ST MARYS, ALASKA

Period of Record General Climate Summary - Heating Degree Days

Station:(508105) ST MARYS
From Year=1967 To Year=2000
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	1743	1629	1530	1192	686	429	306	364	608	1079	1448	1818	12833
60	1588	1488	1375	1042	533	285	166	215	458	924	1298	1663	11037
57	1495	1403	1282	952	443	205	98	134	369	831	1208	1570	9991
55	1433	1347	1220	892	384	156	61	89	310	769	1148	1508	9318
50	1278	1206	1065	743	244	62	8	22	173	614	998	1353	7767

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