Morocco- Climate and when to go to Morocco

Climate
Generally the climate in Morocco remains quite dry for most of the year, although small amounts of rain do fall between November and March. The climate in Morocco varies according to the area and the altitude. Usually the Mediterranean and Atlantic coasts enjoy a mild climate with hot summers cooled down by the breezes coming from the Sea and the Ocean; with wet and rainy short winters. The weather becomes more extreme in the interior with very hot summers and cold winters. Winters are dry and bitterly cold in the Moroccan Sahara, due to the cold breeze off the Atlantic coast, while summers are extremely hot, even though the heat can be eased by the breeze.
Temperatures can fall down to below zero in the Atlas Mountains, at high altitudes snowfalls are heavy and the peaks stay snowcapped well into the summer.
The average winter temperature in Marrakech is around 21 degrees centigrade during the daytime, while in summer the average is about 38 degrees. 

When to go
On the northern coast the weather is fine all year round, although winter can bring cool and wet conditions. Beaches further south are prone to fog in the summer months, a phenomenon caused when the heat of the desert meets the chill Atlantic current. In the lowlands, the cooler months from October to April are popular among visitors. This time of year is pleasantly warm to hot (around 30°C) during the day and cool to cold (around 15°C) at night. Winter in the higher regions demands some serious insulation. If you're heading into the hills, the ski season usually lasts from December to March. April to October is the main trekking season, when the mountain snows start to thaw. High season is from mid-June to mid-September.