Search results
Results From The WOW.Com Content Network
The heat index (HI) is an index that combines air temperature and relative humidity, in shaded areas, to posit a human-perceived equivalent temperature, as how hot it would feel if the humidity were some other value in the shade. For example, when the temperature is 32 °C (90 °F) with 70% relative humidity, the heat index is 41 °C (106 °F ...
In a recent study, [13] researchers from 63 countries combined 30-minutes rainfall data in order to estimate the global rainfall erosivity (an index combining the amount, frequency and intensity of rainfall). The arid and cold climate zones have very low number of erosive events.
Various factors affect the average state of the atmosphere at a particular location. For instance, midlatitudes will have a pronounced seasonal cycle of temperature whereas tropical regions show little variation of temperature over a year. [20] Another major variable of climate is continentality: the distance to major water bodies such as oceans.
The climate of a location is affected by its latitude, longitude, terrain, altitude, land use and nearby water bodies and their currents. [3] Climates can be classified according to the average and typical variables, most commonly temperature and precipitation. The most widely used classification scheme is the Köppen climate classification.
The numerical index is based on an overall interpretation of the available documentary evidence indicating the temperature or precipitation conditions of a particular month or season. The so-called Pfister index is the most widely used temperature and precipitation index. [4]
For example, according to the heat index, a relative humidity of 75% at air temperature of 80.0 °F (26.7 °C) would feel like 83.6 ± 1.3 °F (28.7 ± 0.7 °C). [ 13 ] [ 14 ] Relative humidity is also a key metric used to evaluate when it is appropriate to install flooring over a concrete slab.
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 ...
American Samoa's climate regime is dominated by southeast trade winds. The island dependency is wet, with annual rainfall averaging near 120 inches (3,000 mm) at the airport, with amounts closer to 200 inches (5,100 mm) in other areas. [77] There is a distinct rainy season when tropical cyclones occasionally visit between November and April.