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The Sunny 16 Rule provides a great starting point for outdoor photography on a sunny day, and cloudy days too. The rule is simple; set your f-stop to 16, and your ISO should be a reciprocal of the shutter speed. Thus, if the ISO is set to 100, the shutter speed should be set to 1/100 (or something close to 1/100, 1/125).

Here is a cheat sheet:

	Sunny Distinct Shadows	Hazy Sun Soft Shadows	Cloudy Barely Visible Shadows	Overcast No Shadows
F-Stop	f / 16	f / 11	f / 8	f / 5.6
ISO 100	1/125	1/125	1/125	1/125
ISO 200	1/250	1/250	1/250	1/250
ISO 400	1/500	1/500	1/500	1/500
ISO 800	1/1000	1/1000	1/1000	1/1000