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So changing the temperature of air can change the relative humidity, even when the specific humidity remains constant. Chilling air increases the relative humidity. If the relative humidity rises over 100% (the dew point) and there is an available surface or particle, the water vapour will condense into liquid or ice. Likewise, warming air ...
A given value of relative humidity causes larger increases in the heat index at higher temperatures. For example, at approximately 27 °C (81 °F), the heat index will agree with the actual temperature if the relative humidity is 45%, but at 43 °C (109 °F), any relative-humidity reading above 18% will make the heat index higher than 43 °C. [5]
At fixed latitude, the size of the seasonal difference in sun angle (and thus the seasonal temperature variation) is equal to double the Earth's axial tilt. For example, with an axial tilt is 23°, and at a latitude of 45°, then the summer's peak sun angle is 68° (giving sin(68°) = 93% insolation at the surface), while winter's least sun ...
T a is dry-bulb temperature (°C) RH is relative humidity (%) exp represents the exponential function; The Australian formula includes the important factor of humidity and is somewhat more involved than the simpler North American wind chill model. The North American formula was designed to be applied at low temperatures (as low as −46 °C or ...
A relative humidity of 100% indicates the dew point is equal to the current temperature and that the air is maximally saturated with water. When the moisture content remains constant and temperature increases, relative humidity decreases, but the dew point remains constant.
Schematic of the LCL in relation to the temperature (T) and dew point and their altitude (Z); the moist adiabatic temperature curve above the LCL is also sketched for reference The lifting condensation level or lifted condensation level ( LCL ) is the height at which the relative humidity (RH) of an air parcel will reach 100% with respect to ...
Temperature lag, also known as thermal inertia, is an important factor in diurnal temperature variation. Peak daily temperature generally occurs after noon, as air keeps absorbing net heat for a period of time from morning through noon and some time thereafter. Similarly, minimum daily temperature generally occurs substantially after midnight ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 28 February 2025. Long-term weather pattern of a region For other uses, see Climate (disambiguation). Atmospheric sciences Atmospheric physics Atmospheric dynamics category Atmospheric chemistry category Meteorology Weather category portal Tropical cyclone category Climatology Climate category Climate ...