Johnstown (ON) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Johnstown.
Climate overview of Johnstown
Johnstown, Ontario, Canada, experiences significant temperature variation throughout the year. Summers bring daytime highs of 27°C (81°F) in July, while winters cool to -3°C (27°F) in February.
Rain/snowfall is high, totalling around 1056 mm (42 in) per year. October is the wettest month and March the driest.
Johnstown Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Johnstown — and find the best time to visit.
Monthly Temperature in Johnstown
Depending on the time of the year, temperatures range from comfortable to very cold in Johnstown. Average maximum daytime temperatures range from a comfortable 27°C (81°F) in July, the warmest time of the year, to a very cold -3°C (27°F) during cooler months like February.
At night, you can expect temperatures ranging from 16°C (61°F) in July to around -12°C (10°F) during February.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Johnstown
Johnstown has a relatively rain/snowy climate with high precipitation levels, averaging 1056 mm (42 in) of rain/snowfall annually. While rainfall varies throughout the year, each season offers its own charm. October brings wetter days averaging 118 mm (4.6 in) of precipitation, spread over 16 rainy days.
In contrast, the driest month March experiences a drier climate, with about 61 mm (2.4 in) of snow/rainfall spread across 13 snowy/rainy days. For more details, please visit our Johnstown Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Johnstown
Rainfall during this time ranges from 82 mm (3.2 in) in May to 116 mm (4.6 in) in June. This means you can expect a mix of sunny days and occasional showers. Looking for inspiration on where to travel this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
Frequently asked questions about the climate in Johnstown
What is the best time to visit Johnstown?
May, August and September typically offer the most optimal weather in Johnstown. In contrast, January, February, March, November and December tend to have less optimal conditions.
What temperatures can I expect in Johnstown?
Daytime highs range from -3°C (27°F) in February to 27°C (81°F) in July. Nighttime lows range from -12°C (10°F) to 16°C (61°F). Temperatures vary considerably through the year.
How much rain does Johnstown get?
Annual rainfall is around 1056 mm (42 in). October is the wettest month with 118 mm (4.6 in), while March is the driest with 61 mm (2.4 in).
Johnstown 3-Day Forecast
Johnstown (ON) 3-Day Forecast
Johnstown on the map
Johnstown is highlighted — select any city to see its climate.
Popular this month
Where to go in July — average daytime high across popular destinations.
Niagara Falls
27°C (81°F) Montréal28°C (82°F) Ottawa27°C (81°F) Quebec City
26°C (79°F) Toronto26°C (79°F) Calgary24°C (75°F) Vancouver22°C (72°F) Whistler
19°C (66°F) 
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
The 5 most beautiful lakes in Canada
Explore Canada's stunning lakes: Lake Louise, Lake Superior, Maligne Lake, Emerald Lake, and Lake Okanagan, each offering unique beauty and activities.
Canoeing the south Nahannii
The South Nahanni in the northwest of Canada is one of the most impressive wilderness rivers in the world. Canoeing the south Nahanni is something you must add to your bucket list.
See Polar Bears in Churchill Canada
Thousands of bears gather at the small town of Churchill. In the evening the northern lights give a light show against the dark evening sky. An unforgettable experience.
Banff National Park
Snowy mountains, clear blue lakes and green forests make Banff National Park a wonderful bucket list destination. The pristine wilderness is a mecca for walkers.