CONCORD WASTEWATER PLAN, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(041967) CONCORD WASTEWATER PLAN
From Year=1991 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 292 365 520 597 784 901 1016 1026 935 775 472 296 7980
40 S 292 657 1176 1773 2557 3458 4474 5500 6436 7211 7683 7980 7980
45 M 149 224 365 447 629 751 861 871 785 620 323 153 6179
45 S 149 373 738 1185 1814 2564 3426 4297 5082 5703 6026 6179 6179
50 M 45 99 214 297 474 601 706 716 635 465 183 52 4488
50 S 45 144 358 655 1129 1729 2436 3152 3787 4253 4436 4488 4488
55 M 6 23 90 160 319 451 551 561 485 311 74 11 3043
55 S 6 29 119 280 599 1049 1601 2162 2647 2958 3032 3043 3043
60 M 0 2 23 63 173 302 396 406 335 165 18 1 1886
60 S 0 2 25 88 262 563 960 1366 1701 1866 1885 1886 1886
Corn Growing Degree Days
50 M 120 171 275 334 468 564 650 658 595 468 247 129 4677
50 S 120 290 565 899 1367 1930 2580 3238 3833 4301 4548 4677 4677
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