| Isobars | They are lines on a map connecting places of equal atmospheric pressure. |
| Isotherms | They are lines on a map connecting places of equal temperature. |
| Isohyets | They are lines on a map connecting places of equal amount of rainfall over a period of time. |
| Isohels | They are lines on a map connecting places of same mean daily duration of sunshine. |
| Isonephs | They are lines on a map connecting places of same mean value of cloud cover. |
| Isohaline | They are lines on a ocean map connecting places of equal salinity. |
| Isohume | They are lines on a map connecting places of equal relative humidity. |