December weather in Waterloo, IA
The average temperature in Waterloo in December is 25.3°F (17.0°F–33.7°F). Average precipitation: 1.44 inches. Average snowfall is 9.9 inches.
December is a winter month in Waterloo, and is cooler than the annual average of 49°F. Daily temperatures swing about 16.7°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 8h 54m. For travel, December is cold.
Avg High
33.7°F
Avg Low
17.0°F
Precipitation
1.44 in
Snow
9.9 in
December records in Waterloo
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 63.0°F (1998) | -5.1°F (1971) | 0.99 in (1985) |
| December 2 | 64.9°F (1973) | -16.1°F (1985) | 0.28 in (1978) |
| December 3 | 66.9°F (2012) | -17.0°F (1985) | 1.13 in (2011) |
| December 4 | 66.9°F (1998) | -15.0°F (2025) | 1.24 in (1973) |
| December 5 | 66.9°F (2001) | -16.1°F (2005) | 1.68 in (1982) |
| December 6 | 60.1°F (1951) | -14.1°F (2005) | 0.65 in (1994) |
| December 7 | 62.1°F (2024) | -18.9°F (1976) | 0.65 in (1969) |
| December 8 | 59.0°F (2024) | -15.0°F (1976) | 0.68 in (2009) |
| December 9 | 55.0°F (2020) | -11.9°F (1977) | 0.43 in (2009) |
| December 10 | 60.1°F (2020) | -20.0°F (1958) | 1.28 in (1964) |
| December 11 | 61.0°F (1965) | -18.0°F (1976) | 0.58 in (2010) |
| December 12 | 57.9°F (1968) | -15.0°F (2000) | 0.81 in (1991) |
| December 13 | 57.0°F (1975) | -26.0°F (1961) | 3.32 in (2015) |
| December 14 | 57.0°F (1975) | -18.9°F (1985) | 0.61 in (2015) |
| December 15 | 73.9°F (2021) | -17.0°F (1961) | 0.74 in (2014) |
| December 16 | 53.1°F (2006) | -17.0°F (1963) | 0.25 in (1961) |
| December 17 | 50.0°F (1959) | -14.1°F (1950) | 0.25 in (1967) |
| December 18 | 57.0°F (2002) | -23.1°F (1983) | 0.93 in (1968) |
| December 19 | 52.0°F (1979) | -25.1°F (1985) | 0.68 in (1987) |
| December 20 | 53.1°F (1967) | -20.0°F (1983) | 0.78 in (2006) |
| December 21 | 52.0°F (1967) | -27.0°F (1963) | 0.83 in (1984) |
| December 22 | 54.0°F (2019) | -23.1°F (1983) | 0.66 in (1979) |
| December 23 | 52.0°F (1965) | -25.1°F (1989) | 0.82 in (2015) |
| December 24 | 57.0°F (2023) | -27.0°F (2000) | 0.55 in (2010) |
| December 25 | 59.0°F (2019) | -29.0°F (2000) | 0.77 in (2009) |
| December 26 | 52.0°F (1959) | -25.1°F (1962) | 0.47 in (2018) |
| December 27 | 52.0°F (1959) | -26.0°F (1950) | 1.42 in (2018) |
| December 28 | 62.1°F (1984) | -17.0°F (1993) | 0.71 in (2015) |
| December 29 | 53.1°F (2019) | -11.0°F (1983) | 0.57 in (1972) |
| December 30 | 60.1°F (1965) | -18.9°F (1976) | 0.50 in (2011) |
| December 31 | 59.0°F (1965) | -23.1°F (1976) | 0.62 in (1977) |