CALISTOGA, CALIFORNIA

Period of Record General Climate Summary - Heating Degree Days

Station:(041312) CALISTOGA
From Year=1906 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	528	396	336	239	126	29	2	2	18	109	342	546	2673
60	374	258	193	118	42	5	0	0	2	35	203	391	1622
57	283	182	121	64	16	1	0	0	1	14	132	300	1114
55	224	137	82	39	7	1	0	0	0	7	93	241	830
50	98	53	21	7	0	0	0	0	0	0	30	114	324

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