December weather in St. Johns, IL
The average temperature in St. Johns in December is 36.2°F (28.0°F–44.4°F). Average precipitation: 3.24 inches. Average snowfall is 3.6 inches.
December is a winter month in St. Johns, and is cooler than the annual average of 56°F. Daily temperatures swing about 16.4°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 9h 22m. For travel, December is cold.
Avg High
44.4°F
Avg Low
28.0°F
Precipitation
3.24 in
Snow
3.6 in
December records in St. Johns
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 70.0°F (1970) | 10.9°F (1964) | 1.51 in (1905) |
| December 2 | 75.0°F (1982) | 3.9°F (1929) | 2.40 in (1982) |
| December 3 | 73.0°F (2021) | -2.0°F (1929) | 3.71 in (1982) |
| December 4 | 71.1°F (2001) | 10.0°F (1929) | 1.56 in (1925) |
| December 5 | 70.0°F (1956) | 10.9°F (2002) | 2.08 in (1954) |
| December 6 | 71.1°F (1998) | 3.0°F (2002) | 1.25 in (2021) |
| December 7 | 73.9°F (1916) | 5.0°F (2013) | 1.24 in (1932) |
| December 8 | 70.0°F (1918) | 3.0°F (1917) | 1.60 in (1916) |
| December 9 | 69.1°F (1918) | -8.0°F (1917) | 1.54 in (1923) |
| December 10 | 71.1°F (1918) | -8.0°F (1917) | 1.90 in (1909) |
| December 11 | 73.0°F (1931) | 1.0°F (1917) | 1.20 in (1915) |
| December 12 | 71.1°F (1929) | -8.0°F (1917) | 1.45 in (1959) |
| December 13 | 72.0°F (2015) | -6.0°F (1898) | 3.33 in (1918) |
| December 14 | 71.1°F (2015) | -4.0°F (1898) | 2.25 in (1906) |
| December 15 | 73.9°F (1933) | -6.0°F (1901) | 1.40 in (1902) |
| December 16 | 68.0°F (1924) | -11.0°F (1989) | 1.94 in (2024) |
| December 17 | 75.9°F (1908) | -4.0°F (1989) | 1.84 in (2001) |
| December 18 | 66.0°F (1908) | -4.0°F (1901) | 1.23 in (2002) |
| December 19 | 64.0°F (1966) | -7.1°F (1901) | 2.10 in (1957) |
| December 20 | 66.9°F (1941) | -15.0°F (1901) | 1.90 in (1895) |
| December 21 | 69.1°F (1967) | -11.9°F (1989) | 2.95 in (2013) |
| December 22 | 66.0°F (1900) | -14.1°F (1989) | 1.40 in (1981) |
| December 23 | 69.1°F (1931) | -14.1°F (1989) | 2.00 in (1982) |
| December 24 | 68.0°F (2023) | -11.0°F (1989) | 2.86 in (1982) |
| December 25 | 72.0°F (2021) | -9.9°F (1983) | 1.65 in (1987) |
| December 26 | 73.9°F (1942) | -0.9°F (1924) | 1.35 in (1949) |
| December 27 | 75.9°F (2008) | -0.9°F (1925) | 3.46 in (1922) |
| December 28 | 72.0°F (2025) | -13.0°F (1924) | 2.23 in (2015) |
| December 29 | 70.0°F (1984) | -4.0°F (1983) | 1.82 in (1906) |
| December 30 | 69.1°F (1923) | -6.0°F (1983) | 2.36 in (1936) |
| December 31 | 75.0°F (1951) | -7.1°F (1976) | 2.03 in (1978) |