Egypt lies within the North African desert belt; its general climatic characteristics, therefore, are low annual precipitation and a considerable seasonal and diurnal (daily) temperature range, with sunshine occurring throughout the year. In the desert, cyclones stir up sandstorms or dust storms, called khamsins (Arabic: “fifties,” as they are said to come 50 days per year), which occur most frequently from March to June; these are caused by tropical air from the south that moves northward as a result of the extension northeastward of the low-pressure system of The Sudan. A khamsin is accompanied by a sharp increase in temperature of 14 to 20 °F (8 to 11 °C), a drop in relative humidity (often to 10 percent), and thick dust; winds can reach gale force.
The climate is basically biseasonal, with winter lasting from November to March and summer from May to September, with short transitional periods intervening. The winters are cool and mild, and the summers are hot. Mean January minimum and maximum temperatures show a variation between 48 and 65 °F (9 and 18 °C) in Alexandria and 48 and 74 °F (9 and 23 °C) at Aswān.
The summer months are hot throughout the country’s inland, with mean midday high temperatures in June ranging from 91 °F (33 °C) at Cairo to 106 °F (41 °C) at Aswān. Egypt enjoys a very sunny climate, with some 12 hours of sunshine per day in the summer months and between 8 and 10 hours per day in winter. Extremes of temperature can occur, and prolonged winter cold spells or summer heat waves are not uncommon. Humidity diminishes noticeably from north to south and on the desert fringes. Along the Mediterranean coast the humidity is high throughout the year, but it is highest in summer. When high humidity levels coincide with high temperatures, oppressive conditions result.
Precipitation in Egypt occurs largely in the winter months; it is meagre on average but highly variable. The amount diminishes sharply southward; the annual average at Alexandria is about 7 inches (175 mm), Cairo has about 1 inch (25 mm), and Aswān receives virtually nothing—only about 0.1 inch (2.5 mm). The Red Sea coastal plain and the Western Desert are almost without precipitation. The Sinai Peninsula receives somewhat more precipitation: the northern sector has an annual average of about 5 inches (125 mm). © "Egypt" © Emmanuel Buchot and Britannica
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