I know that in Edit Town you can click on what seasons and types of weather you want. Also shorten the time and it affects all games, even ones that I have been playing.
I set mine to be 15 days in Fall, 25 for Spring and Summer and Winter at seven. I keep and will keep changing until I find the set length I like. I disabled the rain and planning on doing so with fog, decided I don't like fog. No more rain messing up the days. Sims couldn't go out and gather it rained so much, and temps were so low in Fall they kept showing the cold moodlet.
Strange, the temps I have don't fit the season; of what they should be; fall had 30s day 20s night and now in Winter temps are mid 50s day and 30s night.
I had, as I call it, an idiot moment in stating it was Edit Town, and mixed up some of what I wanted to say.
In options, you can change what is in a season, such as rain, snow and such, clck to delete them. This will work for any game after you have clicked it. You can, I believe, also set it to have the only seasons you want, such as no winter or spring all of the time.
For games that have already been started, they have to be changed individually.
I haven't tried the cheats to see if I can change the setting for temps, level of snow and such, although I think that would be nice to be able to do.
Hope what I said this time is clearer.