The takeaway
Dimensional US Sustainability Core 1 ETF shows a moderate seasonal pattern over 4 years of data — strongest in November (+5.5%) and softest in April (−2.0%).
Right now
In July, the fund has risen 100% of years, averaging +2.8%, about +0.7 pts better than the S&P 500.
The full picture
Dimensional US Sustainability Core 1 ETF's most dependable month has been November, higher in 4 of 4 years; April has been its least reliable, up just 33% 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 fund's clearest edge over the S&P 500 lands in January (+4.8 pts); it has trailed the market most in April (−3.6 pts).
“vs S&P” is Dimensional US Sustainability Core 1 ETF’s average for a month minus the S&P 500’s average for that same month — isolating Dimensional US Sustainability Core 1 ETF’s own seasonal edge from broad market drift.
Reality check
Over the last 4 years, November has closed higher 100% of the time versus 100% across the last 4 years — the pattern is holding.
Figures are the typical (median) November 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
This is a fund you can almost set a calendar by, and November is the anchor — it has closed higher in all 4 Novembers, the steadiest beat on its year.
The strength looks broad-based rather than freakish: its average (+5.5%) and median (+6.7%) sit close together, so no single blow-out year is flattering the figure. Better still, that strength is the fund's own and not just a buoyant market — November has outpaced the S&P 500 by +3.2 points on average. Few peers keep such company in November — the typical stock clears it just 62% of the time.
November anchors a run, too: the May-through-November window has been the fund's reliable season. At the other end of the calendar, April has been the soft spot — the weakest of 3 months that average a loss (−2.0%), and the edge isn't year-round — the fund has trailed the S&P 500 in April, December, and October.
For a fund this dependable in November, the sharper question is the rest of the year — outside its strong stretch, the calendar gives far less to lean on. With a short 4-year record, the signal is best held loosely.
Short answers on the fund's best month (November), its worst (April), and whether it really trades seasonally.
Yes, to a moderate degree. Since 2022 its best month (November, +5.5%) has run well ahead of its worst (April, −2.0%) — the heatmap above shows how steady that gap has been year to year.
November has been the strongest, averaging +5.5% and closing higher in all 4 years on record since 2022.
It's the weakest, averaging −2.0% — 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