The takeaway
Generac Holdings Inc shows a pronounced seasonal pattern over 10 years of data — strongest in July (+11.9%) and softest in March (−2.5%).
Right now
In July, the stock has risen 90% of years, averaging +11.9%, about +9.7 pts better than the S&P 500.
The full picture
Generac Holdings Inc's most dependable month has been July, higher in 9 of 10 years; March has been its least reliable, up just 30% of the time.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Win rate % | ||||||||||||
| Median return % | ||||||||||||
| 2025 | ||||||||||||
| 2024 | ||||||||||||
| 2023 | ||||||||||||
| 2022 | ||||||||||||
| 2021 | ||||||||||||
| 2020 | ||||||||||||
| 2019 | ||||||||||||
| 2018 | ||||||||||||
| 2017 | ||||||||||||
| 2016 |
Month by month
The stock's clearest edge over the S&P 500 lands in July (+9.7 pts); it has trailed the market most in December (−4.6 pts).
“vs S&P” is Generac Holdings Inc’s average for a month minus the S&P 500’s average for that same month — isolating Generac Holdings Inc’s own seasonal edge from broad market drift.
Reality check
Over the last 5 years, July has closed higher 100% of the time versus 90% across the last 10 years — the pattern is strengthening.
Figures are the typical (median) July 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
The seasonal story is really one month's story — July. It has closed higher in 9 of 10 Julys, a concentration the rest of the calendar can't touch.
Read it with one caveat: the average (+11.9%) runs well ahead of the median (+5.5%), so a handful of outsized years — not steady strength — do much of the lifting. That reliability comes with real swings, mind — even July ranges by 12.2% from year to year, so any single year can land far from the average. Better still, that strength is the stock's own and not just a buoyant market — July has outpaced the S&P 500 by +9.7 points on average. Few peers keep such company in July — the typical stock clears it just 61% of the time.
July anchors a run, too: the April-through-August window has been the stock's reliable season. At the other end of the calendar, March has been the soft spot — the weakest of 4 months that average a loss (−2.5%), and the edge isn't year-round — the stock has trailed the S&P 500 in December, March, and April. Its roughest month on record was a −34.7% October in 2022 — a reminder of how hard even a seasonal name can fall.
July has now closed higher 8 years running. If anything it has sharpened recently — the last five Julys run ahead of the earlier years.
For a stock this dependable in July, the sharper question is the rest of the year — outside its strong stretch, the calendar gives far less to lean on.
Short answers on the stock's best month (July), its worst (March), and whether it really trades seasonally.
Yes, to a pronounced degree. Since 2016 its best month (July, +11.9%) has run well ahead of its worst (March, −2.5%) — the heatmap above shows how steady that gap has been year to year.
July has been the strongest, averaging +11.9% and closing higher in 9 of 10 years since 2016.
It's the weakest, averaging −2.5% — 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