SAN MARCOS RCH, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(047861) SAN MARCOS RANCH
From Year=1952 To Year=1960
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 279 311 400 498 634 747 966 912 841 682 468 361 7100
40 S 279 591 991 1489 2123 2870 3836 4748 5589 6271 6739 7100 7100
45 M 148 181 248 349 479 597 811 757 691 527 321 216 5326
45 S 148 329 577 926 1405 2002 2813 3570 4261 4788 5109 5326 5326
50 M 56 83 121 209 326 447 656 602 541 373 190 99 3704
50 S 56 139 260 470 795 1242 1899 2500 3042 3414 3604 3704 3704
55 M 13 28 41 96 182 299 501 447 392 225 90 31 2345
55 S 13 41 82 178 360 659 1160 1607 1998 2224 2314 2345 2345
60 M 2 6 8 29 74 162 347 293 246 105 29 6 1304
60 S 2 7 15 44 118 279 626 919 1164 1269 1299 1304 1304
Corn Growing Degree Days
50 M 206 225 287 324 404 475 580 562 530 468 367 291 4719
50 S 206 431 718 1042 1446 1921 2501 3063 3593 4061 4428 4719 4719
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