I have not played weather teams, so this may not be accurate. I'll take this down my different weather patterns if I may:
Rain: Perfect for pokemon like Manaphy and Kingdra. These teams can usually be taken by Electric-types saying the teams are most themed around there, so I would be weary in using this Rain team because one Electrivire using Thunder would be pretty devastating.
While thunder might be a move used on Rain Dance, team, I have yet to see it popularly used. Most people use Ludicolo and Kabutops, two of the most devastating rain sweepers around.
Sandstorm: Another common favorite that suits pokemon like Hippowdon, Claydol, Rhyperior, and Heatran. Honestly, most of the guys can be taken out by pokemon from the Rain team, like Kingdra. You can also look at it from another perspective and get dragons that know Aqua Tail in there to finish it.
Nobody uses Claydol in SS teams because, well, nobody uses Claydol. Rhyperior, maybe, but unlikely. People will use pokemon like Tyranitar, Hippowdon, Bronzong, Skarmory, etc. And most dragons don't use Aqua Tail, honestly. Latias uses Surf, but that's pretty much it.
Hail: Something I haven't seen alot of, but it would suit Frosslass perfectly along with Glaceon and Abomasnow. These guys can be taken out fairly quickly be Sun team pokemon, like Arcanine, Heatran, Flareon, and others. These pokemon from the Hail team will quickly go down if you pit the Fire team against them.
Hail teams aren't seen that much because SS teams, and the odd Rain Dance team are seen much more often, and they are better than Hail by far. You also forgot to mention the mighty Stallrein, who can be a beast on Hail teams
Sun team: Like I've said already, fits pokemon like Arcanine, Heatran, Flareon, and others perfectly. You would have to be cautious of the Sandstorm team or Rain team here for easy takeout. Also, watch out for Gyarados and his Earthquake.
Gyarados doesn't even use EQ that much anymore. What do poeple go for now...Return or Bounce I think? Maybe that replaces stone edge...and Sun teams don't really exist outside of UU due to the fact that they...well they suck quite frankly.
Castform: Reason why I put a section of him here is because he can transform into one of the three teams, so he can be versatile and a key factor. With him on your team, you can make a mix, which will be dfficult to take down. My best advice is to try to OHKO him as fast as you can. Is thiss enough detail?
rotect with Partener EXPLODE and do very heavy damenge.
