Longmont, CO Weather - Forecast & Monthly Averages

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Weather Quick Facts

The highest monthly average temperature in Longmont for July is 74.7 degrees
The lowest monthly average temperature in Longmont for December is 29.7 degrees
The most monthly precipitation in Longmont occurs in November with 2.6 inches
The air quality index in Longmont is 12% worse than the national average
The pollution index in Longmont is 51% better than the national average

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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.
Month	Temp. _(min)	Temp. _(max)	Temp. _(avg)	Precipitation
January	18°F	48°F	32°F	1.2"
February	21°F	50°F	34°F	1.5"
March	30°F	62°F	44°F	1.6"
April	36°F	66°F	49°F	0.2"
May	43°F	73°F	57°F	2.4"
June	54°F	89°F	71°F	1.1"
July	59°F	92°F	75°F	2.1"
August	56°F	90°F	72°F	1.1"
September	49°F	82°F	64°F	0.2"
October	38°F	69°F	52°F	2.1"
November	28°F	58°F	41°F	2.6"
December	17°F	46°F	30°F	0.7"

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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.
Index	Longmont	Colorado	National
Air quality index	47	38	42
Pollution index	1,333,380	2,068,342	2,726,193

Longmont air quality information

Measurement	Total
Days measured	365
Days with good air quality	227
Days with moderate air quality	133
Days w/ poor A.Q. for sensitive groups	5
Days with unhealthy air quality	0

Longmont air quality information

Pollutant	Total
Arsenic	0.000%
Benzene	0.020%
Carbon Tetrachloride	0.001%
Lead	0.010%
Mercury	0.000%

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	Population	Air Quality Index	National Avg.
Mead, CO	4,978	45	10.0%
Milliken, CO	7,862	45	10.0%
Johnstown, CO	14,357	45	10.0%
Platteville, CO	3,017	45	10.0%
Louisville, CO	19,342	47	6.0%
Longmont, CO	95,864	47	6.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Riverview, FL	95,849	43	14.0%
Compton, CA	95,804	72	44.0%
Brockton, MA	95,740	43	14.0%
Flint, MI	95,999	38	24.0%
Brossard, QC	96,033	n/a
Longmont, CO	95,864	47	6.0%

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.