PALO ALTO, CALIFORNIA

Period of Record General Climate Summary - Heating Degree Days

Station:(046646) PALO ALTO
From Year=1953 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	529	389	350	260	153	59	23	21	46	154	345	529	2860
60	374	250	201	131	50	9	1	0	4	49	201	375	1645
57	283	171	122	70	17	2	0	0	1	17	125	284	1091
55	225	124	80	40	6	1	0	0	0	6	84	226	792
50	99	39	16	5	0	0	0	0	0	0	20	101	281

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