Rainfall/ Precipitation in Decatur, Il, Usa

• Decatur, Il receives 1020.2 mm (40.2 in) of rainfall per year, or 85 mm (3.4 in) per month.
• The driest weather is in January when an average of 50 mm (2 in) of rainfall (precipitation) occurs.
• The wettest weather is in May when an average of 109.5 mm (4.3 in) of rainfall (precipitation) occurs.

Precipitation Table

	Climate Variable	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec		Annual
	Average Precipitation mm (in)	50 (1.97)	50.3 (2)	87.4 (3.4)	96.5 (3.8)	109.5 (4.3)	98.3 (3.9)	109 (4.3)	103.4 (4.1)	86.4 (3.4)	71.6 (2.8)	77.5 (3.1)	80.3 (3.2)		1020.2 (40.2)
	Precipitation Litres/m² (Gallons/ft²)	50 (1.23)	50.3 (1.23)	87.4 (2.14)	96.5 (2.37)	109.5 (2.69)	98.3 (2.41)	109 (2.67)	103.4 (2.54)	86.4 (2.12)	71.6 (1.76)	77.5 (1.9)	80.3 (1.97)		1020.2 (25.02)