Last updated by The POOG on October 22, 2020.

Global temperature is a surprisingly difficult concept to quantify by measurement. tradtional methods usinf thermometers have only been in use since the seventeenth century[1].

Satellite Data

The original means of measuring temperature was the mercury thermometer. In 1979, the National Oceanic and Atmospheric Administration (NOAA) launched the first of a series of satellites to measure atmospheric temperature. Satellite data is a more accurate measure of global temperature because the satellites cover most of the globe. Thermometers are not arranged to give good geographic coverage and can’t give consistent ocean coverage.

Dr. Roy Spencer and his colleagues produce a monthly temperature figure, available at At the time of this writing in October, 2020, the most recent data is:

The graph shows the important distinction between weather data (blue) and climate data (red). Climate is the longer-term average of weather data, in this case a 13-year simple moving average.

Fudging the Data

Tony Heller explains how NOAA falsifies temperature records to warm them up.

An important observation which has been made by others in the past is that large areas of the globe have no thermometers for official data recording, while other vast areas have at most a handful. To get a “global” record one must make gross assumptions and manipulate the data extensively. Heller in the video, references the decline in the number of US thermometers and this is true globally. So why not use satellite measurements that do give a global data set?

So let’s go to the source of the land temperature data, NOAA:

Heller also has a three-part video series showing how NOAA fudges US Temperature data:


  1. Mary Bellis. The History of the Thermometer. ThoughtCo., May 07, 2019.