The interconnection between weather and climate
and the performance, well-being, and human health cannot
be overemphasized. The relationship between them is of
both local and global significance. Information about weather,
climate, and thermal environment is very important to
human health and medical practitioners. The most crucial
environmental information needed by medical practitioners
and for maintaining human health, performance, and wellbeing
are thermal conditions. The study used meteorological
variables: air temperature, relative humidity, wind speed,
solar radiation, and RayMan model as an analytical tool to
compute physiologically equivalent temperature (PET) in
order to assess thermo-physiological thresholds in Ondo
State. The study revealed that there are marked spatial and
seasonal variations in the environmental thermal conditions
in the study area. The results of physiologically equivalent
temperature for different grades of thermal sensation and
physiological stress on human beings indicate that about
60 % of the total study period (1998–2008) fall under
physiological stress level of moderate heat stress (PET 31–
36 °C). In derived savannah, 32.6 % out of the total study
period was under strong heat stress. In view of this, the
study concluded that Ondo State may likely be prone to
heat-related ailments and that some of the death recorded in
the State, in recent times, may be heat-related mortality, but
this is difficult to ascertain because there is no postmortem
records in Nigeria where it could be confirmed. This type of
study is relevant to help government to improve health care
interventions and achieve Millennium Development Goals
in health sector.