If you're looking for summer vibes, the best time to travel to Oshkosh is in June, July and August, when the average temperature reaches 21.81 °C, while May, September and March are the 3 sunniest months of the year, with an average of 117.83 hours.
However, if you prefer colder temperatures, make sure you visit Oshkosh during January, February or December to experience an average of -6.22 °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 Oshkosh is 5.25 mm, while the months of January, February and March are drier, with an average of 0 mm.