How does earth’s tilt affect climate?

the smaller the tilt, the warmer the summer.

the smaller the tilt, the smaller the temperature difference is between summer and winter.

the larger the tilt, the warmer the summer.

the larger the tilt, the smaller the temperature difference is between summer and winter.

It depends on the angle of the earth's axial tilt which directly reflects the amount of solar irradiation received or not.

Explanation:

For example, If in Northern Hemisphere, there's no axial tilt then there will be no output of light energy from the entire disk of sun, hence no change in climate and if earth's tilt is 45 degree, then summers will be extremely hot because earth will be close to the sun and winters will be extremely cold because earth will be away from sun.