Yes, pretty much. It has to do with the axis tilted 23 degrees to the ecliptic.
Summer, the northern hemisphere is tilted toward the sun meaning more direct sunlight.
During winter, the opposite.
We are soon coming to autumnal equinox, the tilt perfectly sideways to the ecliptic with the sun directly above the equator. Even then, at 45 degrees north or south, shadows match sunlight, effectively half if the radiant heat from the sun. further north or south, colder yet.