Mt Pinatubo eruption made 1992 the coolest year since 1986 02 surface Temperature changes -0.4 0.6 Pinatubo 1992 1993 Red line: modeled temperature changes Blue line: temperature changes observed from meteorological ground stationsMt. Pinatubo eruption made 1992 the coolest year since 1986 Red line: modeled temperature changes Blue line: temperature changes observed from meteorological ground stations