Why do airport codes change from green to purple on map?

[Thomas_G]

Green - VFR (Visual Flight Rules) more than 5 Nautical Miles of Visibility, Ceiling is greater that 3,000 Feet AGL.

Blue - MVFR (Marginal Visual Flight Rules) 3-5 Nautical Miles of Visibility, Ceilings are between 1,000 Feet and 3,000 Feet AGL.

Pink - IFR (Instrument Flight Rules) 3-1 Nautical Mile of Visibility, Ceilings are between 500 Feet and 1,000 Feet AGL.

Red - LIFR (Low Instrument Flight Rules) <1 Nautical Mile of Visibility, Ceiling is below 500 Feet.

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DeerCrusher and Mark have some useful tutorials too:

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