| adj_u2 | Adjust wind speed data |
| constDefaults | Constants |
| controlDefaults | Control default values |
| deltaVP | Slope of the saturation vapor pressure curve |
| dlh | Dayligth hours (N) |
| dr | Inverse relative distance Earth-Sun |
| e0 | Saturation Vapor Pressure |
| estG | Estimate soil heat flux (G) |
| estP | Estimate atmospheric pressure (P) |
| estRs | Estimate solar radiation (Rs) |
| ETref | FAO-56 Penman-Monteith grass reference evapotranspiration |
| prep.date | Prepare date |
| psyc_cons | psychrometric constant |
| Ra | Extraterrestrial radiation |
| Rn | Net radiation (Rn) |
| Rnl | Net longwave radiation (Rnl) |
| Rns | Net solar or net shortwave radiation (Rns) |
| Rso | Clear-sky solar radiation (Rso) |
| satVP | Saturation Vapor Pressure |
| SolarDec | Solar declination |
| VP | Actual vapor pressure |
| w | Solar time angle |
| ws | Sunset hour angle |