Annual Weather Averages Near Brockville
Averages are for Grenadier Island, which is 14 miles from Brockville.
Based on weather reports collected during 1992–2021.
All Year Climate & Weather Averages in Brockville
High Temp: 80 °F
Low Temp: 12 °F
Mean Temp: 47 °F
Precipitation: 2.33"
Humidity: 77%
Dew Point: 38 °F
Wind: 12 mph
Pressure: 30.00 "Hg
Visibility: 9 mi
January Climate & Weather Averages in Brockville
High Temp: 29 °F
Low Temp: 12 °F
Mean Temp: 21 °F
Precipitation: 1.48"
Humidity: 81%
Dew Point: 14 °F
Wind: 13 mph
Pressure: 30.03 "Hg
Visibility: 8 mi
February Climate & Weather Averages in Brockville
High Temp: 31 °F
Low Temp: 14 °F
Mean Temp: 22 °F
Precipitation: 1.19"
Humidity: 77%
Dew Point: 15 °F
Wind: 12 mph
Pressure: 30.02 "Hg
Visibility: 8 mi
March Climate & Weather Averages in Brockville
High Temp: 40 °F
Low Temp: 22 °F
Mean Temp: 31 °F
Precipitation: 1.58"
Humidity: 72%
Dew Point: 22 °F
Wind: 13 mph
Pressure: 30.03 "Hg
Visibility: 8 mi
April Climate & Weather Averages in Brockville
High Temp: 54 °F
Low Temp: 35 °F
Mean Temp: 44 °F
Precipitation: 1.95"
Humidity: 68%
Dew Point: 32 °F
Wind: 13 mph
Pressure: 29.96 "Hg
Visibility: 9 mi
May Climate & Weather Averages in Brockville
High Temp: 67 °F
Low Temp: 46 °F
Mean Temp: 56 °F
Precipitation: 3.05"
Humidity: 70%
Dew Point: 46 °F
Wind: 11 mph
Pressure: 29.97 "Hg
Visibility: 9 mi
June Climate & Weather Averages in Brockville
High Temp: 75 °F
Low Temp: 55 °F
Mean Temp: 65 °F
Precipitation: 3.52"
Humidity: 76%
Dew Point: 57 °F
Wind: 10 mph
Pressure: 29.93 "Hg
Visibility: 9 mi
July Climate & Weather Averages in Brockville
High Temp: 80 °F
Low Temp: 61 °F
Mean Temp: 70 °F
Precipitation: 3.83"
Humidity: 77%
Dew Point: 62 °F
Wind: 10 mph
Pressure: 29.93 "Hg
Visibility: 9 mi
August Climate & Weather Averages in Brockville
High Temp: 79 °F
Low Temp: 60 °F
Mean Temp: 69 °F
Precipitation: 3.48"
Humidity: 78%
Dew Point: 61 °F
Wind: 9 mph
Pressure: 29.98 "Hg
Visibility: 9 mi
September Climate & Weather Averages in Brockville
High Temp: 72 °F
Low Temp: 53 °F
Mean Temp: 62 °F
Precipitation: 2.54"
Humidity: 80%
Dew Point: 55 °F
Wind: 10 mph
Pressure: 30.03 "Hg
Visibility: 9 mi
October Climate & Weather Averages in Brockville
High Temp: 59 °F
Low Temp: 42 °F
Mean Temp: 50 °F
Precipitation: 2.44"
Humidity: 79%
Dew Point: 43 °F
Wind: 12 mph
Pressure: 30.02 "Hg
Visibility: 9 mi
November Climate & Weather Averages in Brockville
High Temp: 46 °F
Low Temp: 32 °F
Mean Temp: 39 °F
Precipitation: 1.64"
Humidity: 79%
Dew Point: 32 °F
Wind: 13 mph
Pressure: 30.04 "Hg
Visibility: 8 mi
December Climate & Weather Averages in Brockville
High Temp: 35 °F
Low Temp: 22 °F
Mean Temp: 28 °F
Precipitation: 1.27"
Humidity: 83%
Dew Point: 22 °F
Wind: 13 mph
Pressure: 30.02 "Hg
Visibility: 8 mi