The average transaction fee for Bitcoin peaked at $3.19 on May 8, an increase of over 300% from the average fee of $0.62 on April 26.
Source: https://cointelegraph.com/news/average-btc-transaction-fees-increased-300-days-before-halving
Average BTC Transaction Fees Increased 300% Days Before Halving
May 11, 2020
CoinTelegraph