Growing degree days

Growing degree days (GDD) is a weather-based indicator for assessing crop development. It is a calculation used by crop producers that is a measure of heat accumulation used to predict plant and pest development rates such as the date that a crop reaches maturity.
Source: www.farmwest.com

Base temperature



°F

Growing season begins

Growing season ends

Calculation method




Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
2010/2011 71.7 275.6 543.1 852.0 966.3 880.6 666.9 271.1
2011/2012 38.2 286.6 565.7 788.9 996.1 829.5 614.4 247.0
2012/2013 203.9 196.2 630.6 748.4 1003.1 875.2 597.2 287.1
2013/2014 1.9 240.4 480.2 766.5 944.7 773.8 560.1 308.0
2014/2015 18.1 144.8 496.4 743.1 837.9 735.2 591.5 272.4
2015/2016 14.1 188.3 614.1 742.6 868.8 825.1 688.3 231.8
2016/2017 121.7 199.1 388.2 729.9 954.6 938.8 700.8 339.1
2017/2018 85.6 347.7 421.4 750.8 926.9 794.7 643.6 422.6
2018/2019 18.0 142.4 627.3 706.5 886.5 904.7 711.2 334.4
2019/2020 44.1 320.2 568.6 750.8 962.7 866.6 714.7 376.7
2020/2021 92.0 126.7 394.5 754.6 1002.0 889.0 575.2 312.3
2021/2022 106.7 247.2 458.2 789.0 949.2 944.9 667.4 468.9
2022/2023 91.8 176.6 530.3 755.3 953.4 926.0 627.1 195.9
2023/2024 37.7 317.9 429.2 658.7 902.6 786.5 667.3 351.2
2024/2025 88.8 281.6 558.0 859.1 1013.1 871.2 638.3 337.2
2025/2026 113.0 294.1 528.9 830.1 1030.0 763.5 678.1 295.1
2026/2027 139.5 338.2 488.8 799.2 892.7 926.6 204.7

Cumulative


 Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
2010/2011 71.7 347.3 890.4 1742.3 2708.6 3589.2 4256.0 4527.1
2011/2012 38.2 324.7 890.4 1679.2 2675.3 3504.8 4119.2 4366.2
2012/2013 203.9 400.1 1030.7 1779.1 2782.2 3657.3 4254.5 4541.6
2013/2014 1.9 242.3 722.5 1489.0 2433.6 3207.4 3767.5 4075.5
2014/2015 18.1 162.9 659.3 1402.4 2240.2 2975.4 3566.9 3839.3
2015/2016 14.1 202.4 816.5 1559.1 2427.9 3253.0 3941.3 4173.1
2016/2017 121.7 320.7 708.9 1438.8 2393.4 3332.2 4032.9 4372.0
2017/2018 85.6 433.3 854.7 1605.4 2532.3 3327.0 3970.6 4393.1
2018/2019 18.0 160.4 787.6 1494.1 2380.5 3285.2 3996.4 4330.8
2019/2020 44.1 364.2 932.8 1683.6 2646.2 3512.8 4227.4 4604.1
2020/2021 92.0 218.7 613.2 1367.7 2369.7 3258.7 3833.9 4146.2
2021/2022 106.7 353.8 812.0 1601.0 2550.2 3495.1 4162.5 4631.4
2022/2023 91.8 268.4 798.6 1553.9 2507.2 3433.2 4060.3 4256.2
2023/2024 37.7 355.6 784.8 1443.5 2346.1 3132.6 3799.9 4151.1
2024/2025 88.8 370.4 928.4 1787.4 2800.5 3671.6 4309.9 4647.0
2025/2026 113.0 407.1 935.9 1766.0 2796.0 3559.4 4237.5 4532.5
2026/2027 139.5 477.7 966.5 1765.6 2658.3 3584.8 3789.5

2010/2011
2011/2012
2012/2013
2013/2014
2014/2015
2015/2016
2016/2017
2017/2018
2018/2019
2019/2020
2020/2021
2021/2022
2022/2023
2023/2024
2024/2025
2025/2026
2026/2027
 avg
Mar 71.738.2203.91.918.114.1121.785.618.044.192.0106.791.837.788.8113.0139.5 75.7
Apr 275.6286.6196.2240.4144.8188.3199.1347.7142.4320.2126.7247.2176.6317.9281.6294.1338.2 242.5
May 543.1565.7630.6480.2496.4614.1388.2421.4627.3568.6394.5458.2530.3429.2558.0528.9488.8 513.1
Jun 852.0788.9748.4766.5743.1742.6729.9750.8706.5750.8754.6789.0755.3658.7859.1830.1799.2 766.2
Jul 966.3996.11003.1944.7837.9868.8954.6926.9886.5962.71002.0949.2953.4902.61013.11030.0892.7 946.5
Aug 880.6829.5875.2773.8735.2825.1938.8794.7904.7866.6889.0944.9926.0786.5871.2763.5926.6 854.8
Sep 666.9614.4597.2560.1591.5688.3700.8643.6711.2714.7575.2667.4627.1667.3638.3678.1204.7 620.4
Oct 271.1247.0287.1308.0272.4231.8339.1422.6334.4376.7312.3468.9195.9351.2337.2295.1 315.7

Cumulative

2010/2011
2011/2012
2012/2013
2013/2014
2014/2015
2015/2016
2016/2017
2017/2018
2018/2019
2019/2020
2020/2021
2021/2022
2022/2023
2023/2024
2024/2025
2025/2026
2026/2027
Mar 71.738.2203.91.918.114.1121.785.618.044.192.0106.791.837.788.8113.0139.5
Apr 347.3324.7400.1242.3162.9202.4320.7433.3160.4364.2218.7353.8268.4355.6370.4407.1477.7
May 890.4890.41030.7722.5659.3816.5708.9854.7787.6932.8613.2812.0798.6784.8928.4935.9966.5
Jun 1742.31679.21779.11489.01402.41559.11438.81605.41494.11683.61367.71601.01553.91443.51787.41766.01765.6
Jul 2708.62675.32782.22433.62240.22427.92393.42532.32380.52646.22369.72550.22507.22346.12800.52796.02658.3
Aug 3589.23504.83657.33207.42975.43253.03332.23327.03285.23512.83258.73495.13433.23132.63671.63559.43584.8
Sep 4256.04119.24254.53767.53566.93941.34032.93970.63996.44227.43833.94162.54060.33799.94309.94237.53789.5
Oct 4527.14366.24541.64075.53839.34173.14372.04393.14330.84604.14146.24631.44256.24151.14647.04532.5
4527.14366.24541.64075.53839.34173.14372.04393.14330.84604.14146.24631.44256.24151.14647.04532.53789.5












Month Day 2010/2011
2011/2012
2012/2013
2013/2014
2014/2015
2015/2016
2016/2017
2017/2018
2018/2019
2019/2020
2020/2021
2021/2022
2022/2023
2023/2024
2024/2025
2025/2026
2026/2027
 Avg
3 1 004.35000015.6000000000