https://developer.bitcoin.org/reference/rpc/getmininginfo.html

bitcoin-cli getmininginfo

and in there you have


  "networkhashps" : n,         (numeric) The network hashes per second


Not 100% accurate but close enough.

As for a bit of a drop over the past few days, it's been stupid hot all over the US.
And there are lot of miners in Texas. And the state of Texas likes to pay miners not to mine when it's hot out since they can't be bothered to fix their power grid.


https://www.texastribune.org/2024/01/03/texas-bitcoin-profit-electricity/

https://www.tpr.org/technology-entrepreneurship/2023-09-06/texas-paid-a-bitcoin-miner-more-than-30-million-to-power-down-during-heat-wave

And so on.

-Dave