As of 03:38 MDT

Longmont, CO weather in December

70°

Longmont, Sunday, 9 August, 03:38

Partly cloudy. Feels like 68°. High 97°, low 69°.

Pressure29.85 inHg

Wind1 mph SW

Humidity37%

Visibility6.2 mi

Dew point42°

See detailed hourly forecast

In December, Longmont, CO averages a high of 39.4° and a low of 18°. About 0.9 inches of precipitation fall over the month (5 wet days). The record high is 70.2° (2025) and the record low -23.6° (1990). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	42.1°	20.3°	10%	69.8° (2021)	-1.5° (1985)
2	43°	21.4°	12%	63.1° (2021)	-2.9° (1985)
3	41.7°	21°	15%	62.2° (2017)	-1.3° (1978)
4	43°	20.7°	10%	60.8° (1998)	-0.2° (2009)
5	42.1°	19.8°	15%	65.3° (2012)	-12.5° (2013)
6	39.4°	19.6°	18%	55.6° (2003)	-16.4° (1972)
7	39.9°	20.1°	17%	59° (1987)	-4.2° (1972)
8	39.9°	19.4°	23%	58.5° (1981)	-14.3° (1978)
9	40.5°	18.1°	17%	59° (2015)	-8.3° (1978)
10	40.8°	18.9°	13%	61° (1990)	-12.3° (1972)
11	41.4°	19.9°	18%	64° (2025)	-12.3° (1972)
12	40.6°	19.6°	12%	61.7° (2017)	-17° (1961)
13	40.3°	19.4°	15%	59.5° (2010)	-10.5° (1961)
14	39.9°	18.9°	17%	56.7° (2010)	-4° (1972)
15	39.6°	18.3°	13%	59.4° (1962)	-7.4° (2008)
16	39.4°	18.3°	12%	61.9° (2025)	2.3° (1965)
17	40.1°	18.5°	10%	63.9° (1980)	-7.4° (1964)
18	38.5°	17.8°	18%	55.9° (2013)	-13.5° (2016)
19	39.2°	17.8°	18%	65.3° (2025)	-2.2° (2016)
20	39.4°	17.6°	12%	59° (2025)	-7.8° (1990)
21	39°	17.2°	22%	56.7° (2025)	-19.1° (1990)
22	37°	15.8°	22%	70.2° (2025)	-23.6° (1990)
23	36.7°	15.8°	17%	62.4° (1964)	-21.8° (1990)
24	36.9°	14.5°	22%	65.5° (2025)	-18.8° (1998)
25	38.1°	15.6°	22%	67.1° (2025)	-12.3° (1983)
26	38.1°	15.8°	8%	58.6° (1980)	-6.5° (1990)
27	38.1°	16.9°	15%	63.5° (1980)	-6.9° (2015)
28	37.9°	16.7°	18%	56.8° (1999)	-6.5° (2015)
29	36.5°	14.5°	13%	54.5° (2002)	-11.4° (1983)
30	36.7°	14.7°	18%	60.3° (1980)	-11° (2017)
31	34.9°	13.8°	20%	56.1° (1996)	-18.4° (2014)