December weather in Lyman, WY
The average temperature in Lyman in December is 20.9°F (10.6°F–31.3°F). Average precipitation: 0.79 inches. Average snowfall is 9.5 inches.
December is a winter month in Lyman, and is cooler than the annual average of 40.8°F. Daily temperatures swing about 20.7°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 9h 2m. For travel, December is cold.
Avg High
31.3°F
Avg Low
10.6°F
Precipitation
0.79 in
Snow
9.5 in
December records in Lyman
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 60.1°F (1995) | -8.0°F (1991) | 0.26 in (1967) |
| December 2 | 55.9°F (2021) | -2.0°F (2011) | 0.18 in (1983) |
| December 3 | 61.0°F (2021) | -8.0°F (2022) | 0.58 in (2013) |
| December 4 | 55.9°F (1998) | -14.1°F (1992) | 0.33 in (2001) |
| December 5 | 55.0°F (2021) | -15.0°F (2011) | 0.23 in (2019) |
| December 6 | 55.9°F (1981) | -15.0°F (2013) | 0.40 in (1966) |
| December 7 | 55.0°F (1981) | -20.9°F (2005) | 0.43 in (2007) |
| December 8 | 57.9°F (1981) | -18.0°F (2005) | 0.42 in (1985) |
| December 9 | 55.9°F (1975) | -6.0°F (2009) | 0.10 in (1992) |
| December 10 | 55.9°F (2020) | -27.0°F (1972) | 0.40 in (2021) |
| December 11 | 57.0°F (2017) | -25.1°F (1985) | 0.12 in (1987) |
| December 12 | 57.0°F (2017) | -24.0°F (1985) | 0.52 in (1992) |
| December 13 | 57.0°F (2017) | -20.0°F (1967) | 0.70 in (1996) |
| December 14 | 54.0°F (2025) | -11.0°F (1972) | 0.20 in (1996) |
| December 15 | 53.1°F (1977) | -18.9°F (1972) | 0.18 in (2010) |
| December 16 | 57.0°F (1980) | -11.9°F (1972) | 0.19 in (1993) |
| December 17 | 62.1°F (1980) | -9.9°F (1978) | 0.22 in (2006) |
| December 18 | 54.0°F (1980) | -8.0°F (2022) | 0.23 in (1989) |
| December 19 | 51.1°F (1980) | -13.0°F (2006) | 0.36 in (1990) |
| December 20 | 54.0°F (2025) | -20.0°F (1990) | 0.79 in (2010) |
| December 21 | 60.1°F (1969) | -41.1°F (1990) | 0.66 in (2010) |
| December 22 | 57.0°F (2025) | -31.0°F (1990) | 0.32 in (2011) |
| December 23 | 57.0°F (2025) | -13.0°F (1990) | 0.52 in (1987) |
| December 24 | 50.0°F (1980) | -17.0°F (1983) | 0.24 in (1987) |
| December 25 | 57.9°F (2025) | -24.0°F (1987) | 0.50 in (2011) |
| December 26 | 52.0°F (2025) | -18.0°F (1987) | 0.51 in (1969) |
| December 27 | 55.9°F (1980) | -9.0°F (2019) | 0.08 in (2024) |
| December 28 | 53.1°F (2005) | -11.9°F (1971) | 0.25 in (2006) |
| December 29 | 50.0°F (1996) | -15.0°F (1978) | 1.12 in (2020) |
| December 30 | 57.0°F (1980) | -27.0°F (1978) | 1.00 in (2011) |
| December 31 | 52.0°F (1980) | -31.0°F (1978) | 0.18 in (2002) |