Seasonality
COST seasonality — Costco
Over the last 11 years, COST's strongest month on average has been November (+6.9%) and its weakest December (-2.0%).
Average return by month
Month-by-month statistics
| Month | Avg | Median | Up % | Best | Worst | Yrs |
|---|---|---|---|---|---|---|
| Jan | +3.21% | +4.99% | 80% | +12.0% | -11.0% | 10 |
| Feb | +1.30% | +2.36% | 60% | +8.1% | -8.0% | 10 |
| Mar | +1.27% | +0.06% | 50% | +10.9% | -9.8% | 10 |
| Apr | +2.30% | +3.22% | 80% | +6.3% | -7.7% | 10 |
| May | +0.35% | +1.65% | 70% | +12.0% | -12.3% | 10 |
| Jun | +1.32% | +3.70% | 60% | +10.3% | -11.4% | 10 |
| Jul | +3.45% | +4.22% | 70% | +12.9% | -5.1% | 10 |
| Aug | +2.77% | +3.19% | 60% | +8.6% | -3.5% | 10 |
| Sep | -0.87% | -1.00% | 40% | +4.8% | -9.5% | 10 |
| Oct | +2.09% | -0.33% | 50% | +11.2% | -2.7% | 10 |
| Nov | +6.90% | +7.53% | 100% | +14.5% | +0.2% | 9 |
| Dec | -2.02% | -2.90% | 40% | +11.4% | -15.3% | 10 |
Monthly returns heat map — COST
price return, %| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 9.0 | 7.5 | -1.4 | 1.8 | -5.7 | -2.2 | 1.8 | -0.8 | -3.5 | 11.2 | 4.1 | +22.2% | |
| 2025 | 6.9 | 7.0 | -9.8 | 5.2 | 4.6 | -4.8 | -5.1 | 0.4 | -1.9 | -1.5 | 0.2 | -5.6 | -5.9% |
| 2024 | 5.3 | 7.0 | -1.5 | -1.3 | 12.0 | 5.0 | -3.3 | 8.6 | -0.7 | -1.4 | 11.2 | -5.7 | +38.8% |
| 2023 | 12.0 | -5.3 | 2.6 | 1.3 | 1.7 | 5.2 | 4.1 | -2.0 | 2.9 | -2.2 | 7.3 | 11.4 | +44.6% |
| 2022 | -11.0 | 2.8 | 10.9 | -7.7 | -12.3 | 2.8 | 12.9 | -3.5 | -9.5 | 6.2 | 7.5 | -15.3 | -19.6% |
| 2021 | -6.5 | -6.1 | 6.5 | 5.6 | 1.7 | 4.6 | 8.6 | 6.0 | -1.4 | 9.4 | 9.7 | 5.2 | +50.7% |
| 2020 | 4.0 | -8.0 | 1.4 | 6.3 | 1.8 | -1.7 | 7.4 | 6.8 | 2.1 | 0.7 | 9.6 | -3.8 | +28.2% |
| 2019 | 5.4 | 1.9 | 10.7 | 1.4 | -2.4 | 10.3 | 4.3 | 6.9 | -2.3 | 3.1 | 0.9 | -2.0 | +44.3% |
| 2018 | 4.7 | -2.0 | -1.3 | 4.6 | 0.6 | 5.4 | 4.7 | 6.6 | 0.8 | -2.7 | 1.2 | -11.9 | +9.4% |
| 2017 | 2.4 | 8.1 | -5.4 | 5.9 | 1.6 | -11.4 | -0.9 | -1.1 | 4.8 | -1.9 | 14.5 | 0.9 | +16.2% |
| 2016 | 6.7 |