While every day has its own uniqueness, I think Wednesdays should be traded with caution. The reason for this is because the oil report comes out every Wednesday and that can have an impact on the markets. As of the time of this writing the oil report comes out every Wednesday at 10:30am EST. Please confirm the time and date yourself in case of a change made after this writing. Yes other reports can move the market just as much if not more but again we are keeping trading simple. Also, by keeping the oil report in mind as professional traders do, sometimes previous to the report whether it is days or minutes professional traders speculate on the possible impact the report will have on the market. Thus, they might go short or long prior to the report in anticipation and correct their position according if they are wrong. Basically, trade the rumor then trade the fact.