EPHRATA, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(452609) EPHRATA
From Year=1903 To Year=1971
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 5 22 149 378 668 858 1125 1060 762 417 73 9 5524
40 S 5 27 175 553 1221 2079 3205 4264 5026 5443 5515 5524 5524
45 M 1 4 60 238 513 708 970 905 612 273 21 1 4306
45 S 1 5 65 303 816 1524 2494 3399 4011 4283 4305 4306 4306
50 M 0 0 18 126 362 558 815 750 463 153 3 0 3249
50 S 0 1 18 144 507 1065 1880 2630 3093 3246 3249 3249 3249
55 M 0 0 4 55 226 409 660 595 320 70 0 0 2338
55 S 0 0 4 58 284 693 1353 1948 2268 2338 2338 2338 2338
60 M 0 0 0 19 121 266 506 440 194 25 0 0 1571
60 S 0 0 0 20 140 406 911 1352 1546 1571 1571 1571 1571
Corn Growing Degree Days
50 M 2 10 90 232 412 543 723 684 478 240 34 4 3451
50 S 2 12 102 334 746 1289 2012 2696 3173 3414 3448 3451 3451
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