SHASTA DAM, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(048135) SHASTA DAM
From Year=1948 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 186 255 379 541 805 1029 1292 1242 1040 775 391 212 8145
40 S 186 440 819 1360 2164 3193 4485 5727 6767 7542 7934 8145 8145
45 M 78 134 237 394 650 879 1137 1087 890 620 248 94 6448
45 S 78 212 449 843 1492 2371 3508 4595 5485 6106 6354 6448 6448
50 M 21 52 123 260 496 729 982 932 740 467 130 27 4960
50 S 21 74 197 457 953 1682 2664 3596 4336 4803 4932 4960 4960
55 M 4 14 51 149 351 579 827 777 590 321 53 5 3723
55 S 4 18 69 219 570 1150 1977 2754 3344 3665 3718 3723 3723
60 M 0 2 15 70 224 434 672 622 443 193 15 0 2691
60 S 0 2 17 87 311 745 1417 2039 2482 2675 2691 2691 2691
Corn Growing Degree Days
50 M 65 107 184 298 494 670 835 801 675 465 171 72 4837
50 S 65 172 356 653 1147 1817 2652 3453 4128 4593 4764 4837 4837
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