I disagree about a 7 day period being too short of a week. I actually (when writing) tend to lean toward triads. (3 day weeks, or 3 week months, or both).
It seems logical since nearly every culture in the world (including most major religious sub-cultures) have at some point placed a degree of significance around the number 3.
So, usually, a "week" in my stories is "two triads" (6 days) and so on..
I also don't think (with the tech level proposed) that precise calculations of the days in a year, or weeks in a month, or even hours in a day makes much sense as far as /plots/ go... people at that age wouldn't know exactly how many days it takes to orbit the sun, ya?
As far as tides and such... climate.. whatever... I agree it would be nice to know exactly what we (the mappers) are dealing with