NINETY NINE ISLANDS, SOUTH CAROLINA

Period of Record General Climate Summary - Heating Degree Days

From Year=1940 To Year=2012
Station:(386293) NINETY NINE ISLANDS
Averages Daily Extremes
Heating Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
65 801 645 470 230 66 4 0 0 24 211 468 734 3655
60 647 505 327 127 22 0 0 0 5 111 327 580 2652
57 556 422 249 81 9 0 0 0 1 68 251 491 2128
55 496 369 202 57 4 0 0 0 0 46 204 433 1812
50 354 246 107 17 0 0 0 0 0 13 107 296 1140
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 May 22,
Months with 5 or more missing days are not considered
Years with 1 or more missing months are not considered

Southeast Regional Climate Center, SERCC Webmaster