The exact number of inches of rain that fell on "that day" is not specified in the search results provided. Rainfall is typically measured in inches or millimeters using a rain gauge, which collects precipitation over a set period, usually 24 hours

. To determine how many inches of rain fell on a specific day, you would need the rainfall measurement recorded by a rain gauge for that day. If you have access to specific rainfall data for the day in question, it would be reported as the depth of water collected, expressed in inches. For example, rainfall amounts might be reported as something like 0.5 inches or 1.2 inches for a day, depending on the precipitation volume

. Without a specific date or location's rainfall data from the search results, the precise rainfall amount in inches cannot be provided here. If you can provide the date or location, I can help look for more detailed rainfall data.