The eruption had a noticeable impact on growth conditions in the Northern Hemisphere, which were the worst of the last 600 years, with summers being on average colder than the mean. The climate impact has been noted in the growth rings of a centuries-old ocean quahog (a mollusc) individual that was found somewhere in Iceland, as well as in tree rings from Taiwan, eastern Tibet, the Urals and Yamal Peninsula in Russia, Canada, the Sierra Nevada and White Mountains both in California and Lake Zaysan in Kazakhstan. Notably, the climate impacts became manifest only in 1601; perhaps in 1600 they were suppressed by a strong El Niño event.