Any precipitation is sparse during summer and falls generally in the form of showers and/or thunderstorms. Due to its location in a strong rain shadow because of Mount Parnitha, however, the Athenian climate is much drier compared to most of the rest of mediterranean Europe. The mountainous northern suburbs, for their part, experience a somewhat differentiated climatic pattern, with generally lower temperatures and more substantial snowfalls during winter. Fog is highly unusual in the city centre but it is more frequent to the east, behind the Hymettus mountain range.
Snowfalls occur almost on a yearly basis, though these do not normally lead to significant, if any, disruption. Nonetheless, the city has experienced its share of heavy snowfalls, not least in the past decade; during the blizzards of March 1987, February 1992, January 2002, February 2004 and January 2006, snow literally blanketed large parts of the metropolitan area, causing havoc across many suburbs of the city.
Spring and fall (autumn) are considered ideal seasons for sightseeing and all kinds of outdoor activities. Summers can be particularly hot and at times prone to smog and pollution related conditions (however, much less so than in the past). The average daytime maximum temperature for the month of July is 92.3 °F (33.5 °C) and heatwaves are relatively common, occurring generally during the months of July and/or August, when hot air masses sweep across Greece from the south or the southwest. On such days only temperature maxima soar over 100 °F (38 °C).

Geography:

Athens sprawls across the central plain of Attica, often referred to as the Attica Basin which is bound by Mount Aegaleo in the west, Mount Parnitha in the north, Mount Penteli in the northeast, Mount Hymettus in the east, and the Saronic Gulf in the southwest. The capital has expanded to cover the entire plain, making future growth difficult.