Clean Harbors (CLH) Seasonality
Recurring seasonal patterns for CLH — the calendar windows where Clean Harbors has historically tended to rise or fall, with the win rate (how often it repeated) and average return for each, based on the last 10 years of price history.
CLH seasonality at a glance
Over the last 10 years, CLH's strongest seasonal window has been May 29 – Jun 8: it ended higher in 10 of 10 years (100% win rate) with an average return of +4.34% across a 10-day hold. On the weak side, CLH has historically declined between Oct 14 – Nov 3, falling in 9 of 10 years (average -3.84%).
In total, our analysis finds 735 recurring seasonal windows for Clean Harbors — 570 bullish and 165 bearish. The next high-win-rate window, Jul 28 – Aug 7, opens tomorrow. These figures describe historical behaviour only — not a forecast.
CLH's upcoming & recent seasonal patterns
Holding period:10-day20-day30-dayOrdered by season — windows opening soon first, plus a couple of recently completed high-performers. Holding-period colors help you compare durations at a glance.
| Status | Seasonal window | Hold | Avg return | Win rate | This year |
|---|---|---|---|---|---|
| Completedended 3d ago | Jul 14 – Jul 24 | 10d | +1.62% | 80% | +0.43% |
| Completedended 3d ago | Jul 4 – Jul 24 | 20d | +1.10% | 90% | +5.24% |
| Active10d left | Jul 27 – Aug 6 | 10d | +4.14% | 80% | — |
| Active20d left | Jul 27 – Aug 16 | 20d | +5.43% | 80% | — |
| Upcomingtomorrow | Jul 28 – Aug 7 | 10d | +4.44% | 80% | — |
| Upcomingtomorrow | Jul 28 – Aug 17 | 20d | +4.68% | 80% | — |
| Upcomingin 2d | Jul 29 – Aug 18 | 20d | +4.35% | 80% | — |
Win rate = how often the pattern repeated in the same direction. Average return = the mean move across all analysed years. Past performance does not guarantee future results.
Explore CLH seasonality in full
See the seasonal curve chart, filter by win rate and return, and track upcoming windows — free during beta.
CLH seasonality FAQ
What has historically been the best month to buy CLH stock?
Based on the last 10 years of price data, CLH's strongest seasonal window starts in May: May 29 to Jun 8, which ended higher in 10 of 10 years (100% win rate) with an average return of +4.34%. Past seasonal patterns do not guarantee future performance.
What is CLH's strongest seasonal pattern?
CLH's highest-win-rate pattern in our data is the May 29 – Jun 8 window (10-day hold): up in 10 of the last 10 years with an average move of +4.34%.
When has CLH historically performed worst?
CLH's weakest recurring window has been Oct 14 to Nov 3, declining in 9 of 10 years with an average return of -3.84%.
How reliable are CLH's seasonal patterns?
Each CLH pattern is scored by its historical win rate — the share of the last 10 years it repeated in the same direction. CLH currently shows 735 recurring windows (570 bullish, 165 bearish). Seasonality describes historical tendencies only; it is not a prediction, and past performance does not guarantee future results.
What is CLH stock seasonality?
Stock seasonality is the tendency of a stock to perform in a similar way during the same period each year. By analysing Clean Harbors's price history across many years, SeasonalityX identifies recurring calendar windows — exact start and end dates — where CLH has repeatedly risen (bullish) or fallen (bearish). Each pattern is scored by its win rate and average return so you can judge how reliable and how strong it has been.
Seasonality is one input among many — it works best alongside your own research and risk management. Learn more in our guide to seasonal analysis and the tutorials.