Decorah weather statistician Richard Bernatz says the last time it rained measurable precipitation in Decorah was June 21st. That places the current dry spell at 19 consecutive days--and counting.
Bernatz has studied the record books and has discovered only three longer stretches without mesurable rain: a 22-day interval from June 27th to July 18th in 1894; a 37-day interval from June 5th to July 11th in 1910; and a stretch from July 1st to August 31st in 1948 that lasted for an amazing 62 days.
The next possible chance of measurable rain in Decorah is this Saturday.