The climate of Portland
Csb Warm-summer Mediterranean. Dry, warm summers and mild, wetter winters. Like the hot-summer Mediterranean climate, but summers are a little cooler, often because of cool ocean currents or altitude.
Portland is north of the equator, so summer falls in June to August and winter in December to February. The 1901 to 1930 map puts Portland in the same zone, Csb.
Portland: then, now and by 2100
| Map | Climate zone | Compared with now |
|---|---|---|
| 1901 to 1930 | Csb Warm-summer Mediterranean | Same as now |
| 1991 to 2020 (now) | Csb Warm-summer Mediterranean | - |
| 2071 to 2099, SSP1-2.6 (low emissions) | Csa Hot-summer Mediterranean | Different from now |
| 2071 to 2099, SSP2-4.5 (middle of the road) | Csa Hot-summer Mediterranean | Different from now |
| 2071 to 2099, SSP5-8.5 (high emissions) | Csa Hot-summer Mediterranean | Different from now |
The 2071 to 2099 rows are model projections under three emissions scenarios, not forecasts. The 1901 to 1930 row is a reconstruction. All come from Beck et al. (2023).
Under the middle-of-the-road scenario (SSP2-4.5), the model puts Portland in Csa (hot-summer mediterranean) in 2071 to 2099, instead of Csb now. Under the high-emissions scenario (SSP5-8.5) it is Csa (hot-summer mediterranean).
Cities with the same climate as Portland
Other big cities that are Csb (warm-summer mediterranean) in 1991 to 2020, at most two per country:
- Cape Town, South Africa
- Quito, Ecuador
- Adelaide, Australia
- San Jose, United States
- San Francisco, United States
Where Portland's future climate exists today
In the SSP2-4.5 map for 2071 to 2099, Portland is Csa. These cities are Csa in 1991 to 2020, so they give a rough idea of the future climate (the real conditions would differ in many ways).
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Population of Portland from GeoNames: 652,503 (rank 897 in our list of 1,000). Climate data: Beck et al. (2023), CC BY 4.0. Data sources and licences.