the low temperature was 51, the base 60 heating degree day units is ((95 + 51) / 2) - 60 = 13. 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