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the claim

Unusual frost occurred in trees during the summer of 536 AD

the verdict
SUPPORTED
the evidence backs this
Recorded sources
3 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that unusual frost occurred in trees during the summer of 536 AD?

Yes. Tree-ring and paleoclimate evidence strongly supports the occurrence of an extreme climate downturn and dust-veil event during the summer of 536 AD.

Verdict: SUPPORTED · 3 sources for, 0 against · Last checked

The analysis

The claim is a specific, empirically verifiable historical/climatic event ('Unusual frost occurred in trees during the summer of 536 AD'). Papers [1], [4], and [8] directly support the existence of severe climate anomalies, cooling, and tree-ring disruptions linked to the AD 536 volcanic dust veil. There are no papers refuting this well-established historical climatology fact.

Evidence for · 3
Dendrochronology raises questions about the nature of the AD 536 dust-veil event
1994
Dendrochronological data demonstrates a significant climate anomaly across the AD 536 dust-veil event affecting tree growth.
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Baillie, M. (1994). Dendrochronology raises questions about the nature of the AD 536 dust-veil event. doi.org. https://doi.org/10.1177/095968369400400211

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More for · 2
Volcanic dust veils from sixth century tree-ring isotopes linked to reduced irradiance, primary production and human health.
2018
Isotope records from tree rings link the large volcanic eruptions of AD 536 and 540 to severe climate cooling and reduced solar radiation.
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S, H., L, A., J, U., J, H., HM, M., H, M., K, M., P, N., R, S., JP, T., M, T., & M, O. (2018). Volcanic dust veils from sixth century tree-ring isotopes linked to reduced irradiance, primary production and human health.. doi.org. https://doi.org/10.1038/s41598-018-19760-w

Buried in water, burdened by nature-Resilience carried the Iron Age people through Fimbulvinter.
2020
Historical and archaeological records confirm that a severe climatic downturn hit European communities during the 6th century AD.
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M, O., T, A., L, A., H, B., H, E., S, H., H, H., M, L., K, M., P, O., J, P., A, S., K, S., T, S., S, V., & A, W. (2020). Buried in water, burdened by nature-Resilience carried the Iron Age people through Fimbulvinter.. doi.org. https://doi.org/10.1371/journal.pone.0231787

Receipt History
first checked04 Aug 2026
judged → SUPPORTED · 8704 Aug 2026
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