PASADENA, CALIFORNIA

Period of Record General Climate Summary - Heating Degree Days

Station:(046719) PASADENA
From Year=1927 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	315	247	220	137	71	20	0	0	3	37	152	289	1491
60	178	128	100	50	15	2	0	0	0	6	58	153	690
57	110	72	50	21	4	0	0	0	0	1	25	88	372
55	73	45	28	10	1	0	0	0	0	0	13	55	226
50	20	10	4	1	0	0	0	0	0	0	1	12	49

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