Pete, I found a house near Jacksonville on Hwy 67/167 last summer that had huge groves of bananas. I decided to search for it on Google Maps, and I found it! I didn't have a chance to talk to the owner last year, but it would be cool to get some more information this spring. He has more bananas now than what's showing on the map. Check it out!
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Austin
Arkansas River Valley

Average January Low: 31°F, Average August High: 92°F
Extreme Winter Lows: 5-15°F, Extreme Summer Highs: 100-112°F, Annual Precipitation: 52 inches