It reached this maximum extent unusually early, as the hole is normally largest in late September. Minimum ozone values were measured in early October and were amongst the lowest on record. The edge of the ozone hole passed over the tip of South America and the Falkland Islands for significant periods between October 6 and 24. The hole also closed in unusually early and the event was essentially over by early December. The 100 hPa temperature is close to the normal at Halley, having been a few degrees below the normal from early December to mid March.
Satellite imagery gives a global perspective on the ozone hole.
TOMS values are close to ground-based values. Stratospheric clouds were sighted from Vernadsky, Rothera and Halley during the late winter and early spring. This HRPT infra-red satellite image from Rothera shows dense clouds west of Rothera. A mini ozone hole, with central values below 200 DU, periodically formed to the east of the Antarctic Peninsula over the Weddell Sea during July. This mini ozone hole probably formed due to processing of ozone through PSCs, which are far enough north to be sunlit.