The climate in the Central and Western Highlands is generally mild. It can get cool at night even in the summers, especially at the higher altitudes.
El Petén and the Pacific Coast are tropically hot and steamy.
It is difficult to travel in the more remote areas during the rainy season between mid-May and mid-October into mid-November in the north.
The months of March and April are very hot especially in the low lying areas such as the Pacific coastal plain.
The first evidence of human settlers in Guatemala goes back to at least 18,000 BC. Sites dating back to 6500 BC have been found in Quiché in the Central Highlands and Sipacate, Escuintla on the central Pacific coast. Archaeologists divide the pre-Columbian history of Mesoamerica into the Pre-Classic period 2000 BC to 250 AD.El Mirador was by far the most populated city in pre-Columbian America. Both the El Tigre and Monos pyramids encompass a volume greater than 250,000 cubic meters. Mirador was the first politically organized state in America.
The Classic period of Mesoamerican civilization corresponds to the height of the Maya civilization, and is represented by countless sites throughout Guatemala, although the largest concentration is in Petén. This period is characterized by heavy city-building, the development of independent city-states, and contact with other Mesoamerican cultures. This lasted until around 900 AD, when the Classic Maya civilization collapsed. The Maya abandoned many of the cities of the central lowlands or were killed off by a drought-induced famine. The Post-Classic period is represented by regional kingdoms such as the Itzá and Ko'woj in the lakes area in Petén, and the Mam, Ki'ch'es, Kack'chiquel, Tz'utuh'il, Pokom'chí, Kek'chi and Chortí in the Highlands. These cities preserved many aspects of Mayan culture, but would never equal the size or power of the Classic cities.
After arriving in what was named the New World, the Spanish mounted several expeditions to Guatemala, beginning in 1519. Before long, Spanish contact resulted in an epidemic that devastated native populations. During the colonial period, Guatemala was an Audiencia and a Captaincy General of Spain, and a part of New Spain Mexico. It extended from the modern Mexican states of Tabasco and Chiapas to Costa Rica. This region was not as rich in minerals gold and silver as Mexico and Peru, and was therefore not considered to be as important. Its main products were sugarcane, cocoa, blue añil dye, red dye from cochineal insects, and precious woods used in artwork for churches and palaces in Spain.
On September 15, 1821, the Captaincy-general of Guatemala formed by Chiapas, Guatemala, El Salvador, Nicaragua, Costa Rica, and Honduras officially proclaimed its independence from Spain and its incorporation into the Mexican Empire, which was dissolved two years later. The Guatemalan provinces formed the United Provinces of Central America, which dissolved by 1840, resulting in Guatemala being an independent nation. Guatemala's "Liberal Revolution" came in 1871 under the leadership of Justo Rufino Barrios, who worked to modernize the country, improve trade, and introduce new crops and manufacturing. During this era coffee became an important crop for Guatemala. Barrios had ambitions of reuniting Central America and took the country to war in an unsuccessful attempt to attain this, losing his life on the battlefield in 1885 against forces in El Salvador. From 1898 to 1920, Guatemala was ruled by the dictator Manuel Estrada Cabrera, whose access to the presidency was helped by the United Fruit Company.
On 4 July 1944, dictator Jorge Ubico Castañeda was forced to resign his office in response to a wave of protests and a general strike, and from then until the end of a murderous civil war in 1996, Guatemala was subject to a series of coups with massive attendant civil rights abuses. State-sponsored murders of students, human rights activists and the ethnic Mayan peoples, gained Guatemala a terrible reputation around the world. In 1999, US president Bill Clinton stated that the United States was wrong to have provided support to Guatemalan military forces that took part in the brutal civilian killings.
Since the peace accords in 1996, Guatemala has witnessed successive democratic elections, most recently in 2007 when The National Unity of Hope and its president candidate Álvaro Colom won the presidency as well as the majority of the seats in congress.