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en.wikipedia.org/wiki/Relative_humidity

Relative humidity (RH) is the ratio of the partial pressure of water vapor to the equilibrium vapor pressure of water at a given temperature. Relative humidity depends on temperature and the pressure of the system of interest. The same amount of water vapor results in higher relative humidity in cool air than warm air.

science.howstuffworks.com/nature/climate-weather/...

Relative humidity is the ratio of the current absolute humidity to the highest possible absolute humidity (which depends on the current air temperature). A reading of 100 percent relative humidity means that the air is totally saturated with water vapor and cannot hold any more, creating the possibility of rain.

en.wikipedia.org/wiki/Humidity

Relative humidity is normally expressed as a percentage; a higher percentage means that the air-water mixture is more humid. Relative humidity is an important metric used in weather forecasts and reports, as it is an indicator of the likelihood of precipitation, dew, or fog.

www.quora.com/When-is-relative-humidity-the-highest

In general, Relative humidity (Rh) is inversely related to air temperature, that’s why we will get maximum relative humidity at 5:30 am and minimum at 2:30 pm during the day, because during the day, the maximum and minimum temperatures at 2:30 pm and 5:30 am respectively.

geog.ucsb.edu/ideas/Humidity.html

-Humidity is highest closest to the ground.-Air temperature is the dominant control on relative humidity, and relative humidity is typically at its highest during cold nights.-Relative humidity is then at its lowest during mid day when it is the hottest outside.

answers.yahoo.com/question/index?qid=20091119124708AASuVzv

Best Answer: The relative humidity is highest when the air temperature is closest to the dewpoint temperature. That is typically in the early morning, when the air is normally the coolest. Recall that the dewpoint temperature is the temperature in which the air must be cooled to attain saturation without changing the water vapor content of that air.

molekule.com/blog/what-is-relative-humidity

When relative humidity gets too high, usually above 50%, mold and mildew growth and trapped allergens become more likely which, in turn, may cause allergy and asthma symptoms to appear. When you’re trying to figure out how to make the air in your home healthy, relative humidity is an important factor to consider.

www.fondriest.com/news/relativehumidity.htm

Relative humidity is a measure of the amount of moisture in the air relative to the total amount of moisture the air can hold. For instance, if the relative humidity was 50%, then the air is only half saturated with moisture. Warmer air can hold more moisture than colder air.

www.reference.com/science/highest-humidity-ever-recorded-5...

The highest humidity ever recorded was a 95 degrees Fahrenheit dew point in Saudi Arabia in 2003. The dew point is correlated with relative humidity; theoretically, humidity could reach saturation at 100 percent and there is no higher percentage that humidity could possibly reach.

www.currentresults.com/Weather/US/annual-average-humidity...

The average humidity during the year is listed here for each state in the United States. The tables give annual averages for morning and afternoon relative humidity levels. For each state, the Morning values are recorded between 4 and 6 am local standard time, when usually temperatures are coolest and humidity highest.