Celsius = (Fahrenheit-32) x 5/9 = (300-32) x 5/9 = 148.8889 degrees C 300 degrees Fahrenheit is 148.9 degrees Celsius. Climate scientists estimate that the average temperature on Earth would be colder by approximately 30 degrees Celsius (54 degrees Fahrenheit). With our existing mix of gases in the atmosphere the. All planets have very different temperatures at the surface. Mercury's Maximum Temperature 465°C (870°F) Mercury's Minimum Temperature -184°C (-300°F) Venus' Average Temperature 449°C (850°F. To convert Celsius to Fahrenheit, you can use the formula ( F = (C \times \frac 9 5 ) + 32 ). For 15 degrees Celsius, the conversion is ( F = (15 \times \frac 9 5 ) + 32 = 59 ) degrees. 300 degrees Celsius = 572 degrees Fahrenheit. 1 degree Celsius equals a change of 9/5 = 1.8 degrees Fahrenheit and 1 degree Fahrenheit equals a change of 5/9 = 0.555555555 degrees Celsius. With the unit in the off mode, depress the on/off switch and hold in until the c in the display switches to an f. It will now measure in Fahrenheit. 300 degrees Fahrenheit = 148.8 degrees Celsius. 300 degrees Fahrenheit = 148.8 degrees Celsius. -184 degrees celcius. You subtract 32 from -300, then divide that by 9. You then multiply that by 5.