NORTHWOOD, IOWA

Period of Record General Climate Summary - Heating Degree Days

Station:(136103) NORTHWOOD
From Year=1896 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	1571	1310	1047	572	243	53	9	27	173	485	946	1401	7837
60	1416	1169	892	431	139	17	1	5	89	345	796	1246	6546
57	1323	1084	800	352	91	8	0	1	54	268	707	1153	5842
55	1261	1028	739	302	67	4	0	0	37	223	648	1091	5399
50	1106	887	590	190	26	1	0	0	12	128	502	936	4378

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