Rengo, Chile experiences mild winters with occasional frosts in June and July, with temperatures ranging from -3°C to 14°C. Spring brings moderate temperatures, warming up to highs of 27-32°C by April and May. Summer months are warm, with temperatures soaring to 34°C in January and December, but cooling down to around 21°C at night. Autumn returns to milder conditions, with temperatures dropping back down to around 9-18°C by October and November. Overall, the temperature fluctuations throughout the year are relatively moderate, with few extreme cold or hot periods.