Thunder Bay, Ontario, Canada Climate Change Severity

Very High

The current climate change severity in Thunder Bay is Very High, with a 26.2% worsening in the climate score compared to last 16 years. This suggests deteriorating conditions, with increasing negative impacts on weather patterns and environmental conditions.

Data: Jan. to Sep. (Historical Vs 2026) - Weather Data Only

Low

020

Moderate

2040

High

4060

Very High

6080

Extreme

80100

°C

Thunder Bay Climate Change Analysis

Real-time Weather

All Years

Temperature (°C)

Years

Years	Min Temp.	Avg Temp.	Max Temp.
	-14.2741935483871	-11.241935483870964	-8.27741935483871
	-13.171428571428574	-9.978571428571431	-6.510714285714285
	-2.599999999999999	0.6580645161290322	4.032258064516129
	1.5266666666666666	5.5	9.580000000000002
	6.403225806451613	10.1	13.990322580645158
2010	10.770000000000001	13.986666666666663	17.293333333333333
	15.774193548387096	19.306451612903224	22.835483870967746
	15.600000000000001	19.361290322580647	23.177419354838715
	8.236666666666666	11.12	14.336666666666666
	4.4645161290322575	7.329032258064518	10.554838709677421
	-2.9700000000000006	-0.06666666666666671	2.4100000000000015
	-12.88064516129032	-10.138709677419355	-7.4387096774193555
	-18.98064516129032	-15.845161290322581	-12.483870967741936
	-15.47857142857143	-11.925	-8.246428571428572
	-10.267741935483869	-6.8677419354838705	-3.5322580645161286
	-2.263333333333333	0.6633333333333334	3.57
	3.9548387096774196	7.870967741935484	11.86451612903226
2011	8.780000000000001	12.533333333333335	16.28
	15.238709677419354	19.125806451612902	22.880645161290325
	15.25483870967742	19.235483870967748	23.067741935483877
	9.896666666666668	13.629999999999997	17.506666666666668
	6.025806451612903	8.52258064516129	11.21290322580645
	-1.4166666666666665	0.9133333333333336	3.3500000000000005
	-8.803225806451612	-5.825806451612904	-2.641935483870968
	-13.138709677419355	-9.422580645161291	-6.029032258064516
	-10.162068965517244	-6.83793103448276	-3.8620689655172415
	-2.841935483870969	0.15161290322580734	3.1935483870967736
	-0.7333333333333336	2.9199999999999995	6.79
	5.8354838709677415	9.75483870967742	13.835483870967744
2012	11.286666666666667	15.753333333333332	20.033333333333335
	16.22258064516129	20.38709677419355	24.55806451612903
	14.641935483870965	18.548387096774192	22.6258064516129
	9.1	12.63	16.343333333333334
	2.9451612903225803	5.458064516129031	7.987096774193548
	-3.6899999999999995	-1.2033333333333331	1.4733333333333327
	-8.980645161290322	-6.609677419354839	-3.7903225806451615
	-15.32903225806452	-11.661290322580646	-8.364516129032259
	-15.721428571428573	-12.432142857142855	-8.867857142857144
	-10.490322580645163	-7.090322580645162	-3.906451612903226
	-3.896666666666667	-1.0666666666666662	1.5266666666666668
	2.4	6.293548387096774	10.309677419354838
2013	8.196666666666667	12.839999999999998	17.386666666666663
	12.567741935483868	16.258064516129036	19.85806451612903
	14.267741935483869	17.93870967741935	21.880645161290317
	10.373333333333331	13.830000000000005	17.12
	3.9741935483870963	6.454838709677419	9.012903225806449
	-4.653333333333333	-2.05	0.5166666666666665
	-18.716129032258067	-15.235483870967741	-11.429032258064517
	-21.641935483870967	-17.522580645161295	-13.309677419354836
	-18.79642857142857	-15.5	-12.246428571428567
	-13.538709677419353	-9.322580645161294	-5.7870967741935475
	-3.8166666666666678	-0.8666666666666665	2.0166666666666666
	4.116129032258065	7.851612903225806	12.074193548387099
2014	7.950000000000003	11.97	16.183333333333334
	11.964516129032255	15.941935483870969	19.951612903225808
	12.35483870967742	15.758064516129032	19.31935483870968
	7.986666666666666	11.536666666666669	15.056666666666667
	3.1387096774193552	5.538709677419354	7.909677419354839
	-7.6899999999999995	-5.1800000000000015	-2.636666666666667
	-9.190322580645162	-6.525806451612904	-4.2129032258064525
	-17.54516129032258	-13.241935483870968	-9.309677419354841
	-22.35357142857143	-18.49285714285714	-14.303571428571429
	-8.503225806451615	-5.029032258064516	-1.4903225806451617
	-1.7633333333333334	1.6866666666666668	5.266666666666667
	4.129032258064516	8.52258064516129	13.02258064516129
2015	8.233333333333334	12.553333333333335	17.256666666666668
	13.296774193548387	17.616129032258065	21.712903225806457
	13.39032258064516	17.058064516129033	21.316129032258065
	11.823333333333334	15.156666666666666	18.756666666666664
	4.329032258064517	6.861290322580646	9.583870967741934
	0.36000000000000065	2.416666666666666	4.696666666666667
	-4.687096774193549	-2.774193548387097	-0.8741935483870968
	-13.448387096774194	-10.251612903225805	-7.032258064516129
	-14.16896551724138	-9.844827586206899	-5.886206896551724
	-5.990322580645162	-2.887096774193548	0.07096774193548418
	-3.11	0.1600000000000001	3.473333333333334
	4.564516129032257	8.899999999999999	12.977419354838712
2016	9.409999999999998	13.423333333333328	17.293333333333333
	13.761290322580649	17.783870967741937	21.822580645161292
	15.016129032258064	18.919354838709676	23.151612903225807
	12.183333333333335	15.216666666666667	18.69666666666667
	5.719354838709677	8.012903225806452	10.590322580645159
	1.1500000000000001	3.54	6.026666666666666
	-10.816129032258065	-8.003225806451614	-5.316129032258063
	-11.603225806451613	-8.587096774193547	-5.199999999999998
	-10.639285714285716	-7.167857142857144	-3.9035714285714285
	-8.548387096774198	-4.922580645161291	-1.0870967741935489
	-0.75	3.016666666666666	7.173333333333334
	3.435483870967742	7.322580645161291	11.341935483870966
2017	9.559999999999997	13.953333333333335	18.240000000000002
	12.925806451612903	17.248387096774195	21.577419354838717
	12.829032258064514	16.338709677419352	20.206451612903226
	10.743333333333332	13.956666666666667	17.626666666666665
	5.448387096774194	8.138709677419355	11.038709677419355
	-6.109999999999999	-2.816666666666667	0.4599999999999999
	-14.854838709677418	-11.62258064516129	-8.103225806451613
	-16.174193548387098	-11.996774193548388	-7.590322580645162
	-16.396428571428576	-12.539285714285713	-8.782142857142855
	-8.519354838709676	-5.022580645161291	-1.774193548387097
	-5.043333333333334	-0.6866666666666661	3.7633333333333328
	5.100000000000001	10.216129032258065	15.35161290322581
2018	9.37	13.493333333333334	17.860000000000003
	14.61935483870968	18.674193548387095	22.877419354838707
	13.306451612903224	17.30322580645161	21.632258064516133
	9.636666666666663	12.916666666666664	16.520000000000003
	1.3419354838709676	3.709677419354838	6.125806451612904
	-6.796666666666668	-4.166666666666667	-1.6033333333333337
	-8.903225806451612	-6.035483870967742	-3.0096774193548383
	-18.567741935483873	-14.51290322580645	-10.899999999999999
	-16.564285714285717	-12.664285714285715	-9.024999999999999
	-8.929032258064519	-5.090322580645161	-1.283870967741936
	-1.380000000000001	2.176666666666667	5.953333333333333
	2.8645161290322587	6.890322580645161	11.032258064516125
2019	8.486666666666666	12.913333333333332	17.089999999999996
	13.98709677419355	18.39032258064516	23.05161290322581
	13.59354838709677	16.874193548387094	20.451612903225804
	10.456666666666667	13.01333333333333	15.926666666666666
	3.5419354838709687	5.819354838709678	8.241935483870966
	-5.9333333333333345	-3.479999999999999	-0.9600000000000003
	-11.732258064516131	-8.145161290322582	-4.858064516129032
	-12.07741935483871	-8.570967741935485	-5.438709677419355
	-15.072413793103447	-10.637931034482758	-6.56206896551724
	-6.719354838709678	-3.3354838709677415	-0.17419354838709677
	-2.58	0.7333333333333333	4.170000000000001
	4.003225806451613	8.103225806451615	12.283870967741937
2020	10.553333333333335	14.793333333333333	18.94333333333334
	15.09032258064516	19.25161290322581	23.316129032258058
	14.248387096774193	17.58709677419355	21.216129032258063
	8.773333333333335	12.060000000000002	15.756666666666668
	0.567741935483871	3.1999999999999993	6.316129032258064
	-2.94	0.33999999999999986	3.3699999999999997
	-10.635483870967743	-7.141935483870967	-3.8548387096774195
	-11.651612903225805	-8.158064516129032	-4.903225806451612
	-17.439285714285717	-13.775	-10.064285714285718
	-6.7354838709677445	-2.2580645161290325	1.7806451612903225
	-0.5833333333333333	3.103333333333333	6.889999999999999
	4.503225806451613	8.764516129032257	12.951612903225806
2021	11.49	15.873333333333335	19.990000000000002
	14.961290322580645	19.138709677419357	23.4
	15.516129032258062	19.203225806451616	23.125806451612906
	11.19	14.489999999999998	18.563333333333336
	7.674193548387097	10.103225806451613	13.01290322580645
	-2.4866666666666664	0.20333333333333303	3.0300000000000002
	-11.370967741935484	-7.161290322580645	-2.9258064516129028
	-21.200000000000003	-16.206451612903226	-11.312903225806451
	-20.242857142857144	-14.753571428571432	-9.874999999999996
	-9.664516129032258	-5.938709677419354	-2.1709677419354847
	-3.1933333333333334	-0.43000000000000027	2.2400000000000007
	4.183870967741936	8.070967741935481	12.261290322580644
2022	9.076666666666666	13.726666666666667	18.42
	12.6	16.890322580645165	21.23870967741935
	13.767741935483873	17.37741935483871	21.63548387096774
	10.283333333333331	13.613333333333335	17.93666666666667
	3.9193548387096766	7.1161290322580655	10.806451612903228
	-3.0466666666666664	-0.5266666666666666	2.1566666666666663
	-10.967741935483868	-7.896774193548389	-4.699999999999999
	-12.161290322580646	-8.996774193548386	-6.038709677419355
	-14.475000000000003	-9.889285714285714	-5.764285714285714
	-9.764516129032256	-5.748387096774194	-1.3548387096774193
	-2.8000000000000003	0.32000000000000006	3.6600000000000006
	5.109677419354839	9.21935483870968	13.716129032258065
2023	10.496666666666668	14.659999999999998	18.89666666666666
	12.561290322580641	16.32903225806452	20.361290322580647
	13.041935483870972	16.929032258064517	21.393548387096775
	11.390000000000004	14.85	19.430000000000003
	4.290322580645161	7.048387096774196	10.099999999999996
	-3.516666666666666	-0.4366666666666667	2.963333333333334
	-4.216129032258065	-1.4903225806451617	1.2677419354838708
	-11.24193548387097	-8.583870967741934	-5.670967741935486
	-9.282758620689656	-5.551724137931036	-1.9379310344827587
	-5.94516129032258	-2.6354838709677417	0.8129032258064516
	-0.5499999999999997	2.7100000000000004	6.1133333333333315
	5.348387096774195	8.929032258064517	12.777419354838708
2024	9.543333333333333	13.170000000000003	16.916666666666664
	13.854838709677422	17.890322580645158	22.003225806451614
	14.14516129032258	17.84193548387097	21.95806451612903
	11.963333333333333	16.08	20.920000000000005
	5.874193548387097	9.277419354838708	13.225806451612902
	0.5800000000000002	2.7199999999999993	4.846666666666666
	-8.319354838709677	-5.67741935483871	-3.048387096774194
	-15.538709677419357	-12.009677419354837	-8.606451612903225
	-15.264285714285714	-11.203571428571433	-7.1642857142857155
	-7.429032258064517	-3.4419354838709677	0.6806451612903224
	-2.0100000000000002	1.4833333333333334	5.079999999999999
	4.77741935483871	9.180645161290322	13.748387096774197
2025	9.243333333333334	13.253333333333334	17.77
	13.190322580645162	17.287096774193547	22.2741935483871
	13.109677419354838	17.35161290322581	21.81935483870968
	10.930000000000001	13.786666666666667	17.393333333333334
	6.746666666666667	9.809999999999999	13.039999999999997
	-2.0000000000000004	0.3433333333333331	2.94
	-12.967741935483875	-8.922580645161291	-5.087096774193549
	-16.758064516129032	-13.161290322580646	-9.261290322580646
	-12.200000000000001	-8.425	-4.707142857142858
	-8.14193548387097	-4.2935483870967746	-0.6838709677419356
	-2.476666666666667	2.15	6.719999999999998
	2.258064516129033	9.067741935483872	16.21290322580645
2026	9.66	16.229999999999997	23.31666666666667
	14.55483870967742	21.683870967741935	29.664516129032254
	12.103225806451613	18.419354838709676	24.993548387096777
	11.786666666666664	15.006666666666666	18.470000000000006

Max Temp.

Avg Temp.

Min Temp.

Thunder Bay Weather Condition Changes (Historic Vs 2026)

2026

Historic

2026

Over the past 16 year(s), Thunder Bay temperature has changed by around +24.8%, and has experienced notable climate changes.

Sunny

Cloudy

Rainy

Snowy

Misty

Data: Jan. to Sep. (Historical Vs 2026)

Comparison of Weather Condition (Historic Vs 2026)

Sunny

41108

163.4%

Cloudy

7115

-78.8%

Rainy

8350

-39.7%

Snowy

1221

75%

Misty

113

1200%

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

Climate Change Indicators:

Over the past 16 years, Thunder Bay has experienced measurable shifts in key climate parameters, contributing to the current severity score of 62 (within the Very High severity category). This suggests worsening climate conditions from the previous years. Here’s a breakdown of the specific changes observed:

Severity Score

62/100

Very High

Low

020

Moderate

2040

High

4060

Very High

6080

Extreme

80100

From 2010 to 2026, Thunder Bay experienced significant changes:

Temperature change of

+1.25 °C

Variation in annual rainfall

+80.62 %

Change in average humidity

-8.15 %

PM2.5 levels surged by

+13.93 %

Heatwave changed by

-5 Days

Coldwave changed by

-9 Days

Wind speeds changed by

-0.32 km/h

These indicators show a dramatic increase in volatility and worsening conditions. Thunder Bay's Very High severity status requires urgent and immediate adaptation and mitigation strategies, particularly focused on managing extreme weather events, improving air quality, and ensuring water resources are adequate for the population.

Check how we calculate Climate Change Severity

Based on data from Jan. to Sep.

Thunder Bay Weather Forecast 30 Days (October - November 2026)
Thunder Bay, Ontario, Canada

Condition

Temperature

Humi.

Wind Speed

Fri. 2, Oct.

Sunny

16°/5°

60%

27.7km/h

Sat. 3, Oct.

Overcast

12°/8°

69%

30.6km/h

Sun. 4, Oct.

Sunny

14°/8°

70%

35.6km/h

Mon. 5, Oct.

Sunny

10°/2°

60%

18km/h

Tue. 6, Oct.

Cloudy

13°/6°

69%

24.1km/h

Wed. 7, Oct.

Overcast

17°/12°

70%

23.4km/h

Thu. 8, Oct.

Overcast

15°/8°

61%

23km/h

Fri. 9, Oct.

Cloudy

12°/4°

54%

24.8km/h

Sat. 10, Oct.

Rain Showers

12°/6°

77%

22.1km/h

Sun. 11, Oct.

Rain Showers

12°/6°

80%

20.4km/h

Mon. 12, Oct.

Rain Showers

11°/6°

79%

20.3km/h

Tue. 13, Oct.

Rain Showers

10°/5°

76%

19.4km/h

Wed. 14, Oct.

Rain Showers

9°/3°

76%

19.6km/h

Thu. 15, Oct.

Rain Showers

9°/4°

76%

19.3km/h

Fri. 16, Oct.

Rain

9°/3°

74%

21km/h

Sat. 17, Oct.

Rain Showers

9°/3°

74%

21.8km/h

Sun. 18, Oct.

Rain

10°/4°

74%

21.3km/h

Mon. 19, Oct.

Heavy Rain

10°/4°

76%

20km/h

Tue. 20, Oct.

Rain

9°/3°

74%

17.9km/h

Wed. 21, Oct.

Rain Showers

8°/3°

79%

19.8km/h

Thu. 22, Oct.

Heavy Rain

9°/3°

79%

18km/h

Fri. 23, Oct.

Rain Showers

7°/3°

82%

20.4km/h

Sat. 24, Oct.

Rain Showers

8°/3°

80%

19.5km/h

Sun. 25, Oct.

Rain Showers

7°/2°

75%

18.7km/h

Mon. 26, Oct.

Rain Showers

6°/2°

79%

21.4km/h

Tue. 27, Oct.

Rain Showers

6°/1°

82%

22.7km/h

Wed. 28, Oct.

Rain Showers

6°/2°

82%

20.6km/h

Thu. 29, Oct.

Heavy Rain

6°/1°

80%

17.7km/h

Fri. 30, Oct.

Rain Showers

6°/1°

79%

18.8km/h

Sat. 31, Oct.

Heavy Rain

5°/0°

77%

21.9km/h

Sun. 1, Nov.

Rain

5°/0°

74%

19.1km/h

Highest & Lowest Weather Forecasts

Temperature

High will be onWed. 7, Oct.

17°C

Low will be onSun. 1, Nov.

0°C

Humidity

High will be onFri. 23, Oct.

82%

Low will be onFri. 9, Oct.

54%

Wind Speed

High will be onSun. 4, Oct.

35.6km/h

Low will be onThu. 29, Oct.

17.7km/h

Precipitation

High will be onWed. 21, Oct.

8.8mm

Low will be onFri. 2, Oct.

0.04mm

High will be onWed. 7, Oct.

Low will be onSat. 3, Oct.

0.9

Our Blogs

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Thunder Bay Weather Condition Changes (Historic Vs 2026)

Comparison of Weather Condition (Historic Vs 2026)

Climate Change Indicators:

Severity Score

From 2010 to 2026, Thunder Bay experienced significant changes:

Thunder Bay Weather Forecast 30 Days (October - November 2026)
Thunder Bay, Ontario, Canada

Highest & Lowest Weather Forecasts

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Thunder Bay Weather Condition Changes (Historic Vs 2026)

Comparison of Weather Condition (Historic Vs 2026)

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Thunder Bay Weather Forecast 30 Days (October - November 2026)Thunder Bay, Ontario, Canada

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Why AQI Standards Vary Across the World - And Why Air Quality Index Matters More Than Ever

Why Winter Suffocates and Monsoon Saves Delhi Air Quality 2025?

Thunder Bay Weather Forecast 30 Days (October - November 2026)
Thunder Bay, Ontario, Canada