Average December Temperature in Idaho Falls by Year

This page contains a list of the average monthly high and low temperatures in Idaho Falls, Idaho for the month of December each year between 1948 and 2023. It is based on NOAA data.

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What Was the Hottest December Ever in Idaho Falls?

1958 was the warmest December in the history of Idaho Falls, Idaho. The average daily high temperature was 38.1 °F, and the average low was 21.8 °F.

What Was the Coldest December Ever in Idaho Falls?

1985 was the coolest December in the history of Idaho Falls, Idaho. The average daily high temperature was 18.5 °F, and the average low was 1.4 °F.

* click column headers to sort

Year	Rank	High (°F)	Low (°F)
2023	3	36.7	20.7
2022	56	27.7	9.9
2021	4	36.2	21.0
2020	38	31.5	11.4
2019	34	29.1	14.8
2018	48	27.9	11.4
2017	44	29.2	12.2
2016	63	24.6	6.2
2015	45	28.5	12.6
2014	5	36.8	20.3
2012	11	34.6	20.5
2011	31	33.7	10.8
2010	19	31.9	17.7
2009	54	27.0	10.7
2008	41	31.0	11.5
2007	37	29.2	14.2
2006	26	33.4	13.7
2005	46	27.5	13.2
2004	16	33.8	18.1
2003	7	36.2	20.4
2002	9	35.8	20.0
2001	65	23.3	6.0
2000	47	29.1	11.1
1999	49	28.6	10.4
1998	50	27.7	11.2
1993	30	32.0	14.5
1992	59	26.3	9.0
1991	22	34.2	13.5
1990	69	22.6	2.1
1989	52	29.5	9.1
1988	61	26.1	8.9
1987	25	33.7	13.5
1986	23	35.1	12.5
1985	71	18.5	1.4
1984	64	23.6	6.5
1983	62	22.4	9.1
1982	51	26.2	12.5
1981	15	33.1	19.7
1980	2	37.5	20.1
1979	20	33.9	14.6
1978	70	21.4	1.2
1977	13	33.9	20.0
1976	28	35.7	11.2
1975	14	34.1	19.7
1974	53	27.2	10.6
1973	21	31.2	17.1
1972	67	22.6	5.2
1971	60	26.2	9.1
1970	40	28.9	13.7
1969	17	33.2	18.3
1968	33	29.5	14.9
1967	66	23.4	5.8
1966	39	29.5	13.2
1965	27	33.2	13.7
1964	18	31.8	18.0
1963	68	21.9	4.3
1962	12	35.2	18.7
1961	42	28.3	13.7
1960	43	31.4	10.5
1959	24	36.1	11.5
1958	1	38.1	21.8
1957	10	36.3	19.1
1956	29	32.2	14.5
1955	8	36.0	20.0
1954	55	29.3	8.3
1953	36	30.9	12.6
1952	35	29.7	13.8
1951	57	26.7	10.7
1950	6	35.7	21.1
1949	32	32.2	12.3
1948	58	26.5	9.2

Weather Station Details

Years	Station	Coordinates
1948–2024	Idaho Falls Fanning Field	location