Analysts say this key metric suggests an altcoin season is at hand

Bitcoin’s (BTC) 65% recovery from sub $29,500 on July 20 to a swing high at $48,200 on Aug. 14 took less than a month and helped bring fresh bullish momentum back to the crypto market and traders who were dreading the prospect of another prolon bear market.
Currently, the BTC rally has stalled out near the $46,000 price level and this phase of sideways trading is giving altcoins an opportunity to step forward. As shown in the chart below, the total market capitalization of the altcoin market has risen 80% since July 20. Meanwhile, the Bitcoin dominance rate is down 10% since July 30.

Data from TradingView shows that the dominance rate of Bitcoin altcoins had been on the rise in recent weeks but this trend fizzled out for Bitcoin on July 30 as a number of altcoin projects rallied due to a market-wide oversold bounce, new partnerships and protocol updates.
DeFi and NFT projects hit record highs
Projects with a focus on NFTs and decentralized finance (DeFi) were the leading altcoin gainers over the past four weeks. 
Three of the biggest gainers over the past month include Axie Infinity (AXS), Solana (SOL) and Terra (LUNA), which all saw their prices breakout to new record highs on Aug. 17
As shown above, AXS price surged nearly 400%, while LUNA and SOL increased by 340% and 187% respectively.
One interesting observation to note is that Solana and Terra began to see increased interest several days after the implementation of the London hard fork on the Ethereum network.
While the London hard fork introduced several beneficial changes to the Ethereum network, including a token burning mechanism that has the potential to make Ether deflationary, the upgrade did little to solve the problem of high transaction costs. This left the door open for competing layer-one solutions like Solana and Terra to gain market share.
Related: Eth2 staking contract ranks as single-largest Ether hodler with $21.5B
Analysts announce the start of altcoin season
The surge in altcoins has led many traders to forecast the dawn of a new altcoin season. According to The Moon, a pseudonymous Twitter analyst, altcoin seasons follow a major run-up in the price of BTC, especially when the price stalls or pullsback. 

The altcoin season is happening right now exactly as I predicted!!! pic.twitter.com/Od0wef67ga

— The Moon (@TheMoonCarl) August 11, 2021

Further evidence that points toward the start of an altseason are found in the increasing number of altcoins notching new all-time highs over the past two weeks. Double-digit daily gains and price breakouts from projects like Audius and meme coins like Dogecoin (DOGE) and Shiba Inu (SHIB) are making headlines and crypto Twitter is abuzz with chitter-chatter about the hottest altcoins to watch.
Despite these strong performances, it’s interesting to note that the Altcoin Season Index is actually at its lowest point in 2 years, as highlighted in the tweet below.

The last 30 days were Altcoin friendly, but the Altcoin Season Index (90 days) is the lowest in 2 years.
What comes next?https://t.co/EbbDVymYJ5 pic.twitter.com/MjaTjU6zXM

— Holger (@rohmeo_de) August 16, 2021

What this means, in the long run, is up for interpretation, but one bullish take is that the altcoin rally seen in the past 2 weeks is just a prelude to the real altcoin season which has yet to begin.
To date, Bitcoin continues to be the leading market indicator that dictates the future direction of the crypto market as a whole, but data shows that consolidation phases often give altcoins an opportunity to push higher.
If Bitcoin price drops back toward $40,000 or below, then most analysts would expect altcoin prices to also move south. On the other hand, a rally above the $48,000 level is likely to see altcoin prices push higher. 
The views and opinions expressed here are solely those of the author and do not necessarily reflect the views of Cointelegraph.com. Every investment and trading move involves risk, you should conduct your own research when making a decision.