Chajnantor Precipitable Water Vapor (PWV) Seasonal Trends #1897191 (License: Personal Use)

This area chart displays the seasonal cycle of precipitable water vapor (PWV) at the Chajnantor plateau in Chile, with data segmented into 25th, 50th, and 75th quartiles. PWV drops sharply from March through August, reaching a minimum around July (≈0.5 mm), then rises steeply toward December. The high-altitude site’s dry conditions make it optimal for radio and submillimeter telescopes like ALMA.

Used in astronomical observatory documentation, climate studies, or telescope proposal support materials; targets researchers, engineers, and science communicators seeking atmospheric transparency data for site selection or observation planning.