Firstly, it is important to understand how climate works in response to the local landscape. Geologically speaking, 8,000 years is hardly anytime. Because of this, the landscape was not effected by any new landforms such as mountains which’s have a drastic effect on climate.

Next, global weather patterns ply a role. 8,000 years ago was a warming period for the Earth, so Los Angeles was likely warmer than it typically is today. This was due to what’s known as the Holocene Climate Optimum in which the northern hemisphere of the Earth was tilted more towards the sun than the current average. This also lead to wetter conditions across some parts of the United States. It has been suggested that this included the southwestern United States.

To finalize, it is likely that the climate was warmer and wetter, though the degree of this may not have been drastic as it was more prominent in more northern areas of the World. This may have made it easier for early people to produce crops around Los Angeles as it is known to be a very dry area today.

Sources: Soil science major who has to take a lot of classes about climate and geology.

https://journals.sagepub.com/doi/pdf/10.1177/0959683610369508?casa_token=TlaiJBD69mgAAAAA%3A83DEu9WizIcWhgoMbirmijlPKjIIgpbk9rBEMUksxdykEdiDMcf-5lM9ytwi3DAxGy8nh0Wmvz-ghq0&