Currently: 30 °F. Low clouds. (Weather station: Mason City Municipal Airport, USA). See more current weatherAnnual Weather Averages in Mason City Municipal Airport
Mason City Municipal Airport is 41 miles from Union Slough National Wildlife Refuge, so the actual climate in Union Slough National Wildlife Refuge can vary a bit.
Based on weather reports collected during 1992–2021.
All Year Climate & Weather Averages in Union Slough National Wildlife Refuge
High Temp: 83 °F
Low Temp: 8 °F
Mean Temp: 46 °F
Precipitation: 2.92"
Humidity: 75%
Dew Point: 38 °F
Wind: 19 mph
Pressure: 30.03 "Hg
Visibility: 9 mi
January Climate & Weather Averages in Union Slough National Wildlife Refuge
High Temp: 25 °F
Low Temp: 8 °F
Mean Temp: 17 °F
Precipitation: 0.87"
Humidity: 82%
Dew Point: 12 °F
Wind: 21 mph
Pressure: 30.13 "Hg
Visibility: 8 mi
February Climate & Weather Averages in Union Slough National Wildlife Refuge
High Temp: 29 °F
Low Temp: 12 °F
Mean Temp: 20 °F
Precipitation: 1.13"
Humidity: 81%
Dew Point: 16 °F
Wind: 21 mph
Pressure: 30.12 "Hg
Visibility: 8 mi
March Climate & Weather Averages in Union Slough National Wildlife Refuge
High Temp: 42 °F
Low Temp: 24 °F
Mean Temp: 33 °F
Precipitation: 2.25"
Humidity: 77%
Dew Point: 26 °F
Wind: 21 mph
Pressure: 30.09 "Hg
Visibility: 8 mi
April Climate & Weather Averages in Union Slough National Wildlife Refuge
High Temp: 58 °F
Low Temp: 35 °F
Mean Temp: 46 °F
Precipitation: 3.90"
Humidity: 67%
Dew Point: 35 °F
Wind: 23 mph
Pressure: 29.97 "Hg
Visibility: 9 mi
May Climate & Weather Averages in Union Slough National Wildlife Refuge
High Temp: 70 °F
Low Temp: 47 °F
Mean Temp: 58 °F
Precipitation: 4.98"
Humidity: 67%
Dew Point: 46 °F
Wind: 20 mph
Pressure: 29.96 "Hg
Visibility: 10 mi
June Climate & Weather Averages in Union Slough National Wildlife Refuge
High Temp: 80 °F
Low Temp: 58 °F
Mean Temp: 69 °F
Precipitation: 5.43"
Humidity: 69%
Dew Point: 58 °F
Wind: 17 mph
Pressure: 29.91 "Hg
Visibility: 10 mi
July Climate & Weather Averages in Union Slough National Wildlife Refuge
High Temp: 83 °F
Low Temp: 61 °F
Mean Temp: 72 °F
Precipitation: 4.32"
Humidity: 76%
Dew Point: 63 °F
Wind: 14 mph
Pressure: 29.97 "Hg
Visibility: 9 mi
August Climate & Weather Averages in Union Slough National Wildlife Refuge
High Temp: 80 °F
Low Temp: 58 °F
Mean Temp: 69 °F
Precipitation: 3.66"
Humidity: 78%
Dew Point: 62 °F
Wind: 13 mph
Pressure: 30.00 "Hg
Visibility: 9 mi
September Climate & Weather Averages in Union Slough National Wildlife Refuge
High Temp: 75 °F
Low Temp: 49 °F
Mean Temp: 62 °F
Precipitation: 3.25"
Humidity: 73%
Dew Point: 52 °F
Wind: 15 mph
Pressure: 30.02 "Hg
Visibility: 9 mi
October Climate & Weather Averages in Union Slough National Wildlife Refuge
High Temp: 60 °F
Low Temp: 37 °F
Mean Temp: 49 °F
Precipitation: 2.46"
Humidity: 71%
Dew Point: 39 °F
Wind: 18 mph
Pressure: 30.04 "Hg
Visibility: 10 mi
November Climate & Weather Averages in Union Slough National Wildlife Refuge
High Temp: 44 °F
Low Temp: 25 °F
Mean Temp: 35 °F
Precipitation: 1.63"
Humidity: 76%
Dew Point: 27 °F
Wind: 20 mph
Pressure: 30.08 "Hg
Visibility: 9 mi
December Climate & Weather Averages in Union Slough National Wildlife Refuge
High Temp: 30 °F
Low Temp: 14 °F
Mean Temp: 22 °F
Precipitation: 1.12"
Humidity: 82%
Dew Point: 18 °F
Wind: 20 mph
Pressure: 30.09 "Hg
Visibility: 8 mi