About Griggsville, IL

With a population of around 1,200, Griggsville sits in Illinois, United States. The city operates in the Central Time Zone.

Across a typical year Griggsville sees about 36 inches of precipitation, with May the wettest month and January the driest. Temperatures range from January lows near 19°F up to July highs around 86°F, averaging 53°F annually — characteristic of a humid continental climate.