Hartford, Connecticut, United States Climate Change Severity

43
High
The current climate change severity in Hartford is High, with a -13.6% 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 Jul. (Historical Vs 2025) - Weather Data Only
Low
020
Moderate
40
High
60
Very High
80
Extreme
100
°C

Hartford 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), Hartford temperature has changed by around +4.7%, and has experienced notable climate changes.

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

Comparison of Weather Condition (Historic Vs 2025)

HistoricDays

Year 2025Days

Change

sunnySunny
3725
-32.4%
cloudyCloudy
5843
-25.8%
rainyRainy
7863
-19.2%
snowySnowy
74
-42.8%
mistyMisty
011
100%

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

Climate Change Indicators:

Over the past 15 years, Hartford 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, Hartford experienced significant changes:

Temperature change of

+0.4 °C

Variation in annual rainfall

+35.8 %

Change in average humidity

-1.6 %

PM2.5 levels surged by

-15.1 %

Heatwave changed by

+2.06 day(s)

Coldwave changed by

-5.3 day(s)

Wind speeds changed by

+0.7 km/h

These indicators show improvement in key parametes of climate, but Hartford 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 Jul.

Hartford Weather Forecast 30 Days (August - September 2025)
Hartford, Connecticut, United States

Condition
Temperature IconTemperature
Humidity Iconhumi.
Wind IconWind Speed
Mon. 11, Aug.
sunnySunny
Temperature Icon35°/21°
Humidity Icon51%
Wind Icon15km/h
Tue. 12, Aug.
sunnySunny
Temperature Icon34°/20°
Humidity Icon68%
Wind Icon16km/h
Wed. 13, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon34°/21°
Humidity Icon85%
Wind Icon18km/h
Thu. 14, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon33°/20°
Humidity Icon61%
Wind Icon17km/h
Fri. 15, Aug.
sunnySunny
Temperature Icon31°/16°
Humidity Icon54%
Wind Icon10km/h
Sat. 16, Aug.
partly cloudyPartly Cloudy
Temperature Icon32°/16°
Humidity Icon66%
Wind Icon17km/h
Sun. 17, Aug.
sunnySunny
Temperature Icon34°/17°
Humidity Icon62%
Wind Icon14km/h
Mon. 18, Aug.
partly cloudyPartly Cloudy
Temperature Icon30°/18°
Humidity Icon60%
Wind Icon15km/h
Tue. 19, Aug.
partly cloudyPartly Cloudy
Temperature Icon24°/16°
Humidity Icon63%
Wind Icon12km/h
Wed. 20, Aug.
cloudyCloudy
Temperature Icon28°/19°
Humidity Icon69%
Wind Icon19km/h
Thu. 21, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon35°/22°
Humidity Icon72%
Wind Icon24km/h
Fri. 22, Aug.
moderate rainModerate rain
Temperature Icon26°/19°
Humidity Icon94%
Wind Icon19km/h
Sat. 23, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon24°/17°
Humidity Icon90%
Wind Icon6km/h
Sun. 24, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon24°/17°
Humidity Icon85%
Wind Icon7km/h
Mon. 25, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon28°/17°
Humidity Icon74%
Wind Icon13km/h
Tue. 26, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon28°/17°
Humidity Icon71%
Wind Icon13km/h
Wed. 27, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon28°/16°
Humidity Icon74%
Wind Icon12km/h
Thu. 28, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon27°/16°
Humidity Icon78%
Wind Icon14km/h
Fri. 29, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon26°/16°
Humidity Icon75%
Wind Icon13km/h
Sat. 30, Aug.
heavy rain at timesHeavy rain at times
Temperature Icon28°/16°
Humidity Icon72%
Wind Icon14km/h
Sun. 31, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon28°/17°
Humidity Icon70%
Wind Icon13km/h
Mon. 1, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon26°/16°
Humidity Icon73%
Wind Icon13km/h
Tue. 2, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon27°/15°
Humidity Icon76%
Wind Icon12km/h
Wed. 3, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon27°/16°
Humidity Icon78%
Wind Icon11km/h
Thu. 4, Sep.
heavy rain at timesHeavy rain at times
Temperature Icon28°/16°
Humidity Icon74%
Wind Icon14km/h
Fri. 5, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon26°/17°
Humidity Icon75%
Wind Icon14km/h
Sat. 6, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon25°/16°
Humidity Icon77%
Wind Icon14km/h
Sun. 7, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon26°/15°
Humidity Icon77%
Wind Icon14km/h
Mon. 8, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon27°/15°
Humidity Icon76%
Wind Icon15km/h
Tue. 9, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon25°/15°
Humidity Icon74%
Wind Icon13km/h
Wed. 10, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon24°/15°
Humidity Icon78%
Wind Icon15km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onThu. 21, Aug.

35.3°C

Low will be onWed. 10, Sep.

14.6°C

HumidityHumidity

High will be onFri. 22, Aug.

94%

Low will be onMon. 11, Aug.

51%

Wind SpeedWind Speed

High will be onThu. 21, Aug.

24.1km/h

Low will be onSat. 23, Aug.

6.1km/h

PrecipitationPrecipitation

High will be onFri. 22, Aug.

12.3mm

Low will be onMon. 18, Aug.

0.03mm

Ultraviolet IndexUV

High will be onSun. 17, Aug.

7

Low will be onFri. 15, Aug.

0.1

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