NAPA STATE HOSPITAL, CALIFORNIA

Period of Record General Climate Summary - Heating Degree Days

Station:(046074) NAPA STATE HOSPITAL
From Year=1893 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	537	391	358	257	149	56	19	20	39	120	324	521	2791
60	383	252	211	129	48	8	1	1	5	35	184	366	1622
57	291	172	134	69	17	1	0	0	1	13	113	275	1087
55	232	125	92	40	7	0	0	0	0	6	75	218	795
50	105	41	24	6	0	0	0	0	0	1	19	96	291

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