SAN LUIS DAM, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(047846) SAN LUIS DAM
From Year=1963 To Year=2005
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 197 317 490 604 823 964 1173 1159 1009 802 441 210 8189
40 S 197 513 1004 1607 2430 3394 4568 5726 6735 7538 7979 8189 8189
45 M 85 181 336 454 668 814 1018 1004 859 647 294 93 6454
45 S 85 266 602 1056 1724 2538 3557 4560 5419 6067 6361 6454 6454
50 M 24 74 191 306 513 664 863 849 709 493 164 28 4878
50 S 24 98 289 595 1108 1773 2636 3485 4194 4686 4850 4878 4878
55 M 4 17 80 173 359 515 708 694 559 340 68 4 3521
55 S 4 21 100 274 633 1147 1856 2550 3108 3448 3516 3521 3521
60 M 0 1 22 78 219 366 553 539 409 197 17 0 2402
60 S 0 2 23 101 321 687 1240 1779 2188 2385 2402 2402 2402
Corn Growing Degree Days
50 M 82 151 252 339 502 615 756 754 657 492 225 92 4916
50 S 82 232 485 824 1325 1940 2696 3450 4106 4599 4824 4916 4916
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 Apr 5, 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