NAPA STATE HOSPITAL, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(046074) NAPA STATE HOSPITAL
From Year=1893 To Year=2012
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 241 316 419 500 654 768 856 850 803 687 428 258 6779
40 S 241 557 976 1476 2130 2898 3754 4604 5407 6093 6521 6779 6779
45 M 112 181 266 350 499 618 701 695 653 532 280 125 5012
45 S 112 293 560 910 1409 2026 2727 3423 4075 4607 4887 5012 5012
50 M 33 73 133 206 344 468 546 540 503 377 147 40 3410
50 S 33 106 239 445 789 1256 1802 2343 2846 3223 3370 3410 3410
55 M 5 16 46 90 196 318 391 386 353 227 53 7 2087
55 S 5 21 67 157 353 670 1061 1447 1800 2027 2080 2087 2087
60 M 0 2 10 29 82 176 237 231 207 102 11 1 1088
60 S 0 2 12 41 123 299 535 767 974 1076 1088 1088 1088
Corn Growing Degree Days
50 M 115 167 237 299 389 463 528 526 489 419 246 126 4004
50 S 115 282 519 818 1207 1670 2198 2724 3213 3632 3879 4004 4004
M = Monthly Data
S - Running sum of monthly data.
Growing 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.
Corn Growing Degree Day units have the limitations that the maximum daily temperatures greater than 86 F are set to 86 F and minimums less than 50 F are set to 50 F.
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