| 1/00 | Meteorology |
| 1/02 | Meteorology Instruments for indicating weather conditions by measuring two or more variables, e.g. humidity, pressure, temperature, cloud cover, wind speed (G01W 1/1 takes precedence) |
| 1/04 | Meteorology Instruments for indicating weather conditions by measuring two or more variables, e.g. humidity, pressure, temperature, cloud cover, wind speed (G01W 1/1 takes precedence) giving only separate indications of the variables measured |
| 1/06 | Meteorology Instruments for indicating weather conditions by measuring two or more variables, e.g. humidity, pressure, temperature, cloud cover, wind speed (G01W 1/1 takes precedence) giving a combined indication of weather conditions (catathermometers for measuring "cooling value" related either to weather conditions or to comfort of other human environment G01W 1/17) |
| 1/08 | Meteorology Adaptations of balloons, missiles, or aircraft for meteorological purposes; Radiosondes |
| 1/10 | Meteorology Devices for predicting weather conditions |
| 1/11 | Meteorology Devices for indicating atmospheric humidity |
| 1/12 | Meteorology Sunshine-duration recorders |
| 1/14 | Meteorology Rainfall or precipitation gauges |
| 1/16 | Meteorology Measuring atmospheric potential differences, e.g. due to electrical charges in clouds |
| 1/17 | Meteorology Catathermometers for measuring "cooling value" related either to weather conditions or to comfort of other human environment |
| 1/18 | Meteorology Testing or calibrating meteorological apparatus |