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“Throughout human history,” notes Days of the Year.com, “people and cultures all over the world have celebrated rain and its life-giving power.” We did so in this space 4 months ago in honor of March being National Umbrella Month …

… and today is once again time to hail the rain. (Sorry, that was pour.)

Scientifically speaking, rain is “liquid water in the form of droplets that have condensed from atmospheric water vapor and then precipitated”—a word that literally means falling under gravity. This pair of natural beauties proves that "falling under gravity" is something they’ve too often mist in Silicone Valley.

“All life is dependent on rain,” notes one researcher, “and it is what keeps our world green, fresh and beautiful. Rain is no less important today than it has been in the past, and now people have NationalRain Day, a chance to celebrate all things wet and wonderful.” Could anything be slicker than this drenched duo?

The celebration began in tiny Waynesburg, Pennsylvania in the late 1800s, when a local farmer remarked to pharmacist William Allison that “it always seems to rain on July 29th.” The comment inspired Allison to keep an annual record of the rainfall on that day … and by gosh, it usually did (being dry only 15 times in the first 108 years)!

By the 1960s, Waynesburg decided to hold a special celebration on July 29th each year … and mount a beautypageant to elect Miss Rain Day. The overflow crowd has remained the same {that’s the 1964 event, below left} but the contestants and their costumes certainly make more of a splash a half century later (below right).

In the early 1930s, word leaked out about Waynesburg’s wet weather … and newspapers and radio stations began flooding the town with reporters “to learn if it had indeed rained” on 7/29. Thus, the holiday spread nationally. As the official festival press release notes: “July 29th, Rain Day in Waynesburg, is the only holiday anywhere in the world that is not a success unless it rains!”

And it’s apparently taken the libido by storm: “There are very few things more sensual than rain,” writes Luxury Standard. “The feeling of rain falling on your skin is one that is very unique and even a shower can’t duplicate the sensation.” Though a cold shower might be called for about now …

“Hey, if rain weren’t so damn hot,” the writer continues, “there wouldn’t be so many people wanting to have sex in it”—indeed, doing it in a downpour seems to be on many a bucket list.

“And there certainly wouldn’t be so many damn songs about the wonderfully wet substance.” Just off the top of Sleuth’s head there’s a bit of a torrent of records relating to cloudbursts—from Milli Vanilli’s mouthed Blame It on the Rain to the Eurythmics’ Here Comes the Rain Again; Herb Alpert’s Making Love in the Rain {vocals by Janet Jackson}; and of course, the late great Prince’s Purple Rain.

Even country Kenny Chesney—whose 2005 marriage to actress Renee Zellweger was annulled by her after just four months for what she claimed was ‘fraud’—had a huge hit later that same year with the ballad There’s Something Sexy About the Rain. Its opening lyrics hint at his inexperience: “In a field of sugarcane/She taught me how and showed me why.” Neither has ever remarried.

“Whether it is morning, evening or night,” notes writer Tracy Lashley, “I’m always amazed at the way Facebook, Twitter and BBM (BlackBerry Messenger) statuses are updated to: ‘Weather for leather’ or ‘Weather for 20 toes, no clothes, and all kinda pose’ as soon as it begins to rain. What is it about this weather that gives people this warm, fuzzy feeling to have sex?”

Or inspires a deluge of ‘click bait’ lists:

“Most of the girls I spoke with about this had no idea why rain called for lovemaking,” Lashley reports. “It was like an automatic response, ‘Rain equals sex.’ One girl told me that guys just get horny when it rains.”

Well, it does require lovers to get between the sheets.

Whatever the reason, ’tis the season … so prepare to be pelted with babes unbelted …

… as we improve your visibility with Sleuth’s Top Ten ‘Moistest and Choicest’ celebs becoming wet. And in case you take a dim view, we didn’t sprinkle in any from the Cloud

ADRIANA LIMA

JENNIFER LOPEZ

JANE SEYMOUR

MARION COTILLARD

JENNIFER BEALS

BAR REFAELI

KATHARINE McPHEE

Runner-up to American Idol Season 5 winner Taylor Hicks, she’s since had her hand in more pilots than an Air Force proctologist! “I was prematurely developed,” she says, “as a high school freshman I had boobs.” Later Kathy insisted: “I really don’t show that much skin. It’s all suggested.” We get her point

LARA STONE

ELIZABETH DEBICKI

Held the umbrella for Leonardo at Cannes … then held us spellbound by showing her can in The Night Manager. Why there wasn’t a dry thigh in the house!

KATY PERRY

A reader recently expressed ‘surprise’ that Sleuth didn’t include the singer’s slip at a water park in a recent blog for National Butt Crack Day … but he felt this was more of a full fallout than a mere crack attack.

B•sides, he wanted to hold it back to be the perfect END to our precip trip!

Perhaps you’ll want to save this for a … (well, you know).