Wetterstationen des Deutschen Wetterdienstes (DWD)
| Stationsname (Ort) | Seehöhe | Bundesland |
| Osterscheps | 5 m | NI |
| Osterschnatebüll | 3 m | SH |
| Ostersode | 4 m | NI |
| Osterwald | 50 m | NI |
| Osterwick-Höven | 85 m | NW |
| Osterwieck | 150 m | ST |
| Osterwieck-Rimbeck | 100 m | ST |
| Österwiehe | 90 m | NW |
| Osterzell | 723 m | BY |
| Ostgroßefehn | 5 m | NI |
| Ostheim v. d. Rhön | 300 m | BY |
| Ostheim v.d. Rhön | 314 m | BY |
| Ostönnen | 100 m | NW |
| Ostrau | 160 m | SN |
| Ostrhauderfehn-Potshausen | 1 m | NI |
| Östringen | 165 m | BW |
| Östringen (PH) | 160 m | BW |
| Östringen-Eichelberg | 240 m | BW |
| Ostritz | 213 m | SN |
| Oststeinbek | 20 m | SH |
| Othfresen | 170 m | NI |
| Ottbergen | 121 m | NI |
| Ottendorf | 240 m | TH |
| Ottendorf-Okrilla | 180 m | SN |
| Ottenheim | 150 m | BW |
| Ottenhof | 460 m | BY |
| Ottenhöfen | 380 m | BW |
| Ottensen | 21 m | NI |
| Ottenstein | 295 m | NI |
| Otter | 50 m | NI |
| Otterbach | 260 m | HE |
| Otterberg | 250 m | RP |
| Otterfing | 669 m | BY |
| Otterfing (PH) | 670 m | BY |
| Otterndorf-Mahrdorf | 1 m | NI |
| Otterndorf/Niederelbe | 2 m | NI |
| Otternhagen | 40 m | NI |
| Ottersberg | 11 m | NI |
| Ottersberg-Otterstedt | 17 m | NI |
| Otterstein | 8 m | NI |
| Ottleben | 115 m | ST |
| Ottobeuren | 667 m | BY |
| Ottobeuren (PH) | 660 m | BY |
| Ottrau-Immichenhain | 340 m | HE |
| Ottstedt a. Berge | 250 m | TH |
| Ottweiler (PH) | 290 m | SL |
| Otzberg-Habitzheim | 172 m | HE |
| Otzberg-Lengfeld | 200 m | HE |
| Otzenhausen | 480 m | SL |
| Otzenhausen | 433 m | SL |