Here's what we need for an October bottom

Traders work on the floor of the New York Stock Exchange.
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You've heard this many times: October is traditionally the month where stocks bottom.

There is some truth to this. The Stock Trader's Almanac calls October the "bear killer" because it has turned the tide in 12 post-World War II bear markets: 1946, 1957, 1960, 1962, 1966, 1974, 1987, 1990, 1998, 2001, 2002, and 2011.

The "worst six months of the year" trend also ends in October.

Still, these are not normal times and anyone who relies on seasonality exclusively is courting trouble.

What do we need for a bottom?