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The butt-dyno can be pretty deceiving... I have noticed this myself though at times.
Over the past couple winters in chicagoland being VERY cold besides this past winter I definitely noticed a difference. The car will add extra fuel due to the colder air being inhaled to keep things cooler in the combustion chamber, I noticed abysmal gas mileage in 2013 and 2014 winters.
Once the warmer weather rolls in the computer adjusts accordingly for fuel/air and might feel like it is making a touch more power. This is just my understanding of it.
 

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It may be possible depending on baro pressue and humidity.
 

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I feel a power and economy gain at about 72 F (standard day temp) and humid; not sure about what % of humidity.

One of my vehicles is a 94 Geo Tracker. Is more noticeable with its puny engine.
 

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my car feels beastmode when its In the mid 50's- 60's with low humidity
 

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Should be slower as the ECU pulls timing when the intake air and coolant temp rise. And trust me, you can definitely feel the difference in Australia :)
 
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