SPIRIT LAKE RS, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(457919) SPIRIT LAKE RANGER STN
From Year=1932 To Year=1956
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 1 0 4 37 116 252 558 552 382 166 23 3 2093
40 S 1 1 5 42 158 410 968 1520 1902 2068 2090 2093 2093
45 M 0 0 0 10 43 135 405 398 241 68 2 0 1303
45 S 0 0 0 11 54 189 594 992 1232 1300 1302 1303 1303
50 M 0 0 0 4 14 62 259 248 122 20 0 0 730
50 S 0 0 0 4 18 81 339 587 709 730 730 730 730
55 M 0 0 0 2 5 26 135 124 44 4 0 0 339
55 S 0 0 0 2 7 32 167 290 335 339 339 339 339
60 M 0 0 0 0 1 8 54 44 11 0 0 0 118
60 S 0 0 0 0 1 9 63 107 118 118 118 118 118
Corn Growing Degree Days
50 M 0 0 3 31 81 150 335 322 209 66 5 1 1202
50 S 0 0 3 34 115 265 600 921 1130 1197 1201 1202 1202
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