We have been quite lucky with the weather recently, it has got steadily warmer each day, over the last five days. By this, I mean that the temperature rose by the same amount each day. The average temperate was 2 degrees C and I know it froze on two occasions. I also know the product of the temperatures was over 500 degrees. What were the last 5 temperatures?

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The temperatures were -6, -2, 2, 6, 10 degrees C. Each day increased by a steady 4 degrees. There are other answers which are close, but this is the only one which satisfies all parts of the question.

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