Skip to content
VSWeather

Longmont, CO weather and climate

Boulder County, CO · population 98,958 · about 4,990 ft elevation

Everything below is a 30 year average for 1991-2020, computed from daily climate history at Longmont's own coordinates.

The year at a glance

Sunny days
262
clear or partly cloudy, per year
Precipitation
20 in
per year
Wet days
95
rain or snow per year
Snowfall
48 in
per year
Hot days
48
above 90 °F
Freezing nights
169
at or below 32 °F
Humidity
60%
average relative
Average temperature
50 °F
year round

Monthly temperatures

Average daily high and low for each month, in °F.

Daily highDaily low
255075JanMarMayJulSepNovDaily high, Jan: 44 °FDaily high, Feb: 47 °FDaily high, Mar: 57 °FDaily high, Apr: 63 °FDaily high, May: 73 °FDaily high, Jun: 84 °FDaily high, Jul: 91 °FDaily high, Aug: 88 °FDaily high, Sep: 80 °FDaily high, Oct: 66 °FDaily high, Nov: 53 °FDaily high, Dec: 45 °FDaily low, Jan: 14 °FDaily low, Feb: 17 °FDaily low, Mar: 26 °FDaily low, Apr: 32 °FDaily low, May: 41 °FDaily low, Jun: 51 °FDaily low, Jul: 55 °FDaily low, Aug: 54 °FDaily low, Sep: 46 °FDaily low, Oct: 33 °FDaily low, Nov: 24 °FDaily low, Dec: 15 °F
View monthly temperatures as a table
Monthly temperatures (°F)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Daily high444757637384918880665345
Daily low141726324151555446332415

Monthly precipitation

Total rain plus melted snow for each month, in inches.

0.01.02.03.0JanMarMayJulSepNovLongmont, Jan: 0.8 inLongmont, Feb: 0.8 inLongmont, Mar: 1.6 inLongmont, Apr: 2.6 inLongmont, May: 3.4 inLongmont, Jun: 2.1 inLongmont, Jul: 1.7 inLongmont, Aug: 1.6 inLongmont, Sep: 1.5 inLongmont, Oct: 1.6 inLongmont, Nov: 1.1 inLongmont, Dec: 0.7 in
View monthly precipitation as a table
Monthly precipitation (inches)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Longmont0.80.81.62.63.42.11.71.61.51.61.10.7

Monthly sunny days

Days each month with clear or partly cloudy skies.

01020JanMarMayJulSepNovLongmont, Jan: 22 daysLongmont, Feb: 19 daysLongmont, Mar: 21 daysLongmont, Apr: 18 daysLongmont, May: 19 daysLongmont, Jun: 23 daysLongmont, Jul: 24 daysLongmont, Aug: 24 daysLongmont, Sep: 24 daysLongmont, Oct: 23 daysLongmont, Nov: 22 daysLongmont, Dec: 23 days
View monthly sunny days as a table
Monthly sunny days (days)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Longmont221921181923242424232223

Compare Longmont with another city

Nearby cities and popular picks. Any two cities can be compared from the home page.

See weather for every covered Colorado city

About this data

Figures are 30 year averages for 1991-2020. Wet days count days with measurable precipitation, calibrated against the wet day counts in NOAA's published climate normals. Sunny days count clear plus partly cloudy days, defined as average cloud cover of 63 percent or less and calibrated against NOAA's published sky cover tables. Snowfall figures are model estimates anchored to NOAA station measurements near each city.

Weather data by Open-Meteo.com (CC BY 4.0). Contains modified Copernicus Climate Change Service information (ERA5, ERA5-Land).