18.8 degress
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Conversion: 66°F = 18 8/9 °C ≈ 18.89°C
16°C = 60.8°F
66 degrees Fahrenheit = 18.8888889 degrees Celsius
°F to °C: [°C] = ([°F] − 32) × 5⁄9°C to °F: [°F] = [°C] × 1.8 + 32
C to F: C=(5/9)(F-32) F to C: F=(9/5)C+32