Palermo, where it is

In Palermo, the capital of Sicily, the climate is Mediterranean with very mild, quite rainy winters and hot, sunny summers.
The city is exposed to the Sirocco, the wind from Africa, which is able to raise the temperature by several degrees: it can exceed 20 °C (68 °F) in winter, and can reach or exceed 40 °C (104 °F) in summer. However, it is also exposed to the Mistral, the cool wind which blows from Sardinia. In summer, when good weather prevails, the sea breeze tempers the heat.
During winter, it is rarely very cold, although there can sometimes be cold, windy, and rainy days, with highs around 10 °C (50 °F). Very rarely, in the areas of the city located farther from the coast, there may be some snowfalls. The coldest records are around 0 °C (32 °F).
Here are the average temperatures.
Palermo - Average temperatures
MonthJanFebMarAprMayJunJulAugSepOctNovDec
Min (°C)9910111519222320171310
Max (°C)151516192327303128241916
Min (°F)484850525966727368635550
Max (°F)595961667381868882756661

Rainfall amounts to 615 millimeters (24 inches) per year, with a maximum in autumn and winter and a minimum in summer, when it hardly ever rains. Here is the average precipitation.
Palermo - Average precipitation
MonthJanFebMarAprMayJunJulAugSepOctNovDecYear
Prec.(mm)90706045251051040808595615
Prec.(in)3.52.82.41.810.40.20.41.63.13.33.724.2
Days12997421158101280

The amount of sunshine in Palermo is great in summer, when clear skies prevail; in winter, sunny periods alternate with periods of bad weather, with rain, wind and thunderstorms. Here are the average sunshine hours per day.
Palermo - Sunshine
MonthJanFebMarAprMayJunJulAugSepOctNovDec
Hours556891011108754

Mondello Beach

The sea in Palermo is warm enough for swimming from July to September. In June, the sea is still a little cool, while in October, after the summer, the water temperature is still decent, around 23 °C (73 °F): in days of fine weather, perhaps with the sirocco, locals go to the beach of Mondello. Here is the average sea temperature.
Palermo - Sea temperature
MonthJanFebMarAprMayJunJulAugSepOctNovDec
Temp (°C)151515151821242625232017
Temp (°F)595959596470757977736863

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