Annual Weather Averages in Roberts Field Airport
Roberts Field Airport is 20 miles from City of Sisters, so the actual climate in City of Sisters can vary a bit.
Based on weather reports collected during 1992–2021.
All Year Climate & Weather Averages in City of Sisters
High Temp: 88 °F
Low Temp: 23 °F
Mean Temp: 48 °F
Precipitation: 0.72"
Humidity: 56%
Dew Point: 32 °F
Wind: 9 mph
Pressure: 30.05 "Hg
Visibility: 10 mi
January Climate & Weather Averages in City of Sisters
High Temp: 44 °F
Low Temp: 25 °F
Mean Temp: 34 °F
Precipitation: 0.86"
Humidity: 72%
Dew Point: 25 °F
Wind: 8 mph
Pressure: 30.13 "Hg
Visibility: 9 mi
February Climate & Weather Averages in City of Sisters
High Temp: 47 °F
Low Temp: 25 °F
Mean Temp: 36 °F
Precipitation: 0.73"
Humidity: 68%
Dew Point: 25 °F
Wind: 9 mph
Pressure: 30.09 "Hg
Visibility: 9 mi
March Climate & Weather Averages in City of Sisters
High Temp: 54 °F
Low Temp: 26 °F
Mean Temp: 40 °F
Precipitation: 0.58"
Humidity: 59%
Dew Point: 26 °F
Wind: 10 mph
Pressure: 30.05 "Hg
Visibility: 10 mi
April Climate & Weather Averages in City of Sisters
High Temp: 60 °F
Low Temp: 30 °F
Mean Temp: 45 °F
Precipitation: 0.73"
Humidity: 56%
Dew Point: 29 °F
Wind: 10 mph
Pressure: 30.03 "Hg
Visibility: 10 mi
May Climate & Weather Averages in City of Sisters
High Temp: 69 °F
Low Temp: 36 °F
Mean Temp: 53 °F
Precipitation: 1.16"
Humidity: 52%
Dew Point: 35 °F
Wind: 10 mph
Pressure: 29.99 "Hg
Visibility: 10 mi
June Climate & Weather Averages in City of Sisters
High Temp: 77 °F
Low Temp: 42 °F
Mean Temp: 59 °F
Precipitation: 0.64"
Humidity: 47%
Dew Point: 38 °F
Wind: 10 mph
Pressure: 29.98 "Hg
Visibility: 10 mi
July Climate & Weather Averages in City of Sisters
High Temp: 88 °F
Low Temp: 47 °F
Mean Temp: 67 °F
Precipitation: 0.38"
Humidity: 39%
Dew Point: 41 °F
Wind: 9 mph
Pressure: 29.98 "Hg
Visibility: 10 mi
August Climate & Weather Averages in City of Sisters
High Temp: 87 °F
Low Temp: 46 °F
Mean Temp: 66 °F
Precipitation: 0.45"
Humidity: 40%
Dew Point: 40 °F
Wind: 8 mph
Pressure: 29.97 "Hg
Visibility: 10 mi
September Climate & Weather Averages in City of Sisters
High Temp: 78 °F
Low Temp: 39 °F
Mean Temp: 59 °F
Precipitation: 0.42"
Humidity: 45%
Dew Point: 36 °F
Wind: 7 mph
Pressure: 30.01 "Hg
Visibility: 10 mi
October Climate & Weather Averages in City of Sisters
High Temp: 64 °F
Low Temp: 32 °F
Mean Temp: 48 °F
Precipitation: 0.74"
Humidity: 56%
Dew Point: 32 °F
Wind: 7 mph
Pressure: 30.08 "Hg
Visibility: 10 mi
November Climate & Weather Averages in City of Sisters
High Temp: 51 °F
Low Temp: 27 °F
Mean Temp: 39 °F
Precipitation: 0.85"
Humidity: 68%
Dew Point: 28 °F
Wind: 9 mph
Pressure: 30.11 "Hg
Visibility: 10 mi
December Climate & Weather Averages in City of Sisters
High Temp: 43 °F
Low Temp: 23 °F
Mean Temp: 33 °F
Precipitation: 1.04"
Humidity: 74%
Dew Point: 25 °F
Wind: 9 mph
Pressure: 30.14 "Hg
Visibility: 9 mi