If you save a high enough percentage of your income, your net worth almost always increases over a full month. Even if the market has a poor month, your new savings often exceed your investment losses, causing your net worth to still increase before you flip the calendar.
But when the market has a good month, your net worth really pops, because your investments increase in value and you add a significant amount of new savings. This strategy is particularly effective when you first start saving. Imagine what your finances can look like years from now by following this strategy each month!