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Period of Record General Climate Summary - Growing Degree Days

Station:(047772) SAN FRAN MISSION DOLORE
From Year=1914 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 344 392 471 487 542 584 612 638 679 675 520 374 6318
40 S 344 735 1206 1692 2235 2819 3431 4069 4748 5423 5944 6318 6318
45 M 193 251 316 337 387 434 457 483 529 520 370 222 4500
45 S 193 444 760 1097 1484 1918 2376 2858 3387 3908 4278 4500 4500
50 M 70 119 166 188 232 284 302 328 379 365 221 90 2746
50 S 70 189 355 543 775 1060 1362 1690 2069 2434 2656 2746 2746
55 M 12 31 58 70 92 138 149 173 229 212 91 18 1271
55 S 12 43 100 170 262 399 548 722 951 1163 1253 1271 1271
60 M 1 4 14 20 27 42 39 51 98 86 22 1 405
60 S 1 5 19 39 66 108 147 198 296 382 404 405 405
Corn Growing Degree Days
50 M 109 148 192 206 239 284 302 327 375 364 234 123 2904
50 S 109 257 449 655 894 1178 1480 1807 2182 2547 2781 2904 2904
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