Seasons on Mars

Like the Earth, Mars is tilted in respect to the plane of its orbit, and therefore experiences seasons.

Mars' equator is tilted from the planet's orbital plane at an angle of 25º, 19?.

As the length of the Martian year is about double that of Earth, so is the length of seasons.

Because Mars has a more eccentric orbit than Earth, the seasons on Mars vary more in length than they do on Earth.

In the northern hemisphere, spring on Mars begins during the vernal equinox, when the Martian Solar Longitude (Ls), the angle between Mars and the Sun, is 0°. Days become longer and nights become shorter.

At the summer solstice, which in the northern hemisphere occurs when Ls=90°, the day reaches its maximum length.

In the North, the autumnal equinox takes place when Ls = 180 °. The winter solstice begins when Ls=270 °

In the southern hemisphere, the seasons are reversed.
Currently the northern hemisphere enjoys a milder climate that the Southern Hemisphere. In the north, winter and autumn take place at perihelion, when Mars is closest to the Sun. This causes autumn and winter to be shorter and the climate to be milder.