Question:
There are at least three possibilities.

Does it follow that "In total, there are a minimum of 3 things that are possible."?
Answer:
yes

Question:
This month-by-month listing can therefore only be approximate.

Does it follow that "This month-by-month listing can thus be an approximation"?
Answer:
yes

Question:
One of the most handsome of France's ports, La Rochelle has always been innovative and today calls itself belle et rebelle (beautiful and rebellious).

Does it follow that "La Rochelle is fittingly known in France as belle et rebelle, meaning beautiful and rebellious."?
Answer:
yes

Question:
Crete remained a province of the Roman Empire until a.d. 395, with Gertis as its capital.

Does it follow that "Gertis had a population of 8,000."?
Answer:
it is not possible to tell