It is winter in the Northern Hemisphere when we are closest to the sun.
It is summer in the Northern Hemisphere when the sun is farthest away from the sun.
It is NOT distance from the sun that causes seasons.
Like all planets in our solar system, the Earth is in an elliptical orbit around our Sun. In Earth's case, its orbit is nearly circular, so that the difference between Earth's farthest point from the Sun and its closest point is very small. Earth's orbit defines a two-dimensional plane which we call the ecliptic. It takes roughly 365 days for the Earth to go around the Sun once. This means that the Earth is rushing through space around the Sun at a rate of about 67,000 miles per hour! The time it takes for the Earth to go around the Sun one full time is what we call a year. The combined effect of the Earth's orbital motion and the tilt of its rotation axis result in the seasons.
The tilt of Earth’s axis one of the two reasons for the seasons
Imagine if Earth was not tilted. The sun’s rays would always strike the Earth most directly at the equator, and the subsolar point would always be the equator. Earth would receive a consistent intensity of solar radiation and there would be no seasons.
The earth's tilt determines the angle that the sun's rays strike the surface.
Due to the earth's tilt on its axis (23.5°) and its elliptical orbit around the sun, the relative location of the sun above the horizon is not constant from day to day when observed at the same time on each day.
http://vrum.chat.ru/Photo/Astro/analema.htm It shows position of the Sun on the sky in the same time of a day during one year. Analemma - a trace of the annual movement of the Sun on the sky - is well known among experts of sun-dials and old Earth's globes as a diagram of change of seasons and an equation of time. Between August 30th 1998 and August 19th 1999 I have photographed the Sun 36 times on a single frame of 60-mm film. The pictures were taken exactly at 5:45 UT (Universal time) of every tenth day.