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The performance range actually goes more along the lines of what is expected if you just think about the compound. When it is too hot, all season compound becomes too soft and you lose performance which is where a summer compound works. As the temperature drops below 5C/41F, the compound used in all seasons is still in a good temperature range, but the summer tyres have now hit their glass transition. As the temperature drops below -5C/23F, all seasons start to get too stiff and winter tyres begin to outperform them.
Hot - Summer Tyres
Cold - All Seasons
Below Freezing - Winter Tyres
This is assuming dry conditions as otherwise we end up in a hurr durr you call that snow argument as has happened in the previous dozen or more posts.
It's just basic chemistry from the compound that determines this.
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