TODAY JUL20
TEMPERATURE56
HUMIDITY72
PRESSURE30.2
WIND COND.340 3.4
  • 7956Fri
  • 8360Sat
  • 9465Sun
  • 9866Mon
  • 9764Tue
daynightWeather update from Portland, Portland International Airport at

Ross Island Average Weather

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
January19°F66°F41°F5.1"
February22°F65°F43°F2.0"
March28°F75°F47°F3.5"
April31°F83°F51°F2.6"
May37°F95°F59°F2.9"
June46°F102°F63°F1.4"
July51°F106°F70°F0.4"
August48°F102°F68°F0.6"
September41°F95°F64°F1.1"
October30°F78°F54°F2.6"
November27°F67°F47°F6.1"
December12°F63°F39°F5.2"

Did you know?

  • The highest monthly average temperature in Ross Island for July is 70 degrees.
  • The lowest monthly average temperature in Ross Island for December is 39 degrees.
  • The most monthly precipitation in Ross Island occurs in November with 6.1 inches.
  • The air quality index in Ross Island is 23% better than the national average.
  • The pollution index in Ross Island is 378% worse than the national average.

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Compare Portland, OR Weather To Other Cities

Ross Island air quality index & pollution index

In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
IndexRoss IslandPortlandOregon
Air quality index383832
Pollution index24,235,4001,899,4105,374,527

Ross Island air quality information

MeasurementTotal
Days measured365
Days with good air quality241
Days with moderate air quality108
Days w/ poor A.Q. for sensitive groups12
Days with unhealthy air quality4

Ross Island air quality information

PollutantTotal
Arsenic0.003%
Benzene0.020%
Carbon Tetrachloride0.010%
Lead0.010%
Mercury0.002%

Average monthly Ross Island temperature with heat index

Ross Island monthly precipitation with daily maximum

Ross Island monthly snow depth with daily maximum

Ross Island monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Beaverton, OR94,8653824%
Cedar Mill, OR15,9933824%
Garden Home-Whitford, OR6,2913824%
Jennings Lodge, OR7,7273824%
Maywood Park, OR9393824%
Portland, OR620,5893824%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Baltimore, MD621,000468%
Oklahoma City, OK620,015476%
Las Vegas, NV613,295548%
Louisville, KY611,5735510%
Milwaukee, WI598,6724510%
Portland, OR620,5893824%
Source: The Ross Island, Portland, OR weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.