Cornwall, Ontario, Canada Climate Change Severity

52
High
The current climate change severity in Cornwall is High, with a 12.06% worsening in the climate score compared to last 15 years. This suggests deteriorating conditions, with increasing negative impacts on weather patterns and environmental conditions.
Data: Jan. to Jun. (Historical Vs 2025) - Weather Data Only
Low
020
Moderate
40
High
60
Very High
80
Extreme
100
°C

Cornwall Weather Condition Changes (Historic Vs 2025)

2025
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Historic
2025

Over the past 15 year(s), Cornwall temperature has changed by around +4.5%, and has experienced notable climate changes.

Sunny
Cloudy
Rainy
Snowy
Misty
Data: Jan. to Jun. (Historical Vs 2025)

Comparison of Weather Condition (Historic Vs 2025)

HistoricDays

Year 2025Days

Change

sunnySunny
1710
-41.1%
cloudyCloudy
3822
-42.1%
rainyRainy
7264
-11.1%
snowySnowy
1216
33.3%
mistyMisty
05
100%

Disclaimer: Other weather conditions not shown may affect the total day count.

Climate Change Indicators:

Over the past 15 years, Cornwall has experienced measurable shifts in key climate parameters, contributing to the current severity score of 52 (within the High severity category). This suggests worsening climate conditions from the previous years. Here’s a breakdown of the specific changes observed:

Severity Score

52/100

High

Low
020
Moderate
40
High
60
Very High
80
Extreme
100

From 2010 to 2025, Cornwall experienced significant changes:

Temperature change of

+0.1 °C

Variation in annual rainfall

+48.8 %

Change in average humidity

-7.8 %

PM2.5 levels surged by

-31.2 %

Heatwave changed by

-1 day(s)

Coldwave changed by

-5.4 day(s)

Wind speeds changed by

+1.7 km/h

These indicators show that Cornwall is experiencing a more volatile and extreme climate, reinforcing the need for urgent intervention to mitigate risks. As the severity score rises, focus must shift to adaptation and emergency preparedness.

Check how we calculate Climate Change Severity
Based on data from Jan. to Jun.

Cornwall Weather Forecast 30 Days (July - August 2025)
Cornwall, Ontario, Canada

Condition
Temperature IconTemperature
Humidity Iconhumi.
Wind IconWind Speed
Thu. 31, Jul.
overcastOvercast
Temperature Icon24°/12°
Humidity Icon65%
Wind Icon13km/h
Fri. 1, Aug.
sunnySunny
Temperature Icon25°/12°
Humidity Icon62%
Wind Icon13km/h
Sat. 2, Aug.
sunnySunny
Temperature Icon28°/9°
Humidity Icon58%
Wind Icon22km/h
Sun. 3, Aug.
sunnySunny
Temperature Icon32°/16°
Humidity Icon49%
Wind Icon19km/h
Mon. 4, Aug.
sunnySunny
Temperature Icon31°/15°
Humidity Icon59%
Wind Icon7km/h
Tue. 5, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon32°/17°
Humidity Icon65%
Wind Icon9km/h
Wed. 6, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon33°/17°
Humidity Icon62%
Wind Icon9km/h
Thu. 7, Aug.
sunnySunny
Temperature Icon33°/18°
Humidity Icon48%
Wind Icon17km/h
Fri. 8, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon25°/18°
Humidity Icon89%
Wind Icon23km/h
Sat. 9, Aug.
partly cloudyPartly Cloudy
Temperature Icon28°/17°
Humidity Icon67%
Wind Icon13km/h
Sun. 10, Aug.
sunnySunny
Temperature Icon31°/14°
Humidity Icon54%
Wind Icon9km/h
Mon. 11, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon34°/18°
Humidity Icon64%
Wind Icon15km/h
Tue. 12, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon24°/17°
Humidity Icon87%
Wind Icon19km/h
Wed. 13, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon19°/10°
Humidity Icon58%
Wind Icon18km/h
Thu. 14, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon25°/15°
Humidity Icon79%
Wind Icon15km/h
Fri. 15, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon25°/15°
Humidity Icon80%
Wind Icon13km/h
Sat. 16, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon25°/15°
Humidity Icon79%
Wind Icon13km/h
Sun. 17, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon26°/16°
Humidity Icon80%
Wind Icon14km/h
Mon. 18, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon25°/16°
Humidity Icon82%
Wind Icon14km/h
Tue. 19, Aug.
moderate rain at timesModerate rain at times
Temperature Icon25°/15°
Humidity Icon77%
Wind Icon15km/h
Wed. 20, Aug.
heavy rain at timesHeavy rain at times
Temperature Icon27°/15°
Humidity Icon75%
Wind Icon14km/h
Thu. 21, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon25°/16°
Humidity Icon82%
Wind Icon16km/h
Fri. 22, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon24°/15°
Humidity Icon83%
Wind Icon15km/h
Sat. 23, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon24°/14°
Humidity Icon80%
Wind Icon15km/h
Sun. 24, Aug.
heavy rain at timesHeavy rain at times
Temperature Icon26°/15°
Humidity Icon77%
Wind Icon14km/h
Mon. 25, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon25°/15°
Humidity Icon77%
Wind Icon14km/h
Tue. 26, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon24°/15°
Humidity Icon80%
Wind Icon17km/h
Wed. 27, Aug.
heavy rain at timesHeavy rain at times
Temperature Icon23°/14°
Humidity Icon76%
Wind Icon13km/h
Thu. 28, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon23°/14°
Humidity Icon80%
Wind Icon17km/h
Fri. 29, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon24°/14°
Humidity Icon82%
Wind Icon17km/h
Sat. 30, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon24°/14°
Humidity Icon78%
Wind Icon19km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onMon. 11, Aug.

33.8°C

Low will be onSat. 2, Aug.

9.1°C

HumidityHumidity

High will be onFri. 8, Aug.

89%

Low will be onThu. 7, Aug.

48%

Wind SpeedWind Speed

High will be onFri. 8, Aug.

23.4km/h

Low will be onMon. 4, Aug.

7.2km/h

PrecipitationPrecipitation

High will be onThu. 21, Aug.

7.9mm

Low will be onWed. 6, Aug.

0.1mm

Ultraviolet IndexUV

High will be onThu. 7, Aug.

7

Low will be onSun. 3, Aug.

0.1

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