December has the longest solar days (noon-to-noon) because of the weird way a combination of the axial tilt of the earth and the eccentricity of its elliptical orbit conspire in December. Perihelion + Solstices = Long Days.
Here’s some more info about:
Solar Time: https://en.wikipedia.org/wiki/Solar_time
The Equation of Time: https://en.wikipedia.org/wiki/Equation_of_time
Milankovitch cycles: https://en.wikipedia.org/wiki/Milankovitch_cycles
Perihelion: https://en.wikipedia.org/wiki/Perihelion_and_aphelion
Apsis: https://en.wikipedia.org/wiki/Apsis
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Thanks to Nima Doroud for contributions. Created by Henry Reich