Longmont, Colorado, United States Climate Change Severity

43
High
The current climate change severity in Longmont is High, with a -7.1% 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

Longmont 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), Longmont temperature has changed by around +6.05%, 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
5858
0%
cloudyCloudy
5251
-1.9%
rainyRainy
7647
-38.1%
snowySnowy
77
0%
mistyMisty
03
100%

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

Climate Change Indicators:

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

Temperature change of

+0.5 °C

Variation in annual rainfall

-4.9 %

Change in average humidity

+0.7 %

PM2.5 levels surged by

-24.3 %

Heatwave changed by

-6.1 day(s)

Coldwave changed by

-5.06 day(s)

Wind speeds changed by

+3.8 km/h

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

Longmont Weather Forecast 30 Days (August - September 2025)
Longmont, Colorado, United States

Condition
Temperature IconTemperature
Humidity Iconhumi.
Wind IconWind Speed
Fri. 8, Aug.
overcastOvercast
Temperature Icon36°/19°
Humidity Icon17%
Wind Icon36km/h
Sat. 9, Aug.
sunnySunny
Temperature Icon32°/16°
Humidity Icon51%
Wind Icon28km/h
Sun. 10, Aug.
moderate rainModerate rain
Temperature Icon20°/14°
Humidity Icon87%
Wind Icon23km/h
Mon. 11, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon29°/12°
Humidity Icon54%
Wind Icon22km/h
Tue. 12, Aug.
sunnySunny
Temperature Icon33°/15°
Humidity Icon48%
Wind Icon20km/h
Wed. 13, Aug.
sunnySunny
Temperature Icon36°/19°
Humidity Icon24%
Wind Icon17km/h
Thu. 14, Aug.
sunnySunny
Temperature Icon38°/18°
Humidity Icon27%
Wind Icon19km/h
Fri. 15, Aug.
sunnySunny
Temperature Icon36°/20°
Humidity Icon22%
Wind Icon28km/h
Sat. 16, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon34°/18°
Humidity Icon31%
Wind Icon13km/h
Sun. 17, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon32°/18°
Humidity Icon44%
Wind Icon18km/h
Mon. 18, Aug.
partly cloudyPartly Cloudy
Temperature Icon34°/18°
Humidity Icon31%
Wind Icon17km/h
Tue. 19, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon32°/18°
Humidity Icon38%
Wind Icon21km/h
Wed. 20, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon34°/18°
Humidity Icon43%
Wind Icon24km/h
Thu. 21, Aug.
patchy rain possiblePatchy rain possible
Temperature Icon30°/15°
Humidity Icon39%
Wind Icon16km/h
Fri. 22, Aug.
moderate rain at timesModerate rain at times
Temperature Icon30°/15°
Humidity Icon41%
Wind Icon15km/h
Sat. 23, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon30°/16°
Humidity Icon41%
Wind Icon16km/h
Sun. 24, Aug.
patchy rain possiblePatchy rain possible
Temperature Icon30°/15°
Humidity Icon40%
Wind Icon14km/h
Mon. 25, Aug.
moderate rain at timesModerate rain at times
Temperature Icon29°/15°
Humidity Icon41%
Wind Icon15km/h
Tue. 26, Aug.
moderate rain at timesModerate rain at times
Temperature Icon29°/16°
Humidity Icon43%
Wind Icon14km/h
Wed. 27, Aug.
patchy rain possiblePatchy rain possible
Temperature Icon30°/15°
Humidity Icon41%
Wind Icon15km/h
Thu. 28, Aug.
moderate rain at timesModerate rain at times
Temperature Icon29°/16°
Humidity Icon42%
Wind Icon16km/h
Fri. 29, Aug.
moderate rain at timesModerate rain at times
Temperature Icon30°/15°
Humidity Icon43%
Wind Icon14km/h
Sat. 30, Aug.
moderate rain at timesModerate rain at times
Temperature Icon30°/15°
Humidity Icon40%
Wind Icon14km/h
Sun. 31, Aug.
moderate rain at timesModerate rain at times
Temperature Icon29°/15°
Humidity Icon39%
Wind Icon15km/h
Mon. 1, Sep.
patchy rain possiblePatchy rain possible
Temperature Icon30°/14°
Humidity Icon39%
Wind Icon16km/h
Tue. 2, Sep.
patchy rain possiblePatchy rain possible
Temperature Icon30°/16°
Humidity Icon35%
Wind Icon13km/h
Wed. 3, Sep.
moderate rain at timesModerate rain at times
Temperature Icon29°/15°
Humidity Icon38%
Wind Icon15km/h
Thu. 4, Sep.
patchy rain possiblePatchy rain possible
Temperature Icon29°/14°
Humidity Icon39%
Wind Icon16km/h
Fri. 5, Sep.
moderate rain at timesModerate rain at times
Temperature Icon28°/14°
Humidity Icon39%
Wind Icon16km/h
Sat. 6, Sep.
moderate rain at timesModerate rain at times
Temperature Icon28°/14°
Humidity Icon41%
Wind Icon17km/h
Sun. 7, Sep.
heavy rain at timesHeavy rain at times
Temperature Icon27°/13°
Humidity Icon41%
Wind Icon16km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onThu. 14, Aug.

38.1°C

Low will be onMon. 11, Aug.

11.7°C

HumidityHumidity

High will be onSun. 10, Aug.

87%

Low will be onFri. 8, Aug.

17%

Wind SpeedWind Speed

High will be onFri. 8, Aug.

36.4km/h

Low will be onSat. 16, Aug.

13.3km/h

PrecipitationPrecipitation

High will be onSun. 10, Aug.

6.9mm

Low will be onWed. 13, Aug.

0.03mm

Ultraviolet IndexUV

High will be onWed. 13, Aug.

7

Low will be onSun. 17, Aug.

5

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