December weather in Monmouth, IL
The average temperature in Monmouth in December is 28.6°F (20.8°F–36.5°F). Average precipitation: 2.15 inches. Average snowfall is 4.8 inches.
December is a winter month in Monmouth, and is cooler than the annual average of 50.6°F. Daily temperatures swing about 15.7°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 9h 4m. For travel, December is cold.
Avg High
36.5°F
Avg Low
20.8°F
Precipitation
2.15 in
Snow
4.8 in
December records in Monmouth
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 63.0°F (1962) | 3.0°F (1896) | 1.46 in (1985) |
| December 2 | 68.0°F (1951) | -2.0°F (1929) | 2.10 in (1982) |
| December 3 | 69.1°F (1970) | -4.0°F (1940) | 1.30 in (1990) |
| December 4 | 72.0°F (2012) | -4.0°F (1991) | 1.13 in (1925) |
| December 5 | 72.0°F (2012) | -2.0°F (2005) | 1.91 in (1909) |
| December 6 | 66.9°F (1951) | -5.1°F (1977) | 1.11 in (1998) |
| December 7 | 66.0°F (1916) | -9.0°F (1976) | 2.01 in (1980) |
| December 8 | 68.0°F (1946) | -9.9°F (1917) | 1.28 in (1980) |
| December 9 | 66.0°F (1918) | -9.9°F (1958) | 1.00 in (1911) |
| December 10 | 59.0°F (1911) | -14.1°F (1919) | 3.75 in (2003) |
| December 11 | 66.0°F (1949) | -9.9°F (1917) | 0.92 in (1899) |
| December 12 | 66.0°F (1991) | -9.9°F (1962) | 1.55 in (1946) |
| December 13 | 64.0°F (2015) | -15.0°F (1903) | 0.70 in (1902) |
| December 14 | 61.0°F (1975) | -15.0°F (1901) | 1.96 in (1975) |
| December 15 | 62.1°F (1971) | -18.0°F (1989) | 2.12 in (1971) |
| December 16 | 73.0°F (2021) | -13.0°F (1932) | 0.40 in (1911) |
| December 17 | 59.0°F (1939) | -8.0°F (1950) | 1.66 in (1895) |
| December 18 | 64.9°F (1939) | -13.0°F (1985) | 2.05 in (1957) |
| December 19 | 59.0°F (1988) | -14.1°F (2016) | 0.80 in (1973) |
| December 20 | 62.1°F (1949) | -16.1°F (1901) | 0.71 in (1987) |
| December 21 | 60.1°F (1967) | -20.0°F (1989) | 1.29 in (2012) |
| December 22 | 60.1°F (1933) | -20.9°F (1989) | 0.70 in (1941) |
| December 23 | 64.0°F (1933) | -20.9°F (1989) | 1.35 in (1932) |
| December 24 | 61.0°F (1955) | -20.0°F (1983) | 2.15 in (1965) |
| December 25 | 64.9°F (2021) | -15.0°F (1983) | 1.20 in (2009) |
| December 26 | 63.0°F (2019) | -18.0°F (1914) | 0.73 in (1904) |
| December 27 | 63.0°F (1946) | -13.0°F (1924) | 1.84 in (1942) |
| December 28 | 68.0°F (1984) | -22.0°F (1924) | 1.45 in (2015) |
| December 29 | 66.9°F (1984) | -18.0°F (1917) | 1.34 in (1984) |
| December 30 | 64.0°F (2022) | -11.0°F (1909) | 1.38 in (1936) |
| December 31 | 60.1°F (1965) | -11.9°F (1968) | 0.85 in (1978) |