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> Usa > Portland, Oregon > Precipitation
Rainfall/ Precipitation in Portland, Oregon, Usa
- Portland, Oregon receives 921.9 mm (36.3 in) of rainfall per year, or 76.8 mm (3 in) per month.
- On average there are 140 days per year with more than 0.1 mm (0.004 in) of rainfall (precipitation) or 11.7 days with a quantity of rain, sleet, snow etc. per month.
- The driest weather is in July when an average of 16 mm (0.6 in) of rainfall (precipitation) occurs.
- The wettest weather is in December when an average of 155.7 mm (6.1 in) of rainfall (precipitation) occurs.
Precipitation Table
| Climate Variable | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | Average Precipitation mm (in) | 135.9 (5.35) | 97.8 (3.9) | 90.4 (3.6) | 60.7 (2.4) | 52.3 (2.1) | 37.6 (1.5) | 16 (0.6) | 27.7 (1.1) | 44.4 (1.7) | 67.8 (2.7) | 135.6 (5.3) | 155.7 (6.1) | 921.9 (36.3) | |
 | Precipitation Litres/m² (Gallons/ft²) | 135.9 (3.33) | 97.8 (2.4) | 90.4 (2.22) | 60.7 (1.49) | 52.3 (1.28) | 37.6 (0.92) | 16 (0.39) | 27.7 (0.68) | 44.4 (1.09) | 67.8 (1.66) | 135.6 (3.33) | 155.7 (3.82) | 921.9 (22.61) | |
 | Number of Wet Days (probability of rain on a day) | 18 (58%) | 15 (53%) | 17 (55%) | 12 (40%) | 10 (32%) | 9 (30%) | 3 (10%) | 4 (13%) | 6 (20%) | 12 (39%) | 15 (50%) | 19 (61%) | 140 (38%) | |
 | Percentage of Sunny (Cloudy) Daylight Hours | 20 (80) | 29 (71) | 34 (66) | 46 (54) | 48 (52) | 42 (58) | 69 (31) | 60 (40) | 56 (44) | 39 (61) | 31 (69) | 21 (79) | 45 (55) |