In the northern hemisphere, the longest day of the year normally occurs in the:

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Second half of the month of June The longest day of the year in the Northern Hemisphere occurs on the Summer Solstice, which typically falls on June 21st—placing it in the second half of the month of June. Thematic Discussion: Earth's Tilt and the Summer Solstice The Mechanics of the Earth's Tilt: Most fundamentally, the Earth does not sit perfectly straight up and down. Its axis of rotation is tilted at an angle of 66.5° to its orbital plane (i.e., at an angle of 23.5° from the perpendicular or vertical axis). Crucially, throughout its orbital movement around the Sun, this tilt remains fixed in the exact same direction. Maximum Daylight (June 21): As the Earth makes its annual journey around the Sun, there are times when the Northern Hemisphere is tilted toward the Sun and times when it is tilted away. Around the summer solstice (June 21), the Northern Hemisphere reaches its maximum tilt directly toward the Sun and receives the largest and longest circle of illumination. This means that the Sun is above the horizon for a longer duration than on any other day of the year, resulting in the longest daylight. The further north you travel, the longer the daylight lasts. Once you reach the Arctic Circle, the Sun never sets at all during the solstice, resulting in a 24-hour period of continuous daylight. Regions north of the Arctic Circle experiencing this phenomenon are popularly called the Land of Midnight Sun. At the North Pole, there is a 6-month period of continuous daylight. (Reference: Class 6 NCERT, The Earth: Our Habitat, Chapter 3, Motions of the Earth) (Note: For a detailed breakdown of how this tilt affects different latitudes, refer to the explanation for Question 4 in the 2024 PYQs on Physical Geography).