The takeaway
SPDR Portfolio TIPS shows a slight seasonal lean over 10 years of data — strongest in July (+1.1%) and softest in September (−0.8%).
Right now
In July, the fund has risen 80% of years, averaging +1.1%, roughly 1.0 pts behind the S&P 500.
The full picture
SPDR Portfolio TIPS's most dependable month has been July, higher in 8 of 10 years; September has been its least reliable, up just 30% of the time.
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Month by month
The fund's clearest edge over the S&P 500 lands in January (+0.8 pts); it has trailed the market most in November (−1.8 pts).
“vs S&P” is SPDR Portfolio TIPS’s average for a month minus the S&P 500’s average for that same month — isolating SPDR Portfolio TIPS’s own seasonal edge from broad market drift.
Reality check
Over the last 5 years, July has closed higher 100% of the time versus 80% 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
This is a fund you can almost set a calendar by, and July is the anchor — it has closed higher in 8 of 10 Julys, the steadiest beat on its year.
The strength looks broad-based rather than freakish: its average (+1.1%) and median (+0.6%) sit close together, so no single blow-out year is flattering the figure. Few peers keep such company in July — the typical stock clears it just 61% of the time.
The lift is near-universal — strength runs through almost every month of the year, not one window. On the other side of the ledger, September has been the soft spot — the only month to average an outright loss (−0.8%), and the edge isn't year-round — the fund has trailed the S&P 500 in November, April, and October.
July has now closed higher 7 years running. If anything it has sharpened recently — the last five Julys run ahead of the earlier years.
For a fund 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 fund's best month (July), its worst (September), and whether it really trades seasonally.
Only mildly. The fund's months are fairly even — July is the firmest (+1.1%) and September the softest (−0.8%), a narrow spread that points to weak seasonality rather than a strong calendar effect.
July has been the strongest, averaging +1.1% and closing higher in 8 of 10 years since 2016.
It's the weakest, averaging −0.8% — 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.
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