Buffalo has a reputation for snowy winters, but it is rarely the snowiest city in New York State. The region experiences a fairly humid, continental-type climate, but with a definite maritime flavor due to strong modification from the Great Lakes (Köppen climate classification "Dfb" — uniform precipitation distribution). The transitional seasons are very brief in Buffalo and Western New York.
Winters in Western New York are generally cold and snowy, but are changeable and include frequent thaws and rain as well. Winters can also be quite long in Western New York, usually spanning from mid-November to mid-March. Snow covers the ground more often than not from late December into early March, but periods of bare ground are not uncommon. Over half of the annual snowfall comes from the lake effect process and is much localized. Lake effect snow occurs when cold air crosses the relatively warm lake waters and becomes saturated, creating clouds and precipitation downwind. Due to the prevailing winds, areas south of Buffalo receive much more lake effect snow than locations to the north. The lake snow machine starts as early as mid-November, peaks in December, and then virtually shuts down after Lake Erie freezes in mid-to-late January. The most well-known snowstorm in Buffalo's history, the Blizzard of '77, was not a lake effect snowstorm in Buffalo in the normal sense of that term (Lake Erie was frozen over at the time), but instead resulted from a combination of high winds and snow previously accumulated both on land and on frozen Lake Erie. Snow does not typically impair the city's operation, but can cause significant damage as with the October 2006 storm.
Buffalo has the sunniest and driest summers of any major city in the Northeast, but still has enough rain to keep vegetation green and lush. Summers are marked by plentiful sunshine and moderate humidity and temperature. It receives, on average, over 65% of possible sunshine in June, July and August
