February 22 is National Margarita Day.  Don your goggles and gloves.

Not May 5? Or in addition to May 5?

Ghost peppers are spicy, right?

Not May 5.

http://nationalmargaritaday.com/

Ghost peppers are the hottest!

http://www.pepperscale.com/ghost-pepper-vs-habanero/

I wonder why they chose February.

Hot peppers in February makes more sense. 

Two questions: Why tequila under a year old and why such spicy peppers?

Ingredients

• 9 oz reposado (that’s a tequila that’s been aged between 2-12 months) tequila
• 6 oz fresh lime juice (yes, limes are out of season in all but Florida right now, but don’t you dare use that bottled stuff)
• 6 oz agave nectar
• 12 oz hot water
• 8 oz water
• Handful of ghost peppers, diced (If you’re afraid of the heat, take out the seeds—but really, if you’re afraid of the heat, this isn’t the drink for you)

1. Or rather tequila more than 2 months old (AND less than a year)

With 100% agave tequila, blanco or plata is harsher with the bold flavors of the distilled agave up front, while reposado and añejo are smoother, subtler, and more complex. As with other spirits aged in casks, tequila takes on the flavors of the wood, while the harshness of the alcohol mellows. The major flavor distinction with 100% agave tequila is the base ingredient, which is more vegetal than grain spirits (and often more complex).

2. February being a very cold month in the U.S., the pepper is an effective warming agent.

So it's a mellow drink for a cold month?

The hot pepper helps but I think I'd still prefer a warm drink rather than one on ice. 

Like this?

http://cocktails.about.com/od/atozcocktailrecipes/r/ht_btrd_rum_ckt.htm

Now you're talking! When is National Hot Buttered Rum Day?