Room temperature superconductivity at 1 atm

[dsmike1980]

Is it likely for any materials to have superconducting at several different ranges of temperatures?

For example, it's only superconducting between 100 and 110 K, 130 and 140 K, 170 and 181 K, 189 and 191 K, etc.  Outside those ranges it's not superconducting.  Is that plausible?

Also for whoever answers the above question, what is the highest temperature at which superconductivity is possible? There is much talk of room temperature superconductors, but what about hotter?