For fast travel, you should be able to choose the weather and time of day for when you arrive at the new location, so you can have a more immersive and user preferred experience.

I want to have preset weather options (cloudy, sunny, rain, thunderstorm).
I want to have a time of arrival option (exact hour/minute of arrival).

So, I could fast travel to a location, then be given a menu with a 'Weather' and 'Time of Arrival' option.

In the loadout or menu screen, having a static weather/time of day option would be additionally nice.
Same options as above, but they would not change.

For most missions, and free roam, I want to play at night and currently have to use workarounds to get to night time (kill myself or wait).

This feature is amplified in necessity from the new Sam Fisher dlc, since using his outfit is intended for dark environments.