HALF MOON BAY, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(043714) HALF MOON BAY
From Year=1939 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 329 322 366 379 451 498 559 587 573 529 419 344 5357
40 S 329 652 1018 1397 1848 2346 2905 3492 4065 4594 5013 5357 5357
45 M 181 184 212 229 296 348 404 432 423 374 269 194 3547
45 S 181 365 577 806 1102 1450 1855 2286 2709 3083 3353 3547 3547
50 M 67 68 79 90 144 198 249 277 273 220 129 73 1868
50 S 67 135 214 304 448 646 896 1172 1445 1666 1795 1868 1868
55 M 12 13 13 17 32 62 99 124 126 85 36 13 632
55 S 12 25 38 55 87 149 248 372 498 583 619 632 632
60 M 1 2 1 3 4 6 10 19 27 19 6 1 99
60 S 1 3 4 7 11 17 27 46 73 92 98 99 99
Corn Growing Degree Days
50 M 135 136 155 163 191 222 259 284 289 263 196 143 2436
50 S 135 270 425 588 779 1001 1260 1544 1833 2096 2293 2436 2436
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