December weather in New Castle, DE
The average temperature in New Castle in December is 38.2°F (30.3°F–46.0°F). Average precipitation: 3.85 inches. Average snowfall is 2.9 inches.
December is a winter month in New Castle, and is cooler than the annual average of 55.5°F. Daily temperatures swing about 15.7°F between overnight low and afternoon high. Expect about 11 days with precipitation. Daylight averages about 9h 12m. For travel, December is cool.
Avg High
46.0°F
Avg Low
30.3°F
Precipitation
3.85 in
Snow
2.9 in
December records in New Castle
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 73.9°F (2006) | 14.0°F (1967) | 1.04 in (2015) |
| December 2 | 66.9°F (1970) | 10.9°F (1967) | 1.27 in (1991) |
| December 3 | 68.0°F (1950) | 9.0°F (1976) | 1.61 in (1967) |
| December 4 | 75.0°F (1998) | 12.0°F (1966) | 1.20 in (1983) |
| December 5 | 72.0°F (1982) | 17.1°F (1976) | 1.61 in (1973) |
| December 6 | 72.0°F (2001) | 16.0°F (1957) | 1.21 in (1962) |
| December 7 | 72.0°F (1998) | 10.0°F (2002) | 1.94 in (2011) |
| December 8 | 69.1°F (1980) | 15.1°F (1970) | 1.44 in (1972) |
| December 9 | 72.0°F (1966) | 12.9°F (1960) | 2.28 in (2009) |
| December 10 | 72.0°F (1966) | 10.0°F (1982) | 1.86 in (2023) |
| December 11 | 66.9°F (2021) | 10.0°F (1968) | 2.14 in (2008) |
| December 12 | 68.0°F (2015) | 8.1°F (1988) | 1.85 in (1983) |
| December 13 | 66.9°F (2015) | 7.0°F (1960) | 2.09 in (1996) |
| December 14 | 69.1°F (2015) | 10.0°F (1982) | 1.29 in (1996) |
| December 15 | 68.0°F (2015) | 9.0°F (1962) | 2.03 in (2022) |
| December 16 | 69.1°F (1971) | 10.0°F (1951) | 1.53 in (2018) |
| December 17 | 62.1°F (2000) | 6.1°F (1951) | 1.61 in (2000) |
| December 18 | 71.1°F (2006) | 6.1°F (1932) | 1.99 in (1977) |
| December 19 | 61.0°F (1931) | 3.9°F (1932) | 1.40 in (2009) |
| December 20 | 61.0°F (2018) | 7.0°F (1963) | 1.36 in (1951) |
| December 21 | 68.0°F (2013) | 7.0°F (1932) | 1.05 in (2012) |
| December 22 | 70.0°F (2013) | 5.0°F (1989) | 1.29 in (1969) |
| December 23 | 66.0°F (1990) | 3.9°F (1989) | 1.16 in (2015) |
| December 24 | 71.1°F (2015) | -5.1°F (1983) | 1.94 in (2020) |
| December 25 | 70.0°F (1982) | -7.1°F (1983) | 0.99 in (2002) |
| December 26 | 70.0°F (1964) | -2.0°F (1983) | 1.78 in (1969) |
| December 27 | 64.9°F (1973) | 6.1°F (1950) | 1.84 in (2023) |
| December 28 | 66.9°F (1982) | 7.0°F (1950) | 1.67 in (2018) |
| December 29 | 73.9°F (1984) | 3.9°F (1933) | 1.37 in (2013) |
| December 30 | 66.0°F (1990) | 3.0°F (1933) | 1.99 in (1948) |
| December 31 | 66.9°F (1992) | 3.0°F (1962) | 1.00 in (1975) |