Calculate feels-like temperature from heat or wind.
Apparent temperature uses two different physical models depending on conditions. Above about 27 C humidity dominates because it blocks evaporative cooling, so the Rothfusz heat index regression applies. At or below 10 C with wind above roughly 5 km/h, convective heat loss dominates and the wind chill equation applies. Between those bands neither correction is meaningful and the air temperature is what you feel.
Heat index and wind chill
Heat index (F) = -42.379 + 2.049 T + 10.143 RH - 0.2248 T x RH - ... (Rothfusz regression); wind chill (C) = 13.12 + 0.6215 T - 11.37 V^0.16 + 0.3965 T x V^0.16
Sweat cools you by evaporating. In humid air evaporation slows, so heat is retained and the same air temperature feels considerably hotter.
Wind speeds up convective heat loss from exposed skin, which only matters when skin is losing heat. In hot conditions moving air can actually aid cooling.
The feels-like figure, and note which model produced it. Heat index warnings drive hydration and activity limits; wind chill warnings drive frostbite risk.