I would like to ask you what is the best (or the right way) to calculate the rate of change in air temperature over a period of time and then see how this rate changes over time. Daily air temperature data do not follow a line, but it goes up and down.
So, to estimate the seasonal rate of change in temperature: Can I use simple linear regression and take the slope as the value of change or should I calculate the average rate of change between my first and last date for each season? or between the first day and the highest point? or what is the right way to estimate it?
Thank you for your comments, advices and answers!