NAPA STATE HOSPITAL, CALIFORNIA

Period of Record General Climate Summary - Heating Degree Days

Station:(046074) NAPA STATE HOSPITAL
From Year=1917 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
65 536 389 353 258 152 57 20 21 39 122 324 519 2788
60 381 249 207 129 50 9 1 1 5 37 184 364 1616
57 290 170 130 69 18 1 0 0 1 14 114 273 1080
55 231 123 88 40 7 0 0 0 0 6 76 216 789
50 105 39 22 6 0 0 0 0 0 1 19 96 289
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