Nope, it's the opposite of what the last part of your post reads Tired Trucker.
Ethanol has significantly higher volatility than finished motor gasoline, and the warm months are where VOC air pollution from higher volatility is most problematic. Thus, E85 has LOWEST ethanol concentration in the warmer months due to volatility controls. Conversely, E85 has the HIGHEST ethanol concentration during the colder months, with less evaporative losses at lower ambient temperatures. Sensibly, finished motor gasoline specifications have the highest volatility limits in the colder months, opposite that in the warmest months. In both cases, seasonal volatility regulations result in lowest energy density gasolines in the coldest months, opposite in the warmest months.
I used to blend 1.5 to 2 million gallons of motor gasoline daily.
The graph at this link helps give a pictorial reference regarding the semi-logarithmic relationship between volatility and temperature. Diagrams of vapor pressure vs temperature are known as Cox Charts.
https://en.m.wikipedia.org/wiki/Volatility_(chemistry)
Hopefully this helps understanding of fuel volatility, why fuel volatility specifications are seasonal in one aspect, and how volatility honestly varies rapidly (non-linearly) with respect to temperature.