The sun's always "at an angle" unless you live somewhere between the tropics of Cancer and Capricorn where the sun will be overhead on just one or two days of the year. At present, the sun will be overhead a few degrees north of the equator, in which case your trees would be in the condition you describe only if you lived many thousands of feet up a mountain, somewhere at the bottom end of Central America or thereabouts. Alternatively, you could be looking in the wrong direction for your rainbows.