Average December Temperatures for Wyoming

Average temperatures for December at cities, towns, parks and lakes throughout Wyoming are listed below in degrees Fahrenheit and Celsius.

You can jump to a separate table for each region of the state: Northwest, Southwest, North - Central, Northeast and Southeast Wyoming.

The tables give the normals for maximum and minimum temperatures based on weather data collected from 1991 to 2020 by the US National Centers for Environmental Information.

Northwest Wyoming

Average December temperatures
High °F	Low °F	Place	High °C	Low °C
28	12	Alta	-2	-11
37	18	Cody	3	-8
26	7	Jackson	-3	-14
28	4	Moose	-2	-15
24	4	Moran	-4	-16
24	7	Yellowstone Lake	-5	-14
30	12	Yellowstone Park, Mammoth	-1	-11
27	1	Yellowstone Park, Old Faithful	-3	-17
25	2	Yellowstone Park, South Entrance	-4	-17

Southwest Wyoming

Average daily temperatures in December
High °F	Low °F	Place	High °C	Low °C
33	11	Evanston	0	-12
29	0	Fontenelle Reservoir Dam	-2	-18
29	5	Fossil Butte Monument	-2	-15
31	3	Kemmerer	0	-16
30	13	Rock Springs	-1	-10

North - Central Wyoming

December temperatures: daily averages
High °F	Low °F	Place	High °C	Low °C
31	9	Boysen Reservoir Dam	0	-13
29	8	Burgess Junction	-2	-13
33	10	Lander	0	-12
30	6	Riverton	-1	-15
28	3	South Pass City	-2	-16
35	3	Ten Sleep	2	-16
38	12	Thermopolis	3	-11
32	5	Worland	0	-15

Northeast Wyoming

Average December temperatures
High °F	Low °F	Place	High °C	Low °C
36	11	Buffalo	2	-12
35	9	Devils Tower	2	-13
36	16	Gillette	2	-9
37	12	Sheridan	3	-11
33	14	Sundance	0	-10

Southeast Wyoming

Average December temperatures
High °F	Low °F	Place	High °C	Low °C
35	15	Casper	2	-10
34	13	Centennial	1	-11
39	18	Cheyenne	4	-8
39	13	Douglas	4	-11
34	14	Laramie	1	-10
33	14	Muddy Gap	1	-10
31	13	Rawlins	0	-11
42	12	Torrington	5	-11

Average Temperatures for Wyoming in December

Northwest Wyoming

Southwest Wyoming

North - Central Wyoming

Northeast Wyoming

Southeast Wyoming

Reference

More Wyoming Weather Information