Thunder Bay, Ontario, Canada Climate Change Severity

52
High
The current climate change severity in Thunder Bay is High, with a 7.8% 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 Oct. (Historical Vs 2025) - Weather Data Only
Low
020
Moderate
40
High
60
Very High
80
Extreme
100
°C (c)

Thunder Bay 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), Thunder Bay temperature has changed by around +6.2%, 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
4625
-45.6%
cloudyCloudy
8065
-18.7%
rainyRainy
9950
-49.4%
snowySnowy
1216
33.3%
mistyMisty
020
100%

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

Climate Change Indicators:

Over the past 15 years, Thunder Bay 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, Thunder Bay experienced significant changes:

Temperature change of

+0.3 °C

Variation in annual rainfall

+103.4 %

Change in average humidity

-5.3 %

PM2.5 levels surged by

-0.1 %

Heatwave changed by

-2.5 day(s)

Coldwave changed by

-11.2 day(s)

Wind speeds changed by

-0.6 km/h

These indicators show that Thunder Bay 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 Oct.

Thunder Bay Weather Forecast 30 Days (November - December 2025)
Thunder Bay, Ontario, Canada

Condition
Temperature IconTemperature
Humidity Iconhumi.
Wind IconWind Speed
Wed. 26, Nov.
moderate snowModerate snow
Temperature Icon-1°/-4°
Humidity Icon79%
Wind Icon35km/h
Thu. 27, Nov.
overcastOvercast
Temperature Icon-2°/-5°
Humidity Icon65%
Wind Icon32km/h
Fri. 28, Nov.
sunnySunny
Temperature Icon-2°/-9°
Humidity Icon59%
Wind Icon25km/h
Sat. 29, Nov.
light freezing rainLight freezing rain
Temperature Icon-4°/-8°
Humidity Icon71%
Wind Icon14km/h
Sun. 30, Nov.
light freezing rainLight freezing rain
Temperature Icon-6°/-12°
Humidity Icon79%
Wind Icon19km/h
Mon. 1, Dec.
sunnySunny
Temperature Icon-11°/-13°
Humidity Icon56%
Wind Icon19km/h
Tue. 2, Dec.
partly cloudyPartly Cloudy
Temperature Icon-8°/-15°
Humidity Icon65%
Wind Icon11km/h
Wed. 3, Dec.
sunnySunny
Temperature Icon-10°/-14°
Humidity Icon68%
Wind Icon12km/h
Thu. 4, Dec.
cloudyCloudy
Temperature Icon-3°/-12°
Humidity Icon80%
Wind Icon27km/h
Fri. 5, Dec.
light snowLight snow
Temperature Icon1°/-4°
Humidity Icon80%
Wind Icon30km/h
Sat. 6, Dec.
light snowLight snow
Temperature Icon0°/-7°
Humidity Icon88%
Wind Icon12km/h
Sun. 7, Dec.
partly cloudyPartly Cloudy
Temperature Icon-7°/-10°
Humidity Icon77%
Wind Icon20km/h
Mon. 8, Dec.
partly cloudyPartly Cloudy
Temperature Icon2°/-5°
Humidity Icon76%
Wind Icon28km/h
Tue. 9, Dec.
partly cloudyPartly Cloudy
Temperature Icon0°/-2°
Humidity Icon74%
Wind Icon25km/h
Wed. 10, Dec.
moderate snowModerate snow
Temperature Icon-6°/-11°
Humidity Icon85%
Wind Icon20km/h
Thu. 11, Dec.
light freezing rainLight freezing rain
Temperature Icon-6°/-12°
Humidity Icon86%
Wind Icon21km/h
Fri. 12, Dec.
light freezing rainLight freezing rain
Temperature Icon-6°/-12°
Humidity Icon85%
Wind Icon20km/h
Sat. 13, Dec.
moderate snowModerate snow
Temperature Icon-5°/-11°
Humidity Icon86%
Wind Icon21km/h
Sun. 14, Dec.
patchy moderate snowPatchy moderate snow
Temperature Icon-4°/-10°
Humidity Icon86%
Wind Icon22km/h
Mon. 15, Dec.
moderate or heavy snow showersModerate or heavy snow showers
Temperature Icon-4°/-10°
Humidity Icon87%
Wind Icon25km/h
Tue. 16, Dec.
moderate or heavy snow showersModerate or heavy snow showers
Temperature Icon-4°/-10°
Humidity Icon87%
Wind Icon22km/h
Wed. 17, Dec.
light freezing rainLight freezing rain
Temperature Icon-5°/-11°
Humidity Icon84%
Wind Icon22km/h
Thu. 18, Dec.
patchy moderate snowPatchy moderate snow
Temperature Icon-5°/-12°
Humidity Icon84%
Wind Icon20km/h
Fri. 19, Dec.
light freezing rainLight freezing rain
Temperature Icon-5°/-12°
Humidity Icon83%
Wind Icon20km/h
Sat. 20, Dec.
moderate snowModerate snow
Temperature Icon-4°/-11°
Humidity Icon84%
Wind Icon22km/h
Sun. 21, Dec.
patchy moderate snowPatchy moderate snow
Temperature Icon-6°/-10°
Humidity Icon87%
Wind Icon20km/h
Mon. 22, Dec.
moderate snowModerate snow
Temperature Icon-4°/-9°
Humidity Icon89%
Wind Icon19km/h
Tue. 23, Dec.
moderate or heavy snow showersModerate or heavy snow showers
Temperature Icon-4°/-9°
Humidity Icon90%
Wind Icon21km/h
Wed. 24, Dec.
moderate or heavy snow showersModerate or heavy snow showers
Temperature Icon-4°/-10°
Humidity Icon89%
Wind Icon22km/h
Thu. 25, Dec.
moderate or heavy snow showersModerate or heavy snow showers
Temperature Icon-5°/-10°
Humidity Icon88%
Wind Icon22km/h
Fri. 26, Dec.
moderate or heavy snow showersModerate or heavy snow showers
Temperature Icon-6°/-11°
Humidity Icon88%
Wind Icon20km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onMon. 8, Dec.

1.7°C

Low will be onTue. 2, Dec.

-14.7°C

HumidityHumidity

High will be onTue. 23, Dec.

90%

Low will be onMon. 1, Dec.

56%

Wind SpeedWind Speed

High will be onWed. 26, Nov.

35.3km/h

Low will be onTue. 2, Dec.

11.2km/h

PrecipitationPrecipitation

High will be onWed. 26, Nov.

13.1mm

Low will be onTue. 9, Dec.

0.01mm

Ultraviolet IndexUV

High will be onMon. 1, Dec.

2

Low will be onSun. 30, Nov.

1

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