I stumbled on this, from WeatherSpark:
https://weatherspark.com/y/653/Avera...tes-Year-Round
enter any location you like at the top. There's all kinds of weather data here on a big picture, annual basis, like the solar energy over the year at Williams:
I'd been looking for a reference like this with numbers to show the diff btwn winter energy and summer energy as to why the thermals as so weak. I mean of course we know this, but to have some numbers against it is nice. A 4x diff between the weakest winter solar day and the strongest summer day!