St Thomas, Ontario, Canada Climate Change Severity

48
High
The current climate change severity in St Thomas is High, with a 2.1% 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 Sep. (Historical Vs 2025) - Weather Data Only
Low
020
Moderate
40
High
60
Very High
80
Extreme
100
°C (c)

St Thomas 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), St Thomas temperature has changed by around -1.2%, and has experienced notable climate changes.

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

Comparison of Weather Condition (Historic Vs 2025)

HistoricDays

Year 2025Days

Change

sunnySunny
3815
-60.5%
cloudyCloudy
5734
-40.3%
rainyRainy
12175
-38.01%
snowySnowy
1011
10%
mistyMisty
020
100%

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

Climate Change Indicators:

Over the past 15 years, St Thomas has experienced measurable shifts in key climate parameters, contributing to the current severity score of 48 (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

48/100

High

Low
020
Moderate
40
High
60
Very High
80
Extreme
100

From 2010 to 2025, St Thomas experienced significant changes:

Temperature change of

-0.1 °C

Variation in annual rainfall

+36.9 %

Change in average humidity

+0.5 %

PM2.5 levels surged by

-15.1 %

Heatwave changed by

-4.06 day(s)

Coldwave changed by

-4.4 day(s)

Wind speeds changed by

+3.2 km/h

These indicators show that St Thomas 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 Sep.

St Thomas Weather Forecast 30 Days (October - November 2025)
St Thomas, Ontario, Canada

Condition
Temperature IconTemperature
Humidity Iconhumi.
Wind IconWind Speed
Wed. 15, Oct.
partly cloudyPartly Cloudy
Temperature Icon14°/6°
Humidity Icon72%
Wind Icon25km/h
Thu. 16, Oct.
sunnySunny
Temperature Icon17°/3°
Humidity Icon72%
Wind Icon17km/h
Fri. 17, Oct.
partly cloudyPartly Cloudy
Temperature Icon17°/4°
Humidity Icon66%
Wind Icon18km/h
Sat. 18, Oct.
moderate rainModerate rain
Temperature Icon21°/15°
Humidity Icon66%
Wind Icon27km/h
Sun. 19, Oct.
moderate rainModerate rain
Temperature Icon17°/10°
Humidity Icon88%
Wind Icon58km/h
Mon. 20, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon11°/9°
Humidity Icon75%
Wind Icon41km/h
Tue. 21, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon12°/9°
Humidity Icon82%
Wind Icon34km/h
Wed. 22, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon14°/8°
Humidity Icon80%
Wind Icon18km/h
Thu. 23, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon19°/13°
Humidity Icon79%
Wind Icon20km/h
Fri. 24, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon14°/11°
Humidity Icon76%
Wind Icon25km/h
Sat. 25, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon15°/10°
Humidity Icon69%
Wind Icon23km/h
Sun. 26, Oct.
sunnySunny
Temperature Icon14°/7°
Humidity Icon65%
Wind Icon11km/h
Mon. 27, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon17°/10°
Humidity Icon70%
Wind Icon26km/h
Tue. 28, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon12°/4°
Humidity Icon80%
Wind Icon22km/h
Wed. 29, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon11°/5°
Humidity Icon81%
Wind Icon24km/h
Thu. 30, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon10°/4°
Humidity Icon82%
Wind Icon24km/h
Fri. 31, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon11°/4°
Humidity Icon84%
Wind Icon25km/h
Sat. 1, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon9°/3°
Humidity Icon80%
Wind Icon25km/h
Sun. 2, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon10°/3°
Humidity Icon78%
Wind Icon20km/h
Mon. 3, Nov.
heavy rain at timesHeavy rain at times
Temperature Icon10°/2°
Humidity Icon76%
Wind Icon21km/h
Tue. 4, Nov.
heavy rain at timesHeavy rain at times
Temperature Icon10°/3°
Humidity Icon78%
Wind Icon22km/h
Wed. 5, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon12°/5°
Humidity Icon81%
Wind Icon23km/h
Thu. 6, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon12°/4°
Humidity Icon76%
Wind Icon24km/h
Fri. 7, Nov.
patchy rain possiblePatchy rain possible
Temperature Icon10°/3°
Humidity Icon75%
Wind Icon21km/h
Sat. 8, Nov.
patchy rain possiblePatchy rain possible
Temperature Icon10°/3°
Humidity Icon75%
Wind Icon18km/h
Sun. 9, Nov.
heavy rain at timesHeavy rain at times
Temperature Icon10°/2°
Humidity Icon77%
Wind Icon23km/h
Mon. 10, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon9°/3°
Humidity Icon79%
Wind Icon25km/h
Wed. 12, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon7°/0°
Humidity Icon75%
Wind Icon21km/h
Thu. 13, Nov.
moderate rain at timesModerate rain at times
Temperature Icon6°/0°
Humidity Icon77%
Wind Icon23km/h
Fri. 14, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon6°/0°
Humidity Icon79%
Wind Icon21km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onSat. 18, Oct.

21.3°C

Low will be onThu. 13, Nov.

-0.4°C

HumidityHumidity

High will be onSun. 19, Oct.

88%

Low will be onSun. 26, Oct.

65%

Wind SpeedWind Speed

High will be onSun. 19, Oct.

58km/h

Low will be onSun. 26, Oct.

11.2km/h

PrecipitationPrecipitation

High will be onSun. 19, Oct.

7.5mm

Low will be onThu. 23, Oct.

0.1mm

Ultraviolet IndexUV

High will be onThu. 23, Oct.

4

Low will be onWed. 12, Nov.

1

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