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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]
When the temperature is 30 °C (86 °F) and the dew point is 15 °C (59 °F), the humidex is 34. If the temperature remains 30 °C (86 °F) and the dew point rises to 25 °C (77 °F), the humidex rises to 42. The humidex is higher than the U.S. heat index at equal temperature and relative humidity. The humidex formula is as follows: [7] [8]
The AT index used here is based on a mathematical model of an adult, walking outdoors, in the shade (Steadman 1994). The AT is defined as the temperature, at the reference humidity level, producing the same amount of discomfort as that experienced under the current ambient temperature and humidity. [6] The formula [7] is:
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This is a list of cities by average temperature (monthly and yearly). The temperatures listed are averages of the daily highs and lows. Thus, the actual daytime temperature in a given month may be considerably higher than the temperature listed here, depending on how large the difference between daily highs and lows is.
What temperature should I set my a/c to in an Oklahoma summer? Turning your thermostat down by 10 or even 15 degrees while asleep or away can save up to 10 percent on your heating bills.
These measurements reflect averages over a large region and so are lower than the maximum point surface temperature. [ 6 ] Satellite measurements of the surface temperature of Antarctica, taken between 1982 and 2013, found a coldest temperature of −93.2 °C (−135.8 °F) on 10 August 2010, at 81°48′S 59°18′E / 81.8°S 59.3°E ...
The value of relative humidity results in a heat index higher than the actual temperature. [9] The highest temperature ever recorded at George Bush Intercontinental Airport was 109 °F (43 °C) on four occasions: September 4, 2000; [ 10 ] August 27, 2011; August 24, 2023; and August 27, 2023. [ 11 ]