July 11, 2011
The clip, which was one of the most-viewed of 2010, has been seen nearly 30 million times since then. Even now, a year later, it's still viewed close to 100,000 times per week.
Here's a graph of its popularity in 2010:
(May take a moment to load in full.)
Today, there are over 10,000 "double rainbow-"related videos on YouTube. Some of them are funny spoofs, and some are just clips of other double rainbows captured by those fortunate enough to have witnessed one. (One of the most famous post-double rainbow double rainbows came in the wake of the disastrous tornado that tore through Joplin, Missouri.)
Vasquez has continued to post videos of his daily exploits, and uploaded this one on Thursday to mark the occasion: