Resistencia is one of the warmest cities in Argentina, and is known for its extremely hot, humid summer weather with frequent lightning. The climate is subtropical, with a cooler, dryer season and a long, humid summer. Fall and spring are often marked by sudden transitions from summer weather patterns to winter weather patterns.
During the summer, temperatures attain highs of 30°C (86F) to 35°C (95F) on a daily basis, often up to 38°C (100F). The record temperature is 42.3°C (108.1F). Nights are warm and sticky, between 19°C (66F) and 25°C (77F), and afternoon thunderstorms are common. The transition to fall is slow: March's temperatures are very similar to midsummer, and April is still warm with an average high of 26°C (79F) and a low of 17°C (63F), and rainfall is very abundant: 284 mm, or 11.2 in during that month. The dry, cool season starts in May and lasts until September. During its peak in June and July, the average high is 20°C (68F) and the average low is 10°C (50F), with rainfall below 50 mm (2 in) in a month. These averages reflect the fact that there are two distinct weather patterns that alternate in the winter: the northerly, tropical pattern, and the southerly pattern of the Pampas: thus, there are periods of very warm, dry weather (25°C to 30°C, or 77F to 86F) with warm nights (15°C, or 59F) followed by strong southerly winds, often accompanied with drizzle and temperatures that hover around 10°C (50F) for days at a time (creating a surprisingly cold feeling), followed by dry air and blue skies and cold nights (2°C to 7°C, or 36F to 45F) and pleasant, cool days between 15°C and 20°C (59F to 68F). Light frost occurs under very calm conditions with cold air in place; usually measured temperatures will hover between 0°C and 3°C (32F to 37F) but frost will cover the ground. On occasion, however, under very cold weather patterns, measured temperatures reach -2°C (28F), with a record low of -3.8°C (25F)
