RITZVILLE, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(457059) RITZVILLE
From Year=1948 To Year=2006
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 17 78 222 458 665 912 892 624 288 42 6 4209
40 S 5 22 100 322 780 1444 2357 3249 3873 4161 4204 4209 4209
45 M 1 3 22 112 310 515 757 737 475 163 11 1 3106
45 S 1 3 26 138 447 962 1719 2457 2932 3095 3105 3106 3106
50 M 0 0 4 47 183 367 602 582 332 77 2 0 2196
50 S 0 0 5 52 235 602 1204 1786 2118 2195 2196 2196 2196
55 M 0 0 0 15 93 232 448 429 206 30 0 0 1453
55 S 0 0 0 15 108 340 788 1217 1423 1453 1453 1453 1453
60 M 0 0 0 4 39 126 301 282 110 8 0 0 870
60 S 0 0 0 4 43 169 470 752 862 870 870 870 870
Corn Growing Degree Days
50 M 1 9 55 160 300 419 565 554 400 195 20 1 2677
50 S 1 10 64 224 524 943 1508 2062 2461 2656 2676 2677 2677
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 Jul 28, 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