as_numeric_without_warnings
                        Wrapper function to convert into numeric
                        without warnings
choose_with_menu        Choose data with menu.
clean_station           Clean up station information
climate_jp              Climate data in Japan
climate_jp_full         Climate normals of all stations in Japan
climate_world           Climate data in the world
detail_colnames         Helper functions for download_detail()
detail_url              Build urls of detail climate data in Japan
download_climate        Download climate data of the world
download_detail         Download detail climate data in Japan
download_links          Download links for areas, countries and
                        stations
download_prec_no        Download prec_no and block_no of stations in
                        Japan
gracefully_fail         Graceful fail
head_3                  Wrapper function to head 3 items
mean_cli                Downloaded tables of climate normals in Japan
sleep                   Wrapper function to sleep
station_jp              Climate stations in Japan
station_jp_full         All stations in Japan
station_links           Station name and its URL
station_world           Climate stations of the world
wi                      Calculate warm index and cold index
