Total Wheat Growing Degree Days from May 15, 2008 to May 15, 1980
    ---------------------------------------------------w (M)
    |                         20          r 22               \ h 23
    |            23 b          b                 21 l    c 23
    |                 25 m                                  s 22
    |                25                      c 20             |
      26              b                                23 f   |   s 27
    |  w     h 27          m 24           b 23                 \  w 24
    |                      23 k                 21 c    (M)    |
  b 28                             19 h            m     n    g 24
    |      w 25                                   24            e 25         
   s 28                    22 t              c 22             m 23
    |                                                       24  h 24
    |                 21 h                         29 d     g    | p 26
    |                               21 r                    25 p |
    |                     23 m              22 j              30 f
    |b         d 26                                         (M) h|
    23                                 20 s                      \
    |                                                    (M) m    |
    |                         23 l          26 e            30 w  \
    |    b 21                       22 w                          |
    |          h 23                                 26 o           |
    ----------------------------------------------------------------
                                                          b 25