One more view on solar time history. My take is that there is a fair amount of variability, even if production is aggregated over months. The red line is monthly kWh production from my SolarCity / Tesla inverter. Blue is the same monthly data coming from my newish Sense that went into commission in April 2019 (I had an earlier one from late 2016 through 2019).
Pretty to see the one month in 2020 when my Sense was off the network.