Note: Certification of an interlocutory decision by a trial court allows an appellate court to review the decision and to answer a controlling question of law. Certification is often used in state courts as well as federal courts and, where available, allows a federal court to refer a question of state law to the state's highest court. Certification is also used to refer to a judge's order that allows a suit to be maintained as a class action.
1 The average temperature in Santiago in December is somewhat warm at 19.2 Â°C (66.56 Â°F).  Afternoons can be very hot with average high temperatures reaching 28 Â°C (82.4 Â°F).
Average Weather in Santiago Chile. In Santiago, the summers are long, warm, arid, and clear and the winters are cold and partly cloudy. Over the course of the year, the temperature typically varies from 38Â°F to 86Â°F and is rarely below 30Â°F or above 91Â°F. The hot season lasts for 4.0 months, from November 24 to March 23, with an average daily high temperature above 81Â°F. The hottest day of the year is January 16, with an average high of 86Â°F and low of 57Â°F. The cool season lasts for 3.3 months, from May 21 to August 31, with an average daily high temperature below 65Â°F.