| ck_available | List All Available Climate Indices |
| ck_branas | Branas Hydrothermal Index |
| ck_compute | Compute a Climate Index by Name |
| ck_convert_temp | Convert Temperature Units |
| ck_cooling_degree_days | Cooling Degree Days |
| ck_diurnal_range | Diurnal Temperature Range |
| ck_dry_days | Maximum Consecutive Dry Days |
| ck_fire_danger | Fire Danger Index (Simplified) |
| ck_first_frost | First Frost Date |
| ck_frost_days | Frost Days |
| ck_growing_degree_days | Growing Degree Days |
| ck_growing_season | Growing Season Length |
| ck_heating_degree_days | Heating Degree Days |
| ck_heat_index | Heat Index |
| ck_heavy_precip | Heavy Precipitation Days |
| ck_huglin | Huglin Heliothermal Index |
| ck_humidex | Humidex |
| ck_ice_days | Ice Days |
| ck_last_frost | Last Frost Date |
| ck_max_1day_precip | Maximum 1-Day Precipitation |
| ck_max_5day_precip | Maximum 5-Day Precipitation |
| ck_metadata | Get Metadata for a Climate Index |
| ck_pet | Potential Evapotranspiration (Hargreaves Method) |
| ck_precip_intensity | Precipitation Intensity (SDII) |
| ck_spei | Standardized Precipitation-Evapotranspiration Index (SPEI) |
| ck_spi | Standardized Precipitation Index (SPI) |
| ck_summer_days | Summer Days |
| ck_total_precip | Total Precipitation |
| ck_tropical_nights | Tropical Nights |
| ck_very_heavy_precip | Very Heavy Precipitation Days |
| ck_warm_spell | Warm Spell Days |
| ck_wet_days | Maximum Consecutive Wet Days |
| ck_wind_chill | Wind Chill Temperature |
| ck_winkler | Winkler Index |
| clear_cache | Clear Cache |