Presidents often try to pass major legislation or issue signature executive actions early, when public support and political capital are at their peak.
It's the early stretch when a new president usually gets the benefit of the doubt from much of the public.
Honeymoon-era numbers set a reference point that analysts and opponents use to gauge whether a president is gaining or losing ground later in the term.
After an election, some voters who opposed the winner still tell pollsters they are willing to give the new president a chance, lifting early approval numbers.
Early in a term, the president has not yet taken many controversial actions, so disapproval and 'no opinion' shares are typically smaller.
As policy fights, economic conditions, and unexpected events accumulate, partisan divisions reassert themselves and approval generally drifts downward.