MODESTO, CALIFORNIA

Period of Record General Climate Summary - Heating Degree Days

Station:(045738) MODESTO
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	597	398	307	168	59	9	0	0	7	91	358	587	2582
60	442	259	166	70	14	1	0	0	0	26	215	432	1625
57	350	180	98	33	4	0	0	0	0	9	140	341	1156
55	291	133	63	18	1	0	0	0	0	4	98	281	889
50	155	47	13	2	0	0	0	0	0	1	29	146	392

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