Ross Island, Portland, OR Weather - Forecast & Monthly Averages

TEMPERATURE	51
HUMIDITY	79
PRESSURE	99660
WIND COND.	210 31.7

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Weather Quick Facts

The highest monthly average temperature in Ross Island for August is 69.5 degrees
The lowest monthly average temperature in Ross Island for December is 39.9 degrees
The most monthly precipitation in Ross Island occurs in November with 6.2 inches
The air quality index in Ross Island is 10% better than the national average
The pollution index in Ross Island is 789% worse than the national average

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Ross Island Average Temperature

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
Month	Temp. _(min)	Temp. _(max)	Temp. _(avg)	Precipitation
January	34°F	48°F	40°F	4.9"
February	36°F	53°F	43°F	3.4"
March	39°F	58°F	48°F	4.8"
April	42°F	63°F	52°F	3.0"
May	48°F	71°F	58°F	2.8"
June	53°F	76°F	63°F	1.7"
July	57°F	84°F	69°F	0.5"
August	58°F	85°F	70°F	0.5"
September	53°F	78°F	64°F	1.8"
October	47°F	66°F	55°F	3.7"
November	40°F	55°F	47°F	6.2"
December	34°F	47°F	40°F	6.2"

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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.
Index	Ross Island	Portland	Oregon
Air quality index	38	38	32
Pollution index	24,235,400	1,899,410	7,156,356

Ross Island air quality

Measurement	Total
Days measured	365
Days with good air quality	285
Days with moderate air quality	77
Days w/ poor A.Q. for sensitive groups	3
Days with unhealthy air quality	0

Air quality details

Pollutant	Total
Arsenic	0.003%
Benzene	0.020%
Carbon Tetrachloride	0.010%
Lead	0.010%
Mercury	0.002%

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	Population	Air Quality Index	National Avg.
Troutdale, OR	16,433	38	24.0%
Orchards, WA	26,289	38	24.0%
Garden Home-Whitford, OR	7,295	38	24.0%
Lake Oswego, OR	39,476	38	24.0%
Oatfield, OR	13,588	38	24.0%
Portland, OR	650,380	38	24.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Memphis, TN	650,910	45	10.0%
Oklahoma City, OK	649,821	48	4.0%
Las Vegas, NV	644,594	54	8.0%
Nashville, TN	667,070	45	10.0%
Detroit, MI	672,351	56	12.0%
Portland, OR	650,380	38	24.0%

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.