December weather in Hartly, DE
The average temperature in Hartly in December is 40.3°F (32.1°F–48.6°F). Average precipitation: 3.99 inches. Average snowfall is 2.6 inches.
December is a winter month in Hartly, and is cooler than the annual average of 57.1°F. Daily temperatures swing about 16.5°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 9h 15m. For travel, December is cool.
Avg High
48.6°F
Avg Low
32.1°F
Precipitation
3.99 in
Snow
2.6 in
December records in Hartly
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 72.0°F (2006) | 12.0°F (1929) | 1.21 in (1920) |
| December 2 | 72.0°F (2006) | 12.0°F (1967) | 0.85 in (1927) |
| December 3 | 71.1°F (1991) | 10.9°F (1976) | 1.32 in (1967) |
| December 4 | 72.0°F (1982) | 12.9°F (1966) | 1.49 in (1948) |
| December 5 | 73.9°F (1982) | 16.0°F (1935) | 1.65 in (1993) |
| December 6 | 73.9°F (2001) | 17.1°F (1893) | 2.16 in (1945) |
| December 7 | 75.0°F (1998) | 12.9°F (1926) | 2.76 in (1971) |
| December 8 | 75.0°F (1998) | 16.0°F (1910) | 0.88 in (1969) |
| December 9 | 73.0°F (1966) | 12.0°F (1910) | 2.76 in (2009) |
| December 10 | 75.0°F (1966) | -0.9°F (1910) | 1.15 in (1919) |
| December 11 | 70.0°F (1911) | 10.0°F (1968) | 1.48 in (1992) |
| December 12 | 72.0°F (2015) | 8.1°F (1988) | 1.92 in (1967) |
| December 13 | 72.0°F (2015) | 9.0°F (1960) | 2.00 in (1909) |
| December 14 | 72.0°F (2015) | 8.1°F (1960) | 2.90 in (1996) |
| December 15 | 68.0°F (2015) | 10.0°F (1962) | 1.35 in (1981) |
| December 16 | 70.0°F (1971) | 10.0°F (1910) | 1.93 in (2018) |
| December 17 | 66.9°F (1971) | 3.9°F (1910) | 2.15 in (2000) |
| December 18 | 71.1°F (1984) | 5.0°F (1919) | 3.84 in (2023) |
| December 19 | 71.1°F (2006) | 5.0°F (1926) | 1.27 in (2025) |
| December 20 | 64.9°F (1895) | 1.9°F (1942) | 1.53 in (1933) |
| December 21 | 75.0°F (1987) | -2.9°F (1942) | 2.32 in (1951) |
| December 22 | 70.0°F (2013) | 3.9°F (1942) | 1.62 in (1972) |
| December 23 | 66.9°F (1990) | 1.9°F (1989) | 1.80 in (1907) |
| December 24 | 72.0°F (2015) | 6.1°F (1908) | 1.64 in (2003) |
| December 25 | 72.0°F (2015) | 1.0°F (1983) | 2.40 in (1909) |
| December 26 | 73.9°F (1964) | 3.9°F (1983) | 2.94 in (1969) |
| December 27 | 69.1°F (1951) | 10.0°F (1948) | 1.95 in (1894) |
| December 28 | 70.0°F (1946) | 6.1°F (1909) | 1.90 in (1926) |
| December 29 | 75.0°F (1984) | 7.0°F (1933) | 1.20 in (2013) |
| December 30 | 69.1°F (1990) | 3.0°F (1909) | 1.68 in (1948) |
| December 31 | 66.9°F (1971) | 3.9°F (1962) | 0.92 in (1969) |