There are a few basic points about the climate on Mars that are worth reviewing:
Planets do not orbit the sun in perfect circles, sometimes they are slightly closer to the sun, sometimes further away. This is called orbital eccentricity and it contributes far greater changes to Martian climate than to that of the Earth because variations in Mars' orbit are five times greater than the Earth. Mars has no oceans and only a very thin atmosphere, which means there is very little thermal inertia – the climate is much more susceptible to change caused by external influences. The whole planet is subject to massive dust storms, and these have many causal effects on the planet’s climate, very little of which we understand yet. We have virtually no historical data about the climate of Mars prior to the 1970s, except for drawings (and latterly, photographs) that reveal changes in gross surface features (i.e. features that can be seen from Earth through telescopes). It is not possible to tell if current observations reveal frequent or infrequent events, trends or outliers. https://www.skepticalscience.com/global-warming-on-mars.htm
https://www.google.com/amp/s/amp.space.com/33001-mars-ice-age-ending-now.html