December weather in Portsmouth, OH
The average temperature in Portsmouth in December is 36.7°F (27.6°F–45.7°F). Average precipitation: 3.50 inches.
December is a winter month in Portsmouth, and is cooler than the annual average of 54.9°F. Daily temperatures swing about 18.1°F between overnight low and afternoon high. Expect about 12 days with precipitation. Daylight averages about 9h 18m. For travel, December is cool.
Avg High
45.7°F
Avg Low
27.6°F
Precipitation
3.50 in
Daylight
9h 18m
December records in Portsmouth
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 75.0°F (1998) | 12.0°F (1924) | 1.50 in (1974) |
| December 2 | 72.0°F (1970) | 10.0°F (1924) | 1.84 in (1986) |
| December 3 | 73.9°F (1982) | 8.1°F (1903) | 2.50 in (1991) |
| December 4 | 75.0°F (1982) | 9.0°F (1985) | 1.57 in (1978) |
| December 5 | 72.0°F (1916) | 12.9°F (1907) | 1.49 in (1977) |
| December 6 | 73.9°F (2001) | 12.0°F (1904) | 2.38 in (2013) |
| December 7 | 75.0°F (1998) | 3.0°F (1977) | 2.53 in (1919) |
| December 8 | 72.0°F (2004) | 8.1°F (1984) | 1.36 in (1978) |
| December 9 | 73.0°F (1966) | 3.9°F (1917) | 2.50 in (1978) |
| December 10 | 70.0°F (1952) | -5.1°F (1917) | 1.10 in (2012) |
| December 11 | 75.9°F (1971) | -15.0°F (1917) | 0.71 in (1967) |
| December 12 | 70.0°F (1979) | -2.0°F (1962) | 1.07 in (1996) |
| December 13 | 73.0°F (1927) | -5.1°F (1962) | 2.18 in (1949) |
| December 14 | 70.0°F (1927) | -5.1°F (1904) | 1.50 in (1999) |
| December 15 | 70.0°F (1971) | -4.0°F (2025) | 2.30 in (1948) |
| December 16 | 72.0°F (1971) | -4.0°F (1989) | 1.66 in (1902) |
| December 17 | 68.0°F (1924) | -8.0°F (1989) | 2.50 in (2000) |
| December 18 | 73.0°F (1924) | -8.0°F (1989) | 1.50 in (1990) |
| December 19 | 69.1°F (1967) | -4.0°F (1985) | 1.24 in (1995) |
| December 20 | 70.0°F (1895) | -2.0°F (1985) | 0.93 in (1933) |
| December 21 | 70.0°F (1949) | -2.9°F (1942) | 1.60 in (1978) |
| December 22 | 71.1°F (1967) | -17.0°F (1989) | 1.31 in (1970) |
| December 23 | 64.9°F (1932) | -18.0°F (1989) | 1.33 in (1990) |
| December 24 | 72.0°F (1893) | -15.0°F (1989) | 3.30 in (1921) |
| December 25 | 71.1°F (1938) | -9.0°F (1983) | 0.82 in (2008) |
| December 26 | 71.1°F (1982) | -4.0°F (1985) | 1.57 in (1987) |
| December 27 | 72.0°F (2016) | 0.0°F (1925) | 1.08 in (1916) |
| December 28 | 71.1°F (2008) | 0.0°F (1925) | 1.30 in (1940) |
| December 29 | 72.0°F (2025) | -2.9°F (1917) | 1.96 in (1942) |
| December 30 | 72.0°F (1984) | -15.0°F (1917) | 1.28 in (2019) |
| December 31 | 71.1°F (1951) | -8.0°F (1917) | 1.65 in (1944) |