TODAY MAY15
TEMPERATURE
HUMIDITY
PRESSURE
WIND COND.
  • 8154Sat30%
  • 8552Sun
  • 8551Mon
  • 8552Tue
  • 8049Wed
daynightWeather update from Lincoln Regional Karl Harder Field at

Key findings

  • The highest monthly average temperature in Rio Oso for July is 79.4 degrees
  • The lowest monthly average temperature in Rio Oso for January is 43.5 degrees
  • The most monthly precipitation in Rio Oso occurs in December with 10 inches
  • The air quality index in Rio Oso is 12% better than the national average
  • The pollution index in Rio Oso is 34% better than the national average

Compare Rio Oso, CA Weather

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      Rio Oso Average Temperature

      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
      January34°F55°F44°F5.5"
      February42°F62°F51°F6.6"
      March43°F71°F56°F3.9"
      April44°F74°F58°F3.7"
      May51°F84°F67°F3.6"
      June55°F90°F72°F2.5"
      July61°F99°F79°F0.6"
      August59°F97°F77°F0.0"
      September53°F87°F68°F1.0"
      October48°F78°F61°F3.0"
      November41°F68°F53°F4.2"
      December38°F57°F47°F10.0"

      Rio Oso 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.
      IndexRio OsoCaliforniaNational
      Air quality index445550
      Pollution index3,319,12018,106,7265,066,862

      Rio Oso air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality239
      Days with moderate air quality124
      Days w/ poor A.Q. for sensitive groups2
      Days with unhealthy air quality0

      Rio Oso air quality information

      PollutantTotal
      Arsenic0.100%
      Benzene0.040%
      Carbon Tetrachloride0.000%
      Lead0.070%
      Mercury0.120%

      Average monthly Rio Oso temperature with heat index

      Rio Oso monthly precipitation with daily maximum

      Rio Oso monthly snow depth with daily maximum

      Rio Oso monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Marysville, CA12,1764412%
      Linda, CA18,5954412%
      Nicolaus, CA2054412%
      Sutter, CA3,2044412%
      Olivehurst, CA13,7554412%
      Rio Oso, CA4414412%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Fredonia (Biscoe), AR4414510%
      Yah-ta-hey, NM4411766%
      Wilcox, NE4411962%
      South Wayne, WI4412942%
      Towanda, IL4414412%
      Rio Oso, CA4414412%
      Source: The Rio Oso, CA 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.