St Thomas, Ontario, Canada Climate Change Severity

43
High
The current climate change severity in St Thomas is High, with a 10.7% improvement in the climate score compared to last 15 years. This suggests improved conditions, with more favorable environmental indicators and a reduction in negative impacts.
Data: Jan. to Oct. (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 -0.7%, and has experienced notable climate changes.

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

Comparison of Weather Condition (Historic Vs 2025)

HistoricDays

Year 2025Days

Change

sunnySunny
4118
-56.09%
cloudyCloudy
6339
-38.09%
rainyRainy
13681
-40.4%
snowySnowy
1011
10%
mistyMisty
025
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 43 (within the High severity category). While the score remains High, certain factors have improved over time. Here’s a breakdown of the specific changes observed:

Severity Score

43/100

High

Low
020
Moderate
40
High
60
Very High
80
Extreme
100

From 2010 to 2025, St Thomas experienced significant changes:

Temperature change of

-0.07 °C

Variation in annual rainfall

+27.05 %

Change in average humidity

+0.5 %

PM2.5 levels surged by

-14.5 %

Heatwave changed by

-5.6 day(s)

Coldwave changed by

-4.8 day(s)

Wind speeds changed by

+3.07 km/h

These indicators show improvement in key parametes of climate, but St Thomas remains in the High severity category. Continuous focus on climate resilience is necessary to avoid further worsening and ensure sustainability.

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

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

Condition
Temperature IconTemperature
Humidity Iconhumi.
Wind IconWind Speed
Wed. 5, Nov.
patchy rain possiblePatchy rain nearby
Temperature Icon12°/6°
Humidity Icon78%
Wind Icon47km/h
Thu. 6, Nov.
partly cloudyPartly Cloudy
Temperature Icon8°/1°
Humidity Icon77%
Wind Icon30km/h
Fri. 7, Nov.
heavy rainHeavy rain
Temperature Icon10°/6°
Humidity Icon82%
Wind Icon35km/h
Sat. 8, Nov.
patchy rain possiblePatchy rain nearby
Temperature Icon8°/3°
Humidity Icon74%
Wind Icon25km/h
Sun. 9, Nov.
moderate rainModerate rain
Temperature Icon3°/-1°
Humidity Icon86%
Wind Icon33km/h
Mon. 10, Nov.
partly cloudyPartly Cloudy
Temperature Icon4°/-3°
Humidity Icon75%
Wind Icon32km/h
Tue. 11, Nov.
partly cloudyPartly Cloudy
Temperature Icon4°/0°
Humidity Icon72%
Wind Icon29km/h
Wed. 12, Nov.
patchy rain possiblePatchy rain nearby
Temperature Icon6°/3°
Humidity Icon84%
Wind Icon32km/h
Thu. 13, Nov.
patchy rain possiblePatchy rain nearby
Temperature Icon5°/1°
Humidity Icon83%
Wind Icon31km/h
Fri. 14, Nov.
patchy rain possiblePatchy rain nearby
Temperature Icon5°/0°
Humidity Icon73%
Wind Icon24km/h
Sat. 15, Nov.
patchy rain possiblePatchy rain nearby
Temperature Icon8°/1°
Humidity Icon73%
Wind Icon38km/h
Sun. 16, Nov.
patchy rain possiblePatchy rain nearby
Temperature Icon6°/1°
Humidity Icon86%
Wind Icon29km/h
Mon. 17, Nov.
light freezing rainLight freezing rain
Temperature Icon3°/-1°
Humidity Icon71%
Wind Icon26km/h
Tue. 18, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon7°/0°
Humidity Icon81%
Wind Icon24km/h
Wed. 19, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon6°/-1°
Humidity Icon80%
Wind Icon25km/h
Thu. 20, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon5°/-1°
Humidity Icon79%
Wind Icon26km/h
Fri. 21, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon5°/-1°
Humidity Icon82%
Wind Icon25km/h
Sun. 23, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon5°/-2°
Humidity Icon82%
Wind Icon24km/h
Mon. 24, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon5°/-1°
Humidity Icon83%
Wind Icon25km/h
Tue. 25, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon5°/0°
Humidity Icon85%
Wind Icon23km/h
Wed. 26, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon6°/1°
Humidity Icon82%
Wind Icon24km/h
Thu. 27, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon4°/-1°
Humidity Icon83%
Wind Icon26km/h
Fri. 28, Nov.
patchy moderate snowPatchy moderate snow
Temperature Icon3°/-1°
Humidity Icon79%
Wind Icon23km/h
Sat. 29, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon4°/-1°
Humidity Icon83%
Wind Icon23km/h
Sun. 30, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon4°/-1°
Humidity Icon87%
Wind Icon25km/h
Mon. 1, Dec.
moderate or heavy snow showersModerate or heavy snow showers
Temperature Icon3°/-2°
Humidity Icon86%
Wind Icon25km/h
Tue. 2, Dec.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon5°/0°
Humidity Icon83%
Wind Icon22km/h
Wed. 3, Dec.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon4°/-1°
Humidity Icon85%
Wind Icon23km/h
Thu. 4, Dec.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon3°/-1°
Humidity Icon82%
Wind Icon25km/h
Fri. 5, Dec.
moderate or heavy snow showersModerate or heavy snow showers
Temperature Icon3°/-2°
Humidity Icon79%
Wind Icon25km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onWed. 5, Nov.

11.5°C

Low will be onMon. 10, Nov.

-3.1°C

HumidityHumidity

High will be onSun. 30, Nov.

87%

Low will be onMon. 17, Nov.

71%

Wind SpeedWind Speed

High will be onWed. 5, Nov.

46.8km/h

Low will be onTue. 2, Dec.

22.3km/h

PrecipitationPrecipitation

High will be onFri. 7, Nov.

24.04mm

Low will be onMon. 10, Nov.

0.01mm

Ultraviolet IndexUV

High will be onMon. 10, Nov.

2

Low will be onWed. 12, Nov.

1

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