December weather in Portland, TN
The average temperature in Portland in December is 39.6°F (30.2°F–48.9°F). Average precipitation: 5.11 inches.
December is a winter month in Portland, and is cooler than the annual average of 58.3°F. Daily temperatures swing about 18.7°F between overnight low and afternoon high. Expect about 11 days with precipitation. Daylight averages about 9h 31m. For travel, December is a wet month.
Avg High
48.9°F
Avg Low
30.2°F
Precipitation
5.11 in
Daylight
9h 31m
December records in Portland
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 73.0°F (2006) | 10.0°F (1964) | 2.02 in (1991) |
| December 2 | 70.0°F (1970) | 14.0°F (2020) | 1.71 in (1958) |
| December 3 | 89.1°F (1991) | 14.0°F (1966) | 2.84 in (1990) |
| December 4 | 73.9°F (1998) | 12.0°F (1969) | 2.50 in (1978) |
| December 5 | 75.9°F (1998) | 12.9°F (1969) | 1.81 in (2002) |
| December 6 | 71.1°F (2001) | 14.0°F (2024) | 1.90 in (2013) |
| December 7 | 73.9°F (1998) | 7.0°F (1977) | 2.00 in (1957) |
| December 8 | 69.1°F (1980) | 9.0°F (1977) | 2.67 in (1978) |
| December 9 | 71.1°F (1980) | 10.9°F (2006) | 4.00 in (1978) |
| December 10 | 71.1°F (1971) | 6.1°F (1995) | 2.89 in (2012) |
| December 11 | 71.1°F (1971) | 6.1°F (1995) | 1.48 in (1983) |
| December 12 | 73.0°F (2007) | -6.0°F (1962) | 1.00 in (2010) |
| December 13 | 66.9°F (1972) | -2.9°F (1962) | 2.83 in (1979) |
| December 14 | 72.0°F (2015) | 1.0°F (1962) | 1.58 in (2020) |
| December 15 | 71.1°F (1971) | 3.0°F (1963) | 0.97 in (1990) |
| December 16 | 72.0°F (1984) | -0.9°F (1989) | 1.07 in (1982) |
| December 17 | 68.0°F (1984) | 6.1°F (1963) | 3.08 in (2019) |
| December 18 | 72.0°F (1990) | 3.9°F (1964) | 2.26 in (1990) |
| December 19 | 66.9°F (1967) | -2.9°F (1963) | 2.31 in (2025) |
| December 20 | 64.9°F (1978) | 3.9°F (1963) | 1.12 in (1973) |
| December 21 | 70.0°F (1967) | 5.0°F (1963) | 2.00 in (1970) |
| December 22 | 72.0°F (2013) | -14.1°F (1989) | 2.83 in (1990) |
| December 23 | 70.0°F (1970) | -14.1°F (1989) | 2.75 in (2017) |
| December 24 | 73.9°F (1964) | -7.1°F (1983) | 3.17 in (1987) |
| December 25 | 73.0°F (1955) | -2.0°F (1983) | 1.88 in (1987) |
| December 26 | 73.0°F (2016) | 0.0°F (1983) | 1.65 in (1975) |
| December 27 | 73.0°F (2016) | -4.0°F (1983) | 1.60 in (2016) |
| December 28 | 71.1°F (2015) | 10.0°F (1977) | 1.61 in (1988) |
| December 29 | 73.0°F (2025) | 6.1°F (1961) | 2.60 in (1969) |
| December 30 | 68.0°F (1965) | -0.9°F (1983) | 2.02 in (2019) |
| December 31 | 71.1°F (1989) | 0.0°F (1976) | 1.90 in (1972) |