Where can I find solar insolation for windows (tilt=90) for November to April (when solar heat is helpful and when trees are bare)? Ideally considering clouds.

Latitude: 44 degrees north. (80 west) Most sites about solar insolation focus on photovoltaics, not windows / vertical surfaces. Most sites assume a tilt of 0 (horizontal) or a continually optimized tilt.… Latitude: 44 degrees north. (80 west) Most sites about solar insolation focus on photovoltaics, not windows / vertical surfaces. Most sites assume a tilt of 0 (horizontal) or a continually optimized tilt.…Read MoreGreenBuildingAdvisor