HETCH HETCHY, CALIFORNIA

Period of Record General Climate Summary - Heating Degree Days

Station:(043939) HETCH HETCHY
From Year=1931 To Year=2006
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	824	672	633	452	277	104	10	13	67	265	570	792	4679
60	669	531	478	310	160	43	1	2	25	146	421	637	3424
57	576	446	388	235	107	23	0	1	12	94	334	544	2760
55	514	391	330	190	80	14	0	0	7	68	278	482	2354
50	359	257	200	101	34	3	0	0	1	26	157	328	1465

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 Jul 28, 2006
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