Climatic trend data from simple sources



Bob Ryan's Almanac, published annually by Ryan in cooperation with WRC-TV and Giant Food Stores in the Washington, D.C. area, contains record maximum and minimum temperatures for each day of the year, and the year of each record. For example, if you look at January 1, in the 1998 Almanac, it lists the record high of 68 degrees Fahrenheit in 1966 and the record low of −14 in 1881. I realized that if one tabulated these year dates in a spreadsheet and sorted them in year order, separately for the high and the lows, one might see a trend. Some years might have many record maximum temperatures and some might have many record minimums. If fact, many years had none.