Hamilton, Ontario, Canada Climate Change Severity

48
High
The current climate change severity in Hamilton is High, with a 10.000000000000004% 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 Nov. (Historical Vs 2025) - Weather Data Only
Low
020
Moderate
40
High
60
Very High
80
Extreme
100
°C (c)

Hamilton 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), Hamilton temperature has changed by around +1.5%, and has experienced notable climate changes.

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

Comparison of Weather Condition (Historic Vs 2025)

HistoricDays

Year 2025Days

Change

sunnySunny
5124
-52.9%
cloudyCloudy
8585
0%
rainyRainy
13793
-32.1%
snowySnowy
911
22.2%
mistyMisty
017
100%

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

Climate Change Indicators:

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

48/100

High

Low
020
Moderate
40
High
60
Very High
80
Extreme
100

From 2010 to 2025, Hamilton experienced significant changes:

Temperature change of

+0.1 °C

Variation in annual rainfall

+40.4 %

Change in average humidity

+0.5 %

PM2.5 levels surged by

-20.4 %

Heatwave changed by

-1.1 day(s)

Coldwave changed by

-11.06 day(s)

Wind speeds changed by

+0.7 km/h

These indicators show improvement in key parametes of climate, but Hamilton 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 Nov.

Hamilton Weather Forecast 30 Days (December - January 2026)
Hamilton, Ontario, Canada

Condition
Temperature IconTemperature
Humidity Iconhumi.
Wind IconWind Speed
Tue. 9, Dec.
moderate snowModerate snow
Temperature Icon0°/-9°
Humidity Icon77%
Wind Icon31km/h
Wed. 10, Dec.
heavy rainHeavy rain
Temperature Icon4°/-2°
Humidity Icon90%
Wind Icon31km/h
Thu. 11, Dec.
cloudyCloudy
Temperature Icon0°/-5°
Humidity Icon81%
Wind Icon27km/h
Fri. 12, Dec.
light freezing rainLight freezing rain
Temperature Icon-1°/-7°
Humidity Icon89%
Wind Icon20km/h
Sat. 13, Dec.
light freezing rainLight freezing rain
Temperature Icon-5°/-7°
Humidity Icon84%
Wind Icon28km/h
Sun. 14, Dec.
overcastOvercast
Temperature Icon-7°/-11°
Humidity Icon77%
Wind Icon31km/h
Mon. 15, Dec.
cloudyCloudy
Temperature Icon-5°/-13°
Humidity Icon85%
Wind Icon14km/h
Tue. 16, Dec.
partly cloudyPartly Cloudy
Temperature Icon-4°/-9°
Humidity Icon86%
Wind Icon9km/h
Wed. 17, Dec.
overcastOvercast
Temperature Icon0°/-10°
Humidity Icon83%
Wind Icon35km/h
Thu. 18, Dec.
overcastOvercast
Temperature Icon2°/1°
Humidity Icon83%
Wind Icon32km/h
Fri. 19, Dec.
patchy rain possiblePatchy rain nearby
Temperature Icon3°/-2°
Humidity Icon82%
Wind Icon43km/h
Sat. 20, Dec.
cloudyCloudy
Temperature Icon-5°/-6°
Humidity Icon63%
Wind Icon25km/h
Sun. 21, Dec.
cloudyCloudy
Temperature Icon-3°/-5°
Humidity Icon73%
Wind Icon19km/h
Mon. 22, Dec.
moderate or heavy snow showersModerate or heavy snow showers
Temperature Icon2°/-2°
Humidity Icon82%
Wind Icon24km/h
Tue. 23, Dec.
moderate or heavy snow showersModerate or heavy snow showers
Temperature Icon3°/-2°
Humidity Icon83%
Wind Icon25km/h
Wed. 24, Dec.
moderate or heavy snow showersModerate or heavy snow showers
Temperature Icon2°/-2°
Humidity Icon84%
Wind Icon26km/h
Thu. 25, Dec.
moderate or heavy snow showersModerate or heavy snow showers
Temperature Icon2°/-3°
Humidity Icon85%
Wind Icon23km/h
Fri. 26, Dec.
moderate or heavy snow showersModerate or heavy snow showers
Temperature Icon2°/-3°
Humidity Icon86%
Wind Icon25km/h
Sat. 27, Dec.
moderate or heavy snow showersModerate or heavy snow showers
Temperature Icon2°/-3°
Humidity Icon87%
Wind Icon25km/h
Sun. 28, Dec.
moderate or heavy snow showersModerate or heavy snow showers
Temperature Icon2°/-3°
Humidity Icon86%
Wind Icon25km/h
Mon. 29, Dec.
moderate or heavy snow showersModerate or heavy snow showers
Temperature Icon2°/-3°
Humidity Icon85%
Wind Icon25km/h
Tue. 30, Dec.
moderate or heavy snow showersModerate or heavy snow showers
Temperature Icon2°/-3°
Humidity Icon84%
Wind Icon25km/h
Wed. 31, Dec.
moderate or heavy snow showersModerate or heavy snow showers
Temperature Icon1°/-3°
Humidity Icon85%
Wind Icon23km/h
Thu. 1, Jan.
moderate or heavy snow showersModerate or heavy snow showers
Temperature Icon1°/-4°
Humidity Icon82%
Wind Icon27km/h
Fri. 2, Jan.
moderate or heavy snow showersModerate or heavy snow showers
Temperature Icon0°/-5°
Humidity Icon81%
Wind Icon27km/h
Sat. 3, Jan.
moderate or heavy snow showersModerate or heavy snow showers
Temperature Icon-1°/-6°
Humidity Icon84%
Wind Icon24km/h
Sun. 4, Jan.
moderate or heavy snow showersModerate or heavy snow showers
Temperature Icon0°/-5°
Humidity Icon82%
Wind Icon26km/h
Mon. 5, Jan.
moderate snowModerate snow
Temperature Icon-1°/-6°
Humidity Icon83%
Wind Icon25km/h
Tue. 6, Jan.
patchy moderate snowPatchy moderate snow
Temperature Icon-1°/-6°
Humidity Icon81%
Wind Icon25km/h
Wed. 7, Jan.
moderate snowModerate snow
Temperature Icon-1°/-7°
Humidity Icon79%
Wind Icon25km/h
Thu. 8, Jan.
moderate snowModerate snow
Temperature Icon-1°/-6°
Humidity Icon79%
Wind Icon25km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onWed. 10, Dec.

3.5°C

Low will be onMon. 15, Dec.

-13.2°C

HumidityHumidity

High will be onWed. 10, Dec.

90%

Low will be onSat. 20, Dec.

63%

Wind SpeedWind Speed

High will be onFri. 19, Dec.

42.5km/h

Low will be onTue. 16, Dec.

8.6km/h

PrecipitationPrecipitation

High will be onWed. 10, Dec.

25.2mm

Low will be onSun. 14, Dec.

0.01mm

Ultraviolet IndexUV

High will be onTue. 16, Dec.

2

Low will be onSun. 14, Dec.

1

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