This is not seriously a question :P Same reason it's warmer in the light than in the shade: The sun is out.
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During the day, the sun's rays heat up the earth's surface. This heat is then re-radiated back into the atmosphere, keeping the air warm. At night, without the sun's energy, the earth's surface cools down, leading to cooler temperatures in the air.
During the day, the sun's rays heat the Earth's surface, causing temperatures to rise. At night, there is no sunlight and the Earth's surface loses heat through radiation, which leads to cooler temperatures.
Humidity levels are typically higher at night because cooler air can hold less moisture than warm air. As the air cools at night, its ability to hold moisture decreases, which can result in higher relative humidity levels.
You may feel warmer at night compared to during the day because your body temperature naturally rises in the evening as part of your circadian rhythm, and your surroundings may also retain more heat at night. Additionally, your metabolism tends to slow down during sleep, which can make you feel warmer.
At night, it can feel hotter because the ground and buildings have absorbed heat during the day and release it slowly, raising the temperature. Additionally, there is less air movement at night, which can make it feel warmer.
The day becomes longer than the night during the spring equinox, which usually occurs around March 20th or 21st in the northern hemisphere. This is when the sun crosses the celestial equator and day and night are approximately equal in length. After the spring equinox, days start becoming longer than nights as we move towards summer.