December weather in Flanagan, IL
The average temperature in Flanagan in December is 29.6°F (21.1°F–38.1°F). Average precipitation: 2.21 inches. Average snowfall is 5.5 inches.
December is a winter month in Flanagan, and is cooler than the annual average of 51.3°F. Daily temperatures swing about 17°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 9h 5m. For travel, December is cold.
Avg High
38.1°F
Avg Low
21.1°F
Precipitation
2.21 in
Snow
5.5 in
December records in Flanagan
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 64.0°F (1970) | 5.0°F (1896) | 1.22 in (2006) |
| December 2 | 68.0°F (1982) | -2.0°F (1942) | 1.20 in (1953) |
| December 3 | 70.0°F (1982) | -6.0°F (1929) | 4.38 in (1982) |
| December 4 | 71.1°F (2012) | -2.0°F (1991) | 1.30 in (1973) |
| December 5 | 70.0°F (1998) | -2.9°F (2025) | 1.00 in (1924) |
| December 6 | 66.9°F (2001) | -5.1°F (1977) | 0.53 in (2004) |
| December 7 | 66.9°F (1916) | -9.0°F (2005) | 1.79 in (1994) |
| December 8 | 64.9°F (1946) | -8.0°F (2005) | 0.68 in (1956) |
| December 9 | 68.0°F (1991) | -15.0°F (1958) | 0.85 in (2009) |
| December 10 | 63.0°F (1918) | -13.0°F (1958) | 1.65 in (1971) |
| December 11 | 63.0°F (1949) | -13.0°F (1917) | 1.18 in (1899) |
| December 12 | 59.0°F (1949) | -9.9°F (1958) | 1.32 in (1946) |
| December 13 | 66.0°F (2015) | -16.1°F (1903) | 1.55 in (1920) |
| December 14 | 62.1°F (2015) | -9.9°F (1901) | 1.54 in (2013) |
| December 15 | 62.1°F (1971) | -14.1°F (1901) | 1.64 in (2011) |
| December 16 | 64.9°F (2021) | -17.0°F (1932) | 1.02 in (1992) |
| December 17 | 61.0°F (1984) | -11.9°F (1989) | 1.10 in (1895) |
| December 18 | 60.1°F (1939) | -11.0°F (1985) | 0.69 in (1957) |
| December 19 | 57.0°F (1918) | -22.0°F (1983) | 2.05 in (1895) |
| December 20 | 61.0°F (1949) | -18.0°F (1983) | 1.41 in (1895) |
| December 21 | 60.1°F (1967) | -20.0°F (1963) | 3.49 in (1949) |
| December 22 | 57.0°F (1984) | -20.0°F (1989) | 0.53 in (1953) |
| December 23 | 60.1°F (1933) | -20.9°F (1989) | 1.06 in (1907) |
| December 24 | 62.1°F (1982) | -20.9°F (1983) | 2.33 in (1965) |
| December 25 | 61.0°F (1982) | -20.9°F (1983) | 1.60 in (1982) |
| December 26 | 64.0°F (2019) | -20.9°F (1914) | 0.38 in (1942) |
| December 27 | 64.0°F (2019) | -16.1°F (2017) | 1.53 in (1942) |
| December 28 | 63.0°F (2008) | -24.0°F (1924) | 1.10 in (1968) |
| December 29 | 68.0°F (1984) | -14.1°F (1917) | 1.80 in (2015) |
| December 30 | 61.0°F (2022) | -16.1°F (1983) | 1.73 in (1971) |
| December 31 | 61.0°F (2002) | -15.0°F (1976) | 1.08 in (2010) |