replaced 0 with NULL in temperature and elevation column
replaced 0 with NULL in temperature and elevation column
replaced 0 with NULL in temperature and elevation column
replaced 0 with NULL in temperature and elevation column
replaced 0 with NULL in temperature and elevation column
replaced 0 with NULL in temperature and elevation column
replaced 0 with NULL in temperature and elevation column
replaced 0 with NULL in temperature and elevation column
replaced 0 with NULL in temperature and elevation column
replaced 0 with NULL in temperature and elevation column