December weather in Decorah, IA
The average temperature in Decorah in December is 25.2°F (17.4°F–32.9°F). Average precipitation: 1.31 inches. Average snowfall is 9.1 inches.
December is a winter month in Decorah, and is cooler than the annual average of 48.5°F. Daily temperatures swing about 15.5°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 8h 48m. For travel, December is cold.
Avg High
32.9°F
Avg Low
17.4°F
Precipitation
1.31 in
Snow
9.1 in
December records in Decorah
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 63.0°F (1962) | -8.0°F (1893) | 0.91 in (1985) |
| December 2 | 63.0°F (1982) | -9.9°F (1919) | 0.56 in (1902) |
| December 3 | 64.9°F (2012) | -20.9°F (1919) | 0.95 in (1990) |
| December 4 | 62.1°F (2017) | -8.0°F (1991) | 0.50 in (2011) |
| December 5 | 64.0°F (2001) | -9.9°F (2005) | 1.36 in (1973) |
| December 6 | 62.1°F (1998) | -15.0°F (1926) | 0.50 in (1982) |
| December 7 | 57.0°F (2024) | -17.0°F (1972) | 0.77 in (1967) |
| December 8 | 55.9°F (1894) | -14.1°F (1917) | 0.20 in (1924) |
| December 9 | 57.0°F (1939) | -20.0°F (1958) | 0.72 in (2009) |
| December 10 | 55.9°F (2020) | -23.1°F (1919) | 1.20 in (1911) |
| December 11 | 55.9°F (1949) | -17.0°F (1934) | 0.95 in (1899) |
| December 12 | 59.0°F (1968) | -15.0°F (1958) | 0.77 in (1965) |
| December 13 | 54.0°F (1968) | -24.0°F (1961) | 1.50 in (2015) |
| December 14 | 55.0°F (1975) | -24.0°F (1901) | 1.52 in (2015) |
| December 15 | 69.1°F (2021) | -22.0°F (1901) | 1.50 in (1894) |
| December 16 | 68.0°F (2021) | -27.0°F (1932) | 0.74 in (1908) |
| December 17 | 55.0°F (1962) | -23.1°F (1950) | 0.50 in (1895) |
| December 18 | 53.1°F (1962) | -26.0°F (1983) | 0.24 in (2002) |
| December 19 | 52.0°F (1923) | -27.0°F (1983) | 0.65 in (1968) |
| December 20 | 50.0°F (1894) | -18.9°F (1983) | 0.74 in (1902) |
| December 21 | 55.0°F (1967) | -23.1°F (1924) | 1.02 in (2006) |
| December 22 | 50.0°F (2019) | -22.0°F (1916) | 0.75 in (1984) |
| December 23 | 51.1°F (1936) | -25.1°F (1990) | 0.70 in (2014) |
| December 24 | 54.0°F (2023) | -25.1°F (1983) | 1.30 in (1932) |
| December 25 | 55.0°F (1936) | -32.1°F (2000) | 1.00 in (2009) |
| December 26 | 54.0°F (1936) | -29.0°F (1914) | 0.60 in (1911) |
| December 27 | 54.0°F (1936) | -36.0°F (1950) | 1.18 in (2018) |
| December 28 | 57.0°F (1984) | -25.1°F (1924) | 0.98 in (2024) |
| December 29 | 52.0°F (1984) | -24.0°F (1925) | 0.86 in (2019) |
| December 30 | 53.1°F (2004) | -17.0°F (1963) | 0.85 in (1906) |
| December 31 | 55.9°F (1965) | -24.0°F (1976) | 0.62 in (2006) |