There is no good evidence to support a significant dependence on
season or weather. The evidence we have is consistent with the
null hypothesis:
-- In the very tropical and warm nation of Malaysia, the disease is
prevalent and rapidly spreading, despite sweeping public health
measures including a lockdown.
-- The closely-related MERS virus didn't seem to mind warm weather.
-- The not-so-closely related coronaviruses that cause the common
cold are somewhat less of a problem in the summer, but only
somewhat, and nobody knows why.
Claims of a strong dependence on season or weather appear to
be based on politics and wishful thinking. That brings to
mind a proverb for our times: