In terms of precipitation, rainfall in Decatur, Illinois ranges from 43.0 - 112.0 mm per month. June is typically the wettest month, when rainfall can reach 112.0 mm. January is typically the driest time to visit Decatur, Illinois when rainfall is around 43.0 mm.
If weather is an important factor for your trip to Decatur, Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 24.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -3.0 C).
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