PASADENA, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(046719) PASADENA
From Year=1893 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 451 450 555 632 751 862 1060 1077 984 836 615 471 8745
40 S 451 901 1457 2089 2840 3702 4761 5838 6822 7658 8274 8745 8745
45 M 300 310 401 482 596 712 905 922 834 681 466 318 6927
45 S 300 611 1011 1493 2090 2801 3706 4628 5462 6143 6609 6927 6927
50 M 165 180 251 333 441 562 750 767 684 526 317 177 5154
50 S 165 345 596 930 1371 1933 2682 3450 4133 4660 4977 5154 5154
55 M 68 80 125 195 288 412 595 612 534 372 181 73 3533
55 S 68 148 273 468 756 1168 1762 2374 2908 3280 3461 3533 3533
60 M 21 27 46 90 151 264 440 457 384 226 79 19 2204
60 S 21 48 94 184 335 599 1038 1495 1879 2105 2184 2204 2204
Corn Growing Degree Days
50 M 261 256 317 366 448 543 694 701 627 516 371 271 5372
50 S 261 517 834 1200 1648 2191 2885 3587 4213 4729 5100 5372 5372
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