| Isopleth | Generic term used for any constant |
| Isotach | Line joining places of same wind speed |
| Isogon | Line joining places of constant wind speed |
| Isotherm | Line joining places of same temperature |
| Isobar | Line joining places of same pressure |
| Isallobar | Line joining places of same pressure tendencies |
| Isopycnic | Line joining places of constant density |
| Isohyets | Line joining places of equal rainfall |
| Isomer | Line joining places of constant percentage of average rainfall |
| Isohel | Line joining places of constant sunshine |
