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Tuesday April 15, 2008 at 11:28 am
Enjoy the Lack of Humidity
posted by Adam Caskey: Meteorologist


There are many reasons to look forward to springtime in the DC area, but what I appreciate the most is the lack of humidity and haze.  As we all know, the heat and humidity make summertime weather oppressively sweaty and uncomfortable, and as early as late May, the humidity can rear it's ugly head.  This is why it's important to make the most of the mild Spring days before the humidity makes its annual surge northward from the Gulf of Mexico, and our air conditioning bills sky rocket, or course. 

High temperatures this week will slowly climb to near 80 degrees by Friday, and dewpoints will only rise into the upper 40s with our springtime, southerly flow.  For those not familiar, the dewpoint is the temperature the air must be cooled to in order to become saturated (100% relative humidity).  It is all you need to look at to determine how much moisture is in the air, and to figure out how comfortable or uncomfortable the day will be.  Normally, once the dewpoint is in the 50s, you begin to feel a touch of humidity, but it's not uncomfortable.  Dewpoints in the upper 60s and especially lower 70s are uncomfortable, and to some, unbearable.  In the summertime our dewpoint is most often in the 60s and lower 70s, so there is more moisture in the air causing it to feel hotter outside.  Also, without the added moisture in our air this time of year, we have baby blue skies rather than the hazy, blueish-white skies common in the summertime.

I understand comfort is all relative as I'd rather be too cold than too hot while others would like it the other way around, so it all comes down to personal preference.  Regardless, enjoy the lack of humidity & bright, blue skies and look forward to another month or so of conditions we will yearn for during the sultry summer, which is inevitably just around the corner. 

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