If you're looking for summer vibes, the best time to travel to Dubuque, IA is in June, July and September, when the average temperature reaches 23.13 °C, while July, September and June are the 3 sunniest months of the year, with an average of 154.82 hours.
However, if you prefer colder temperatures, make sure you visit Dubuque, IA during January, February or December to experience an average of -5.32 °C.
For those who don't care too much about temperatures, but want to avoid getting wet in the rain, it's important to avoid travelling during January, February and March, when the average precipitation in Dubuque, IA is 6 mm, while the months of January, February and March are drier, with an average of 0 mm.