December weather in Newcastle, WY
The average temperature in Newcastle in December is 24.8°F (15.0°F–34.6°F). Average precipitation: 0.54 inches. Average snowfall is 6.8 inches.
December is a winter month in Newcastle, and is cooler than the annual average of 47.3°F. Daily temperatures swing about 19.6°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 8h 44m. For travel, December is cold.
Avg High
34.6°F
Avg Low
15.0°F
Precipitation
0.54 in
Snow
6.8 in
December records in Newcastle
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 61.0°F (1951) | -18.9°F (1985) | 0.69 in (1980) |
| December 2 | 64.9°F (1995) | -24.0°F (1985) | 0.36 in (1964) |
| December 3 | 64.0°F (2021) | -5.1°F (1909) | 0.47 in (2018) |
| December 4 | 63.0°F (1907) | -5.1°F (1909) | 0.59 in (1983) |
| December 5 | 68.0°F (1939) | -24.0°F (1972) | 0.50 in (1908) |
| December 6 | 66.0°F (1939) | -22.0°F (1972) | 0.30 in (1963) |
| December 7 | 59.0°F (1918) | -20.0°F (1927) | 0.30 in (1924) |
| December 8 | 61.0°F (1939) | -24.0°F (1972) | 0.30 in (2007) |
| December 9 | 62.1°F (1939) | -25.1°F (1919) | 0.26 in (1989) |
| December 10 | 63.0°F (1990) | -17.0°F (1932) | 0.57 in (2021) |
| December 11 | 66.0°F (1939) | -17.0°F (1932) | 0.22 in (1967) |
| December 12 | 60.1°F (1921) | -23.1°F (1919) | 0.57 in (1937) |
| December 13 | 64.0°F (2014) | -20.0°F (1919) | 0.95 in (1992) |
| December 14 | 60.1°F (1929) | -18.0°F (1926) | 0.38 in (1990) |
| December 15 | 61.0°F (1998) | -18.9°F (1945) | 0.31 in (2005) |
| December 16 | 59.0°F (1962) | -18.0°F (1979) | 0.40 in (1981) |
| December 17 | 59.0°F (1980) | -29.9°F (1964) | 0.70 in (1908) |
| December 18 | 63.0°F (1931) | -27.0°F (1964) | 0.70 in (1973) |
| December 19 | 55.0°F (1931) | -20.0°F (1924) | 0.26 in (1985) |
| December 20 | 60.1°F (1941) | -22.0°F (1990) | 0.32 in (2013) |
| December 21 | 60.1°F (1933) | -35.0°F (1983) | 0.25 in (1920) |
| December 22 | 61.0°F (1933) | -31.0°F (1983) | 0.34 in (1996) |
| December 23 | 62.1°F (2025) | -29.9°F (1983) | 0.23 in (1939) |
| December 24 | 57.9°F (1936) | -34.1°F (1983) | 0.53 in (1964) |
| December 25 | 63.0°F (2025) | -22.0°F (1983) | 0.20 in (1968) |
| December 26 | 60.1°F (2025) | -18.0°F (1996) | 0.90 in (2018) |
| December 27 | 57.9°F (1980) | -9.9°F (1920) | 0.49 in (1955) |
| December 28 | 55.0°F (1936) | -15.0°F (1946) | 0.32 in (2003) |
| December 29 | 61.0°F (1933) | -27.9°F (1990) | 0.32 in (2020) |
| December 30 | 55.0°F (1965) | -27.9°F (1990) | 0.25 in (1923) |
| December 31 | 55.9°F (1926) | -24.0°F (1923) | 0.80 in (1970) |