Iquitos experiences an equatorial climate that is a tropical rainforest climate (Af) under the Köppen climate classification, more subject to the Intertropical Convergence Zone than the trade winds and with no cyclones. There is constant rainfall throughout the year, without a distinct dry season, but a wetter summer. Because the seasons are not sensitive in the equatorial zone, Iquitos has only two seasons. The rainy summer arrives in November and ends in May. March and April have the heaviest rains and humidity, with precipitation between 280 and 300 millimetres (11 and 12 in), respectively. In May, the Amazon River, one of the rivers surrounding the city, reaches its highest levels. It falls around 9 to 12 metres (30 to 39 ft) at its lowest point in October, and then steadily rises again cyclically according to rainfall. Winter offers a drier, sunnier climate. Although July and August are the driest months, they have some periods of downpours. Sunny days and good weather are common. Rainfall is more abundant here than in Ayacucho, Cusco, or Lima. Iquitos also has microclimates: rain or drizzle may be present in some areas of the districts, while other parts of the city are slightly cloudy or clear. The temperature may vary. The urban climate is slightly warmer than the natural climate, and would be reflected by the thermal sensation. It suffers from a phenomenon called urban heat island, when the city's heat has difficulty dissipating during the night hours due to absorption by buildings and pavement.
The main natural hazard is flooding. In 2012, major flooding occurred in Iquitos who alerted the population and affected coastal areas and several towns in the metropolitan area, which has a floodable, rainy geography. The floods of 2012 were regarded as the most historic natural disaster to Iquitos to date. Wet weather in Loreto took showers and drizzle, causing damage and flooding in the Loreto Region since November 2011. The rainy weather continued until early 2012, and increased the level of water in the Amazon river—wide stream that feeds most of the tributaries in Loreto – up to 117 metres (384 feet). Since February and March, several villages are affected (19,209 and 18,400 families affected), 26 000 hectares of farmland are flooded and the water level reached coastal streets of Iquitos. On 24 April 2012, the spate faded, and initiated the first stage of ebb. Other natural hazards are heat waves where temperatures can reach over 37 °C (99 °F) with a heat index of 45 °C (113 °F) which is caused by the low humidity on clear days. Cold waves are also curious in Iquitos: cold air from the tip of the continent driven by the dynamics of the atmosphere, comes to town and causes a drop in temperature, moderate rainfall and thunderstorms. The trade winds also come to cause gales reaching 60 km/h (37 mph). In October 2012, Iquitos experienced high temperatures and heavy thunderstorms. Earthquakes in the city are very rare and very deep. Iquitos is located in Region 3 of Systematic Regionalization Map of Peru, which means that the city has a low coefficient seismic value, although the 2011 Peru earthquake, which occurred southeast of Contamana, was felt in the city as a small and unexpected jolt.
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