How can scientists accurately know the global temperature 120,000 years ago?

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Scientist claims that July 2023 is the hottest July in 120,000 years.
My question is: how can scientists accurately and reproducibly state this is [the hottest month of July globally in 120,000 years](https://www.theage.com.au/environment/climate-change/the-hottest-july-in-120-000-years-what-s-in-store-for-australia-this-summer-20230719-p5dpm3.html)?

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Anonymous 0 Comments

We don’t really know, we can make educated guesses with statistics, we are using gasses in ice cores which are more accurate but there could still be factors we couldn’t know about. We are also relying on tree growth rings. We are taking data from various sources and trying to make a statistical model which sometimes involved filling in data sets with random numbers to help with the stats. As science gets more into politics things also start getting funny. Studies won’t release their full data sets because they don’t want people to manipulate the stats to come up with different results. All the hottest this or that on record is sensationalism and more politics than science. The real message is that we can tell with some degree of confidence that the climate is getting warmer the further back you try to take that and the more accuracy you try to place the less confident you become.

https://www.google.com/amp/s/www.forbes.com/sites/larrybell/2014/02/04/global-warmings-tree-ring-circus/amp/

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