The book for May is Stormy Weather by Paulette Giles.

From Publishers Weekly
Jiles's eloquent, engaging sophomore novel celebrates four strong women
toughing out the Great Depression in the Texas dust bowl. As the book opens in
1927, Elizabeth Stoddard and husband Jack have three daughters: the pretty
Mayme, the tomboyish Jeanine and the writerly Bea. Jeanine, resented for being
daddy's favorite, soon becomes the novel's primary point of view. After the
disgraced Jack dies in 1937, the four Stoddard women move back to the 150-acre
homeplace on the Brazos River in Central Texas. Drought, hail and dust storms,
land-tax debts and grinding poverty make life a struggle; radio shows,
horse-racing, wildcat oil well speculation and stuttering news reporter friend
Milton Brown provide diversions. Jeanine falls in love with local rancher Ross
Everett; Mayme dates soldier Vernon. Visceral detail of the 1930s rancher life
and the hardscrabble setting add authenticity, particularly in the characters'
feel for horses. While forthright, some of the dialogue is less than
believable (as when Ross compliments Jeanine on her "furious bloody purple"
dress), but it serves the characters' greater-than-usual emotional bandwidth.
Jiles winds this gritty saga up on the eve of WWII with a patchwork quilt's
worth of hope. (May) 
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