Państwa w Europie, Ryazan', Rosja – O
- Obolyenki -1,6°C
- Obryezki -2,4°C
- Obukhovo -2,8°C
- Odoyevshchina -2,4°C
- Ogaryevo-Pochkovo -2,8°C
- Ogaryevskiye Vysyelki -2,8°C
- Ogibalovo -1,2°C
- Ogibalovo -2°C
- Ogorodnikovo -1,5°C
- Ogorodnikovskiye Vysyelki -1,5°C
- Okayemovo -1,2°C
- Okskiy -1,2°C
- Oktyabr' -1,3°C
- Oktyabr' -1,4°C
- Oktyabr'skiy -1,5°C
- Oktyabr'skoye -1,6°C
- Oktyabr'skoye Lyesnichyestvo -2,8°C
- Okun'kovo -1,5°C
- Ol'gino -1,6°C
- Ol'khi -2,1°C
- Ol'khi -3,1°C
- Ol'khi -2,4°C
- Ol'khovka -2,6°C
- Ol'khovka -2,3°C
- Ol'khovka 2 -2,6°C
- Ol'khovskiye Vysyelki -2,4°C
- Ol'khovyets -2,4°C
- Ol'shanka -2,4°C
- Olyeninskoye -1,2°C
- Orlovka -2°C
- Orlovka -2,6°C
- Orlovskiy -1,6°C
- Oryekhovka -2,6°C
- Oryekhovka -2,6°C
- Oryekhovo -1,4°C
- Oryeshkovo -1,6°C
- Osinovka -2,3°C
- Osinovo-Shilovo -2,4°C
- Os'kino -1,3°C
- Osovo -1,5°C
- Osovyets -2,4°C
- Ostraya Luka -1,5°C
- Ostro-Plastikovo -3,1°C
- Ostroukhovo -1,5°C
- Ostrovka -3,1°C
- Ostrovki -1,5°C
- Otrada -3,2°C
- Otrada -2,4°C
- Otrada -2,4°C
- Otvodnoye -0,2°C
- Ovchinniki -2,6°C
- Oznobishchyevo -2,3°C
- Ozyerikha -2,4°C
- Ozyerki -2,4°C
- Ozyerki -1,4°C
- Ozyerki -3,1°C
- Ozyerki -1,4°C
- Ozyerki -1,6°C
- Ozyernyy -2,7°C
- Ozyer'ye -1,3°C