Increased humidity decreases the environmental survival rate of coronaviruses
The effect of humidity on the environmental survival of coronaviruses remains contested, with some studies showing that increased humidity and temperature reduce viral viability, while others indicate that survival rates vary non-linearly or depend heavily on surface matrices and absolute humidity.
The claim posits a straightforward inverse relationship between humidity and coronavirus survival. While early laboratory studies on SARS-CoV and recent work with animal models (e.g., Chan et al. 2011; hamster models in 2025) support the idea that higher temperature and humidity can decrease viral survival, other recent experimental studies (e.g., on feline coronavirus in 2023 and surrogate coronaviruses in artificial bodily fluids in 2025) demonstrate U-shaped or complex dependencies where high humidity can preserve certain viral forms or where intermediate humidity yields the lowest survival. Therefore, the evidence is mixed rather than uniformly supportive, leading to a CONTESTED verdict.
K. Chan, J. Peiris, Siu Yan Lam, L. Poon, K. Yuen, W. Seto. The Effects of Temperature and Relative Humidity on the Viability of the SARS Coronavirus. 2011. https://doi.org/10.1155/2011/734690
Chan et al. (2011) found that higher relative humidity combined with higher temperature led to rapid loss of viability for SARS-CoV.
Janina Reissner, Paul Siller, A. Bartel, U. Roesler, A. Friese. Stability of Feline Coronavirus in aerosols and dried in organic matrices on surfaces at various environmental conditions. 2023. https://doi.org/10.1038/s41598-023-49361-1
Research on Feline Coronavirus (2023) demonstrated higher airborne stability at both low and high relative humidity, with medium relative humidity causing the greatest loss of infectivity.
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L. Guo, Z. Yang, L. Zhang, S. Wang, T. Bai, Y. Xiang, E. Long. Systematic review of the effects of environmental factors on virus inactivation: implications for coronavirus disease 2019. 2021. https://doi.org/10.1007/s13762-021-03495-9
A systematic review by the authors of (2021) indicated that virus survival and transmission is reduced at intermediate relative humidity but can be complex, though dry conditions aid some survival.
Zhang C, Guo Z. The impact of temperature and relative humidity on SARS-CoV-2 airborne transmission in Syrian hamsters.. 2025. https://doi.org/10.1128/spectrum.00979-25
A study using Syrian hamsters (2025) found that airborne transmission and viral survival were moderately reduced under high temperature and high relative humidity conditions.
Furin W, Tran-Basha L, Yancey O, Edwards J, Edwards M, Whitworth C, Park GW. Infectivity duration of HCoV-OC43, a surrogate for SARS-CoV-2, in artificial bodily fluids on stainless steel simulating common nonporous surfaces.. 2025. https://doi.org/10.1128/spectrum.01690-24
A study on surrogate coronavirus OC43 survival on surfaces (2025) found prolonged infectivity at higher absolute humidity levels depending on organic matrix composition.
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