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Amazon has La Crosse 104-1522 8" Round Dial Thermometer for $ 10.10. Shipping is free with Prime or on orders of $ 25+.

Large, concise indoor/outdoor dial thermometer encompassed in a durable, weather resistant plastic frame. Wall mountable with the ability to read temperatures as low as -60 F. Red temperature indication Arrow provides accurate weather straight from your backyard.

Easy-to-read temperature scale (F)
Mount indoors or outdoors
Hang on long nail or screw (not included)
Weatherproof Thermometer