SAN MIGUEL ISLAND, wr

Period of Record General Climate Summary - Growing Degree Days

Station:(967803) SAN MIGUEL ISLAND
From Year=1981 To Year=2002
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 450 418 436 491 523 589 702 701 645 637 500 512 6601
40 S 450 868 1303 1794 2316 2905 3607 4308 4952 5590 6089 6601 6601
45 M 295 273 281 342 368 439 547 546 495 482 350 357 4772
45 S 295 568 848 1190 1557 1996 2543 3088 3583 4065 4415 4772 4772
50 M 140 128 130 194 213 289 392 391 345 327 200 203 2950
50 S 140 268 397 591 804 1092 1484 1875 2220 2547 2747 2950 2950
55 M 31 19 32 71 74 141 237 236 195 174 70 83 1363
55 S 31 50 82 153 226 368 605 840 1035 1210 1280 1363 1363
60 M 3 3 3 20 18 34 94 92 60 54 15 24 420
60 S 3 6 9 29 47 80 175 266 327 381 396 420 420
Corn Growing Degree Days
50 M 154 139 163 220 230 291 392 391 346 333 216 218 3094
50 S 154 293 456 676 906 1198 1590 1981 2327 2660 2877 3094 3094
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 Sep 17, 2007
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