Summary
Donald Trump’s January 20, 2025, inauguration is expected to be the coldest in 40 years.
Temperatures are forecast to be around 18–19°F (-7 to -8°C) at noon, and wind chills between 5–10°F (-15 to -12°C).
By evening, wind chills could drop to -1°F (-18°C).
Historic cold weather has previously disrupted ceremonies and parades.
Far as I’m aware, Reagan never wore diapers.
I’ll defer to P00ptart on the question of diapers.