Why is the Sun higher in summer?
The Earth's axis is tilted 23.4°, so through the year our hemisphere leans towards and then away from the Sun.
In summer your hemisphere leans towards the Sun: it climbs high, days are long and sunlight hits the ground steeply, heating it more.
In winter it leans away: the Sun stays low, days are short and sunlight arrives at a slant. It's the angle and the day length that make the seasons, not our distance from the Sun.