The takeaway
Charter Communications Inc shows a moderate seasonal pattern over 10 years of data — strongest in August (+3.0%) and softest in October (−2.2%).
Right now
In July, the stock has risen 70% of years, averaging +2.8%, about +0.6 pts better than the S&P 500.
The full picture
Charter Communications Inc's most dependable month has been August, higher in 8 of 10 years; October has been its least reliable, up just 20% of the time.
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Month by month
The stock's clearest edge over the S&P 500 lands in January (+3.2 pts); it has trailed the market most in September (−3.7 pts).
“vs S&P” is Charter Communications Inc’s average for a month minus the S&P 500’s average for that same month — isolating Charter Communications Inc’s own seasonal edge from broad market drift.
Reality check
Over the last 5 years, August has closed higher 60% of the time versus 80% across the last 10 years — the pattern is weakening.
Figures are the typical (median) August return and how often it rose — the last 5 years versus the last 10(the heatmap’s default window). This verdict stays anchored to that 10-year window even if you zoom the chart, so it never disagrees with the badges above.
In plain English
Strip the year back and a single month does the heavy lifting: August, up in 8 of 10 Augusts while the other eleven tend to blur together.
Its average (+3.0%) and median (+3.7%) land within a hair of each other — the tell of steady, year-after-year gains rather than one outlier doing the work. It is also the calendar's calmest month, its returns swinging least from year to year (a 5.1% spread). Crucially, the gain is the stock's own rather than a rising tide's: August has cleared the S&P 500 by +2.7 points above the index. That consistency sets it apart from the field, where the average stock manages August only about 52% of the time.
The strength clusters rather than stands alone — April–September forms a firm stretch that carries much of the year. At the other end of the calendar, October has been the soft spot — the weakest of 5 months that average a loss (−2.2%), and the edge isn't year-round — the stock has trailed the S&P 500 in September, December, and October. Its roughest month on record was a −35.6% July in 2025 — a reminder of how hard even a seasonal name can fall.
The pattern has softened of late, August's last five years slipping below its longer-run record.
The takeaway is less about when to buy than what to expect: August aside, the stock's months offer little reliable tilt.
Short answers on the stock's best month (August), its worst (October), and whether it really trades seasonally.
Yes, to a moderate degree. Since 2016 its best month (August, +3.0%) has run well ahead of its worst (October, −2.2%) — the heatmap above shows how steady that gap has been year to year.
August has been the strongest, averaging +3.0% and closing higher in 8 of 10 years since 2016.
It's the weakest, averaging −2.2% — historically a soft spot, though it still varies from year to year.
Explore
These names have the strongest July track records on record — a starting point for comparison.
Before you trade