Longmont, Colorado, United States Climate Change Severity

48
High
The current climate change severity in Longmont is High, with a 5.8% 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)

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 +4.5%, 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
9386
-7.5%
cloudyCloudy
7670
-7.8%
rainyRainy
10250
-50.9%
snowySnowy
87
-12.5%
mistyMisty
08
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 48 (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

48/100

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

-10.4 %

Change in average humidity

+4.7 %

PM2.5 levels surged by

-30.6 %

Heatwave changed by

-3.1 day(s)

Coldwave changed by

-6.8 day(s)

Wind speeds changed by

+4.6 km/h

These indicators show that Longmont 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.

Longmont Weather Forecast 30 Days (November - December 2025)
Longmont, Colorado, United States

Condition
Temperature IconTemperature
Humidity Iconhumi.
Wind IconWind Speed
Mon. 3, Nov.
overcastOvercast
Temperature Icon13°/1°
Humidity Icon52%
Wind Icon12km/h
Tue. 4, Nov.
partly cloudyPartly Cloudy
Temperature Icon20°/3°
Humidity Icon39%
Wind Icon20km/h
Wed. 5, Nov.
partly cloudyPartly Cloudy
Temperature Icon21°/7°
Humidity Icon30%
Wind Icon12km/h
Thu. 6, Nov.
sunnySunny
Temperature Icon19°/5°
Humidity Icon29%
Wind Icon32km/h
Fri. 7, Nov.
sunnySunny
Temperature Icon13°/2°
Humidity Icon44%
Wind Icon10km/h
Sat. 8, Nov.
sunnySunny
Temperature Icon14°/2°
Humidity Icon38%
Wind Icon23km/h
Sun. 9, Nov.
sunnySunny
Temperature Icon9°/-3°
Humidity Icon56%
Wind Icon10km/h
Mon. 10, Nov.
sunnySunny
Temperature Icon19°/2°
Humidity Icon37%
Wind Icon10km/h
Tue. 11, Nov.
sunnySunny
Temperature Icon20°/7°
Humidity Icon34%
Wind Icon21km/h
Wed. 12, Nov.
partly cloudyPartly Cloudy
Temperature Icon17°/3°
Humidity Icon46%
Wind Icon8km/h
Thu. 13, Nov.
sunnySunny
Temperature Icon20°/9°
Humidity Icon30%
Wind Icon16km/h
Fri. 14, Nov.
sunnySunny
Temperature Icon18°/7°
Humidity Icon39%
Wind Icon42km/h
Sat. 15, Nov.
sunnySunny
Temperature Icon8°/1°
Humidity Icon30%
Wind Icon30km/h
Sun. 16, Nov.
sunnySunny
Temperature Icon11°/0°
Humidity Icon33%
Wind Icon11km/h
Mon. 17, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon9°/-3°
Humidity Icon60%
Wind Icon16km/h
Tue. 18, Nov.
patchy rain possiblePatchy rain possible
Temperature Icon10°/-3°
Humidity Icon54%
Wind Icon15km/h
Wed. 19, Nov.
patchy rain possiblePatchy rain possible
Temperature Icon10°/-3°
Humidity Icon51%
Wind Icon13km/h
Thu. 20, Nov.
patchy rain possiblePatchy rain possible
Temperature Icon10°/-3°
Humidity Icon51%
Wind Icon14km/h
Fri. 21, Nov.
moderate rain at timesModerate rain at times
Temperature Icon9°/-3°
Humidity Icon54%
Wind Icon13km/h
Sun. 23, Nov.
patchy rain possiblePatchy rain possible
Temperature Icon10°/-3°
Humidity Icon49%
Wind Icon14km/h
Mon. 24, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon8°/-3°
Humidity Icon48%
Wind Icon17km/h
Tue. 25, Nov.
moderate snowModerate snow
Temperature Icon7°/-5°
Humidity Icon51%
Wind Icon15km/h
Wed. 26, Nov.
moderate or heavy snow showersModerate or heavy snow showers
Temperature Icon7°/-5°
Humidity Icon57%
Wind Icon15km/h
Thu. 27, Nov.
patchy rain possiblePatchy rain possible
Temperature Icon9°/-4°
Humidity Icon48%
Wind Icon14km/h
Fri. 28, Nov.
light freezing rainLight freezing rain
Temperature Icon8°/-4°
Humidity Icon52%
Wind Icon14km/h
Sat. 29, Nov.
patchy moderate snowPatchy moderate snow
Temperature Icon7°/-4°
Humidity Icon56%
Wind Icon14km/h
Sun. 30, Nov.
light freezing rainLight freezing rain
Temperature Icon6°/-5°
Humidity Icon53%
Wind Icon13km/h
Mon. 1, Dec.
patchy moderate snowPatchy moderate snow
Temperature Icon7°/-5°
Humidity Icon56%
Wind Icon15km/h
Tue. 2, Dec.
light freezing rainLight freezing rain
Temperature Icon7°/-4°
Humidity Icon56%
Wind Icon14km/h
Wed. 3, Dec.
patchy moderate snowPatchy moderate snow
Temperature Icon6°/-5°
Humidity Icon60%
Wind Icon14km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onWed. 5, Nov.

21°C

Low will be onSun. 30, Nov.

-5.4°C

HumidityHumidity

High will be onMon. 17, Nov.

60%

Low will be onThu. 6, Nov.

29%

Wind SpeedWind Speed

High will be onFri. 14, Nov.

42.1km/h

Low will be onWed. 12, Nov.

7.9km/h

PrecipitationPrecipitation

High will be onMon. 24, Nov.

2.2mm

Low will be onSun. 16, Nov.

0.01mm

Ultraviolet IndexUV

High will be onThu. 6, Nov.

4

Low will be onMon. 17, Nov.

1

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