Lifecycle stage funnel reports aren't able to reflect data monthly at this time in a way that would compare data per each month. This would be very helpful to be able to report.
Yes this would be really helpful, for us, too. We would like to see, how the conversions rate develop from month to month, so that we can see if we remain stable, improve or worsen. For us it doesn't have to be the funnel report. It could also look like the KPI report, like in the attached photo. So that we can see each month the conversion from Lead to MQL, from MQL to SQL, SQL to Opportunity and Opportunity to customer.