Market Measures - September 16, 2022 - How Many Up Days In An Average Month

How many times should we expect to have an up day versus a down day? On any given month, the average expectation of the ratio of up/down days is 53% to 47%.

When deviating from that expectation, it is very reasonable to see months that have as few as 40% of and as many as 70% of the days be green. That can be loosely considered a one standard deviation range for the proportion of up days in a one-month period.