The orientation of the island (east to west), the relief and the predominant winds are the main factors shaping the climate.
Samos has average sun shining for 2.885 hours per year. This is the reason that its products have this scent and sweetness.
The average temperature on the island is 18.50 ºC. In the south part the lowest temperature is noticed in February at 10 ºC and the highest in July at 28.4 ºC. In the north part the lowest temperature is marked in January at 10.9 ºC and the highest in July with 26.5 ºC.
The absolute maximum temperature ever observed in Samos was 41 ºC and the absolute minimum – 3.4 ºC. At the mountains, of course has lower temperatures.top
On the south side, the humidity amounts to 60.4% in annual base. The highest is in December (72.6%) and the lowest in July (43.7%) meanwhile the commensurable counting in the north side, is 67%, 73% and 58%.
That means that the south part of the island has drier and hotter summer and cooler winter than the north. This phenomenon is more in the south west of the island, due to the fact that it is sheltered from weather by mountain Kerkis.
Among the islands of Aegean Sea, Samos possesses the merit in rainfalls. Usually, rain starts in October and stops in April.
The average annual rainfall in the north is 918 mm and 709 mm in the south, with rainiest month in December. The rainfalls at the mountainous are much more.
Snow and hail are common in the highlands but not at all in the valleys or flatlands.
It is also among the first regions where thunder storm outbreaks occur almost 30 times per year.top
The most frequent wind is the North, on the Island. North winds flow 54% of the total time in the year. It is the main summer wind known also as “meltemi”. Meltemi sets off from the sea during the summer months and is what keeps the temperature and the humidity in moderate levels. However the journey of “Meltemi” does not stop here, continuing along the ridges and the flatlands of the island, obtain ground’s temperature and ends up dry and hot at the other side of the island (which has been burnt plenty of times mainly because of this wind).
The south wind flows about 20% of the total time, in a year and mainly during the winter.
The south winds coming liquid from the Mediterranean sea, encounter the barrier that created by the mountains, and they are forced to go higher and create the rain.
The island also experiences soft drizzling rain of 5% each year. Finally, periods of apnea are observed over 21% of the year, mainly in spring and autumn.top
According to the aforementioned Samos can be compartmentalized in four climatic zones.
The north part till 300m height : warm and malt winters, cool summers, and the climate is wet, with plenty of rain and calm winds.
The south part till 300m height : It has drier summers, cooler winter, stronger winds and less rainfalls.
The Highlands over 300 m. height : In these areas because of the height, the temperature is lower and the winds are more turbulent and strong.
Moist and leeward areas : (there are several of them), by reason of the relief and the water that is there, is more liquid and windward, where microclimates created. These areas have no clear boundaries and a progressively entering the boundaries of the other.