As of 15:29 MDT

Boulder, CO weather in December

95°

Boulder, Saturday, 8 August, 15:29

Overcast. Feels like 91°. High 96°, low 66°.

Pressure29.71 inHg

Wind7 mph SW

Humidity16%

Visibility6.2 mi

Dew point40°

See detailed hourly forecast

In December, Boulder, CO averages a high of 39.5° and a low of 16.3°. About 1.1 inches of precipitation fall over the month (6 wet days). The record high is 71.2° (2025) and the record low -22.7° (1990). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	42.4°	18.9°	13%	69.3° (2021)	1.4° (2004)
2	43.2°	19.6°	13%	65.1° (2021)	-4.5° (2004)
3	42.3°	19.2°	17%	62.6° (2017)	-6.7° (2006)
4	43.3°	18.3°	12%	62.8° (2021)	-10.1° (2009)
5	42.1°	18.1°	22%	64.6° (2012)	-20° (2013)
6	39.6°	17.8°	23%	57.2° (2023)	-20.4° (1972)
7	40.3°	18.5°	23%	59° (1965)	-12.5° (2013)
8	39.9°	17.6°	25%	58.8° (1981)	-20.4° (1978)
9	39.9°	16.3°	22%	59.7° (1981)	-13.9° (1978)
10	41°	16.7°	15%	61.3° (1990)	-16.8° (1972)
11	41.4°	18°	17%	62.8° (2025)	-11.6° (1972)
12	41°	17.6°	12%	62.4° (2017)	-20° (1961)
13	40.1°	17.6°	18%	60.1° (2025)	-11.7° (1961)
14	39.6°	17.4°	20%	61.5° (2021)	-4.7° (1972)
15	39.7°	16.2°	20%	61.5° (2025)	-16.4° (2008)
16	39.4°	16.7°	15%	62.8° (2025)	-4° (1965)
17	40.1°	17.1°	15%	64° (1980)	-6.9° (2016)
18	38.8°	15.6°	22%	55.6° (1994)	-18.2° (2016)
19	39.2°	16.2°	22%	66.7° (2025)	-8.7° (1996)
20	39.6°	15.6°	13%	60.1° (2025)	-6.7° (1990)
21	39°	15.8°	28%	59.4° (2025)	-18° (1990)
22	37.4°	14.4°	27%	71.2° (2025)	-20.2° (1998)
23	36.5°	14.2°	22%	61.3° (1964)	-22.7° (1990)
24	36.7°	12.4°	22%	66.7° (2025)	-18° (1998)
25	37.8°	14.2°	20%	68.5° (2025)	-9.9° (1962)
26	38.5°	14.2°	17%	63.7° (2025)	-15.9° (1962)
27	38.3°	15.6°	17%	64.2° (1980)	-9° (2015)
28	37.8°	15.3°	23%	56.8° (1999)	-10.1° (2015)
29	37.2°	13.6°	13%	56.1° (2024)	-9.6° (1983)
30	37°	13.8°	20%	58.6° (1980)	-10.8° (1990)
31	35.1°	12.6°	23%	59.5° (2025)	-17.5° (2014)