LOCATION.-- Latitude 41°54'57", longitude 88°15'06" (NAD of 1927), in NW1/4SW1/4SE1/4 sec. 30, T.40N., R.9 E., Du Page County, Hydrologic Unit 07120004, on Tower Road 0.4 mi south of Keil Street, and located near the southeast corner of the first aeroplane hanger of the Du Page County Airport near St. Charles.

PERIOD OF RECORD.--

PRECIPITATION: February 1986 to current year.

GAGE.-- An 12-in.-diameter, unheated, tipping-bucket rain gage.

REMARKS.-- Snowfall-affected data can result during cold weather when snow fills the rain-gage funnel and then melts as temperatures rise. Snowfall-affected data are subject to appreciable errors.

EXTREMES FOR PERIOD OF RECORD.--

PRECIPITATION: Maximum daily total, 4.26 in., August 14, 1987.