December weather in Riverton, WY
The average temperature in Riverton in December is 17.6°F (5.7°F–29.6°F). Average precipitation: 0.31 inches. Average snowfall is 5.3 inches.
December is a winter month in Riverton, and is cooler than the annual average of 43.9°F. Daily temperatures swing about 23.9°F between overnight low and afternoon high. Expect about 4 days with precipitation. Daylight averages about 8h 50m. For travel, December is cold.
Avg High
29.6°F
Avg Low
5.7°F
Precipitation
0.31 in
Snow
5.3 in
December records in Riverton
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 60.1°F (1951) | -22.0°F (1985) | 0.18 in (1934) |
| December 2 | 64.9°F (1995) | -24.0°F (1909) | 0.69 in (1982) |
| December 3 | 63.0°F (2021) | -29.9°F (1909) | 0.21 in (1924) |
| December 4 | 57.0°F (1958) | -25.1°F (1909) | 0.19 in (1972) |
| December 5 | 61.0°F (1940) | -34.1°F (1972) | 0.30 in (1978) |
| December 6 | 63.0°F (1939) | -41.1°F (1972) | 0.17 in (1956) |
| December 7 | 63.0°F (1981) | -41.1°F (1972) | 0.15 in (1924) |
| December 8 | 57.0°F (1981) | -38.0°F (1978) | 0.34 in (2007) |
| December 9 | 63.0°F (1939) | -40.0°F (1919) | 0.45 in (1985) |
| December 10 | 64.9°F (1933) | -36.9°F (1972) | 0.23 in (1985) |
| December 11 | 60.1°F (1933) | -36.9°F (1972) | 0.09 in (1907) |
| December 12 | 61.0°F (1995) | -35.0°F (1932) | 0.30 in (1958) |
| December 13 | 60.1°F (1924) | -32.1°F (1932) | 0.50 in (2022) |
| December 14 | 59.0°F (1924) | -31.0°F (1926) | 0.21 in (1975) |
| December 15 | 60.1°F (1924) | -29.9°F (1926) | 0.18 in (1918) |
| December 16 | 59.0°F (1939) | -29.0°F (1972) | 0.19 in (1908) |
| December 17 | 62.1°F (1939) | -31.0°F (1964) | 0.41 in (1968) |
| December 18 | 64.0°F (1980) | -41.1°F (1924) | 0.20 in (1911) |
| December 19 | 57.9°F (2013) | -45.0°F (1924) | 0.28 in (1925) |
| December 20 | 55.0°F (2025) | -44.0°F (1924) | 0.21 in (1968) |
| December 21 | 57.0°F (1981) | -40.0°F (1990) | 0.25 in (2017) |
| December 22 | 57.9°F (1933) | -44.0°F (1983) | 0.31 in (2022) |
| December 23 | 61.0°F (2025) | -45.9°F (1983) | 0.30 in (1948) |
| December 24 | 60.1°F (1969) | -43.1°F (1983) | 0.12 in (1955) |
| December 25 | 64.9°F (2025) | -33.0°F (1944) | 0.19 in (1943) |
| December 26 | 57.0°F (1980) | -29.9°F (1944) | 0.55 in (2016) |
| December 27 | 59.0°F (1980) | -29.0°F (1948) | 0.19 in (2012) |
| December 28 | 53.1°F (1980) | -26.0°F (1944) | 0.12 in (1935) |
| December 29 | 54.0°F (1965) | -32.1°F (1983) | 0.17 in (1972) |
| December 30 | 55.0°F (1929) | -42.0°F (1978) | 0.23 in (2005) |
| December 31 | 59.0°F (1980) | -45.9°F (1978) | 0.36 in (1972) |