id ▁subt rop ical ▁climate ▁( K ö ppen ▁climate ▁classification ▁C wa ), ▁similar ▁to ▁other ▁areas ▁in ▁the ▁Ch aco ▁region . ▁It ▁is ▁the ▁warm est ▁city ▁in ▁Argentina , ▁with ▁an ▁annual ▁mean ▁temperature ▁of ▁. ▁Winter s ▁are ▁character ized ▁with ▁m ild ▁to ▁warm ▁temper atures ▁during ▁the ▁day ▁and ▁cool ▁night s ▁and ▁are ▁dry . ▁In ▁the ▁col dest ▁month , ▁June , ▁the ▁average ▁high ▁is ▁ ▁while ▁the ▁average ▁low ▁is ▁. ▁Tem per atures ▁can ▁occasionally ▁fall ▁below ▁free zing ▁during ▁cold ▁waves ▁although ▁during ▁heat ▁waves , ▁temper atures ▁can ▁reach ▁above ▁. ▁In ▁an ▁average ▁winter , ▁Las ▁L om itas ▁receives ▁ 8 . 5 ▁days ▁of ▁fro st ▁per ▁year ▁while ▁the ▁first ▁and ▁last ▁dates ▁of ▁fro st ▁are ▁ 2 8 ▁June ▁and ▁ 2 9 ▁July ▁respectively . ▁Spring ▁and ▁fall ▁are ▁transition ▁seasons ▁and ▁are ▁rather ▁short ▁featuring ▁hot ▁day time ▁temper atures ▁and ▁m ild ▁night time ▁temper atures . ▁F rost s ▁are ▁rare ▁in ▁these ▁seasons ▁and ▁temper atures ▁may ▁exceed ▁. ▁Sum mers ▁are ▁hot , ▁long ▁and ▁very ▁hum id , ▁ow ing ▁to ▁most ▁of ▁the ▁precip itation ▁occurr ing ▁during ▁this ▁season . ▁In ▁the ▁h ott est ▁month , ▁January , ▁the ▁average ▁high ▁is ▁ ▁while ▁the ▁average ▁low ▁is ▁. ▁During ▁the ▁most ▁extreme ▁heat ▁waves , ▁the ▁temperature ▁can ▁reach ▁above ▁. ▁The ▁average ▁relative ▁hum id ity ▁is ▁ 6 7 %,