The climate in MABA is mild and humid, with regularity in the rain cycles. Being adjacent to an aquatic environment increases the relative humidity in the coastal littoral of the region, fluctuating in different periods during the year : in fall and winter the humidity is higher, in spring and summer it decreases by the influence of warm and dry winds from the Northwest. The average humidity in summer is around 65%. In winter, the mean value increases to 80%, reaching 95%. In addition, over the littoral and the courses of rivers and streams fog banks are frequently formed during great part of fall and winter. Rainfall is around 1000 mm/year, mostly during summer. Important rainfall is also registered in May, October and November. The North winds (warm) are predominant in summer, the East winds are predominant in spring and summer and the Northwest winds are predominant in fall and spring. The East winds are the strongest. There is an important effect of two local winds : Sudestada (Southeastern) and Pampero (Southwestern). The first is caused by the rotation of Northern winds; it comes from the Atlantic as a cold and humid wind originating persistent drizzles that stop with the arrival of the Pampero, causing heavy rains and weather change. The Sudestada causes flooding in the coastal area of Río de la Plata. The West, Southwest and Northwest winds start strengthening inland. In no case the average speed exceeds 20 km/h. The mean annual temperature is around 17ºC ; inland the temperature decreases as the moderating effect of the river environment decreases. The mean maximum temperature is 24ºC in January, and the mean minimum temperature is 10ºC in July.