Armagh Meteorological Record Formats for January 1842
The format of the meteorological readings has changed many times over the years but the readings for January 1842 can be interpreted using the following table. The Column number refers to the columns on the readings counted from left to right and the Contents refers to the instrument or measurement being recorded.
| Column | Contents |
| First Reading | |
| 1 | Date |
| 2 | External thermometer (evening) |
| 3 | Attached thermometer (evening) |
| 4 | Barometer (evening) |
| 5 | External thermometer (morning) |
| 6 | Attached thermometer (morning) |
| 7 | Barometer (morning) |
| 8 | Rain |
| 9 | Hygrometer |
