TODAY OCT17
TEMPERATURE33
HUMIDITY85
PRESSURE30.48
WIND COND.230 3.4
  • 5633
  • 5838Thu
  • 6334Fri
  • 6136Sat
  • 6739Sun
daynightWeather update from Vance Brand Airport at
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Longmont Average Temperature

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
January18°F48°F32°F1.2"
February21°F50°F34°F1.5"
March30°F62°F44°F1.6"
April36°F66°F49°F0.2"
May43°F73°F57°F2.4"
June54°F89°F71°F1.1"
July59°F92°F75°F2.1"
August56°F90°F72°F1.1"
September49°F82°F64°F0.2"
October38°F69°F52°F2.1"
November28°F58°F41°F2.6"
December17°F46°F30°F0.7"

Did you know?

  • The highest monthly average temperature in Longmont for July is 75 degrees.
  • The lowest monthly average temperature in Longmont for December is 30 degrees.
  • The most monthly precipitation in Longmont occurs in November with 2.6 inches.
  • The air quality index in Longmont is 15% better than the national average.
  • The pollution index in Longmont is 73% better than the national average.

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Longmont air quality index & pollution index

In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
IndexLongmontColoradoNational
Air quality index423850
Pollution index1,333,3802,034,6195,066,862

Longmont air quality information

MeasurementTotal
Days measured363
Days with good air quality296
Days with moderate air quality63
Days w/ poor A.Q. for sensitive groups4
Days with unhealthy air quality

Longmont air quality information

PollutantTotal
Arsenic0.000%
Benzene0.020%
Carbon Tetrachloride0.001%
Lead0.010%
Mercury0.000%

Average monthly Longmont temperature with heat index

Longmont monthly precipitation with daily maximum

Longmont monthly snow depth with daily maximum

Longmont monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Mead, CO4,1814118%
Milliken, CO6,1574118%
Johnstown, CO14,3794118%
Platteville, CO2,6284118%
Dacono, CO4,6234216%
Longmont, CO90,7194216%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Plantation, FL90,8784118%
Santa Barbara, CA90,9224412%
Germantown, MD90,494492%
Sunrise, FL91,1774118%
Redding, CA91,3203824%
Longmont, CO90,7194216%
Source: The Longmont, CO weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.