Research from Fidelity indicates that the S&P 500 has shown positive performance one year after midterm elections 95% of the time since 1938. This trend is consistent regardless of which party wins or whether incumbents or challengers gain more seats. The improvement in stock performance is likely attributed to the decrease in political uncertainty following the elections.

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Historically, stocks have increased 95% of the time during the November-to-November period after midterm elections, marking this timeframe as the best for market returns in the election cycle. Since 1950, the average annual return for stocks in the year following midterms has been 14.5%. The fourth year of the presidential cycle also shows promise, with an average return of 9.1% and a 72% likelihood of an upward market trend, although it is characterized as more unpredictable.

Conversely, the second year of the cycle is often the weakest, with an average return of just 4.9% and a 55% chance of a positive return since 1950. The September leading up to midterms tends to be particularly challenging, with the market declining by 5% or more in 15 of the last 24 midterm election years since 1930. However, October and November typically rebound, with stocks rising an average of 3% and 2.7% in those months during midterm election years, according to the Carson Group. UBS also reported that the market has rallied about 6% from the end of September through the end of the year in these election years.

Investors might want to consider these patterns as they prepare for upcoming market conditions.