No chance of getting bored in Iowa if you like the outdoors. For the period of the summer at Comet Trail highs are frequently in the 80's while nighttime lows are ordinarily in the 60's. The wintertime brings highs down to the 20's, and winter nights come with lows in the 0's to Comet Trail. The amount of rainfall that falls at Comet Trail is close to the national average. The month of June is the wettest with most of the rain; January on the other hand is the driest.