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June, July, August and September account for a combined 4.19 inches (106 mm) of total rainfall – only 11% of the 36.91 in (938 mm) of annual precipitation. The warmest month is August, with an average high temperature of 82.3 °F (27.9 °C).
Average monthly precipitation (in mm) for selected cities in North America City Country ... Portland: United States: 938 128 93 101 73 64 41 13 14 39 87 138 147
Climate data for Portland (Köppen Csb/Csa) [a] [b] Month Jan ... Mean monthly sunshine hours: 85.6 116.4 191.1 ... Average precipitation days (≥ 0.01 in) 10.5 9.8 11.0
The heaviest snowfalls in Oregon occur in the Cascade Range.. Snowfall in Oregon is greatest in the Cascade Range. Based on data from ski resorts and a few official weather stations, average annual snowfall in the Cascades can range from 300 to 550 inches (760 to 1,400 cm). [3]
The historical average rainfall for the month of December is 5.72 inches in Seattle and 5.77 inches in Portland," explained AccuWeather Meteorologist Elizabeth Danco.
Conversely, at the northern end of the valley, Portland is 50 feet (15 m) above sea level and receives only 36 inches (910 mm) per year. Most rainfall occurs from October to May, and it tends to be heaviest between November and January, when disturbances coming from the Pacific Ocean are at their most intense. Growing seasons are long ...
Dwa = Monsoon-influenced hot-summer humid continental climate; coldest month averaging below 0 °C (32 °F) (or −3 °C (26.6 °F)), at least one month's average temperature above 22 °C (71.6 °F), and at least four months averaging above 10 °C (50 °F). At least ten times as much rain in the wettest month of summer as in the driest month of ...
In November 2006, the Greater Vancouver region experienced above-average levels of rainfall and snowfall, breaking the previously established record of 18.1 cm (7.1 in) when 25.5 cm (10.0 in) of rain fell within the first 16 days of the month. [44]
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