One impulse should simulate one week and a half, not only one day, that's the point.
Dear Warspite: I'm playing meanwhile only the Barbarossa scenario, solo, to well learn the game that I've installed lees than a week ago, and I am enjoing a lot.
Cannot though honestly hide perplexity, meanwhile, regarding the feature we are talking about.
Consider furthermore, that this scenario ends in January-February 1942 only.
If you are going to meet one or two realistically, but not so much game mechanics wise, unprobable (to say the least) weather situations in the summer, as Germany you are pretty screwed out. No way to ever get close to Moscow, while a very hard and tough time and expectations to make it to Kiev or Leningrad (not to mention, again, that experiencing protracted snowy or blizzard weather in June - in Moscow as well not only Ukraina I think, but the Russian forumites here may provide a more sound opinion - , well, simply not true).
Edit: Cruisers ASW ships; I read that the unit is thought to simulate a squadron of DDs embedded with the ship, so in this optic it should well make sense.
Turn on the ability to set die rolls, then do what you like. You can set it to anything FREX with research, your own approximation of what the weather should be per the historical record (except you can't change the weather zone boundaries). Or make your own weather table, roll on it and implement the result (except it has to be one of the ten allowed from the chart).
For playing with someone else, of course they'd have to agree to this modification.