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In the less temperate regions of the world (like Russia... ...)...
Passive solar gain can still be an issue in summer especially in countries with very cold winters, but sunny summers (Germany I believe is one). Also poor (ie. low) thermal mass of a building (or particularly it's roof space, especially if converted for extra rooms) can be a problem too.
Anywhere continental, even Siberia, tends to be hot in the summer: parts of Siberia have average daily highs in summer in the mid- to high-30s oC.