Seasonality
COLB seasonality — Columbia Banking System
Over the last 11 years, COLB's strongest month on average has been November (+5.6%) and its weakest March (-8.1%).
Average return by month
Month-by-month statistics
| Month | Avg | Median | Up % | Best | Worst | Yrs |
|---|---|---|---|---|---|---|
| Jan | -1.51% | +1.93% | 60% | +7.3% | -24.4% | 10 |
| Feb | -1.51% | -3.19% | 40% | +15.0% | -14.2% | 10 |
| Mar | -8.08% | -5.14% | 20% | +6.9% | -27.9% | 10 |
| Apr | -0.45% | +0.21% | 50% | +14.8% | -13.0% | 10 |
| May | -1.50% | -0.36% | 50% | +7.4% | -11.2% | 10 |
| Jun | +2.65% | +2.21% | 60% | +16.4% | -10.7% | 10 |
| Jul | +4.33% | +1.92% | 70% | +31.5% | -9.4% | 10 |
| Aug | -1.70% | -3.64% | 30% | +12.5% | -8.5% | 10 |
| Sep | -0.62% | -2.19% | 40% | +13.3% | -14.6% | 10 |
| Oct | +4.79% | +5.31% | 70% | +19.1% | -10.2% | 10 |
| Nov | +5.62% | +5.95% | 78% | +14.0% | -3.7% | 9 |
| Dec | +0.82% | +0.20% | 50% | +18.9% | -12.9% | 10 |
Monthly returns heat map — COLB
price return, %| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 5.3 | -3.4 | -3.6 | 7.9 | 0.1 | 8.1 | -2.4 | -5.2 | -3.5 | 7.3 | -0.7 | +9.1% | |
| 2025 | 3.3 | -4.2 | -6.7 | -10.1 | 4.3 | 0.0 | 1.8 | 12.5 | -3.9 | 4.1 | 3.4 | 0.8 | +3.5% |
| 2024 | -24.4 | -10.2 | 6.9 | -2.8 | 2.5 | 3.2 | 31.5 | -3.8 | 3.7 | 9.2 | 8.8 | -12.9 | +1.2% |
| 2023 | 2.6 | -3.8 | -27.9 | -0.3 | -6.2 | 1.2 | 10.2 | -8.4 | -0.9 | -3.1 | 14.0 | 18.9 | -11.4% |
| 2022 | 6.3 | 5.3 | -11.9 | -13.0 | 7.4 | -5.0 | 5.3 | -0.7 | -3.5 | 15.8 | 1.8 | -11.5 | -7.9% |
| 2021 | 7.3 | 15.0 | -2.7 | 1.0 | -0.8 | -10.7 | -9.4 | 4.1 | 4.5 | -10.2 | -3.7 | -0.4 | -8.9% |
| 2020 | -4.9 | -14.2 | -19.3 | 0.7 | -9.7 | 16.4 | 2.0 | -3.5 | -14.6 | 19.1 | 11.3 | 13.6 | -11.8% |
| 2019 | 1.3 | 3.1 | -13.7 | 14.8 | -11.2 | 8.5 | 4.2 | -8.5 | 6.9 | 6.5 | -0.6 | 4.1 | +12.1% |
| 2018 | -0.8 | -3.0 | 0.4 | -4.2 | 5.7 | -3.8 | 0.1 | 3.2 | -8.2 | -4.3 | 9.7 | -10.8 | -16.5% |
| 2017 | -11.0 | 0.3 | -2.3 | 1.3 | -7.1 | 8.6 | -0.0 | -6.7 | 13.3 | 3.3 | 6.0 | -5.8 | -2.8% |
| 2016 | 12.2 |