Signy, Factory Cove, Borge Bay, Signy Island, South Orkneys 60deg43'S 45deg36'W
| 1947 | Data collection begins |
| 1969 | Manual observations cease, All observations from autographic records |
| 1970 January | Instruments in use
Thermograph, Barograph, Anemograph reading from Munro anemometer |
| 1972 | 12Z manual ob |
| 1972 | Instruments in use Mercury Barometer, Munro Mk.1B Anemograph, Thermometers, Thermograph, Barograph |
| 1972 January | Incorrect correction tables in use for calculating MSLP |
| 1973 November | MSLP correction table corrected |
| 1978 February | MSLP correction table changed |
| 1979 April | PAB replaces Mercury Barometer |
| 1980 | Munro Mk.II replaces Munro Mk.1B |
| 1980 May | 6 hourly manual obs |
| 1981 | 12 hourly manual obs |
| 1983 September | Munro Mk.4a replaces Munro Mk.IIB |
| 1984 | Munro Mk.IIB replaces Munro Mk.4A |
| 1985 January | Position of thermometer screen changed |
| 1988 February | Vector A100S anemometer replaces Munro Mk.IIB |
| 1988 February | KDG pressure sensor replaces PAB |
| 1988 February | PRTs replace Thermometers |
| 1988 February | 3 hourly automatic obs, 12 hourly manual obs |
| 1991 | Setra pressure sensor replaces KDG pressure sensor |
| 1997 | Base occupied summer only |