hitterish
adj.— «“How many years did you hear that a lefty could never win at Fenway? It’s not true.” In July and August, when the air is conducive to what the late Ned Martin referred to as hitterish weather, the wind blows from the Southwest, toward The Wall.» —“Wild weather, no wild games” by Alan Greenwood Nashua Telegraph (New Hampshire) Apr. 14, 2007. (source: Double-Tongued Dictionary)
Further reading
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Cites for “hitterish” back to 1927 here, though this is the first I’ve seen the word applied to weather.