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Ontario city, Oregon

Official LSAD Designation: Ontario city • Census GEOID: 4154900 • Malheur County

Climate Normals & Weather Observations

30-year climate normals (1991–2020) and weather observations for Ontario city.

Reference Weather Station: ONTARIO KSRV, OR US (ID: USC00356294) • Located 1.3 miles from community center • Elevation: 653.8 m
Month Average High (°F) Average Low (°F) Mean Temp (°F) Precipitation (in)
January 35.8° 22.7° 29.2° 1.30"
February 43.6° 25.9° 34.8° 0.79"
March 55.7° 32.0° 43.9° 1.00"
April 63.2° 37.8° 50.5° 0.87"
May 73.6° 46.7° 60.2° 1.41"
June 82.3° 54.1° 68.2° 0.68"
July 93.4° 60.1° 76.8° 0.25"
August 91.4° 57.0° 74.2° 0.10"
September 80.9° 47.3° 64.1° 0.34"
October 64.6° 36.0° 50.3° 0.77"
November 47.3° 27.6° 37.4° 0.90"
December 36.3° 22.3° 29.3° 1.58"

Annual Temperature History

2010–2025, completed calendar years only.

NOAA station ONTARIO KSRV, OR US (ID: USC00356294) • 1.3 miles from community center .

This is the same reference station used for monthly normals.

Annual mean Annual mean of daily highs Annual mean of daily lows
Annual temperature history at ONTARIO KSRV, OR US Year is the horizontal axis. Annual mean temperature in degrees Fahrenheit is the vertical axis. Dots show recorded years; lines connect consecutive available years only. Missing years are gaps, with no interpolation. Optional dashed lines show annual mean of daily highs and lows. Exact values appear in the data table below. 34.0 42.3 50.5 58.8 67.0 2010 2014 2018 2021 2025 Year Annual mean temperature (°F) 2010: Annual mean 50.9°F 2010: Annual mean of daily highs 64.2°F 2010: Annual mean of daily lows 37.6°F

Source: NOAA NCEI Global Summary of the Year.

Annual temperature data table (°F)
Annual station temperatures, 2010–2025. Unavailable means no reported value.
Year Annual mean (°F) Annual mean of daily highs (°F) Annual mean of daily lows (°F)
2010 50.9 64.2 37.6
2011 Unavailable Unavailable Unavailable
2012 Unavailable Unavailable Unavailable
2013 Unavailable Unavailable Unavailable
2014 Unavailable Unavailable Unavailable
2015 Unavailable Unavailable Unavailable
2016 Unavailable Unavailable Unavailable
2017 Unavailable Unavailable Unavailable
2018 Unavailable Unavailable Unavailable
2019 Unavailable Unavailable Unavailable
2020 Unavailable Unavailable Unavailable
2021 Unavailable Unavailable Unavailable
2022 Unavailable Unavailable Unavailable
2023 Unavailable Unavailable Unavailable
2024 Unavailable Unavailable Unavailable
2025 Unavailable Unavailable Unavailable
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.