Title: Climate of Venezuela
Content:  The Climate of Venezuela is characterized for being tropical and isothermal as a result of its geographical location near the Equator, but because of the topography and the dominant wind direction, several climatic types occur which can be the same as found in temperate latitudes, and even polar regions. Latitude exerts little influence on the Venezuelan While the coastal cities of Maracaibo, Barcelona, Porlamar and Maiquetia can get extremely hot, cities located at valleys such as Mérida, Caracas, Los Teques and San Cristobal have cooler climates, and the highest towns of Mucuchies and Apartaderos have cold (tundra) climates. The hottest part of Venezuela is the northwest (Paraguana Peninsula and Guajira Peninsula), 
Title: Venezuela
Content:   Venezuela is entirely located in the tropics over the Equator to around 12° N. Its climate varies from humid low-elevation plains, where average annual temperatures range as high as 35 °C, to glaciers and highlands (the páramos) with an average yearly temperature of 8 °C. Annual rainfall varies from 430 mm in the semiarid portions of the northwest to over 1000 mm in the Orinoco Delta of the far east and the Amazonian Jungle in the south. The precipitation level is lower in the period from August through April. These periods are referred to as hot-humid and cold-dry seasons. Another characteristic 
Title: Climate of Venezuela
Content:  This climate is characterized by very hot temperatures above 26 °C, with precipitations that ranges from dry (less than 300 mm) to pluvial (more than 3300 mm) conditions. This climate can be found in areas below 300 m in sedimentary basins and lowlands such as the Llanos, Orinoco Delta, Maracaibo Basin, Orinoco Basin, and coastal plains and islands; it comprises almost all the country. This climate zone is present in cities like Maracaibo, Punto Fijo, Ciudad Guayana, Porlamar, Puerto La Cruz, Barinas, Tucupita, Cumaná, Maturin, Anaco, Ciudad Bolívar, Cabimas, El Vigía and others.
Title: Climate of Venezuela
Content: Hot desert climate (BWh) Hot semi-arid climate (BSh) Cold semi-arid (BSk) This type of climate the evaporation exceeds precipitation. In Venezuela is typical of desert and arid coastal areas and with annual temperatures above 18 °C. The cold semiarid type can be found at elevated portions of the Andes. It can be found in Guajira Peninsula, Paraguana Peninsula, Araya Peninsula and most of the Insular region. It is located in the northern part of Zulia state, most of the area of Lara state and Falcón state, the coastal area, Insular region and some semi-arid areas in Venezuelan Andes. It can be found locked at the temperate zones of high Andean valleys of Cordillera de Mérida.
Title: Climate of Venezuela
Content:  Venezuelan climates are structured in "thermal floors", as mentioned next:
Title: Climate of Venezuela
Content: Tropical savanna climate (Aw) Tropical monsoon climate (Am) Tropical rainforest climate (Af) It's the most prevalent and characteristic climate of the country. Maintaining temperatures above 18 °C and rainfall in most of the year: It can be found throughout the country, dominating the Llanos and northern Guayana Region, as well as other parts of the country. It is dry between December and March with annual rainfall between 600 and 1,500 mm. It is located in the Guayana Region, Orinoco Delta, west of Zulia, Andean and Coastal range foothills, Paria Peninsula and Barlovento region; with rainfall between 1,600 and 2,500 mm per year and a drought of just 45 days. It's located south of Venezuela, Orinoco Delta, El Tamá area in west of Venezuela, and south of Maracaibo Lake. Rainfall exceeds 2,500 mm, not tending dry season.
Title: Climate of Venezuela
Content:  This climate is characterized by average temperatures below 0 °C all year, it's located in the highest peaks of Venezuela in the Cordillera de Mérida such as Pico Bolívar, Pico Humboldt, Pico La Concha, Pico Bonpland, Pico Espejo, Pico Mucuñuque and Pico Piedras Blancas. Only Pico Bolivar and Pico Humboldt have their glaciers preserved, while the other peaks are exposed to nival zone conditions.
Title: Geography of Venezuela
Content:  Although the country lies wholly within the tropics, its climate varies from tropical humid to alpine, depending on the elevation, topography, and the direction and intensity of prevailing winds. Seasonal variations are marked less by temperature than by rainfall. Most of the country has a distinct rainy season; the rainy period (May through November) is commonly referred to as winter and the remainder of the year as summer. Average yearly rainfall amounts in the lowlands and plains range from an arid 180 mm in the Paraguaná Peninsula – the driest part of South America outside the Arid Diagonal – to around 1000 mm in the Orinoco Delta and 2200 mm or more in Los Llanos and Amazonas. Rainfall in mountainous areas varies considerably; sheltered valleys receive little 
Title: Climate of Venezuela
Content:  This climate is characterized by temperatures above 8 °C and below 13 °C, with precipitations that ranges from scarcely rainy (300 – 700 mm) to pluvial (more than 3300 mm) conditions. This climate can be found in mountainous areas around 2,400 to 3,200 m specifically in Sierra de Perija, Cordillera de Mérida, higher elevations at Venezuelan Coastal Range and higher tepuis (Monte Roraima, Kukenan, Cerro Marahuaca, Chimantá Massif). This climate zone is present in towns like Mucuchíes, Chachopo and Los Nevados.
Title: Climate of Venezuela
Content:  This climate can be found in the Venezuelan Andes area, between 3,200 and 4,150 m. It's characterized by temperatures from 3 °C to 8 °C and precipitations that ranges from scarcely rainy (300 – 700 mm) to rainy (1800–2500 mm) conditions. This climate zone is present in towns like Apartaderos and Llano del Hato. The condition of this climate is also known as páramo

Question: what is the biggest determinant of climate in venezuela?
Answer: altitude.