For the period 1900-1929 estimate the fraction of days that have a temperature 15o C or greater.

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For the period 1900-1929 estimate the fraction of days that have a temperature 15o C or greater. What is the answer and how do you calculate it? Can you also do this for the 1970-1999 period? (this is for a Geography course on Climate change and is from Andrew Dessler's Introduction to modern climate change second edition textbook). Thank you!