Annual Weather Averages Near Brockville
Averages are for Grenadier Island, which is 14 miles from Brockville.
Based on weather reports collected during 1985–2015.
All Year Climate & Weather Averages in Brockville
High Temp: 80 °F
Low Temp: 11 °F
Mean Temp: 46 °F
Precipitation: 0.99"
Humidity: 77%
Dew Point: 38 °F
Wind: 6 mph
Pressure: 30.00 "Hg
Visibility: 9 mi
January Climate & Weather Averages in Brockville
High Temp: 29 °F
Low Temp: 11 °F
Mean Temp: 20 °F
Precipitation: 0.55"
Humidity: 82%
Dew Point: 14 °F
Wind: 7 mph
Pressure: 30.02 "Hg
Visibility: 8 mi
February Climate & Weather Averages in Brockville
High Temp: 30 °F
Low Temp: 12 °F
Mean Temp: 21 °F
Precipitation: 0.53"
Humidity: 78%
Dew Point: 15 °F
Wind: 6 mph
Pressure: 30.03 "Hg
Visibility: 8 mi
March Climate & Weather Averages in Brockville
High Temp: 40 °F
Low Temp: 22 °F
Mean Temp: 31 °F
Precipitation: 0.43"
Humidity: 73%
Dew Point: 22 °F
Wind: 7 mph
Pressure: 30.03 "Hg
Visibility: 8 mi
April Climate & Weather Averages in Brockville
High Temp: 54 °F
Low Temp: 35 °F
Mean Temp: 45 °F
Precipitation: 0.91"
Humidity: 69%
Dew Point: 33 °F
Wind: 7 mph
Pressure: 29.96 "Hg
Visibility: 9 mi
May Climate & Weather Averages in Brockville
High Temp: 67 °F
Low Temp: 47 °F
Mean Temp: 57 °F
Precipitation: 1.22"
Humidity: 71%
Dew Point: 46 °F
Wind: 6 mph
Pressure: 29.97 "Hg
Visibility: 9 mi
June Climate & Weather Averages in Brockville
High Temp: 75 °F
Low Temp: 56 °F
Mean Temp: 65 °F
Precipitation: 1.46"
Humidity: 77%
Dew Point: 57 °F
Wind: 5 mph
Pressure: 29.94 "Hg
Visibility: 9 mi
July Climate & Weather Averages in Brockville
High Temp: 80 °F
Low Temp: 61 °F
Mean Temp: 70 °F
Precipitation: 1.16"
Humidity: 76%
Dew Point: 62 °F
Wind: 5 mph
Pressure: 29.94 "Hg
Visibility: 9 mi
August Climate & Weather Averages in Brockville
High Temp: 79 °F
Low Temp: 59 °F
Mean Temp: 69 °F
Precipitation: 1.34"
Humidity: 77%
Dew Point: 61 °F
Wind: 5 mph
Pressure: 29.99 "Hg
Visibility: 9 mi
September Climate & Weather Averages in Brockville
High Temp: 71 °F
Low Temp: 52 °F
Mean Temp: 62 °F
Precipitation: 1.42"
Humidity: 80%
Dew Point: 54 °F
Wind: 6 mph
Pressure: 30.03 "Hg
Visibility: 9 mi
October Climate & Weather Averages in Brockville
High Temp: 58 °F
Low Temp: 41 °F
Mean Temp: 49 °F
Precipitation: 1.33"
Humidity: 79%
Dew Point: 42 °F
Wind: 6 mph
Pressure: 30.02 "Hg
Visibility: 9 mi
November Climate & Weather Averages in Brockville
High Temp: 46 °F
Low Temp: 31 °F
Mean Temp: 39 °F
Precipitation: 0.92"
Humidity: 80%
Dew Point: 32 °F
Wind: 7 mph
Pressure: 30.03 "Hg
Visibility: 8 mi
December Climate & Weather Averages in Brockville
High Temp: 34 °F
Low Temp: 20 °F
Mean Temp: 27 °F
Precipitation: 0.60"
Humidity: 84%
Dew Point: 22 °F
Wind: 7 mph
Pressure: 30.03 "Hg
Visibility: 8 mi