"It changes weather more realistically then most generators meaning that you will not be all nice and sunny then 3 hours later be in a snow storm." I don't know which RPG weather generators you're using, but I don't know of any that are less realistic than this one.
It doesn't give temperatures or wind speeds, qualitatively or quantitatively. There's no difference between night and day. There are no seasons and no climate zones (e.g. subarctic vs tropical, coastal vs inland, or wet vs dry). There are no prevailing winds. It doesn't yield sleet, fog, mudslides, tornadoes, floods, hurricanes, tidal waves, or dust storms. It includes no options for fantasy or sci-fi settings. Actually, it includes no options at all. You get the weather it rolls up, and that's that.
There's no picking up from where you left off last time, unless your command window has stayed open the whole time. Each new interval advances the time by 3 hours, but you could always ignore the times it names. Each new interval involves a weather roll and a wind roll to determine what happens to the weather and wind index values. The index values range from 0 to 10. Half the time, the index value stays the same. Half the time, an index value goes up or down by one, within the 0-10 range. The weather index progresses from sunshine to blizzard. You won't make that leap in a single roll, but you could do it from one day to the next. Yeah, you could get blizzards every few days, regardless of season or climate. The wind index is only about wind direction, not intensity. You could flip from a northerly wind to a southerly wind and back every 3 hours. You get the cardinal wind directions (n, w, e, w) at lower index values and diagonal winds (ne, nw, se, sw) at the higher index values (or calm or "changing drection [sic] every few minutes" at the highest index values.
Search onilne for an RPG weather generator. You're sure to find something more realistic, more varied, and more usable. Frankly, this generator seems like something I might have dashed off in the early 80s before my RPG play had matured.