The higher the dew point is, the more moisture that is in the air. Now that you know the formulas for dew point and humidity, you may wonder, what is the difference between those two terms?ĭew point is an accurate measurement of the moisture content in the air. humidity: the difference between dew point and humidity The result appears in no time! Dew point vs. Or, simply type the values into our dew point calculator (you can also use the relative humidity calculator). If you want to calculate relative humidity, you need to know the dew point and temperature to use the equation derived from the above formula. As recommended by Alduchov and Eskridge, the value of these are: a = 17.625 and b = 243.04 ☌ and

RH - Relative humidity of the air (in percent).

The dew point is calculated according to the following formula: Lawrence from 2005) that allows us to obtain accurate results (with an uncertainty of 0.35 ☌) for temperatures ranging from -40 ☌ to 50 ☌. This dew point calculator uses the Magnus-Tetens formula ( based on the article by Mark G. Many equations describing this relationship have been formed. It is merely the water content in the air, expressed in grams per cubic meter:Ībsolute humidity = m / V, where m is the mass of water vapor, and V is the volume of the air and water vapor mixture.įor saturated air at 30 ☌ (86 ☏), the absolute humidity in the atmosphere ranges from ~0 to 30 grams per cubic meter.ĭid you notice that the formulas don't take the temperature into consideration? How to calculate dew point? How to calculate relative humidity? To understand this definition, you also need to know the meaning of absolute humidity. Or, expressed differently, the relative humidity is the ratio of the water vapor pressure Pw to the saturation water vapor pressure Pws at the given temperature: Relative humidity = 100% × current absolute humidity / max absolute humidity In other words, it's the amount of moisture in the air compared to what the air can maximally 'hold' at that temperature: It is the ratio of the current absolute humidity to the maximum absolute humidity possible for the current temperature. The sky will likely remain partly to mostly cloudy with a 20% chance for a stray shower or storm.Relative humidity is expressed as a percentage. If you have any evening plans, we will likely see temperatures cool into the mid to upper 70s at 7 p.m. Remember that when thunder roars, go indoors. If a storm develops, it will be capable of producing heavy rainfall, gusty winds, and lightning. We will hold on to a 20% chance for isolated storms to develop this afternoon and evening.

If you plan on being outside, just make sure you monitor the WBRC First Alert Weather App. It will end up feeling a little muggy outside, so it may feel a few degrees warmer. Winds will likely come from the southwest at 5-10 mph.

High temperatures are forecast to warm into the low to mid 80s.

We will likely go into the afternoon mostly dry with a partly to mostly cloudy sky. Temperatures have already warmed into the upper 70s and lower 80s shortly around noon. The good news is that most of that activity has come to an end as we approach the afternoon hours.

( WBRC) - We started out the morning with patchy fog in west Alabama and a few showers in east Alabama.

Current dew point