LOCATION.-- Latitude 41°46'55", Longitude 88°10'23" (NAD of 1927), in NE1/4NW1/4NE1/4 sec.14, T.38 N., R.9 E., Du Page County, Hydrologic Unit 07120004, on State Highway 34 2.0 mi east of State Highway 59, and located at the Naperville North Operations Center at Naperville.

PERIOD OF RECORD.--

PRECIPITATION: July 1997 to current year.

GAGE.-- A 6-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, 2.74 in.(estimated), October 13, 2001.