Note: I usually ignore the global average temperature data before 1979.
The global surface coverage was too sparse for accuracy in that time period. (see the last three charts)
And the far better global coverage of the weather satellites did not begin until 1979.
The temperature of our planet is always increasing or decreasing.
It is significantly warmer than 20,000 years ago when Canada was entirely covered by ice.
Also warmer today than in the late 1600's, based on climate proxy temperature reconstructions, and a few central England weather stations, probably warming by at least +2 degrees C. from the 1690s.
The planet is warmer since the mid-1970s with both surface and satellite measurements.
But there has been some global cooling since the Holocene Optimum period about 8,000 years ago.
And our planet today is unusually cool when compared with all 4.5 billion years of Earth's climate history,
Everyone alive today has lived with actual global warming, for up to the past 45 years, and rising CO2 levels for their entire life.
Official temperature data before World War II gets less accurate as we go back in time.
Data before 1900 are almost entirely Northern Hemisphere only.
More likely to be correct data are UAH numbers, available since 1979, using satellites (see UAH chart), which have far better global coverage than surface measurements.
These are the "official surface numbers" and their accuracy is never discussed.
The Hadley numbers from Great Britain, called HadCRUT, are used by the The Intergovernmental Panel on Climate Change (IPCC).
Honest global average temperature charts reflect how tiny temperature changes feel to people -- that's why tiny temperature changes are hard to see on the charts.
These are are not hugely magnified charts of tiny temperature changes that no one would even notice, frequently used to scare people.
The UAH chart is one of those highly magnified charts, shown here for a comparison.
The first chart is the NASA-GISS surface average temperature (F. degrees) from 1880 to 2016, from the home page of this blog.
It's invisible on smart phones, unless you use the "web view".
Think of the first chart below as 136 ordinary red-line mercury thermometers in a row, with each one showing the global average temperature for one year:
The next three charts are Hadley (HadCRUT) British surface average temperature charts presented with a similar, honest perspective, using K. (Kelvin) degrees or C. degrees:
The next chart is the UAH global average temperature, using data collected by satellites, measured in the consistent environment of the troposphere, where the greenhouse gas warning effect occurs.
Very little UAH infilling (guessing) is required -- only for small areas over both poles, that satellites can't measure.
Land surface temperatures, however, include a lot of infilling (guessing), for the many remote ares with no thermometers.
The infilling is done by government bureaucrat scientists who WANT to show rapid global warming, because they have been predicting that for over 60 years.
Their infilling guesses can never be verified.
There are areas in central Africa that NASA-GISS claims are setting heat records, in spite of the fact that there are no weather stations located there. NASA wild guesses are claimed to be warmer than the prior NASA wild guesses!
Surface measurements show more warming than UAH measurements, so climate alarmists automatically reject UAH satellite data:
The next three charts show locations of land weather stations used for the land surface temperature charts,
The last (animated) chart is a comparison of 1880 versus 2020. Showing that 2020 still has some sparse coverage:
