The Western part of  Country is a large plain denominated 'El Chaco'.
The rainfall regime in the region is Tropical summer rainfall regime, as in the eastern part of the Country . The Parana river divides the  drier west from the wetter eastern part o the country.
The Chaco is characterized by a semi permanent low-pressure system, with largest intensity in the summer. This low  brings

This region has very high  mean temperatures, with maximum reaching  during summer over 30C,. Minimum temperatures are found in July. Only in July there is a small probability of reaching temperatures below zero. Spring temperatures are higher than autumn temperatures. This is caused by the small amount of cloudiness in late winter and sting coinciding with the end of the dry season, so that temperatures repond rapidly to the increasing intensity of solar radiation. This quick rise in temperatures is the reason for the early formation of the low-pressure over El Chaco. The winds resulting from the low are northerly and bring with them moisture from the Amazon.
 
 

PRECIPITATION	TEMPERATURE

WET-DAY FREQUENCY Number of days/mo with Precipitation	GROUND-FROST FREQUENCY Number of days/mo with Min. Temp. < 0 deg. C