30 degrees Fahrenheit (ºF) are equal to -1.111 degrees Celsius (ºC):
30ºF = -1.111ºC
Calculation
The temperature T in degrees Celsius (ºC) is equal to 30 degrees Fahrenheit (ºF) minus 32 times 5/9:
T(ºC) = (30ºF - 32) × 5/9 = -1.111ºC