Analysis of the environment suggested that most storms formed during the passage of the positive Madden–Julian oscillation and its associated upper-air divergence, which is favorable for tropical cyclone formation. Extended reprieves in tropical activity were connected to upper-level convergence. Another factor that led to a below-average season was the presence of cooler than average ocean temperatures during the peak months, helping to extend the period of lesser activity that began throughout the eastern Pacific around 1995. The 2005 became a record-tying most active in the month between 1966, 1992, 1994, 1997, later in 2019 forming six named storms in the basin