Johnstown, Ontario

Area Small historic community in eastern Ontario

Riverside community on the St. Lawrence near Brockville; visitors come for boating, fishing, marina access and short trips into Thousand Islands boating routes.

Main image
Johnstown, Ontario
Johnstown, Ontario, Canada
44.7334, -75.4660

How to Get to Johnstown, Ontario #

Johnstown is reachable by car from nearby regional centers in eastern Ontario. Nearest major roads and towns vary-use provincial maps or GPS for precise driving directions.

Tips for Visiting Johnstown, Ontario #

  • Johnstown's small-town archives and municipal offices can help with genealogical inquiries-call ahead to access records.
  • Explore local riverside paths-small museums and historic plaques often sit near civic squares.
  • Check local event calendars for fairs and community activities that reveal living culture.

Best Time to Visit Johnstown, Ontario #

Summer and early autumn offer the most pleasant conditions for visiting small Ontario towns.

Summer
June-August · 60-80°F (15-27°C)
Best for festivals, outdoor exploring and comfortable weather.
Fall
September-October · 40-60°F (4-16°C)
Crisp air and autumn color-quieter than summer.

Weather & Climate near Johnstown, Ontario #

Climate

Johnstown, Ontario's climate is classified as Warm-Summer Continental - Warm-Summer Continental climate with warm summers (peaking in July) and freezing winters (coldest in January). Temperatures range from -14°C to 26°C. Moderate rainfall (873 mm/year).

Temperature & Rainfall
Temperature Range
27°
Warmest Month
-14°
Coldest Month
Monthly Conditions

January

January is the coldest month with highs of -4°C and lows of -14°C. Moderate rainfall (60 mm).

Comfort

-9°
Feels Like Freezing
-9°C
Temperature
-14° -4°

Weather

60 mm
Rainfall
3.6 m/s
Wind
Light Breeze

February

February is freezing with highs of -3°C and lows of -13°C. Moderate rainfall (52 mm).

Comfort

-8°
Feels Like Freezing
-8°C
Temperature
-13° -3°

Weather

52 mm
Rainfall
3.6 m/s
Wind
Light Breeze

March

March is freezing with highs of 3°C and lows of -7°C. Moderate rainfall (55 mm).

Comfort

-2°
Feels Like Freezing
-2°C
Temperature
-7°

Weather

55 mm
Rainfall
3.7 m/s
Wind
Light Breeze

April

April is cold with highs of 10°C and lows of 1°C. Moderate rainfall (71 mm).

Comfort

Feels Like Cold
C
Temperature
11°

Weather

71 mm
Rainfall
3.9 m/s
Wind
Light Breeze

May

May is cool with highs of 18°C and lows of 7°C. Moderate rainfall (71 mm).

Comfort

13°
Feels Like Cool
13°C
Temperature
18°

Weather

71 mm
Rainfall
3.3 m/s
Wind
Light Breeze

June

June is cool with highs of 23°C and lows of 12°C. Moderate rainfall (75 mm).

Comfort

18°
Feels Like Cool
18°C
Temperature
12° 23°

Weather

75 mm
Rainfall
2.9 m/s
Wind
Calm

July

July is the warmest month with highs of 26°C and lows of 15°C. Regular rainfall (81 mm).

Comfort

21°
Feels Like Mild
21°C
Temperature
15° 27°

Weather

81 mm
Rainfall
2.7 m/s
Wind
Calm

August

August is mild with highs of 25°C and lows of 14°C. Regular rainfall (92 mm).

Comfort

20°
Feels Like Mild
20°C
Temperature
14° 25°

Weather

92 mm
Rainfall
2.5 m/s
Wind
Calm

September

September is cool with highs of 20°C and lows of 10°C. The wettest month with 93 mm of rain.

Comfort

15°
Feels Like Cool
15°C
Temperature
10° 20°

Weather

93 mm
Rainfall
2.8 m/s
Wind
Calm

October

October is cold with highs of 14°C and lows of 4°C. Moderate rainfall (74 mm).

Comfort

Feels Like Cold
C
Temperature
14°

Weather

74 mm
Rainfall
3.2 m/s
Wind
Light Breeze

November

November is cold with highs of 6°C and lows of -1°C. Regular rainfall (80 mm).

Comfort

Feels Like Cold
C
Temperature
-1°

Weather

80 mm
Rainfall
3.6 m/s
Wind
Light Breeze

December

December is freezing with highs of -1°C and lows of -9°C. Moderate rainfall (69 mm).

Comfort

-5°
Feels Like Freezing
-5°C
Temperature
-9° -1°

Weather

69 mm
Rainfall
3.6 m/s
Wind
Light Breeze

Nearby Attractions to Johnstown, Ontario