40 degrees fahrenheit is about 4.4 degrees celsius, while 10 celsius is 50 degrees fahrenheit so 40 fahrenheit is the colder temperature.
The formulas to convert between celsius and fahrenheit temperatures (where F is the Fahrenheit temperature and C is the Celsius temperature in degrees) are as follows:
Celsius to Fahrenheit: F = C × 9/5 + 32
Fahrenheit to Celsius: C = (F − 32) x 5/9
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10 degrees Celsius is colder than 45 degrees Fahrenheit.
-11 degrees Celsius is colder than -10 degrees Celsius.
The temperature of water is typically colder than the temperature of the air.
Humidity can make it feel colder when the temperature is below 70 degrees Fahrenheit.
To convert Celsius to Kelvin, you add 273.15 to the Celsius temperature. Therefore, -10°C is equal to 263.15 Kelvin.