Because the side of the earth you're on doesn't face the sun when it's night time.
Because in the daytime the earth is tilted to where it gets more direct sunlight, while in the night time the earth is tilted to where sunlight is not direct and it's turned away from the sun so the temperture lowers.
The earth's rotation results in daytime and nighttime.
The average is around 17 degrees Celsius during daytime. The average day and night temperature is -40°C.
The average daytime temperature on Earth is 59º F (15º C).
Mercury with a surface temperature of 700K in the daytime and 100K in the night
The average daytime surface temperature at the sun's surface is 9,941 degrees fahrenheit.
Because the rotation of the earth continues each day
It is normally between 60 to 70 degrees on a regular summer day.
the temperature in UK depends on which area of the United Kindom you are referring to but the temperature can vary between the following ; from minus 14 in the night to 6 degrees in the daytime in the north and from minus 8 degrees on average to 6 degrees in daytime although at various times it can stay at zero degrees C most of the day.
earth's rotation is responsible for this.
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Because of the rotation the earth faces the sun at daytime but when it rotates again it faces away which makes night.