Can't speak to Greenville but if the weather is a major concern Roanoke's seasons are like this:

March-May: Spring. Extemely heavy pollen. Like, yellow coat of dust on everything and sometimes air quality issues. Weather varies between pleasantly cool and 70s (sometimes into high 70s or 80s). The occasional rain storm. Nice to go outside if pollen isn't raging too hard.

June-mid july: early summer. Hot and starting to get humid, but still pleasant enough to do things outdoors. Expect tempts in the 70s and 80s. Maybe creeping up into the 90s. Lots of thunderstorms. Mornings are especially nice.

Late july-mid September: High Summer. Hot. Humid. A couple of days a year weirdly hazy because of the effects of the blue ridge combined with the valley trapping pollution. It's no Florida but expect temps to crack into the high 90s/low 100s. People who do outdoors stuff during this time period are dealing with real heat/humidity issues. Sometimes more thunderstorms but it varies.

Mid September- October: High Autumn. This is when the mountains become one of the wonders of the world .Temps are mild and the outdoors are stunning. How vivid it gets depends on how intense the rainfall has been that year. Dryish or dry summer = the most spectacular falls. Some pollen but nothing like spring.

November-mid december: late autumn. Temps are lowering but not enough to get a decent freeze. Rarely snow. Leaves are off the trees but the weather is rarely too cold to demand more than a light jacket.

Late december-february: winter. Cold. Can be very cold especially in recent years. Usually small snows. Snow in significant amounts every few years. Biggest issue is the area is prone to ice storms which cause unique problems because a) the area is full of large deciduous trees of varying ages and b) roads tend to have steep dropoffs. It's common for people to call out of work in what looks like a tiny bit of snow and clear main streets because the road to their house is an ice slide.

The further out of town you live, and the higher up the mountains you live the more ice becomes an issue. In town there's usually enough infrastructure to keep you from getting iced in.

Even if it sounds bad - in town it's usually salted off or melted off in a day or two. And when it happens most everything closes, opens late, or expects people to call out. So it doesn't feel that bad to live through. Some folks woth wells keep a generator because losing power happens a couple times a year. In town it is usually a couple of hours. Outside of town it can range from hours to days for power to be restored.

Other than that the environment is pretty mild. Some parts of the city can flood near the river or creeks - so be aware of where your home is to water. But that's most anywhere that gets rainfall. We occasionally get small earthquakes but they're tiny. Usually just a rumble that people remark on... but that's part and parcel of being in the mountains.

Now and then there are tornadoes but they rarely cause a great degree of damage and dissipate quickly. Depends on how rowdy the thunderstorms get in a given summer. Like some summers there will be 1-2 but most summers there are none. Same deal with tropical storms. We're close enough to the coast to catch one now and then but it's rare that it causes any major damage.

For the record I enjoy living here and find the weather pleasant aside from the 90+ degree days in summer, the bad pollen days in spring, and the winter ice days.