Alexandria does not call the winter "rainy". It names the storms. A nawwa (نوّة, plural nawwāt) is a named spell of wind and rain in a sequence the city has kept for generations, and the Alexandria Port Authority publishes the list: the date each one is due, how many days it usually runs, which way the wind blows, and what kind of weather goes with it.
Read this as an almanac, not a forecast. The table says a nawwa is due on a date. It does not say a storm will arrive — a nawwa can pass with almost nothing, and rain can come on a day no nawwa is listed. For what the weather is actually going to do, use a weather forecast.
It is worth knowing anyway, because the rain here is concentrated. Alexandria gets about 168 mm of rain a year and roughly 87% of it falls between October and March. The city has 32,000 street gullies, 120,000 manholes and 66 outfalls straight to the sea, and keeps 155 suction tankers on standby when a storm is coming — and the main roads still flood.
Published tables differ from one another by a day or two. This one follows the Port Authority's own كشف النوات, read from the Arabic column; where a newspaper table disagrees, the entry says so.