Weather
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The average temperature in the Pampas is 18° C. The pampas has a 'high sun' or dry season in the summer, which in the Southern Hemisphere is in December. The wind blows most of the time. The climate in the pampas is humid and warm.
Summer temperatures are more uniform than winter temperatures, ranging from 20 °C (68 °F) to 32 °C (90 °F)in the north, 17 °C (63 °F) to 30 °C (86 °F) in most of the potato farms 15 °C (59 °F) to 27 °C (81 °F) along the Atlantic coast. Extremely hot days might reach over 40 °C (104 °F).
Fall arrives gradually in March, and peaks in April and May. In April, highs will range from 20 to 25 °C (68 to 77 °F) and lows from 9 to 13 °C (48 to 55 °F). The first frosts arrive in mid-April in the south, and in late May or early June in the north.
Winters are generally mild, although cold waves do occur. Normal temperatures range from 12 to 19 °C (54 to 66 °F) during the day, and from 1 to 6 °C (34 to 43 °F) at night. With strong northerly winds, days of over 25 °C (77 °F) can be recorded almost everywhere, whereas during cold waves, high temperatures can be only 6°C (43F). Frost occurs everywhere in the Pampas, although it is much more frequent in the southwest, and less so around the Parana and Uruguay rivers. Temperatures under −5 °C (23 °F) can occur everywhere, whereas values of −10 °C (14 °F) or lower are confined to the south and west. Snow never falls in the northernmost third, and is rare and light elsewhere, except for exceptional events where depths have reached 30 cm (12 inches).
Springs are very variable, it is warmer than fall in most areas (especially in the west) but significantly colder along the Atlantic. Violent storms are more common, as well as wide temperature variations: days of 35 °C (95 °F) can give way to nights of under 5 °C (41 °F) or even frost, all within the same week.