paleoclimatic
adjective
pa·leo·cli·mat·ic ˌpā-lē-ō-klī-ˈma-tik 
-klə-
: of, relating to, or being a climate distinctive to a past geologic age
Example Sentences
Recent Examples on the Web That marks the highest amount measured since 1958 -- the start of the instrumental record -- and in at least the last million years, based on paleoclimatic records, the report found. 
Meredith Deliso, ABC News, 31 Aug. 2022 Our colleagues, Earth systems scientists Neil Edwards and Phil Holden, used paleoclimatic data to tweak our model. Pasquale Raia, The Conversation, 8 Oct. 2019
Meredith Deliso, ABC News, 31 Aug. 2022 Our colleagues, Earth systems scientists Neil Edwards and Phil Holden, used paleoclimatic data to tweak our model. Pasquale Raia, The Conversation, 8 Oct. 2019 Word History
Etymology
paleo- + climatic
First Known Use
1893, in the meaning defined above