As of 16:36 CDT

Summit, IL weather in December

84°

Summit, Saturday, 8 August, 16:36

Clear. Feels like 87°. High 84°, low 69°.

Pressure29.97 inHg

Wind9.6 mph W

Humidity59%

Visibility6.2 mi

Dew point68°

See detailed hourly forecast

In December, Summit, IL averages a high of 35.8° and a low of 24.2°. About 2.8 inches of precipitation fall over the month (10 wet days). The record high is 67.8° (2012) and the record low -22.7° (1983). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	39.2°	28.6°	42%	63.9° (1970)	5.9° (2025)
2	40.3°	28.8°	33%	67.3° (1982)	9.9° (1976)
3	39.6°	28.9°	35%	67.8° (2012)	7.7° (2006)
4	38.8°	28°	27%	64.2° (1998)	-0.6° (1991)
5	39.4°	27°	32%	66.2° (2001)	-0.8° (1991)
6	37.4°	25.9°	27%	61.5° (1998)	5.9° (1972)
7	35.8°	25.9°	27%	56.8° (1980)	0.7° (1972)
8	36.7°	26.6°	28%	62.4° (1991)	3.2° (2006)
9	37°	25.2°	40%	54.7° (2023)	-2.9° (1995)
10	36.1°	24.6°	28%	58.3° (1971)	-4.7° (1978)
11	35.2°	24.3°	35%	59.2° (2021)	-8.1° (1972)
12	37°	24.4°	33%	60.1° (2015)	-2.7° (2000)
13	36.9°	24.4°	25%	61.9° (2015)	-6.2° (2000)
14	36.9°	25.9°	32%	62.6° (1975)	-6.3° (1985)
15	37.9°	25.7°	32%	65.3° (2021)	-3.5° (2016)
16	36°	24.8°	37%	63.7° (2021)	-1.5° (1989)
17	33.3°	22.8°	22%	54.7° (2006)	-5.4° (1972)
18	33.3°	21.6°	22%	53.8° (2002)	-6.2° (1985)
19	34.2°	22.6°	23%	52.5° (2002)	-11.6° (2016)
20	34.2°	22.8°	33%	57.6° (1988)	-9.4° (1963)
21	34.2°	22.5°	33%	58.1° (1967)	-13.2° (1989)
22	34.5°	22.1°	32%	50° (2019)	-12.3° (1983)
23	35.1°	22.6°	37%	59.5° (2015)	-15.9° (1983)
24	33.1°	20.7°	35%	59.7° (2023)	-22.7° (1983)
25	31.8°	20.3°	27%	60.4° (1982)	-16.6° (1983)
26	33.3°	20.5°	33%	61.7° (2019)	-11.4° (1983)
27	34.7°	22.8°	30%	60.3° (2008)	-3.5° (2017)
28	36°	23.7°	37%	62.2° (1984)	-3.8° (1961)
29	34.7°	23.4°	35%	61.7° (1984)	-7.4° (1983)
30	34°	21.6°	35%	57° (2002)	-10.3° (1983)
31	33.4°	21.6°	37%	58.1° (1965)	-12.8° (1963)