There are ~11,000 continuously observed weather stations in the United States (which comprises ~6.6% of the world's total land surface area and 1.98% of total surface area). Still almost all have had radical changes in surrounding land uses rendering historical data questionable at best. That's one station per ~350 square miles. But, there are only several hundred with data dating back to the late-19th Century. Call it 300 to use a round number. That's one station per ~13,000 square miles. The vast majority of the world's weather stations are either in the US or Western Europe and virtually none in Africa, Asia or South America with any historical data.
What's the point of this discussion?
The heat capacity of the world's oceans (5.6E24 Joules / Degree Kelvin) exceeds that of the world's atmosphere (5E21 J / K) by a factor of 1,120. Only ~30% of the world's surface area is Land. How many continuously observed weather stations monitor the world's oceans, comprising ~70% of the Earth's surface area, including temperature and current profiles in the vertical water column? ZERO! Yes, there are some buoys that have been developed and deployed in recent decades that measure a tiny fraction of the Ocean’s volume. But, they are few and far between.
Any computer program purporting to analyze climatic trends using only Land-based air temperature and precipitation data sets, which are of questionable accuracy, covering a tiny fraction of the world's surface, are stellar examples of the classic "GIGO—garbage in, garbage out" observation about using computers for any kind of analysis.
https://www.theepochtimes.com/article/trillions-spent-on-climate-change-rely-on-inaccurate-temperature-readings-and-faulty-modeling-5575177