Chile extends across 38 degrees of latitude along South America's Pacific coast, from the Peruvian border at 17 degrees south to Cape Horn at 56 degrees south. This 4,300-kilometer span creates five distinct climate zones that operate on different seasonal calendars. Northern Chile sits near the Tropic of Capricorn, maintaining moderate temperatures year-round with negligible rainfall. The Central Valley around Santiago experiences Mediterranean seasonality with summer from December through February and winter from June through August. The Lake District and Chilean Patagonia follow southern hemisphere patterns with intensified precipitation and temperature extremes. Easter Island, located 3,700 kilometers west in the Pacific at 27 degrees south latitude, maintains subtropical conditions influenced by oceanic currents. The Andes Mountains create a vertical climate gradient at every latitude, with temperatures dropping approximately 6.5 degrees Celsius per 1,000 meters of elevation gain.
Santiago and the Central Valley receive 80 percent of annual rainfall between May and September, averaging 312 millimeters per year at the capital's elevation of 570 meters. December through February bring daytime temperatures of 28-32 degrees Celsius with less than 5 millimeters of monthly precipitation. January remains the driest month with historical averages near 1 millimeter. July temperatures range from 3-15 degrees Celsius with rain falling on 8-10 days monthly. The Chilean Meteorological Directorate records show frost occurs in Santiago's valley floor 2-4 nights per year, typically in June or July. Valparaíso and the coastal cities maintain narrower temperature ranges due to the cold Humboldt Current, with summer highs of 22-24 degrees and winter lows rarely below 8 degrees. Coastal fog called camanchaca occurs year-round but intensifies from May through August, reducing visibility and creating damp conditions despite minimal rainfall.
The Atacama Desert holds the planetary record for lowest recorded rainfall, with some weather stations near Calama and Antofagasta measuring zero precipitation across decades. Arica recorded 0.76 millimeters average annual rainfall between 1964 and 2001. The city experienced no measurable rain for fourteen consecutive years from October 1903 to January 1918. San Pedro de Atacama at 2,438 meters elevation receives approximately 15 millimeters annually, concentrated in January and February when the Altiplano summer brings afternoon thunderstorms. These high-elevation storms sometimes cause flash flooding in normally dry quebradas. Daytime temperatures in San Pedro range from 22-27 degrees Celsius year-round, but nighttime lows drop to -2 to -8 degrees Celsius from June through August due to clear skies and desert conditions. El Tatio Geysers, located at 4,320 meters elevation 90 kilometers north of San Pedro, experiences dawn temperatures of -10 to -20 degrees Celsius in winter months. The geysers perform most actively between 6 AM and 8 AM when the temperature differential between superheated groundwater and freezing air reaches maximum.
Patagonian weather operates under different atmospheric patterns dominated by the southern westerlies, persistent winds that circle Antarctica and strike Chile's southern coast with minimal continental interference. Punta Arenas at 53 degrees south latitude receives rain or snow on approximately 18-22 days monthly year-round, totaling 380 millimeters annually. Wind speeds average 20-30 kilometers per hour but regularly exceed 60 kilometers per hour during spring months of September through November. The Chilean Meteorological Directorate recorded a gust of 130 kilometers per hour in Punta Arenas on October 12, 2014. Torres del Paine National Park, located 250 kilometers northwest of Punta Arenas, receives approximately 600 millimeters of precipitation annually with snowfall possible in any month. Summer months of December through February bring 16-17 hours of daylight at this latitude, with sunrise occurring around 5 AM and sunset near 10 PM. Winter daylight contracts to 7-8 hours, with June bringing sunrise after 9 AM and sunset before 5 PM.
The Lake District between Temuco and Puerto Montt receives 1,300-2,500 millimeters of precipitation annually, with amounts increasing southward and with elevation. Valdivia records 2,593 millimeters in an average year, making it Chile's rainiest major city. Rain falls on 20-25 days monthly from May through August, decreasing to 8-12 days monthly from December through February. Puerto Montt's winter temperatures range from 2-11 degrees Celsius with persistent cloud cover, while summer brings 10-20 degree temperatures with longer sunny intervals. The nearby volcanoes of Osorno (2,652 meters) and Villarrica (2,847 meters) maintain permanent snowpack above 1,800 meters but receive fresh snow during winter storms that can drop 30-50 centimeters in 24 hours. Skiing operates on these volcanoes from June through October, with snow conditions most reliable in July and August.
Chiloé Island's oceanic climate produces 2,800 millimeters of rain annually in some western coastal areas, distributed across 200-220 days per year. The Chilean Fjords extending from Puerto Montt to the Gulf of Penas receive 3,000-7,000 millimeters annually depending on exposure to prevailing westerlies. Some weather stations in the fjords' western channels record over 8,000 millimeters, comparable to temperate rainforests in New Zealand's Fiordland. These precipitation totals make vessel navigation challenging due to reduced visibility and rough seas, with the austral summer offering marginally better conditions for transit.
Easter Island maintains subtropical maritime conditions with average temperatures of 23 degrees in February and 18 degrees in August. The island receives approximately 1,100 millimeters of rain annually, distributed relatively evenly across months with slight increases from April through June. Trade winds blow consistently from the southeast at 15-25 kilometers per hour. Ocean temperatures surrounding Rapa Nui range from 18 degrees in September to 25 degrees in March, influenced by warm subtropical currents. February through April historically show the lowest rainfall probability, averaging 60-80 millimeters monthly compared to 100-120 millimeters from May through July.
Chile's wine regions in the Central Valley between Aconcagua and Maule provinces conduct harvest during March and April when grapes reach optimal sugar concentrations. The Colchagua Valley and Maipo Valley vineyards near Santiago receive approximately 750 millimeters of annual rainfall, nearly all falling between April and September. Irrigation from Andean snowmelt sustains vines during the dry summer growing season. The Casablanca Valley, located 80 kilometers west of Santiago at elevations of 200-400 meters, benefits from morning fog that extends inland from the Pacific, moderating temperatures for white grape varietals. These fog patterns occur with greatest frequency from December through March.
Andean ski resorts near Santiago including Valle Nevado, La Parva, and Portillo operate from mid-June through early October depending on snowfall. These resorts sit at base elevations of 2,600-2,900 meters with upper lifts reaching 3,600-3,700 meters. Snowfall totals vary considerably between seasons, with strong El Niño years bringing above-average precipitation and La Niña years producing below-average accumulation. The 2015 season recorded only 2.3 meters of total snowfall at Valle Nevado, while the 2017 season measured 7.8 meters. July and August typically provide the most reliable snow coverage with base depths of 1.5-3 meters in average years.
The Carretera Austral, Chile's Route 7 extending 1,240 kilometers from Puerto Montt to Villa O'Higgins, remains passable year-round on paved and gravel sections, but winter conditions from June through August bring snow to higher elevation passes. The road crosses several mountain passes above 1,000 meters where chains or winter tires become necessary. Ferry crossings at Caleta Gonzalo, Fiordo Largo, and Puerto Yungay operate on reduced schedules during winter months. The unpaved southern sections between Cochrane and Villa O'Higgins deteriorate during heavy rains, with some segments becoming impassable without four-wheel-drive vehicles.