Temperature extremes in Vienna vary between summer highs of 95°F and - 4°F in winter. October may be damp and rainy, and light snowfalls occur in November and December. Snow, sometimes heavy, and frost can occur from January until mid-March. April, May, and early June offer pleasant spring weather, and summers are often delightful.
Vienna sometimes becomes uncomfortably hot in July and August, especially in the city's center, but the suburbs, particularly those which are elevated, are pleasant. The city is subject to rapid and marked changes in atmospheric pressures with accompanying winds. One such wind, the foehn, carries warm air from the south. It has a special meaning for the Viennese since many people blame it for peculiar human behavior. Average annual precipitation in Vienna is 21.02 inches.
The mountainous regions have long, cold winters with heavy snowfall and bright, crisp days. The Danube Basin usually has less snow, is more damp, and therefore has more gray and overcast days than the higher altitudes.