ROCK RAPIDS, IOWA

Period of Record General Climate Summary - Cooling Degree Days

Station:(137147) ROCK RAPIDS
From Year=1893 To Year=2012
Cooling Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
55	0	0	3	38	181	412	578	502	243	54	1	0	2011
57	0	0	2	27	143	355	516	440	199	38	0	0	1720
60	0	0	1	15	96	273	424	350	141	21	0	0	1320
65	0	0	0	4	42	156	274	210	70	6	0	0	762
70	0	0	0	1	14	71	145	101	29	1	0	0	361

Cooling Degree Day units are computed as the difference between the daily average temperature and the base temperature. (Daily Ave. Temp. - Base Temp.) One unit is accumulated for each degree Fahrenheit the average temperature is above the base temperature. Negative numbers are discarded. Example: If the days high temperature was 95 and the low temperature was 51, the base 60 heating degree day units is ((95 + 51) / 2) - 60 = 13. 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