Global average temperature is not a well-defined statistical measure and can be surprisingly difficult to measure given large regional random and systemic varia

Global average temperature is not a well-defined statistical measure and can be surprisingly difficult to measure given large regional random and systemic variation in the measurement, including sampling effects. But, if you live near some mountains, you can look at them and compare to pictures taken 50 years ago and draw some conclusions about precipitation and temperature trends at the top of your local mountain range over the last 50 years. When I don't know what and who to believe anymore, that's what I usually do. Also, nothing is preventing anyone from getting a thermometer and measuring + charting daily local temperatures themselves. Does anyone want to write an app with me, where you can record and chart your daily ground level local temperature where you live, and discuss it with others?