The takeaway
Constellation Energy Corp shows a pronounced seasonal pattern over 4 years of data — strongest in May (+15.4%) and softest in December (−5.8%).
Right now
In July, the stock has risen 75% of years, averaging +6.4%, about +4.3 pts better than the S&P 500.
The full picture
Constellation Energy Corp's most dependable month has been May, higher in 4 of 4 years; December has been its least reliable, up just 0% of the time.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Win rate % | ||||||||||||
| Median return % | ||||||||||||
| 2025 | ||||||||||||
| 2024 | ||||||||||||
| 2023 | ||||||||||||
| 2022 |
Month by month
The stock's clearest edge over the S&P 500 lands in May (+14.7 pts); it has trailed the market most in December (−6.8 pts).
“vs S&P” is Constellation Energy Corp’s average for a month minus the S&P 500’s average for that same month — isolating Constellation Energy Corp’s own seasonal edge from broad market drift.
Reality check
Over the last 4 years, May has closed higher 100% of the time versus 100% across the last 4 years — the pattern is holding.
Figures are the typical (median) May return and how often it rose — the last 4 years versus the last 4(the heatmap’s default window). This verdict stays anchored to that 4-year window even if you zoom the chart, so it never disagrees with the badges above.
In plain English
Dependability is the through-line here. May stands out, higher in all 4 Mays, but it heads a clutch of months that pull the year reliably upward.
Its average (+15.4%) and median (+13.7%) land within a hair of each other — the tell of steady, year-after-year gains rather than one outlier doing the work. That reliability comes with real swings, mind — even May ranges by 8.0% from year to year, so any single year can land far from the average. Crucially, the gain is the stock's own rather than a rising tide's: May has cleared the S&P 500 by +14.7 points above the index. That consistency sets it apart from the field, where the average stock manages May only about 55% of the time.
The strength clusters rather than stands alone — March–May forms a firm stretch that carries much of the year. At the other end of the calendar, December has been the soft spot — the weakest of 3 months that average a loss (−5.8%), and the edge isn't year-round — the stock has trailed the S&P 500 in December, June, and November. Its roughest month on record was a −18.2% February in 2025 — a reminder of how hard even a seasonal name can fall.
The takeaway is less about when to buy than what to expect: May aside, the stock's months offer little reliable tilt. With a short 4-year record, the signal is best held loosely.
Short answers on the stock's best month (May), its worst (December), and whether it really trades seasonally.
Yes, to a pronounced degree. Since 2022 its best month (May, +15.4%) has run well ahead of its worst (December, −5.8%) — the heatmap above shows how steady that gap has been year to year.
May has been the strongest, averaging +15.4% and closing higher in all 4 years on record since 2022.
It's the weakest, averaging −5.8% — 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