The Gran Chaco records some of the highest temperatures anywhere in the continent from December to February, often reaching 45°C or more. At these times, the siesta becomes even more sacred and people take to drinking chilled tereré. The best times to see wildlife are in the early morning or late afternoon and the best time of year to visit is from June to September: although night frosts are not unknown in June and July, daytime temperatures generally hover in the agreeable 20–25°C bracket. Moreover, the deciduous trees lose their leaves, so you’ve more chance of seeing wildlife. The rainy season generally lasts from October to May but violent downpours are possible throughout the year. For outdoor activities arm yourself with insect repellent, sunscreen and a hat, especially in summer; and make sure you have plentiful drinking-water supplies.