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Yes the sun's radiation on a sheet placed exactly perpendicular to it is essentially the same in winter and summer. In fact it is slightly greater because we are nearest to the sun in our elliptical orbit in January. The difference between winter and summer is due to the fact that the sun is lower in the sky (in the UK and other similar spots on the northern hemisphere) and so the same energy is spread over a larger footprint. and also that the days are shorter and the nights longer (while we are looking at the cold of outer space).One interesting aside is that the strength of the sun on your face while you are standing up is greater in winter.
True atmospheric attenuation does have a significant effect I had forgotten to include that. Checking it out, it could be around 40% difference between midday midsummer and midwinter at UK latitudes I reckon.
This dimming is probably caused by particles in the air. If the air is properly clear the sun will only be affected by a fraction of a stellar magnitude between it highest point and its lowest point at midlands latitudes.
Joshua asked the Naked Scientists: Does the sun in winter heat everything the same?What do you think?