At 4.45pm on Sunday, a circumzenithal arc - which looks like a bright, upsidedown rainbow - was visible above the city.
Cambridge-based astronomer Jacqueline Mitton captured the stunning sight, caused by sunlight being refracted through ice crystals high in the atmosphere, with her camera. The phenomenon is rarely seen outside the polar regions.
She said: "The conditions have to be just right: you need the right sort of ice crystals and the sky has to be clear. It's quite surprising for this to occur somewhere like Cambridge, usually it is in places that are colder."
The intensity of the colours in the rainbow was heightened by the sun being at the optimum spot in the sky - 22 degrees.
A Met Office spokeswoman said: "They are fairly rare. It is convex to the sun and is formed by refraction in suitably-oriented ice crystals and may show vivid rainbow colouring, as in this case."
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